path: root/mail/em-composer-utils.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */

/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) version 3.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 *
 * Authors:
 *      Jeffrey Stedfast <fejj@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <string.h>
#include <gtk/gtk.h>

#include <libedataserver/e-data-server-util.h>
#include <glib/gi18n.h>

#include "mail-mt.h"
#include "mail-ops.h"
#include "mail-tools.h"
#include "mail-send-recv.h"

#include "e-util/e-account-utils.h"
#include "e-util/e-alert-dialog.h"
#include "e-util/e-alert-sink.h"
#include "e-util/e-util.h"

#include "shell/e-shell.h"

#include "e-mail-folder-utils.h"
#include "e-mail-local.h"
#include "e-mail-session.h"
#include "e-mail-session-utils.h"
#include "em-utils.h"
#include "em-composer-utils.h"
#include "composer/e-msg-composer.h"
#include "composer/e-composer-actions.h"
#include "composer/e-composer-post-header.h"
#include "em-folder-selector.h"
#include "em-folder-tree.h"
#include "em-format-html.h"
#include "em-format-html-print.h"
#include "em-format-quote.h"
#include "em-event.h"

#ifdef G_OS_WIN32
#ifdef gmtime_r
#undef gmtime_r
#endif

/* The gmtime() in Microsoft's C library is MT-safe */
#define gmtime_r(tp,tmp) (gmtime(tp)?(*(tmp)=*gmtime(tp),(tmp)):0)
#endif

#define GCONF_KEY_TEMPLATE_PLACEHOLDERS \
    "/apps/evolution/mail/template_placeholders"

typedef struct _AsyncContext AsyncContext;
typedef struct _ForwardData ForwardData;

struct _AsyncContext {
    CamelMimeMessage *message;
    EMsgComposer *composer;
    EActivity *activity;
    EMailReader *reader;
    GPtrArray *ptr_array;
    EMailForwardStyle style;
    gchar *folder_uri;
    gchar *message_uid;
    gboolean replace;
};

struct _ForwardData {
    EShell *shell;
    CamelFolder *folder;
    GPtrArray *uids;
    EMailForwardStyle style;
};

static void
async_context_free (AsyncContext *context)
{
    if (context->message != NULL)
        g_object_unref (context->message);

    if (context->composer != NULL)
        g_object_unref (context->composer);

    if (context->activity != NULL)
        g_object_unref (context->activity);

    if (context->reader != NULL)
        g_object_unref (context->reader);

    if (context->ptr_array != NULL)
        g_ptr_array_unref (context->ptr_array);

    g_free (context->folder_uri);
    g_free (context->message_uid);

    g_slice_free (AsyncContext, context);
}

static void
forward_data_free (ForwardData *data)
{
    if (data->shell != NULL)
        g_object_unref (data->shell);

    if (data->folder != NULL)
        g_object_unref (data->folder);

    if (data->uids != NULL)
        em_utils_uids_free (data->uids);

    g_slice_free (ForwardData, data);
}

static gboolean
ask_confirm_for_unwanted_html_mail (EMsgComposer *composer,
                                    EDestination **recipients)
{
    gboolean res;
    GString *str;
    gint i;

    str = g_string_new ("");
    for (i = 0; recipients[i] != NULL; ++i) {
        if (!e_destination_get_html_mail_pref (recipients[i])) {
            const gchar *name;

            name = e_destination_get_textrep (recipients[i], FALSE);

            g_string_append_printf (str, "     %s\n", name);
        }
    }

    if (str->len)
        res = em_utils_prompt_user (
            GTK_WINDOW (composer),
            "/apps/evolution/mail/prompts/unwanted_html",
            "mail:ask-send-html", str->str, NULL);
    else
        res = TRUE;

    g_string_free (str, TRUE);

    return res;
}

static gboolean
ask_confirm_for_empty_subject (EMsgComposer *composer)
{
    return em_utils_prompt_user (
        GTK_WINDOW (composer),
        "/apps/evolution/mail/prompts/empty_subject",
        "mail:ask-send-no-subject", NULL);
}

static gboolean
ask_confirm_for_only_bcc (EMsgComposer *composer,
                          gboolean hidden_list_case)
{
    /* If the user is mailing a hidden contact list, it is possible for
       them to create a message with only Bcc recipients without really
       realizing it.  To try to avoid being totally confusing, I've changed
       this dialog to provide slightly different text in that case, to
       better explain what the hell is going on. */

    return em_utils_prompt_user (
        GTK_WINDOW (composer),
        "/apps/evolution/mail/prompts/only_bcc",
        hidden_list_case ?
        "mail:ask-send-only-bcc-contact" :
        "mail:ask-send-only-bcc", NULL);
}

static gboolean
is_group_definition (const gchar *str)
{
    const gchar *colon;

    if (!str || !*str)
        return FALSE;

    colon = strchr (str, ':');
    return colon > str && strchr (str, ';') > colon;
}

static gboolean
composer_presend_check_recipients (EMsgComposer *composer)
{
    EDestination **recipients;
    EDestination **recipients_bcc;
    CamelInternetAddress *cia;
    EComposerHeaderTable *table;
    EComposerHeader *post_to_header;
    GString *invalid_addrs = NULL;
    gboolean check_passed = FALSE;
    gint hidden = 0;
    gint shown = 0;
    gint num = 0;
    gint num_bcc = 0;
    gint num_post = 0;
    gint ii;

    /* We should do all of the validity checks based on the composer,
     * and not on the created message, as extra interaction may occur
     * when we get the message (e.g. passphrase to sign a message). */

    table = e_msg_composer_get_header_table (composer);
    recipients = e_composer_header_table_get_destinations (table);

    cia = camel_internet_address_new ();

    /* See which ones are visible, present, etc. */
    for (ii = 0; recipients != NULL && recipients[ii] != NULL; ii++) {
        const gchar *addr;
        gint len, j;

        addr = e_destination_get_address (recipients[ii]);
        if (addr == NULL || *addr == '\0')
            continue;

        camel_address_decode (CAMEL_ADDRESS (cia), addr);
        len = camel_address_length (CAMEL_ADDRESS (cia));

        if (len > 0) {
            if (!e_destination_is_evolution_list (recipients[ii])) {
                for (j = 0; j < len; j++) {
                    const gchar *name = NULL, *eml = NULL;

                    if (!camel_internet_address_get (cia, j, &name, &eml) ||
                        !eml ||
                        strchr (eml, '@') <= eml) {
                        if (!invalid_addrs)
                            invalid_addrs = g_string_new ("");
                        else
                            g_string_append (invalid_addrs, ", ");

                        if (name)
                            g_string_append (invalid_addrs, name);
                        if (eml) {
                            g_string_append (invalid_addrs, name ? " <" : "");
                            g_string_append (invalid_addrs, eml);
                            g_string_append (invalid_addrs, name ? ">" : "");
                        }
                    }
                }
            }

            camel_address_remove (CAMEL_ADDRESS (cia), -1);
            num++;
            if (e_destination_is_evolution_list (recipients[ii])
                && !e_destination_list_show_addresses (recipients[ii])) {
                hidden++;
            } else {
                shown++;
            }
        } else if (is_group_definition (addr)) {
            /* like an address, it will not claim on only-bcc */
            shown++;
            num++;
        } else if (!invalid_addrs) {
            invalid_addrs = g_string_new (addr);
        } else {
            g_string_append (invalid_addrs, ", ");
            g_string_append (invalid_addrs, addr);
        }
    }

    recipients_bcc = e_composer_header_table_get_destinations_bcc (table);
    if (recipients_bcc) {
        for (ii = 0; recipients_bcc[ii] != NULL; ii++) {
            const gchar *addr;

            addr = e_destination_get_address (recipients_bcc[ii]);
            if (addr == NULL || *addr == '\0')
                continue;

            camel_address_decode (CAMEL_ADDRESS (cia), addr);
            if (camel_address_length (CAMEL_ADDRESS (cia)) > 0) {
                camel_address_remove (CAMEL_ADDRESS (cia), -1);
                num_bcc++;
            }
        }

        e_destination_freev (recipients_bcc);
    }

    g_object_unref (cia);

    post_to_header = e_composer_header_table_get_header (
        table, E_COMPOSER_HEADER_POST_TO);
    if (e_composer_header_get_visible (post_to_header)) {
        GList *postlist;

        postlist = e_composer_header_table_get_post_to (table);
        num_post = g_list_length (postlist);
        g_list_foreach (postlist, (GFunc) g_free, NULL);
        g_list_free (postlist);
    }

    /* I'm sensing a lack of love, er, I mean recipients. */
    if (num == 0 && num_post == 0) {
        e_alert_submit (
            E_ALERT_SINK (composer),
            "mail:send-no-recipients", NULL);
        goto finished;
    }

    if (invalid_addrs) {
        if (!em_utils_prompt_user (
            GTK_WINDOW (composer),
            "/apps/evolution/mail/prompts/send_invalid_recip",
            strstr (invalid_addrs->str, ", ") ?
                "mail:ask-send-invalid-recip-multi" :
                "mail:ask-send-invalid-recip-one",
            invalid_addrs->str, NULL)) {
            g_string_free (invalid_addrs, TRUE);
            goto finished;
        }

        g_string_free (invalid_addrs, TRUE);
    }

    if (num > 0 && (num == num_bcc || shown == 0)) {
        /* this means that the only recipients are Bcc's */
        if (!ask_confirm_for_only_bcc (composer, shown == 0))
            goto finished;
    }

    check_passed = TRUE;

finished:
    if (recipients != NULL)
        e_destination_freev (recipients);

    return check_passed;
}

static gboolean
composer_presend_check_account (EMsgComposer *composer)
{
    EComposerHeaderTable *table;
    EAccount *account;
    gboolean check_passed;

    table = e_msg_composer_get_header_table (composer);
    account = e_composer_header_table_get_account (table);
    check_passed = (account != NULL && account->enabled);

    if (!check_passed)
        e_alert_submit (
            E_ALERT_SINK (composer),
            "mail:send-no-account-enabled", NULL);

    return check_passed;
}

static gboolean
composer_presend_check_downloads (EMsgComposer *composer)
{
    EAttachmentView *view;
    EAttachmentStore *store;
    gboolean check_passed = TRUE;

    view = e_msg_composer_get_attachment_view (composer);
    store = e_attachment_view_get_store (view);

    if (e_attachment_store_get_num_loading (store) > 0) {
        if (!em_utils_prompt_user (GTK_WINDOW (composer), NULL,
            "mail-composer:ask-send-message-pending-download", NULL))
            check_passed = FALSE;
    }

    return check_passed;
}

static gboolean
composer_presend_check_plugins (EMsgComposer *composer)
{
    EMEvent *eme;
    EMEventTargetComposer *target;
    gpointer data;

    /** @Event: composer.presendchecks
     * @Title: Composer PreSend Checks
     * @Target: EMEventTargetMessage
     *
     * composer.presendchecks is emitted during pre-checks for the
     * message just before sending.  Since the e-plugin framework
     * doesn't provide a way to return a value from the plugin,
     * use 'presend_check_status' to set whether the check passed.
     */
    eme = em_event_peek ();
    target = em_event_target_new_composer (eme, composer, 0);

    e_event_emit (
        (EEvent *) eme, "composer.presendchecks",
        (EEventTarget *) target);

    /* A non-NULL value for this key means the check failed. */
    data = g_object_get_data (G_OBJECT (composer), "presend_check_status");

    /* Clear the value in case we have to run these checks again. */
    g_object_set_data (G_OBJECT (composer), "presend_check_status", NULL);

    return (data == NULL);
}

static gboolean
composer_presend_check_subject (EMsgComposer *composer)
{
    EComposerHeaderTable *table;
    const gchar *subject;
    gboolean check_passed = TRUE;

    table = e_msg_composer_get_header_table (composer);
    subject = e_composer_header_table_get_subject (table);

    if (subject == NULL || subject[0] == '\0') {
        if (!ask_confirm_for_empty_subject (composer))
            check_passed = FALSE;
    }

    return check_passed;
}

static gboolean
composer_presend_check_unwanted_html (EMsgComposer *composer)
{
    EDestination **recipients;
    EComposerHeaderTable *table;
    GConfClient *client;
    gboolean check_passed = TRUE;
    gboolean html_mode;
    gboolean send_html;
    gboolean confirm_html;
    gint ii;

    client = gconf_client_get_default ();

    table = e_msg_composer_get_header_table (composer);
    recipients = e_composer_header_table_get_destinations (table);
    html_mode = gtkhtml_editor_get_html_mode (GTKHTML_EDITOR (composer));

    send_html = gconf_client_get_bool (
        client, "/apps/evolution/mail/composer/send_html", NULL);
    confirm_html = gconf_client_get_bool (
        client, "/apps/evolution/mail/prompts/unwanted_html", NULL);

    /* Only show this warning if our default is to send html.  If it
     * isn't, we've manually switched into html mode in the composer
     * and (presumably) had a good reason for doing this. */
    if (html_mode && send_html && confirm_html && recipients != NULL) {
        gboolean html_problem = FALSE;

        for (ii = 0; recipients[ii] != NULL; ii++) {
            if (!e_destination_get_html_mail_pref (recipients[ii]))
                html_problem = TRUE;
                break;
        }

        if (html_problem) {
            if (!ask_confirm_for_unwanted_html_mail (
                composer, recipients))
                check_passed = FALSE;
        }
    }

    if (recipients != NULL)
        e_destination_freev (recipients);

    g_object_unref (client);

    return check_passed;
}

static void
composer_send_completed (EMailSession *session,
                         GAsyncResult *result,
                         AsyncContext *context)
{
    GError *error = NULL;

    e_mail_session_send_to_finish (session, result, &error);

    if (e_activity_handle_cancellation (context->activity, error)) {
        g_error_free (error);
        goto exit;
    }

    /* Post-processing errors are shown in the shell window. */
    if (g_error_matches (error, E_MAIL_ERROR, E_MAIL_ERROR_POST_PROCESSING)) {
        EAlert *alert;
        EShell *shell;

        shell = e_msg_composer_get_shell (context->composer);

        alert = e_alert_new (
            "mail-composer:send-post-processing-error",
            error->message, NULL);
        e_shell_submit_alert (shell, alert);
        g_object_unref (alert);

    /* All other errors are shown in the composer window. */
    } else if (error != NULL) {
        gint response;

        /* Clear the activity bar before
         * presenting the error dialog. */
        g_object_unref (context->activity);
        context->activity = NULL;

        response = e_alert_run_dialog_for_args (
            GTK_WINDOW (context->composer),
            "mail-composer:send-error",
            error->message, NULL);
        if (response == GTK_RESPONSE_OK)  /* Try Again */
            e_msg_composer_send (context->composer);
        if (response == GTK_RESPONSE_ACCEPT)  /* Save to Outbox */
            e_msg_composer_save_to_outbox (context->composer);
        g_error_free (error);
        goto exit;
    }

    e_activity_set_state (context->activity, E_ACTIVITY_COMPLETED);

    /* Wait for the EActivity's completion message to
     * time out and then destroy the composer window. */
    g_object_weak_ref (
        G_OBJECT (context->activity), (GWeakNotify)
        gtk_widget_destroy, context->composer);

exit:
    async_context_free (context);
}

static void
em_utils_composer_send_cb (EMsgComposer *composer,
                           CamelMimeMessage *message,
                           EActivity *activity)
{
    AsyncContext *context;
    CamelSession *session;
    GCancellable *cancellable;

    context = g_slice_new0 (AsyncContext);
    context->message = g_object_ref (message);
    context->composer = g_object_ref (composer);
    context->activity = g_object_ref (activity);

    cancellable = e_activity_get_cancellable (activity);
    session = e_msg_composer_get_session (context->composer);

    e_mail_session_send_to (
        E_MAIL_SESSION (session), message,
        G_PRIORITY_DEFAULT, cancellable, NULL, NULL,
        (GAsyncReadyCallback) composer_send_completed,
        context);
}

static void
composer_set_no_change (EMsgComposer *composer)
{
    GtkhtmlEditor *editor;

    g_return_if_fail (composer != NULL);

    editor = GTKHTML_EDITOR (composer);

    gtkhtml_editor_drop_undo (editor);
    gtkhtml_editor_set_changed (editor, FALSE);
}

/* delete original messages from Outbox folder */
static void
manage_x_evolution_replace_outbox (EMsgComposer *composer, CamelMimeMessage *message, GCancellable *cancellable)
{
    const gchar *message_uid;
    CamelFolder *outbox;

    g_return_if_fail (composer != NULL);
    g_return_if_fail (message != NULL);
    g_return_if_fail (CAMEL_IS_MIME_MESSAGE (message));

    message_uid = camel_medium_get_header (CAMEL_MEDIUM (message), "X-Evolution-Replace-Outbox-UID");
    e_msg_composer_remove_header (composer, "X-Evolution-Replace-Outbox-UID");

    if (!message_uid)
        return;

    outbox = e_mail_local_get_folder (E_MAIL_LOCAL_FOLDER_OUTBOX);
    g_return_if_fail (outbox != NULL);

    camel_folder_set_message_flags (
        outbox, message_uid,
        CAMEL_MESSAGE_DELETED | CAMEL_MESSAGE_SEEN,
        CAMEL_MESSAGE_DELETED | CAMEL_MESSAGE_SEEN);

    /* ignore errors here */
    camel_folder_synchronize_message_sync (outbox, message_uid, cancellable, NULL);
}

static void
composer_save_to_drafts_complete (EMailSession *session,
                                  GAsyncResult *result,
                                  AsyncContext *context)
{
    GError *error = NULL;

    /* We don't really care if this failed.  If something other than
     * cancellation happened, emit a runtime warning so the error is
     * not completely lost. */

    e_mail_session_handle_draft_headers_finish (session, result, &error);

    if (e_activity_handle_cancellation (context->activity, error)) {
        g_error_free (error);

    } else if (error != NULL) {
        g_warning ("%s", error->message);
        g_error_free (error);

    } else
        e_activity_set_state (context->activity, E_ACTIVITY_COMPLETED);

    /* Encode the draft message we just saved into the EMsgComposer
     * as X-Evolution-Draft headers.  The message will be marked for
     * deletion if the user saves a newer draft message or sends the
     * composed message. */
    e_msg_composer_set_draft_headers (
        context->composer, context->folder_uri,
        context->message_uid);

    async_context_free (context);
}

static void
composer_save_to_drafts_cleanup (CamelFolder *drafts_folder,
                                 GAsyncResult *result,
                                 AsyncContext *context)
{
    CamelSession *session;
    EAlertSink *alert_sink;
    GCancellable *cancellable;
    GError *error = NULL;

    session = e_msg_composer_get_session (context->composer);
    alert_sink = e_activity_get_alert_sink (context->activity);
    cancellable = e_activity_get_cancellable (context->activity);

    e_mail_folder_append_message_finish (
        drafts_folder, result, &context->message_uid, &error);

    if (e_activity_handle_cancellation (context->activity, error)) {
        g_warn_if_fail (context->message_uid == NULL);
        async_context_free (context);
        g_error_free (error);
        return;

    } else if (error != NULL) {
        g_warn_if_fail (context->message_uid == NULL);
        e_alert_submit (
            alert_sink,
            "mail-composer:save-to-drafts-error",
            error->message, NULL);
        async_context_free (context);
        g_error_free (error);
        return;
    }

    /* Mark the previously saved draft message for deletion.
     * Note: This is just a nice-to-have; ignore failures. */
    e_mail_session_handle_draft_headers (
        E_MAIL_SESSION (session), context->message,
        G_PRIORITY_DEFAULT, cancellable, (GAsyncReadyCallback)
        composer_save_to_drafts_complete, context);
}

static void
composer_save_to_drafts_append_mail (AsyncContext *context,
                                     CamelFolder *drafts_folder)
{
    CamelFolder *local_drafts_folder;
    GCancellable *cancellable;
    CamelMessageInfo *info;

    local_drafts_folder =
        e_mail_local_get_folder (E_MAIL_LOCAL_FOLDER_DRAFTS);

    if (drafts_folder == NULL)
        drafts_folder = g_object_ref (local_drafts_folder);

    cancellable = e_activity_get_cancellable (context->activity);

    info = camel_message_info_new (NULL);

    camel_message_info_set_flags (
        info, CAMEL_MESSAGE_DRAFT | CAMEL_MESSAGE_SEEN, ~0);

    camel_medium_remove_header (CAMEL_MEDIUM (context->message), "X-Evolution-Replace-Outbox-UID");

    e_mail_folder_append_message (
        drafts_folder, context->message,
        info, G_PRIORITY_DEFAULT, cancellable,
        (GAsyncReadyCallback) composer_save_to_drafts_cleanup,
        context);

    camel_message_info_free (info);

    g_object_unref (drafts_folder);
}

static void
composer_save_to_drafts_got_folder (EMailSession *session,
                                    GAsyncResult *result,
                                    AsyncContext *context)
{
    CamelFolder *drafts_folder;
    GError *error = NULL;

    drafts_folder = e_mail_session_uri_to_folder_finish (
        session, result, &error);

    if (e_activity_handle_cancellation (context->activity, error)) {
        g_warn_if_fail (drafts_folder == NULL);
        async_context_free (context);
        g_error_free (error);
        return;

    } else if (error != NULL) {
        gint response;

        g_warn_if_fail (drafts_folder == NULL);

        /* XXX Not showing the error message in the dialog? */
        g_error_free (error);

        /* If we can't retrieve the Drafts folder for the
         * selected account, ask the user if he wants to
         * save to the local Drafts folder instead. */
        response = e_alert_run_dialog_for_args (
            GTK_WINDOW (context->composer),
            "mail:ask-default-drafts", NULL);
        if (response != GTK_RESPONSE_YES) {
            async_context_free (context);
            return;
        }
    }

    composer_save_to_drafts_append_mail (context, drafts_folder);
}

static void
em_utils_composer_save_to_drafts_cb (EMsgComposer *composer,
                                     CamelMimeMessage *message,
                                     EActivity *activity)
{
    AsyncContext *context;
    EComposerHeaderTable *table;
    const gchar *drafts_folder_uri = NULL;
    const gchar *local_drafts_folder_uri;
    CamelSession *session;
    EAccount *account;

    context = g_slice_new0 (AsyncContext);
    context->message = g_object_ref (message);
    context->composer = g_object_ref (composer);
    context->activity = g_object_ref (activity);

    session = e_msg_composer_get_session (composer);

    local_drafts_folder_uri =
        e_mail_local_get_folder_uri (E_MAIL_LOCAL_FOLDER_DRAFTS);

    table = e_msg_composer_get_header_table (composer);
    account = e_composer_header_table_get_account (table);

    if (account != NULL && account->enabled)
        drafts_folder_uri = account->drafts_folder_uri;

    if (g_strcmp0 (drafts_folder_uri, local_drafts_folder_uri) == 0)
        drafts_folder_uri = NULL;

    if (drafts_folder_uri == NULL) {
        composer_save_to_drafts_append_mail (context, NULL);
        context->folder_uri = g_strdup (local_drafts_folder_uri);
    } else {
        GCancellable *cancellable;

        cancellable = e_activity_get_cancellable (activity);
        context->folder_uri = g_strdup (drafts_folder_uri);

        e_mail_session_uri_to_folder (
            E_MAIL_SESSION (session),
            drafts_folder_uri, 0, G_PRIORITY_DEFAULT,
            cancellable, (GAsyncReadyCallback)
            composer_save_to_drafts_got_folder, context);
    }
}

static void
composer_save_to_outbox_completed (CamelFolder *outbox_folder,
                                   GAsyncResult *result,
                                   AsyncContext *context)
{
    EAlertSink *alert_sink;
    GError *error = NULL;

    alert_sink = e_activity_get_alert_sink (context->activity);

    e_mail_folder_append_message_finish (
        outbox_folder, result, NULL, &error);

    if (e_activity_handle_cancellation (context->activity, error)) {
        g_error_free (error);
        goto exit;

    } else if (error != NULL) {
        e_alert_submit (
            alert_sink,
            "mail-composer:append-to-outbox-error",
            error->message, NULL);
        g_error_free (error);
        goto exit;
    }

    /* special processing for Outbox folder */
    manage_x_evolution_replace_outbox (context->composer, context->message, e_activity_get_cancellable (context->activity));

    e_activity_set_state (context->activity, E_ACTIVITY_COMPLETED);

    /* Wait for the EActivity's completion message to
     * time out and then destroy the composer window. */
    g_object_weak_ref (
        G_OBJECT (context->activity), (GWeakNotify)
        gtk_widget_destroy, context->composer);

exit:
    async_context_free (context);
}

static void
em_utils_composer_save_to_outbox_cb (EMsgComposer *composer,
                                     CamelMimeMessage *message,
                                     EActivity *activity)
{
    AsyncContext *context;
    CamelFolder *outbox_folder;
    CamelMessageInfo *info;
    GCancellable *cancellable;

    context = g_slice_new0 (AsyncContext);
    context->message = g_object_ref (message);
    context->composer = g_object_ref (composer);
    context->activity = g_object_ref (activity);

    cancellable = e_activity_get_cancellable (activity);
    outbox_folder = e_mail_local_get_folder (E_MAIL_LOCAL_FOLDER_OUTBOX);

    info = camel_message_info_new (NULL);
    camel_message_info_set_flags (info, CAMEL_MESSAGE_SEEN, ~0);

    e_mail_folder_append_message (
        outbox_folder, message, info,
        G_PRIORITY_DEFAULT, cancellable,
        (GAsyncReadyCallback) composer_save_to_outbox_completed,
        context);

    camel_message_info_free (info);
}

static void
em_utils_composer_print_cb (EMsgComposer *composer,
                            GtkPrintOperationAction action,
                            CamelMimeMessage *message,
                            EActivity *activity)
{
    EMFormatHTMLPrint *efhp;

    efhp = em_format_html_print_new (NULL, action);
    em_format_html_print_message (efhp, message, NULL, NULL);
    g_object_unref (efhp);
}

/* Composing messages... */

static EMsgComposer *
create_new_composer (EShell *shell,
                     const gchar *subject,
                     CamelFolder *folder)
{
    EMsgComposer *composer;
    EComposerHeaderTable *table;
    EAccount *account = NULL;

    composer = e_msg_composer_new (shell);

    table = e_msg_composer_get_header_table (composer);

    if (folder != NULL) {
        CamelStore *store;
        const gchar *uid;
        gchar *folder_uri;
        GList *list;

        store = camel_folder_get_parent_store (folder);
        uid = camel_service_get_uid (CAMEL_SERVICE (store));
        account = e_get_account_by_uid (uid);

        folder_uri = e_mail_folder_uri_from_folder (folder);

        list = g_list_prepend (NULL, folder_uri);
        e_composer_header_table_set_post_to_list (table, list);
        g_list_free (list);

        g_free (folder_uri);
    }

    e_composer_header_table_set_account (table, account);
    e_composer_header_table_set_subject (table, subject);

    return composer;
}

/**
 * em_utils_compose_new_message:
 * @shell: an #EShell
 * @folder: a #CamelFolder, or %NULL
 *
 * Opens a new composer window as a child window of @parent's toplevel
 * window.
 **/
void
em_utils_compose_new_message (EShell *shell,
                              CamelFolder *folder)
{
    EMsgComposer *composer;

    g_return_if_fail (E_IS_SHELL (shell));

    if (folder != NULL)
        g_return_if_fail (CAMEL_IS_FOLDER (folder));

    composer = create_new_composer (shell, "", folder);
    composer_set_no_change (composer);

    gtk_widget_show (GTK_WIDGET (composer));
}

/**
 * em_utils_compose_new_message_with_mailto:
 * @shell: an #EShell
 * @mailto: a mailto URL
 * @folder: a #CamelFolder, or %NULL
 *
 * Opens a new composer window as a child window of @parent's toplevel
 * window. If @mailto is non-NULL, the composer fields will be filled in
 * according to the values in the mailto URL.
 **/
EMsgComposer *
em_utils_compose_new_message_with_mailto (EShell *shell,
                                          const gchar *mailto,
                                          CamelFolder *folder)
{
    EMsgComposer *composer;
    EComposerHeaderTable *table;
    EAccount *account = NULL;

    g_return_val_if_fail (E_IS_SHELL (shell), NULL);

    if (folder != NULL)
        g_return_val_if_fail (CAMEL_IS_FOLDER (folder), NULL);

    if (mailto != NULL)
        composer = e_msg_composer_new_from_url (shell, mailto);
    else
        composer = e_msg_composer_new (shell);

    table = e_msg_composer_get_header_table (composer);

    if (folder != NULL) {
        CamelStore *store;
        const gchar *uid;

        store = camel_folder_get_parent_store (folder);
        uid = camel_service_get_uid (CAMEL_SERVICE (store));
        account = e_get_account_by_uid (uid);
    }

    if (account != NULL)
        e_composer_header_table_set_account_name (table, account->name);

    composer_set_no_change (composer);

    gtk_window_present (GTK_WINDOW (composer));

    return composer;
}

static gboolean
replace_variables (GSList *clues, CamelMimeMessage *message, gchar **pstr)
{
    gint i;
    gboolean string_changed = FALSE, count1 = FALSE;
    gchar *str;

    g_return_val_if_fail (pstr != NULL, FALSE);
    g_return_val_if_fail (*pstr != NULL, FALSE);
    g_return_val_if_fail (message != NULL, FALSE);

    str = *pstr;

    for (i = 0; i < strlen (str); i++) {
        const gchar *cur = str + i;
        if (!g_ascii_strncasecmp (cur, "$", 1)) {
            const gchar *end = cur + 1;
            gchar *out;
            gchar **temp_str;
            GSList *list;

            while (*end && (g_unichar_isalnum (*end) || *end == '_'))
                end++;

            out = g_strndup ((const gchar *) cur, end - cur);

            temp_str = g_strsplit (str, out, 2);

            for (list = clues; list; list = g_slist_next (list)) {
                gchar **temp = g_strsplit (list->data, "=", 2);
                if (!g_ascii_strcasecmp (temp[0], out+1)) {
                    g_free (str);
                    str = g_strconcat (temp_str[0], temp[1], temp_str[1], NULL);
                    count1 = TRUE;
                    string_changed = TRUE;
                } else
                    count1 = FALSE;
                g_strfreev (temp);
            }

            if (!count1) {
                if (getenv (out+1)) {
                    g_free (str);
                    str = g_strconcat (temp_str[0], getenv (out + 1), temp_str[1], NULL);
                    count1 = TRUE;
                    string_changed = TRUE;
                } else
                    count1 = FALSE;
            }

            if (!count1) {
                CamelInternetAddress *to;
                const gchar *name, *addr;

                to = camel_mime_message_get_recipients (message, CAMEL_RECIPIENT_TYPE_TO);
                if (!camel_internet_address_get (to, 0, &name, &addr))
                    continue;

                if (name && g_ascii_strcasecmp ("sender_name", out + 1) == 0) {
                    g_free (str);
                    str = g_strconcat (temp_str[0], name, temp_str[1], NULL);
                    count1 = TRUE;
                    string_changed = TRUE;
                } else if (addr && g_ascii_strcasecmp ("sender_email", out + 1) == 0) {
                    g_free (str);
                    str = g_strconcat (temp_str[0], addr, temp_str[1], NULL);
                    count1 = TRUE;
                    string_changed = TRUE;
                }
            }

            g_strfreev (temp_str);
            g_free (out);
        }
    }

    *pstr = str;

    return string_changed;
}

static void
traverse_parts (GSList *clues, CamelMimeMessage *message, CamelDataWrapper *content)
{
    g_return_if_fail (message != NULL);

    if (!content)
        return;

    if (CAMEL_IS_MULTIPART (content)) {
        guint i, n;
        CamelMultipart *multipart = CAMEL_MULTIPART (content);
        CamelMimePart *part;

        n = camel_multipart_get_number (multipart);
        for (i = 0; i < n; i++) {
            part = camel_multipart_get_part (multipart, i);
            if (!part)
                continue;

            traverse_parts (clues, message, CAMEL_DATA_WRAPPER (part));
        }
    } else if (CAMEL_IS_MIME_PART (content)) {
        CamelMimePart *part = CAMEL_MIME_PART (content);
        CamelContentType *type;
        CamelStream *stream;
        GByteArray *byte_array;
        gchar *str;

        content = camel_medium_get_content (CAMEL_MEDIUM (part));
        if (!content)
            return;

        if (CAMEL_IS_MULTIPART (content)) {
            traverse_parts (clues, message, CAMEL_DATA_WRAPPER (content));
            return;
        }

        type = camel_mime_part_get_content_type (part);
        if (!camel_content_type_is (type, "text", "*"))
            return;

        byte_array = g_byte_array_new ();
        stream = camel_stream_mem_new_with_byte_array (byte_array);
        camel_data_wrapper_decode_to_stream_sync (
            content, stream, NULL, NULL);

        str = g_strndup ((gchar *) byte_array->data, byte_array->len);
        g_object_unref (stream);

        if (replace_variables (clues, message, &str)) {
            stream = camel_stream_mem_new_with_buffer (str, strlen (str));
            camel_stream_reset (stream, NULL);
            camel_data_wrapper_construct_from_stream_sync (
                content, stream, NULL, NULL);
            g_object_unref (stream);
        }

        g_free (str);
    }
}

/* Editing messages... */

typedef enum {
    QUOTING_ATTRIBUTION,
    QUOTING_FORWARD,
    QUOTING_ORIGINAL
} QuotingTextEnum;

static struct {
    const gchar * gconf_key;
    const gchar * message;
} conf_messages[] = {
    [QUOTING_ATTRIBUTION] =
        { "/apps/evolution/mail/composer/message_attribution",
        /* Note to translators: this is the attribution string used
         * when quoting messages.  Each ${Variable} gets replaced
         * with a value.  To see a full list of available variables,
         * see mail/em-composer-utils.c:attribvars array. */
          N_("On ${AbbrevWeekdayName}, ${Year}-${Month}-${Day} at "
             "${24Hour}:${Minute} ${TimeZone}, ${Sender} wrote:") 
        },

    [QUOTING_FORWARD] =
        { "/apps/evolution/mail/composer/message_forward",
          N_("-------- Forwarded Message --------")
        },

    [QUOTING_ORIGINAL] =
        { "/apps/evolution/mail/composer/message_original",
          N_("-----Original Message-----")
        }
};

static gchar *
quoting_text (QuotingTextEnum type)
{
    GConfClient *client;
    gchar *text;

    client = gconf_client_get_default ();
    text = gconf_client_get_string (client, conf_messages[type].gconf_key, NULL);
    g_object_unref (client);

    if (text && *text)
        return text;

    g_free (text);

    return g_strdup (_(conf_messages[type].message));
}

/**
 * em_utils_edit_message:
 * @shell: an #EShell
 * @folder: a #CamelFolder
 * @message: a #CamelMimeMessage
 * @message_uid: UID of @message, or %NULL
 *
 * Opens a composer filled in with the headers/mime-parts/etc of
 * @message.
 **/
GtkWidget *
em_utils_edit_message (EShell *shell,
                       CamelFolder *folder,
                       CamelMimeMessage *message,
                       const gchar *message_uid)
{
    EMsgComposer *composer;

    g_return_val_if_fail (E_IS_SHELL (shell), NULL);
    g_return_val_if_fail (CAMEL_IS_FOLDER (folder), NULL);
    g_return_val_if_fail (CAMEL_IS_MIME_MESSAGE (message), NULL);

    /* Template specific code follows. */
    if (em_utils_folder_is_templates (folder)) {
        CamelDataWrapper *content;
        GConfClient *gconf;
        GSList *clue_list = NULL;

        gconf = gconf_client_get_default ();
        /* Get the list from gconf */
        clue_list = gconf_client_get_list (
            gconf, GCONF_KEY_TEMPLATE_PLACEHOLDERS,
            GCONF_VALUE_STRING, NULL );
        g_object_unref (gconf);

        content = camel_medium_get_content (CAMEL_MEDIUM (message));
        traverse_parts (clue_list, message, content);

        g_slist_foreach (clue_list, (GFunc) g_free, NULL);
        g_slist_free (clue_list);
    }

    composer = e_msg_composer_new_with_message (shell, message, NULL);

    e_msg_composer_remove_header (composer, "X-Evolution-Replace-Outbox-UID");

    if (message_uid != NULL && em_utils_folder_is_drafts (folder)) {
        gchar *folder_uri;

        folder_uri = e_mail_folder_uri_from_folder (folder);

        e_msg_composer_set_draft_headers (
            composer, folder_uri, message_uid);

        g_free (folder_uri);
    } else if (message_uid != NULL && em_utils_folder_is_outbox (folder)) {
        e_msg_composer_set_header (composer, "X-Evolution-Replace-Outbox-UID", message_uid);
    }

    composer_set_no_change (composer);

    gtk_widget_show (GTK_WIDGET (composer));

    return GTK_WIDGET (composer);
}

static void
edit_messages_cb (CamelFolder *folder,
                  GAsyncResult *result,
                  AsyncContext *context)
{
    EShell *shell;
    EMailBackend *backend;
    EAlertSink *alert_sink;
    GHashTable *hash_table;
    GHashTableIter iter;
    gpointer key, value;
    GError *error = NULL;

    alert_sink = e_mail_reader_get_alert_sink (context->reader);

    hash_table = e_mail_folder_get_multiple_messages_finish (
        folder, result, &error);

    if (e_activity_handle_cancellation (context->activity, error)) {
        g_warn_if_fail (hash_table == NULL);
        async_context_free (context);
        g_error_free (error);
        return;

    } else if (error != NULL) {
        g_warn_if_fail (hash_table == NULL);
        e_alert_submit (
            alert_sink,
            "mail:get-multiple-messages",
            error->message, NULL);
        async_context_free (context);
        g_error_free (error);
        return;
    }

    g_return_if_fail (hash_table != NULL);

    backend = e_mail_reader_get_backend (context->reader);
    shell = e_shell_backend_get_shell (E_SHELL_BACKEND (backend));

    /* Open each message in its own composer window. */

    g_hash_table_iter_init (&iter, hash_table);

    while (g_hash_table_iter_next (&iter, &key, &value)) {
        CamelMimeMessage *message;

        if (!context->replace)
            key = NULL;

        message = CAMEL_MIME_MESSAGE (value);
        camel_medium_remove_header (CAMEL_MEDIUM (value), "X-Mailer");
        em_utils_edit_message (shell, folder, message, key);
    }

    g_hash_table_unref (hash_table);

    e_activity_set_state (context->activity, E_ACTIVITY_COMPLETED);

    async_context_free (context);
}

/**
 * em_utils_edit_messages:
 * @reader: an #EMailReader
 * @folder: folder containing messages to edit
 * @uids: uids of messages to edit
 * @replace: replace the existing message(s) when sent or saved.
 *
 * Opens a composer for each message to be edited.
 **/
void
em_utils_edit_messages (EMailReader *reader,
                        CamelFolder *folder,
                        GPtrArray *uids,
                        gboolean replace)
{
    EActivity *activity;
    AsyncContext *context;
    GCancellable *cancellable;

    g_return_if_fail (E_IS_MAIL_READER (reader));
    g_return_if_fail (CAMEL_IS_FOLDER (folder));
    g_return_if_fail (uids != NULL);

    activity = e_mail_reader_new_activity (reader);
    cancellable = e_activity_get_cancellable (activity);

    context = g_slice_new0 (AsyncContext);
    context->activity = activity;
    context->reader = g_object_ref (reader);
    context->ptr_array = g_ptr_array_ref (uids);
    context->replace = replace;

    e_mail_folder_get_multiple_messages (
        folder, uids, G_PRIORITY_DEFAULT,
        cancellable, (GAsyncReadyCallback)
        edit_messages_cb, context);
}

static void
emu_update_composers_security (EMsgComposer *composer, guint32 validity_found)
{
    GtkToggleAction *action;

    g_return_if_fail (composer != NULL);

    /* Pre-set only for encrypted messages, not for signed */
    /*if (validity_found & EM_FORMAT_VALIDITY_FOUND_SIGNED) {
        if (validity_found & EM_FORMAT_VALIDITY_FOUND_SMIME)
            action = GTK_TOGGLE_ACTION (E_COMPOSER_ACTION_SMIME_SIGN (composer));
        else
            action = GTK_TOGGLE_ACTION (E_COMPOSER_ACTION_PGP_SIGN (composer));
        gtk_toggle_action_set_active (action, TRUE);
    }*/

    if (validity_found & EM_FORMAT_VALIDITY_FOUND_ENCRYPTED) {
        if (validity_found & EM_FORMAT_VALIDITY_FOUND_SMIME)
            action = GTK_TOGGLE_ACTION (E_COMPOSER_ACTION_SMIME_ENCRYPT (composer));
        else
            action = GTK_TOGGLE_ACTION (E_COMPOSER_ACTION_PGP_ENCRYPT (composer));
        gtk_toggle_action_set_active (action, TRUE);
    }
}

static void
real_update_forwarded_flag (gpointer uid, gpointer folder)
{
    if (uid && folder)
        camel_folder_set_message_flags (
            folder, uid, CAMEL_MESSAGE_FORWARDED,
            CAMEL_MESSAGE_FORWARDED);
}

static void
update_forwarded_flags_cb (EMsgComposer *composer,
                           ForwardData *data)
{
    if (data && data->uids && data->folder)
        g_ptr_array_foreach (
            data->uids, real_update_forwarded_flag, data->folder);
}

static void
setup_forward_attached_callbacks (EMsgComposer *composer,
                                  CamelFolder *folder,
                                  GPtrArray *uids)
{
    ForwardData *data;

    if (!composer || !folder || !uids || !uids->len)
        return;

    g_object_ref (folder);

    data = g_slice_new0 (ForwardData);
    data->folder = g_object_ref (folder);
    data->uids = em_utils_uids_copy (uids);

    g_signal_connect (
        composer, "send",
        G_CALLBACK (update_forwarded_flags_cb), data);
    g_signal_connect (
        composer, "save-to-drafts",
        G_CALLBACK (update_forwarded_flags_cb), data);

    g_object_set_data_full (
        G_OBJECT (composer), "forward-data", data,
        (GDestroyNotify) forward_data_free);
}

static EMsgComposer *
forward_attached (EShell *shell,
                  CamelFolder *folder,
                  GPtrArray *uids,
                  CamelMimePart *part,
                  gchar *subject)
{
    EMsgComposer *composer;

    composer = create_new_composer (shell, subject, folder);

    e_msg_composer_attach (composer, part);

    if (uids)
        setup_forward_attached_callbacks (composer, folder, uids);

    composer_set_no_change (composer);

    gtk_widget_show (GTK_WIDGET (composer));

    return composer;
}

static void
forward_attached_cb (CamelFolder *folder,
                     GAsyncResult *result,
                     AsyncContext *context)
{
    EShell *shell;
    EMailBackend *backend;
    EAlertSink *alert_sink;
    CamelMimePart *part;
    gchar *subject = NULL;
    GError *error = NULL;

    alert_sink = e_mail_reader_get_alert_sink (context->reader);

    part = e_mail_folder_build_attachment_finish (
        folder, result, &subject, &error);

    if (e_activity_handle_cancellation (context->activity, error)) {
        g_warn_if_fail (part == NULL);
        g_warn_if_fail (subject == NULL);
        async_context_free (context);
        g_error_free (error);
        return;

    } else if (error != NULL) {
        g_warn_if_fail (part == NULL);
        g_warn_if_fail (subject == NULL);
        e_alert_submit (
            alert_sink,
            "mail:get-multiple-messages",
            error->message, NULL);
        async_context_free (context);
        g_error_free (error);
        return;
    }

    g_return_if_fail (CAMEL_IS_MIME_PART (part));

    backend = e_mail_reader_get_backend (context->reader);
    shell = e_shell_backend_get_shell (E_SHELL_BACKEND (backend));

    forward_attached (shell, folder, context->ptr_array, part, subject);

    e_activity_set_state (context->activity, E_ACTIVITY_COMPLETED);

    g_object_unref (part);
    g_free (subject);

    async_context_free (context);
}

static EMsgComposer *
forward_non_attached (EShell *shell,
                      CamelFolder *folder,
                      const gchar *uid,
                      CamelMimeMessage *message,
                      EMailForwardStyle style)
{
    EMsgComposer *composer = NULL;
    gchar *text, *forward;
    guint32 validity_found = 0;
    guint32 flags;

    flags = EM_FORMAT_QUOTE_HEADERS | EM_FORMAT_QUOTE_KEEP_SIG;
    if (style == E_MAIL_FORWARD_STYLE_QUOTED)
        flags |= EM_FORMAT_QUOTE_CITE;

    forward = quoting_text (QUOTING_FORWARD);
    text = em_utils_message_to_html (
        message, forward, flags, NULL, NULL, &validity_found);

    if (text != NULL) {
        CamelDataWrapper *content;
        gchar *subject;

        subject = mail_tool_generate_forward_subject (message);
        composer = create_new_composer (shell, subject, folder);
        g_free (subject);

        content = camel_medium_get_content (CAMEL_MEDIUM (message));

        if (CAMEL_IS_MULTIPART (content))
            e_msg_composer_add_message_attachments (
                composer, message, FALSE);

        e_msg_composer_set_body_text (composer, text, TRUE);

        if (uid != NULL) {
            gchar *folder_uri;

            folder_uri = e_mail_folder_uri_from_folder (folder);

            e_msg_composer_set_source_headers (
                composer, folder_uri, uid,
                CAMEL_MESSAGE_FORWARDED);

            g_free (folder_uri);
        }

        emu_update_composers_security (
            composer, validity_found);
        composer_set_no_change (composer);
        gtk_widget_show (GTK_WIDGET (composer));

        g_free (text);
    }

    g_free (forward);

    return composer;
}

/**
 * em_utils_forward_message:
 * @shell: an #EShell
 * @message: a #CamelMimeMessage to forward
 * @style: the forward style to use
 * @folder: a #CamelFolder, or %NULL
 * @uid: the UID of %message, or %NULL
 *
 * Forwards a message in the given style.  See em_utils_forward_messages()
 * for more details about forwarding styles.
 **/
EMsgComposer *
em_utils_forward_message (EShell *shell,
                          CamelMimeMessage *message,
                          EMailForwardStyle style,
                          CamelFolder *folder,
                          const gchar *uid)
{
    CamelMimePart *part;
    gchar *subject;
    EMsgComposer *composer = NULL;

    g_return_val_if_fail (E_IS_SHELL (shell), NULL);
    g_return_val_if_fail (CAMEL_IS_MIME_MESSAGE (message), NULL);

    switch (style) {
        case E_MAIL_FORWARD_STYLE_ATTACHED:
        default:
            part = mail_tool_make_message_attachment (message);
            subject = mail_tool_generate_forward_subject (message);

            composer = forward_attached (
                shell, NULL, NULL, part, subject);

            g_object_unref (part);
            g_free (subject);
            break;

        case E_MAIL_FORWARD_STYLE_INLINE:
        case E_MAIL_FORWARD_STYLE_QUOTED:
            composer = forward_non_attached (
                shell, folder, uid, message, style);
            break;
    }

    return composer;
}

static void
forward_got_messages_cb (CamelFolder *folder,
                         GAsyncResult *result,
                         AsyncContext *context)
{
    EShell *shell;
    EMailBackend *backend;
    EAlertSink *alert_sink;
    GHashTable *hash_table;
    GHashTableIter iter;
    gpointer key, value;
    GError *error = NULL;

    alert_sink = e_mail_reader_get_alert_sink (context->reader);

    hash_table = e_mail_folder_get_multiple_messages_finish (
        folder, result, &error);

    if (e_activity_handle_cancellation (context->activity, error)) {
        g_warn_if_fail (hash_table == NULL);
        async_context_free (context);
        g_error_free (error);
        return;

    } else if (error != NULL) {
        g_warn_if_fail (hash_table == NULL);
        e_alert_submit (
            alert_sink,
            "mail:get-multiple-messages",
            error->message, NULL);
        async_context_free (context);
        g_error_free (error);
        return;
    }

    g_return_if_fail (hash_table != NULL);

    backend = e_mail_reader_get_backend (context->reader);
    shell = e_shell_backend_get_shell (E_SHELL_BACKEND (backend));

    /* Create a new composer window for each message. */

    g_hash_table_iter_init (&iter, hash_table);

    while (g_hash_table_iter_next (&iter, &key, &value))
        em_utils_forward_message (
            shell, value, context->style, folder, key);

    g_hash_table_unref (hash_table);

    e_activity_set_state (context->activity, E_ACTIVITY_COMPLETED);

    async_context_free (context);
}

/**
 * em_utils_forward_messages:
 * @shell: an #EShell
 * @folder: folder containing messages to forward
 * @uids: uids of messages to forward
 * @style: the forward style to use
 *
 * Forwards a group of messages in the given style.
 *
 * If @style is #E_MAIL_FORWARD_STYLE_ATTACHED, the new message is
 * created as follows.  If there is more than a single message in @uids,
 * a multipart/digest will be constructed and attached to a new composer
 * window preset with the appropriate header defaults for forwarding the
 * first message in the list.  If only one message is to be forwarded,
 * it is forwarded as a simple message/rfc822 attachment.
 *
 * If @style is #E_MAIL_FORWARD_STYLE_INLINE, each message is forwarded
 * in its own composer window in 'inline' form.
 *
 * If @style is #E_MAIL_FORWARD_STYLE_QUOTED, each message is forwarded
 * in its own composer window in 'quoted' form (each line starting with
 * a "> ").
 **/
void
em_utils_forward_messages (EMailReader *reader,
                           CamelFolder *folder,
                           GPtrArray *uids,
                           EMailForwardStyle style)
{
    EActivity *activity;
    AsyncContext *context;
    GCancellable *cancellable;

    g_return_if_fail (E_IS_MAIL_READER (reader));
    g_return_if_fail (CAMEL_IS_FOLDER (folder));
    g_return_if_fail (uids != NULL);

    activity = e_mail_reader_new_activity (reader);
    cancellable = e_activity_get_cancellable (activity);

    context = g_slice_new0 (AsyncContext);
    context->activity = activity;
    context->reader = g_object_ref (reader);
    context->ptr_array = g_ptr_array_ref (uids);
    context->style = style;

    switch (style) {
        case E_MAIL_FORWARD_STYLE_ATTACHED:
            e_mail_folder_build_attachment (
                folder, uids, G_PRIORITY_DEFAULT,
                cancellable, (GAsyncReadyCallback)
                forward_attached_cb, context);
            break;

        case E_MAIL_FORWARD_STYLE_INLINE:
        case E_MAIL_FORWARD_STYLE_QUOTED:
            e_mail_folder_get_multiple_messages (
                folder, uids, G_PRIORITY_DEFAULT,
                cancellable, (GAsyncReadyCallback)
                forward_got_messages_cb, context);
            break;

        default:
            g_warn_if_reached ();
    }
}

/* Redirecting messages... */

static EMsgComposer *
redirect_get_composer (EShell *shell,
                       CamelMimeMessage *message)
{
    EMsgComposer *composer;
    EAccount *account;

    /* QMail will refuse to send a message if it finds one of
       it's Delivered-To headers in the message, so remove all
       Delivered-To headers. Fixes bug #23635. */
    while (camel_medium_get_header (CAMEL_MEDIUM (message), "Delivered-To"))
        camel_medium_remove_header (CAMEL_MEDIUM (message), "Delivered-To");

    while (camel_medium_get_header (CAMEL_MEDIUM (message), "Bcc"))
        camel_medium_remove_header (CAMEL_MEDIUM (message), "Bcc");

    while (camel_medium_get_header (CAMEL_MEDIUM (message), "Resent-Bcc"))
        camel_medium_remove_header (CAMEL_MEDIUM (message), "Resent-Bcc");

    account = em_utils_guess_account_with_recipients (message, NULL);

    composer = e_msg_composer_new_redirect (
        shell, message, account ? account->name : NULL, NULL);

    return composer;
}

/**
 * em_utils_redirect_message:
 * @shell: an #EShell
 * @message: message to redirect
 *
 * Opens a composer to redirect @message (Note: only headers will be
 * editable). Adds Resent-From/Resent-To/etc headers.
 **/
void
em_utils_redirect_message (EShell *shell,
                           CamelMimeMessage *message)
{
    EMsgComposer *composer;

    g_return_if_fail (E_IS_SHELL (shell));
    g_return_if_fail (CAMEL_IS_MIME_MESSAGE (message));

    composer = redirect_get_composer (shell, message);

    gtk_widget_show (GTK_WIDGET (composer));

    composer_set_no_change (composer);
}

/* Message disposition notifications, rfc 2298 */
void
em_utils_handle_receipt (EMailSession *session,
                         CamelFolder *folder,
                         const gchar *message_uid,
                         CamelMimeMessage *message)
{
    EAccount *account;
    const gchar *addr;
    CamelMessageInfo *info;

    g_return_if_fail (E_IS_MAIL_SESSION (session));
    g_return_if_fail (CAMEL_IS_FOLDER (folder));
    g_return_if_fail (CAMEL_IS_MIME_MESSAGE (message));

    info = camel_folder_get_message_info (folder, message_uid);
    if (info == NULL)
        return;

    if (camel_message_info_user_flag (info, "receipt-handled")) {
        camel_folder_free_message_info (folder, info);
        return;
    }

    addr = camel_medium_get_header (
        CAMEL_MEDIUM (message), "Disposition-Notification-To");
    if (addr == NULL) {
        camel_folder_free_message_info (folder, info);
        return;
    }

    camel_message_info_set_user_flag (info, "receipt-handled", TRUE);
    camel_folder_free_message_info (folder, info);

    account = em_utils_guess_account_with_recipients (message, folder);

    /* TODO Should probably decode/format the address,
     *      since it could be in rfc2047 format. */
    if (addr == NULL) {
        addr = "";
    } else {
        while (camel_mime_is_lwsp (*addr))
            addr++;
    }

    if (account == NULL)
        return;

    if (account->receipt_policy == E_ACCOUNT_RECEIPT_NEVER)
        return;

    if (account->receipt_policy == E_ACCOUNT_RECEIPT_ASK) {
        GtkWindow *window;
        const gchar *subject;
        gint response;

        /* FIXME Parent window should be passed in. */
        window = e_shell_get_active_window (NULL);
        subject = camel_mime_message_get_subject (message);

        response = e_alert_run_dialog_for_args (
            window, "mail:ask-receipt", addr, subject, NULL);

        if (response != GTK_RESPONSE_YES)
            return;
    }

    em_utils_send_receipt (session, folder, message);
}

static void
em_utils_receipt_done (CamelFolder *folder,
                       GAsyncResult *result,
                       EMailSession *session)
{
    /* FIXME Poor error handling. */
    if (!e_mail_folder_append_message_finish (folder, result, NULL, NULL))
        return;

    mail_send (session);
}

void
em_utils_send_receipt (EMailSession *session,
                       CamelFolder *folder,
                       CamelMimeMessage *message)
{
    /* See RFC #3798 for a description of message receipts */
    EAccount *account = em_utils_guess_account_with_recipients (message, folder);
    CamelMimeMessage *receipt = camel_mime_message_new ();
    CamelMultipart *body = camel_multipart_new ();
    CamelMimePart *part;
    CamelDataWrapper *receipt_text, *receipt_data;
    CamelContentType *type;
    CamelInternetAddress *addr;
    CamelStream *stream;
    CamelFolder *out_folder;
    CamelMessageInfo *info;
    const gchar *message_id;
    const gchar *message_date;
    const gchar *message_subject;
    const gchar *receipt_address;
    gchar *fake_msgid;
    gchar *hostname;
    gchar *self_address, *receipt_subject;
    gchar *ua, *recipient;
    gchar *transport_uid;

    message_id = camel_medium_get_header (
        CAMEL_MEDIUM (message), "Message-ID");
    message_date = camel_medium_get_header (
        CAMEL_MEDIUM (message), "Date");
    message_subject = camel_mime_message_get_subject (message);
    receipt_address = camel_medium_get_header (
        CAMEL_MEDIUM (message), "Disposition-Notification-To");

    if (!receipt_address)
        return;

    /* the 'account' should be always set */
    g_return_if_fail (account != NULL);

    /* Collect information for the receipt */

    /* We use camel_header_msgid_generate () to get a canonical
     * hostname, then skip the part leading to '@' */
    hostname = strchr ((fake_msgid = camel_header_msgid_generate ()), '@');
    hostname++;

    self_address = account->id->address;

    if (!message_id)
        message_id = "";
    if (!message_date)
        message_date ="";

    /* Create toplevel container */
    camel_data_wrapper_set_mime_type (CAMEL_DATA_WRAPPER (body),
                      "multipart/report;"
                      "report-type=\"disposition-notification\"");
    camel_multipart_set_boundary (body, NULL);

    /* Create textual receipt */
    receipt_text = camel_data_wrapper_new ();
    type = camel_content_type_new ("text", "plain");
    camel_content_type_set_param (type, "format", "flowed");
    camel_content_type_set_param (type, "charset", "UTF-8");
    camel_data_wrapper_set_mime_type_field (receipt_text, type);
    camel_content_type_unref (type);
    stream = camel_stream_mem_new ();
    camel_stream_printf (stream,
    /* Translators: First %s is an email address, second %s
     * is the subject of the email, third %s is the date. */
        _("Your message to %s about \"%s\" on %s has been read."),
        self_address, message_subject, message_date);
    camel_data_wrapper_construct_from_stream_sync (
        receipt_text, stream, NULL, NULL);
    g_object_unref (stream);

    part = camel_mime_part_new ();
    camel_medium_set_content (CAMEL_MEDIUM (part), receipt_text);
    camel_mime_part_set_encoding (
        part, CAMEL_TRANSFER_ENCODING_QUOTEDPRINTABLE);
    g_object_unref (receipt_text);
    camel_multipart_add_part (body, part);
    g_object_unref (part);

    /* Create the machine-readable receipt */
    receipt_data = camel_data_wrapper_new ();
    part = camel_mime_part_new ();

    ua = g_strdup_printf (
        "%s; %s", hostname, "Evolution "
        VERSION SUB_VERSION " " VERSION_COMMENT);
    recipient = g_strdup_printf ("rfc822; %s", self_address);

    type = camel_content_type_new ("message", "disposition-notification");
    camel_data_wrapper_set_mime_type_field (receipt_data, type);
    camel_content_type_unref (type);

    stream = camel_stream_mem_new ();
    camel_stream_printf (stream,
                 "Reporting-UA: %s\n"
                 "Final-Recipient: %s\n"
                 "Original-Message-ID: %s\n"
                 "Disposition: manual-action/MDN-sent-manually; displayed\n",
                 ua, recipient, message_id);
    camel_data_wrapper_construct_from_stream_sync (
        receipt_data, stream, NULL, NULL);
    g_object_unref (stream);

    g_free (ua);
    g_free (recipient);
    g_free (fake_msgid);

    camel_medium_set_content (CAMEL_MEDIUM (part), receipt_data);
    camel_mime_part_set_encoding (part, CAMEL_TRANSFER_ENCODING_7BIT);
    g_object_unref (receipt_data);
    camel_multipart_add_part (body, part);
    g_object_unref (part);

    /* Finish creating the message */
    camel_medium_set_content (CAMEL_MEDIUM (receipt), CAMEL_DATA_WRAPPER (body));
    g_object_unref (body);

    /* Translators: %s is the subject of the email message */
    receipt_subject = g_strdup_printf (
        _("Delivery Notification for: \"%s\""), message_subject);
    camel_mime_message_set_subject (receipt, receipt_subject);
    g_free (receipt_subject);

    addr = camel_internet_address_new ();
    camel_address_decode (CAMEL_ADDRESS (addr), self_address);
    camel_mime_message_set_from (receipt, addr);
    g_object_unref (addr);

    addr = camel_internet_address_new ();
    camel_address_decode (CAMEL_ADDRESS (addr), receipt_address);
    camel_mime_message_set_recipients (receipt, CAMEL_RECIPIENT_TYPE_TO, addr);
    g_object_unref (addr);

    transport_uid = g_strconcat (account->uid, "-transport", NULL);

    camel_medium_set_header (
        CAMEL_MEDIUM (receipt),
        "Return-Path", "<>");
    camel_medium_set_header (
        CAMEL_MEDIUM (receipt),
        "X-Evolution-Account",
        account->uid);
    camel_medium_set_header (
        CAMEL_MEDIUM (receipt),
        "X-Evolution-Transport",
        transport_uid);
    camel_medium_set_header (
        CAMEL_MEDIUM (receipt),
        "X-Evolution-Fcc",
        account->sent_folder_uri);

    g_free (transport_uid);

    /* Send the receipt */
    info = camel_message_info_new (NULL);
    out_folder = e_mail_local_get_folder (E_MAIL_LOCAL_FOLDER_OUTBOX);
    camel_message_info_set_flags (
        info, CAMEL_MESSAGE_SEEN, CAMEL_MESSAGE_SEEN);

    /* FIXME Pass a GCancellable. */
    e_mail_folder_append_message (
        out_folder, receipt, info, G_PRIORITY_DEFAULT, NULL,
        (GAsyncReadyCallback) em_utils_receipt_done, session);

    camel_message_info_free (info);
}

/* Replying to messages... */

EDestination **
em_utils_camel_address_to_destination (CamelInternetAddress *iaddr)
{
    EDestination *dest, **destv;
    gint n, i, j;

    if (iaddr == NULL)
        return NULL;

    if ((n = camel_address_length ((CamelAddress *) iaddr)) == 0)
        return NULL;

    destv = g_malloc (sizeof (EDestination *) * (n + 1));
    for (i = 0, j = 0; i < n; i++) {
        const gchar *name, *addr;

        if (camel_internet_address_get (iaddr, i, &name, &addr)) {
            dest = e_destination_new ();
            e_destination_set_name (dest, name);
            e_destination_set_email (dest, addr);

            destv[j++] = dest;
        }
    }

    if (j == 0) {
        g_free (destv);
        return NULL;
    }

    destv[j] = NULL;

    return destv;
}

static EMsgComposer *
reply_get_composer (EShell *shell,
                    CamelMimeMessage *message,
                    EAccount *account,
                    CamelInternetAddress *to,
                    CamelInternetAddress *cc,
                    CamelFolder *folder,
                    CamelNNTPAddress *postto)
{
    const gchar *message_id, *references;
    EDestination **tov, **ccv;
    EMsgComposer *composer;
    EComposerHeaderTable *table;
    gchar *subject;

    g_return_val_if_fail (E_IS_SHELL (shell), NULL);
    g_return_val_if_fail (CAMEL_IS_MIME_MESSAGE (message), NULL);
    g_return_val_if_fail (to == NULL || CAMEL_IS_INTERNET_ADDRESS (to), NULL);
    g_return_val_if_fail (cc == NULL || CAMEL_IS_INTERNET_ADDRESS (cc), NULL);

    composer = e_msg_composer_new (shell);

    /* construct the tov/ccv */
    tov = em_utils_camel_address_to_destination (to);
    ccv = em_utils_camel_address_to_destination (cc);

    /* Set the subject of the new message. */
    if ((subject = (gchar *) camel_mime_message_get_subject (message))) {
        if (g_ascii_strncasecmp (subject, "Re: ", 4) != 0 &&
            g_ascii_strncasecmp (subject, "Re : ", 5) != 0)
            subject = g_strdup_printf ("Re: %s", subject);
        else if (g_ascii_strncasecmp (subject, "Re : ", 5) == 0)
            subject = g_strdup_printf ("Re: %s", subject + 5);
        else
            subject = g_strdup (subject);
    } else {
        subject = g_strdup ("");
    }

    table = e_msg_composer_get_header_table (composer);
    e_composer_header_table_set_account (table, account);
    e_composer_header_table_set_subject (table, subject);
    e_composer_header_table_set_destinations_to (table, tov);

    /* Add destinations instead of setting, so we don't remove
     * automatic CC addresses that have already been added. */
    e_composer_header_table_add_destinations_cc (table, ccv);

    e_destination_freev (tov);
    e_destination_freev (ccv);
    g_free (subject);

    /* add post-to, if nessecary */
    if (postto && camel_address_length ((CamelAddress *) postto)) {
        gchar *store_url = NULL;
        gchar *post;

        if (folder) {
            CamelStore *parent_store;
            CamelService *service;
            CamelURL *url;

            parent_store = camel_folder_get_parent_store (folder);

            service = CAMEL_SERVICE (parent_store);
            url = camel_service_get_camel_url (service);

            store_url = camel_url_to_string (
                url, CAMEL_URL_HIDE_ALL);
            if (store_url[strlen (store_url) - 1] == '/')
                store_url[strlen (store_url)-1] = '\0';
        }

        post = camel_address_encode ((CamelAddress *) postto);
        e_composer_header_table_set_post_to_base (
            table, store_url ? store_url : "", post);
        g_free (post);
        g_free (store_url);
    }

    /* Add In-Reply-To and References. */
    message_id = camel_medium_get_header (CAMEL_MEDIUM (message), "Message-ID");
    references = camel_medium_get_header (CAMEL_MEDIUM (message), "References");
    if (message_id) {
        gchar *reply_refs;

        e_msg_composer_add_header (composer, "In-Reply-To", message_id);

        if (references)
            reply_refs = g_strdup_printf ("%s %s", references, message_id);
        else
            reply_refs = g_strdup (message_id);

        e_msg_composer_add_header (composer, "References", reply_refs);
        g_free (reply_refs);
    } else if (references) {
        e_msg_composer_add_header (composer, "References", references);
    }

    return composer;
}

static gboolean
get_reply_list (CamelMimeMessage *message, CamelInternetAddress *to)
{
    const gchar *header, *p;
    gchar *addr;

    /* Examples:
     *
     * List-Post: <mailto:list@host.com>
     * List-Post: <mailto:moderator@host.com?subject=list%20posting>
     * List-Post: NO (posting not allowed on this list)
     */
    if (!(header = camel_medium_get_header ((CamelMedium *) message, "List-Post")))
        return FALSE;

    while (*header == ' ' || *header == '\t')
        header++;

    /* check for NO */
    if (!g_ascii_strncasecmp (header, "NO", 2))
        return FALSE;

    /* Search for the first mailto angle-bracket enclosed URL.
     * (See rfc2369, Section 2, paragraph 3 for details) */
    if (!(header = camel_strstrcase (header, "<mailto:")))
        return FALSE;

    header += 8;

    p = header;
    while (*p && !strchr ("?>", *p))
        p++;

    addr = g_strndup (header, p - header);
    camel_internet_address_add (to, NULL, addr);
    g_free (addr);

    return TRUE;
}

gboolean
em_utils_is_munged_list_message (CamelMimeMessage *message)
{
    CamelInternetAddress *reply_to, *list;
    gboolean result = FALSE;

    reply_to = camel_mime_message_get_reply_to (message);
    if (reply_to) {
        list = camel_internet_address_new ();

        if (get_reply_list (message, list) &&
            camel_address_length (CAMEL_ADDRESS (list)) ==
            camel_address_length (CAMEL_ADDRESS (reply_to))) {
            gint i;
            const gchar *r_name, *r_addr;
            const gchar *l_name, *l_addr;

            for (i = 0; i < camel_address_length (CAMEL_ADDRESS (list)); i++) {
                if (!camel_internet_address_get (reply_to, i, &r_name, &r_addr))
                    break;
                if (!camel_internet_address_get (list, i, &l_name, &l_addr))
                    break;
                if (strcmp (l_addr, r_addr))
                    break;
            }
            if (i == camel_address_length (CAMEL_ADDRESS (list)))
                result = TRUE;
        }
        g_object_unref (list);
    }
    return result;
}

static CamelInternetAddress *
get_reply_to (CamelMimeMessage *message)
{
    CamelInternetAddress *reply_to;

    reply_to = camel_mime_message_get_reply_to (message);
    if (reply_to) {
        GConfClient *client;
        const gchar *key;
        gboolean ignore_list_reply_to;

        client = gconf_client_get_default ();
        key = "/apps/evolution/mail/composer/ignore_list_reply_to";
        ignore_list_reply_to = gconf_client_get_bool (client, key, NULL);
        g_object_unref (client);

        if (ignore_list_reply_to && em_utils_is_munged_list_message (message))
            reply_to = NULL;
    }
    if (!reply_to)
        reply_to = camel_mime_message_get_from (message);

    return reply_to;
}

static void
get_reply_sender (CamelMimeMessage *message,
                  CamelInternetAddress *to,
                  CamelNNTPAddress *postto)
{
    CamelInternetAddress *reply_to;
    const gchar *name, *addr, *posthdr;
    gint i;

    /* check whether there is a 'Newsgroups: ' header in there */
    if (postto
        && ((posthdr = camel_medium_get_header((CamelMedium *)message, "Followup-To"))
         || (posthdr = camel_medium_get_header((CamelMedium *)message, "Newsgroups")))) {
        camel_address_decode ((CamelAddress *) postto, posthdr);
        return;
    }

    reply_to = get_reply_to (message);

    if (reply_to) {
        for (i = 0; camel_internet_address_get (reply_to, i, &name, &addr); i++)
            camel_internet_address_add (to, name, addr);
    }
}

void
em_utils_get_reply_sender (CamelMimeMessage *message,
                           CamelInternetAddress *to,
                           CamelNNTPAddress *postto)
{
    get_reply_sender (message, to, postto);
}

static void
get_reply_from (CamelMimeMessage *message,
                CamelInternetAddress *to,
                CamelNNTPAddress *postto)
{
    CamelInternetAddress *from;
    const gchar *name, *addr, *posthdr;
    gint i;

    /* check whether there is a 'Newsgroups: ' header in there */
    if (postto
        && ((posthdr = camel_medium_get_header((CamelMedium *)message, "Followup-To"))
         || (posthdr = camel_medium_get_header((CamelMedium *)message, "Newsgroups")))) {
        camel_address_decode ((CamelAddress *) postto, posthdr);
        return;
    }

    from = camel_mime_message_get_from (message);

    if (from) {
        for (i = 0; camel_internet_address_get (from, i, &name, &addr); i++)
            camel_internet_address_add (to, name, addr);
    }
}

static void
concat_unique_addrs (CamelInternetAddress *dest,
                     CamelInternetAddress *src,
                     GHashTable *rcpt_hash)
{
    const gchar *name, *addr;
    gint i;

    for (i = 0; camel_internet_address_get (src, i, &name, &addr); i++) {
        if (!g_hash_table_lookup (rcpt_hash, addr)) {
            camel_internet_address_add (dest, name, addr);
            g_hash_table_insert (rcpt_hash, (gchar *) addr, GINT_TO_POINTER (1));
        }
    }
}

static void
get_reply_all (CamelMimeMessage *message,
               CamelInternetAddress *to,
               CamelInternetAddress *cc,
               CamelNNTPAddress *postto)
{
    CamelInternetAddress *reply_to, *to_addrs, *cc_addrs;
    const gchar *name, *addr, *posthdr;
    GHashTable *rcpt_hash;
    gint i;

    /* check whether there is a 'Newsgroups: ' header in there */
    if (postto) {
        if ((posthdr = camel_medium_get_header((CamelMedium *)message, "Followup-To")))
            camel_address_decode ((CamelAddress *) postto, posthdr);
        if ((posthdr = camel_medium_get_header((CamelMedium *)message, "Newsgroups")))
            camel_address_decode ((CamelAddress *) postto, posthdr);
    }

    rcpt_hash = em_utils_generate_account_hash ();

    reply_to = get_reply_to (message);
    to_addrs = camel_mime_message_get_recipients (message, CAMEL_RECIPIENT_TYPE_TO);
    cc_addrs = camel_mime_message_get_recipients (message, CAMEL_RECIPIENT_TYPE_CC);

    if (reply_to) {
        for (i = 0; camel_internet_address_get (reply_to, i, &name, &addr); i++) {
            /* ignore references to the Reply-To address in the To and Cc lists */
            if (addr && !g_hash_table_lookup (rcpt_hash, addr)) {
                /* In the case that we are doing a Reply-To-All, we do not want
                   to include the user's email address because replying to oneself
                   is kinda silly. */

                camel_internet_address_add (to, name, addr);
                g_hash_table_insert (rcpt_hash, (gchar *) addr, GINT_TO_POINTER (1));
            }
        }
    }

    concat_unique_addrs (cc, to_addrs, rcpt_hash);
    concat_unique_addrs (cc, cc_addrs, rcpt_hash);

    /* Promote the first Cc: address to To: if To: is empty. */
    if (camel_address_length ((CamelAddress *) to) == 0 &&
            camel_address_length ((CamelAddress *) cc) > 0) {
        camel_internet_address_get (cc, 0, &name, &addr);
        camel_internet_address_add (to, name, addr);
        camel_address_remove ((CamelAddress *) cc, 0);
    }

    /* If To: is still empty, may we removed duplicates (i.e. ourself),
     * so add the original To if it was set. */
    if (camel_address_length ((CamelAddress *) to) == 0
        && (camel_internet_address_get (to_addrs, 0, &name, &addr)
        || camel_internet_address_get (cc_addrs, 0, &name, &addr))) {
        camel_internet_address_add (to, name, addr);
    }

    g_hash_table_destroy (rcpt_hash);
}

void
em_utils_get_reply_all (CamelMimeMessage *message,
                        CamelInternetAddress *to,
                        CamelInternetAddress *cc,
                        CamelNNTPAddress *postto)
{
    get_reply_all (message, to, cc, postto);
}

enum {
    ATTRIB_UNKNOWN,
    ATTRIB_CUSTOM,
    ATTRIB_TIMEZONE,
    ATTRIB_STRFTIME,
    ATTRIB_TM_SEC,
    ATTRIB_TM_MIN,
    ATTRIB_TM_24HOUR,
    ATTRIB_TM_12HOUR,
    ATTRIB_TM_MDAY,
    ATTRIB_TM_MON,
    ATTRIB_TM_YEAR,
    ATTRIB_TM_2YEAR,
    ATTRIB_TM_WDAY, /* not actually used */
    ATTRIB_TM_YDAY
};

typedef void        (*AttribFormatter)  (GString *str,
                         const gchar *attr,
                         CamelMimeMessage *message);

static void
format_sender (GString *str, const gchar *attr, CamelMimeMessage *message)
{
    CamelInternetAddress *sender;
    const gchar *name, *addr = NULL;

    sender = camel_mime_message_get_from (message);
    if (sender != NULL && camel_address_length (CAMEL_ADDRESS (sender)) > 0) {
        camel_internet_address_get (sender, 0, &name, &addr);
    } else {
        name = _("an unknown sender");
    }

    if (name && !strcmp (attr, "{SenderName}")) {
        g_string_append (str, name);
    } else if (addr && !strcmp (attr, "{SenderEMail}")) {
        g_string_append (str, addr);
    } else if (name && *name) {
        g_string_append (str, name);
    } else if (addr) {
        g_string_append (str, addr);
    }
}

static struct {
    const gchar *name;
    gint type;
    struct {
        const gchar *format;         /* strftime or printf format */
        AttribFormatter formatter;  /* custom formatter */
    } v;
} attribvars[] = {
    { "{Sender}", ATTRIB_CUSTOM, { NULL, format_sender } },
    { "{SenderName}", ATTRIB_CUSTOM, { NULL, format_sender } },
    { "{SenderEMail}", ATTRIB_CUSTOM, { NULL, format_sender } },
    { "{AbbrevWeekdayName}", ATTRIB_STRFTIME, { "%a", NULL } },
    { "{WeekdayName}", ATTRIB_STRFTIME, { "%A", NULL } },
    { "{AbbrevMonthName}", ATTRIB_STRFTIME, { "%b", NULL } },
    { "{MonthName}", ATTRIB_STRFTIME, { "%B", NULL } },
    { "{AmPmUpper}", ATTRIB_STRFTIME, { "%p", NULL } },
    { "{AmPmLower}", ATTRIB_STRFTIME, { "%P", NULL } },
    { "{Day}", ATTRIB_TM_MDAY, { "%02d", NULL } },  /* %d  01-31 */
    { "{ Day}", ATTRIB_TM_MDAY, { "% 2d", NULL } },  /* %e   1-31 */
    { "{24Hour}", ATTRIB_TM_24HOUR, { "%02d", NULL } },  /* %H  00-23 */
    { "{12Hour}", ATTRIB_TM_12HOUR, { "%02d", NULL } },  /* %I  00-12 */
    { "{DayOfYear}", ATTRIB_TM_YDAY, { "%d", NULL } },  /* %j  1-366 */
    { "{Month}", ATTRIB_TM_MON, { "%02d", NULL } },  /* %m  01-12 */
    { "{Minute}", ATTRIB_TM_MIN, { "%02d", NULL } },  /* %M  00-59 */
    { "{Seconds}", ATTRIB_TM_SEC, { "%02d", NULL } },  /* %S  00-61 */
    { "{2DigitYear}", ATTRIB_TM_2YEAR, { "%02d", NULL } },  /* %y */
    { "{Year}", ATTRIB_TM_YEAR, { "%04d", NULL } },  /* %Y */
    { "{TimeZone}", ATTRIB_TIMEZONE, { "%+05d", NULL } }
};

static gchar *
attribution_format (CamelMimeMessage *message)
{
    register const gchar *inptr;
    const gchar *start;
    gint tzone, len, i;
    gchar buf[64], *s;
    GString *str;
    struct tm tm;
    time_t date;
    gint type;
    gchar *format = quoting_text (QUOTING_ATTRIBUTION);

    str = g_string_new ("");

    date = camel_mime_message_get_date (message, &tzone);

    if (date == CAMEL_MESSAGE_DATE_CURRENT) {
        /* The message has no Date: header, look at Received: */
        date = camel_mime_message_get_date_received (message, &tzone);
    }
    if (date == CAMEL_MESSAGE_DATE_CURRENT) {
        /* That didn't work either, use current time */
        time (&date);
        tzone = 0;
    }

    /* Convert to UTC */
    date += (tzone / 100) * 60 * 60;
    date += (tzone % 100) * 60;

    gmtime_r (&date, &tm);

    inptr = format;
    while (*inptr != '\0') {
        start = inptr;
        while (*inptr && strncmp (inptr, "${", 2) != 0)
            inptr++;

        g_string_append_len (str, start, inptr - start);

        if (*inptr == '\0')
            break;

        start = ++inptr;
        while (*inptr && *inptr != '}')
            inptr++;

        if (*inptr != '}') {
            /* broken translation */
            g_string_append_len (str, "${", 2);
            inptr = start + 1;
            continue;
        }

        inptr++;
        len = inptr - start;
        type = ATTRIB_UNKNOWN;
        for (i = 0; i < G_N_ELEMENTS (attribvars); i++) {
            if (!strncmp (attribvars[i].name, start, len)) {
                type = attribvars[i].type;
                break;
            }
        }

        switch (type) {
        case ATTRIB_CUSTOM:
            attribvars[i].v.formatter (str, attribvars[i].name, message);
            break;
        case ATTRIB_TIMEZONE:
            g_string_append_printf (str, attribvars[i].v.format, tzone);
            break;
        case ATTRIB_STRFTIME:
            e_utf8_strftime (buf, sizeof (buf), attribvars[i].v.format, &tm);
            g_string_append (str, buf);
            break;
        case ATTRIB_TM_SEC:
            g_string_append_printf (str, attribvars[i].v.format, tm.tm_sec);
            break;
        case ATTRIB_TM_MIN:
            g_string_append_printf (str, attribvars[i].v.format, tm.tm_min);
            break;
        case ATTRIB_TM_24HOUR:
            g_string_append_printf (str, attribvars[i].v.format, tm.tm_hour);
            break;
        case ATTRIB_TM_12HOUR:
            g_string_append_printf (str, attribvars[i].v.format, (tm.tm_hour + 1) % 13);
            break;
        case ATTRIB_TM_MDAY:
            g_string_append_printf (str, attribvars[i].v.format, tm.tm_mday);
            break;
        case ATTRIB_TM_MON:
            g_string_append_printf (str, attribvars[i].v.format, tm.tm_mon + 1);
            break;
        case ATTRIB_TM_YEAR:
            g_string_append_printf (str, attribvars[i].v.format, tm.tm_year + 1900);
            break;
        case ATTRIB_TM_2YEAR:
            g_string_append_printf (str, attribvars[i].v.format, tm.tm_year % 100);
            break;
        case ATTRIB_TM_WDAY:
            /* not actually used */
            g_string_append_printf (str, attribvars[i].v.format, tm.tm_wday);
            break;
        case ATTRIB_TM_YDAY:
            g_string_append_printf (str, attribvars[i].v.format, tm.tm_yday + 1);
            break;
        default:
            /* mis-spelled variable? drop the format argument and continue */
            break;
        }
    }

    s = str->str;
    g_string_free (str, FALSE);
    g_free (format);

    return s;
}

static void
composer_set_body (EMsgComposer *composer,
                   CamelMimeMessage *message,
                   EMailReplyStyle style,
                   EMFormat *source)
{
    gchar *text, *credits, *original;
    CamelMimePart *part;
    GConfClient *client;
    gboolean start_bottom, has_body_text = FALSE;
    guint32 validity_found = 0;
    const gchar *key;

    client = gconf_client_get_default ();

    key = "/apps/evolution/mail/composer/reply_start_bottom";
    start_bottom = gconf_client_get_bool (client, key, NULL);

    switch (style) {
    case E_MAIL_REPLY_STYLE_DO_NOT_QUOTE:
        /* do nothing */
        break;
    case E_MAIL_REPLY_STYLE_ATTACH:
        /* attach the original message as an attachment */
        part = mail_tool_make_message_attachment (message);
        e_msg_composer_attach (composer, part);
        g_object_unref (part);
        break;
    case E_MAIL_REPLY_STYLE_OUTLOOK:
        original = quoting_text (QUOTING_ORIGINAL);
        text = em_utils_message_to_html (
            message, original, EM_FORMAT_QUOTE_HEADERS, source,
            start_bottom ? "<BR>" : NULL, &validity_found);
        e_msg_composer_set_body_text (composer, text, TRUE);
        has_body_text = text && *text;
        g_free (text);
        g_free (original);
        emu_update_composers_security (composer, validity_found);
        break;

    case E_MAIL_REPLY_STYLE_QUOTED:
    default:
        /* do what any sane user would want when replying... */
        credits = attribution_format (message);
        text = em_utils_message_to_html (
            message, credits, EM_FORMAT_QUOTE_CITE, source,
            start_bottom ? "<BR>" : NULL, &validity_found);
        g_free (credits);
        e_msg_composer_set_body_text (composer, text, TRUE);
        has_body_text = text && *text;
        g_free (text);
        emu_update_composers_security (composer, validity_found);
        break;
    }

    if (has_body_text && start_bottom) {
        GtkhtmlEditor *editor = GTKHTML_EDITOR (composer);

        /* If we are placing signature on top, then move cursor to the end,
           otherwise try to find the signature place and place cursor just
           before the signature. We added there an empty line already. */
        gtkhtml_editor_run_command (editor, "block-selection");
        gtkhtml_editor_run_command (editor, "cursor-bod");
        if (gconf_client_get_bool (
            client, "/apps/evolution/mail/composer/top_signature", NULL)
            || !gtkhtml_editor_search_by_data (editor, 1, "ClueFlow", "signature", "1"))
            gtkhtml_editor_run_command (editor, "cursor-eod");
        else
            gtkhtml_editor_run_command (editor, "selection-move-left");
        gtkhtml_editor_run_command (editor, "unblock-selection");
    }

    g_object_unref (client);
}

gchar *
em_utils_construct_composer_text (CamelMimeMessage *message, EMFormat *source)
{
    gchar *text, *credits;
    gboolean start_bottom = 0;

    credits = attribution_format (message);
    text = em_utils_message_to_html (
        message, credits, EM_FORMAT_QUOTE_CITE, source,
        start_bottom ? "<BR>" : NULL, NULL);

    g_free (credits);
    return text;
}

/**
 * em_utils_reply_to_message:
 * @shell: an #EShell
 * @message: a #CamelMimeMessage
 * @folder: a #CamelFolder, or %NULL
 * @message_uid: the UID of @message, or %NULL
 * @type: the type of reply to create
 * @style: the reply style to use
 * @source: source to inherit view settings from
 *
 * Creates a new composer ready to reply to @message.
 *
 * @folder and @message_uid may be supplied in order to update the message
 * flags once it has been replied to.
 **/
EMsgComposer *
em_utils_reply_to_message (EShell *shell,
                           CamelMimeMessage *message,
                           CamelFolder *folder,
                           const gchar *message_uid,
                           EMailReplyType type,
                           EMailReplyStyle style,
                           EMFormat *source)
{
    CamelInternetAddress *to, *cc;
    CamelNNTPAddress *postto = NULL;
    EMsgComposer *composer;
    EAccount *account;
    guint32 flags;

    g_return_val_if_fail (E_IS_SHELL (shell), NULL);
    g_return_val_if_fail (CAMEL_IS_MIME_MESSAGE (message), NULL);

    to = camel_internet_address_new ();
    cc = camel_internet_address_new ();

    account = em_utils_guess_account_with_recipients (message, folder);
    flags = CAMEL_MESSAGE_ANSWERED | CAMEL_MESSAGE_SEEN;

    switch (type) {
    case E_MAIL_REPLY_TO_FROM:
        if (folder)
            postto = camel_nntp_address_new ();

        get_reply_from (message, to, postto);
        break;
    case E_MAIL_REPLY_TO_SENDER:
        if (folder)
            postto = camel_nntp_address_new ();

        get_reply_sender (message, to, postto);
        break;
    case E_MAIL_REPLY_TO_LIST:
        flags |= CAMEL_MESSAGE_ANSWERED_ALL;
        if (get_reply_list (message, to))
            break;
        /* falls through */
    case E_MAIL_REPLY_TO_ALL:
        flags |= CAMEL_MESSAGE_ANSWERED_ALL;
        if (folder)
            postto = camel_nntp_address_new ();

        get_reply_all (message, to, cc, postto);
        break;
    }

    composer = reply_get_composer (
        shell, message, account, to, cc, folder, postto);
    e_msg_composer_add_message_attachments (composer, message, TRUE);

    if (postto)
        g_object_unref (postto);
    g_object_unref (to);
    g_object_unref (cc);

    composer_set_body (composer, message, style, source);

    if (folder != NULL) {
        gchar *folder_uri;

        folder_uri = e_mail_folder_uri_from_folder (folder);

        e_msg_composer_set_source_headers (
            composer, folder_uri, message_uid, flags);

        g_free (folder_uri);
    }

    composer_set_no_change (composer);

    gtk_widget_show (GTK_WIDGET (composer));

    return composer;
}

static void
post_header_clicked_cb (EComposerPostHeader *header,
                        EMsgComposer *composer)
{
    EShell *shell;
    EShellBackend *shell_backend;
    GtkTreeSelection *selection;
    EMFolderSelector *selector;
    EMFolderTree *folder_tree;
    GtkWidget *dialog;
    GList *list;

    /* FIXME Figure out a way to pass the mail backend in. */
    shell = e_msg_composer_get_shell (composer);
    shell_backend = e_shell_get_backend_by_name (shell, "mail");

    dialog = em_folder_selector_new (
        GTK_WINDOW (composer),
        E_MAIL_BACKEND (shell_backend),
        EM_FOLDER_SELECTOR_CAN_CREATE,
        _("Posting destination"),
        _("Choose folders to post the message to."),
        NULL);

    selector = EM_FOLDER_SELECTOR (dialog);
    folder_tree = em_folder_selector_get_folder_tree (selector);

    em_folder_tree_set_excluded (
        folder_tree,
        EMFT_EXCLUDE_NOSELECT |
        EMFT_EXCLUDE_VIRTUAL |
        EMFT_EXCLUDE_VTRASH);

    selection = gtk_tree_view_get_selection (GTK_TREE_VIEW (folder_tree));
    gtk_tree_selection_set_mode (selection, GTK_SELECTION_MULTIPLE);

    list = e_composer_post_header_get_folders (header);
    em_folder_tree_set_selected_list (folder_tree, list, FALSE);
    g_list_foreach (list, (GFunc) g_free, NULL);
    g_list_free (list);

    if (gtk_dialog_run (GTK_DIALOG (dialog)) != GTK_RESPONSE_OK) {
        /* Prevent the header's "custom" flag from being reset,
         * which is what the default method will do next. */
        g_signal_stop_emission_by_name (header, "clicked");
        goto exit;
    }

    list = em_folder_tree_get_selected_uris (folder_tree);
    e_composer_post_header_set_folders (header, list);
    g_list_foreach (list, (GFunc) g_free, NULL);
    g_list_free (list);

exit:
    gtk_widget_destroy (dialog);
}

/**
 * em_configure_new_composer:
 * @composer: a newly created #EMsgComposer
 *
 * Integrates a newly created #EMsgComposer into the mail backend.  The
 * composer can't link directly to the mail backend without introducing
 * circular library dependencies, so this function finishes configuring
 * things the #EMsgComposer instance can't do itself.
 **/
void
em_configure_new_composer (EMsgComposer *composer)
{
    EComposerHeaderTable *table;
    EComposerHeaderType header_type;
    EComposerHeader *header;

    g_return_if_fail (E_IS_MSG_COMPOSER (composer));

    header_type = E_COMPOSER_HEADER_POST_TO;
    table = e_msg_composer_get_header_table (composer);
    header = e_composer_header_table_get_header (table, header_type);

    g_signal_connect (
        composer, "presend",
        G_CALLBACK (composer_presend_check_recipients), NULL);

    g_signal_connect (
        composer, "presend",
        G_CALLBACK (composer_presend_check_account), NULL);

    g_signal_connect (
        composer, "presend",
        G_CALLBACK (composer_presend_check_downloads), NULL);

    g_signal_connect (
        composer, "presend",
        G_CALLBACK (composer_presend_check_plugins), NULL);

    g_signal_connect (
        composer, "presend",
        G_CALLBACK (composer_presend_check_subject), NULL);

    g_signal_connect (
        composer, "presend",
        G_CALLBACK (composer_presend_check_unwanted_html), NULL);

    g_signal_connect (
        composer, "send",
        G_CALLBACK (em_utils_composer_send_cb), NULL);

    g_signal_connect (
        composer, "save-to-drafts",
        G_CALLBACK (em_utils_composer_save_to_drafts_cb), NULL);

    g_signal_connect (
        composer, "save-to-outbox",
        G_CALLBACK (em_utils_composer_save_to_outbox_cb), NULL);

    g_signal_connect (
        composer, "print",
        G_CALLBACK (em_utils_composer_print_cb), NULL);

    /* Handle "Post To:" button clicks, which displays a folder tree
     * widget.  The composer doesn't know about folder tree widgets,
     * so it can't handle this itself.
     *
     * Note: This is a G_SIGNAL_RUN_LAST signal, which allows us to
     *       stop the signal emission if the user cancels or closes
     *       the folder selector dialog.  See the handler function. */
    g_signal_connect (
        header, "clicked",
        G_CALLBACK (post_header_clicked_cb), composer);
}