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

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 *  Authors: Jeffrey Stedfast <fejj@ximian.com>
 *
 *  Copyright 2003 Ximian, Inc. (www.ximian.com)
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Street #330, Boston, MA 02111-1307, USA.
 *
 */

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

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

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

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

#include "e-util/e-error.h"

#include "em-utils.h"
#include "em-composer-utils.h"
#include "composer/e-msg-composer.h"
#include "em-format-html.h"
#include "em-format-quote.h"
#include "em-event.h"

#include "libedataserver/e-account-list.h"

#include <camel/camel-multipart.h>
#include <camel/camel-string-utils.h>
#include <camel/camel-stream-mem.h>
#include <camel/camel-nntp-address.h>
#include <camel/camel-vee-folder.h>

#ifdef G_OS_WIN32
/* Undef the similar macro from pthread.h, it doesn't check if
 * gmtime() returns NULL.
 */
#undef gmtime_r

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

static EAccount * guess_account (CamelMimeMessage *message, CamelFolder *folder);

struct emcs_t {
    unsigned int ref_count;
    
    CamelFolder *drafts_folder;
    char *drafts_uid;
    
    CamelFolder *folder;
    guint32 flags, set;
    char *uid;
};

static struct emcs_t *
emcs_new (void)
{
    struct emcs_t *emcs;
    
    emcs = g_new (struct emcs_t, 1);
    emcs->ref_count = 1;
    emcs->drafts_folder = NULL;
    emcs->drafts_uid = NULL;
    emcs->folder = NULL;
    emcs->flags = 0;
    emcs->set = 0;
    emcs->uid = NULL;
    
    return emcs;
}

static void
free_emcs (struct emcs_t *emcs)
{
    if (emcs->drafts_folder)
        camel_object_unref (emcs->drafts_folder);
    g_free (emcs->drafts_uid);
    
    if (emcs->folder)
        camel_object_unref (emcs->folder);
    g_free (emcs->uid);
    g_free (emcs);
}

static void
emcs_ref (struct emcs_t *emcs)
{
    emcs->ref_count++;
}

static void
emcs_unref (struct emcs_t *emcs)
{
    emcs->ref_count--;
    if (emcs->ref_count == 0)
        free_emcs (emcs);
}

static void
composer_destroy_cb (gpointer user_data, GObject *deadbeef)
{
    emcs_unref (user_data);
}

static gboolean
ask_confirm_for_unwanted_html_mail (EMsgComposer *composer, EDestination **recipients)
{
    gboolean res;
    GString *str;
    int i;
    
    str = g_string_new("");
    for (i = 0; recipients[i] != NULL; ++i) {
        if (!e_destination_get_html_mail_pref (recipients[i])) {
            const char *name;
            
            name = e_destination_get_textrep (recipients[i], FALSE);
            
            g_string_append_printf (str, "     %s\n", name);
        }
    }

    res = em_utils_prompt_user((GtkWindow *)composer,"/apps/evolution/mail/prompts/unwanted_html",
                   "mail:ask-send-html", str->str, NULL);
    g_string_free(str, TRUE);

    return res;
}

static gboolean
ask_confirm_for_empty_subject (EMsgComposer *composer)
{
    return em_utils_prompt_user((GtkWindow *)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((GtkWindow *)composer, "/apps/evolution/mail/prompts/only_bcc",
                    hidden_list_case?"mail:ask-send-only-bcc-contact":"mail:ask-send-only-bcc", NULL);
}

struct _send_data {
    struct emcs_t *emcs;
    EMsgComposer *composer;
    gboolean send;
};

static void
composer_send_queued_cb (CamelFolder *folder, CamelMimeMessage *msg, CamelMessageInfo *info,
             int queued, const char *appended_uid, void *data)
{
    struct emcs_t *emcs;
    struct _send_data *send = data;
    
    emcs = send->emcs;
    
    if (queued) {
        if (emcs && emcs->drafts_folder) {
            /* delete the old draft message */
            camel_folder_set_message_flags (emcs->drafts_folder, emcs->drafts_uid,
                            CAMEL_MESSAGE_DELETED | CAMEL_MESSAGE_SEEN,
                            CAMEL_MESSAGE_DELETED | CAMEL_MESSAGE_SEEN);
            camel_object_unref (emcs->drafts_folder);
            emcs->drafts_folder = NULL;
            g_free (emcs->drafts_uid);
            emcs->drafts_uid = NULL;
        }
        
        if (emcs && emcs->folder) {
            /* set any replied flags etc */
            camel_folder_set_message_flags (emcs->folder, emcs->uid, emcs->flags, emcs->set);
            camel_folder_set_message_user_flag (emcs->folder, emcs->uid, "receipt-handled", TRUE);
            camel_object_unref (emcs->folder);
            emcs->folder = NULL;
            g_free (emcs->uid);
            emcs->uid = NULL;
        }
        
        gtk_widget_destroy (GTK_WIDGET (send->composer));
        
        if (send->send && camel_session_is_online (session)) {
            /* queue a message send */
            mail_send ();
        }
    } else {
        if (!emcs) {
            /* disconnect the previous signal handlers */
            g_signal_handlers_disconnect_matched (send->composer, G_SIGNAL_MATCH_FUNC, 0,
                                  0, NULL, em_utils_composer_send_cb, NULL);
            g_signal_handlers_disconnect_matched (send->composer, G_SIGNAL_MATCH_FUNC, 0,
                                  0, NULL, em_utils_composer_save_draft_cb, NULL);
            
            /* reconnect to the signals using a non-NULL emcs for the callback data */
            em_composer_utils_setup_default_callbacks (send->composer);
        }
        
        e_msg_composer_set_enable_autosave (send->composer, TRUE);
        gtk_widget_show (GTK_WIDGET (send->composer));
    }
    
    camel_message_info_free (info);
    
    if (send->emcs)
        emcs_unref (send->emcs);
    
    g_object_unref (send->composer);
    g_free (send);
}

static CamelMimeMessage *
composer_get_message (EMsgComposer *composer, gboolean save_html_object_data)
{
    CamelMimeMessage *message = NULL;
    EDestination **recipients, **recipients_bcc;
    gboolean send_html, confirm_html;
    CamelInternetAddress *cia;
    int hidden = 0, shown = 0;
    int num = 0, num_bcc = 0, num_post = 0;
    const char *subject;
    GConfClient *gconf;
    EAccount *account;
    int i;
    GList *postlist;
    
    gconf = mail_config_get_gconf_client ();
    
    /* 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. to get a passphrase to sign a message) */
    
    /* get the message recipients */
    recipients = e_msg_composer_get_recipients (composer);
    
    cia = camel_internet_address_new ();
    
    /* see which ones are visible/present, etc */
    if (recipients) {
        for (i = 0; recipients[i] != NULL; i++) {
            const char *addr = e_destination_get_address (recipients[i]);
            
            if (addr && addr[0]) {
                camel_address_decode ((CamelAddress *) cia, addr);
                if (camel_address_length ((CamelAddress *) cia) > 0) {
                    camel_address_remove ((CamelAddress *) cia, -1);
                    num++;
                    if (e_destination_is_evolution_list (recipients[i])
                        && !e_destination_list_show_addresses (recipients[i])) {
                        hidden++;
                    } else {
                        shown++;
                    }
                }
            }
        }
    }
    
    recipients_bcc = e_msg_composer_get_bcc (composer);
    if (recipients_bcc) {
        for (i = 0; recipients_bcc[i] != NULL; i++) {
            const char *addr = e_destination_get_address (recipients_bcc[i]);
            
            if (addr && addr[0]) {
                camel_address_decode ((CamelAddress *) cia, addr);
                if (camel_address_length ((CamelAddress *) cia) > 0) {
                    camel_address_remove ((CamelAddress *) cia, -1);
                    num_bcc++;
                }
            }
        }
        
        e_destination_freev (recipients_bcc);
    }
    
    camel_object_unref (cia);

    postlist = e_msg_composer_hdrs_get_post_to(e_msg_composer_get_hdrs (composer));
    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_error_run((GtkWindow *)composer, "mail:send-no-recipients", NULL);
        goto finished;
    }
    
    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;
    }
    
    send_html = gconf_client_get_bool (gconf, "/apps/evolution/mail/composer/send_html", NULL);
    confirm_html = gconf_client_get_bool (gconf, "/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 (e_msg_composer_get_send_html (composer) && send_html && confirm_html) {
        gboolean html_problem = FALSE;
        
        if (recipients) {
            for (i = 0; recipients[i] != NULL && !html_problem; i++) {
                if (!e_destination_get_html_mail_pref (recipients[i]))
                    html_problem = TRUE;
            }
        }
        
        if (html_problem) {
            html_problem = !ask_confirm_for_unwanted_html_mail (composer, recipients);
            if (html_problem)
                goto finished;
        }
    }
    
    /* Check for no subject */
    subject = e_msg_composer_get_subject (composer);
    if (subject == NULL || subject[0] == '\0') {
        if (!ask_confirm_for_empty_subject (composer))
            goto finished;
    }
    
    /* actually get the message now, this will sign/encrypt etc */
    message = e_msg_composer_get_message (composer, save_html_object_data);
    if (message == NULL)
        goto finished;
    
    /* Add info about the sending account */
    account = e_msg_composer_get_preferred_account (composer);
    
    if (account) {
        /* FIXME: Why isn't this crap just in e_msg_composer_get_message? */
        camel_medium_set_header (CAMEL_MEDIUM (message), "X-Evolution-Account", account->uid);
        camel_medium_set_header (CAMEL_MEDIUM (message), "X-Evolution-Transport", account->transport->url);
        camel_medium_set_header (CAMEL_MEDIUM (message), "X-Evolution-Fcc", account->sent_folder_uri);
        if (account->id->organization && *account->id->organization) {
            char *org;
            
            org = camel_header_encode_string ((const unsigned char *)account->id->organization);
            camel_medium_set_header (CAMEL_MEDIUM (message), "Organization", org);
            g_free (org);
        }
    }
    
 finished:
    
    if (recipients)
        e_destination_freev (recipients);
    
    return message;
}

void
em_utils_composer_send_cb (EMsgComposer *composer, gpointer user_data)
{
    CamelMimeMessage *message;
    CamelMessageInfo *info;
    struct _send_data *send;
    CamelFolder *mail_folder;
    EAccount *account;

    account = e_msg_composer_get_preferred_account (composer);
    if (!account->enabled) {
        e_error_run((GtkWindow *)composer, "mail:send-no-account-enabled", NULL);
        return;
    }

    if (!(message = composer_get_message (composer, FALSE)))
        return;

    mail_folder = mail_component_get_folder(NULL, MAIL_COMPONENT_FOLDER_OUTBOX);
    camel_object_ref (mail_folder);
    
    /* mail the message */
    info = camel_message_info_new(NULL);
    camel_message_info_set_flags(info, CAMEL_MESSAGE_SEEN, ~0);
        
    send = g_malloc (sizeof (*send));
    send->emcs = user_data;
    if (send->emcs)
        emcs_ref (send->emcs);
    send->send = TRUE;
    send->composer = composer;
    g_object_ref (composer);
    gtk_widget_hide (GTK_WIDGET (composer));

    e_msg_composer_set_enable_autosave (composer, FALSE);
        
    mail_append_mail (mail_folder, message, info, composer_send_queued_cb, send);
    camel_object_unref (mail_folder);
    camel_object_unref (message);
}

struct _save_draft_info {
    struct emcs_t *emcs;
    EMsgComposer *composer;
    CamelMessageInfo *info;
    int quit;
};

static void
save_draft_done (CamelFolder *folder, CamelMimeMessage *msg, CamelMessageInfo *info, int ok,
         const char *appended_uid, void *user_data)
{
    struct _save_draft_info *sdi = user_data;
    struct emcs_t *emcs;
    
    if (!ok)
        goto done;

    e_msg_composer_set_saved (sdi->composer);
    
    if ((emcs = sdi->emcs) == NULL) {
        emcs = emcs_new ();
        
        /* disconnect the previous signal handlers */
        g_signal_handlers_disconnect_by_func (sdi->composer, G_CALLBACK (em_utils_composer_send_cb), NULL);
        g_signal_handlers_disconnect_by_func (sdi->composer, G_CALLBACK (em_utils_composer_save_draft_cb), NULL);
        
        /* reconnect to the signals using a non-NULL emcs for the callback data */
        em_composer_utils_setup_default_callbacks (sdi->composer);
    }
    
    if (emcs->drafts_folder) {
        /* delete the original draft message */
        camel_folder_set_message_flags (emcs->drafts_folder, emcs->drafts_uid,
                        CAMEL_MESSAGE_DELETED | CAMEL_MESSAGE_SEEN,
                        CAMEL_MESSAGE_DELETED | CAMEL_MESSAGE_SEEN);
        camel_object_unref (emcs->drafts_folder);
        emcs->drafts_folder = NULL;
        g_free (emcs->drafts_uid);
        emcs->drafts_uid = NULL;
    }
    
    if (emcs->folder) {
        /* set the replied flags etc */
        camel_folder_set_message_flags (emcs->folder, emcs->uid, emcs->flags, emcs->set);
        camel_object_unref (emcs->folder);
        emcs->folder = NULL;
        g_free (emcs->uid);
        emcs->uid = NULL;
    }
    
    if (appended_uid) {
        camel_object_ref (folder);
        emcs->drafts_folder = folder;
        emcs->drafts_uid = g_strdup (appended_uid);
    }
    
    if (sdi->quit)
        gtk_widget_destroy (GTK_WIDGET (sdi->composer));
    
 done:
    g_object_unref (sdi->composer);
    if (sdi->emcs)
        emcs_unref (sdi->emcs);
    camel_message_info_free(info);
    g_free (sdi);
}

static void
save_draft_folder (char *uri, CamelFolder *folder, gpointer data)
{
    CamelFolder **save = data;
    
    if (folder) {
        *save = folder;
        camel_object_ref (folder);
    }
}

void
em_utils_composer_save_draft_cb (EMsgComposer *composer, int quit, gpointer user_data)
{
    const char *default_drafts_folder_uri = mail_component_get_folder_uri(NULL, MAIL_COMPONENT_FOLDER_DRAFTS);
    CamelFolder *drafts_folder = mail_component_get_folder(NULL, MAIL_COMPONENT_FOLDER_DRAFTS);
    struct _save_draft_info *sdi;
    CamelFolder *folder = NULL;
    CamelMimeMessage *msg;
    CamelMessageInfo *info;
    EAccount *account;

    /* need to get stuff from the composer here, since it could
     * get destroyed while we're in mail_msg_wait() a little lower
     * down, waiting for the folder to open */

    g_object_ref(composer);
    msg = e_msg_composer_get_message_draft (composer);
    account = e_msg_composer_get_preferred_account (composer);

    sdi = g_malloc(sizeof(struct _save_draft_info));
    sdi->composer = composer;
    sdi->emcs = user_data;
    if (sdi->emcs)
        emcs_ref(sdi->emcs);
    sdi->quit = quit;

    if (account && account->drafts_folder_uri &&
        strcmp (account->drafts_folder_uri, default_drafts_folder_uri) != 0) {
        int id;
        
        id = mail_get_folder (account->drafts_folder_uri, 0, save_draft_folder, &folder, mail_thread_new);
        mail_msg_wait (id);
        
        if (!folder || !account->enabled) {
            if (e_error_run((GtkWindow *)composer, "mail:ask-default-drafts", NULL) != GTK_RESPONSE_YES) {
                g_object_unref(composer);
                camel_object_unref(msg);
                if (sdi->emcs)
                    emcs_unref(sdi->emcs);
                g_free(sdi);
                return;
            }
            
            folder = drafts_folder;
            camel_object_ref (drafts_folder);
        }
    } else {
        folder = drafts_folder;
        camel_object_ref (folder);
    }
    
    info = camel_message_info_new(NULL);
    camel_message_info_set_flags(info, CAMEL_MESSAGE_DRAFT | CAMEL_MESSAGE_SEEN, ~0);

    mail_append_mail (folder, msg, info, save_draft_done, sdi);
    camel_object_unref (folder);
    camel_object_unref (msg);
}

void
em_composer_utils_setup_callbacks (EMsgComposer *composer, CamelFolder *folder, const char *uid,
                   guint32 flags, guint32 set, CamelFolder *drafts, const char *drafts_uid)
{
    struct emcs_t *emcs;
    
    emcs = emcs_new ();
    
    if (folder && uid) {
        camel_object_ref (folder);
        emcs->folder = folder;
        emcs->uid = g_strdup (uid);
        emcs->flags = flags;
        emcs->set = set;
    }
    
    if (drafts && drafts_uid) {
        camel_object_ref (drafts);
        emcs->drafts_folder = drafts;
        emcs->drafts_uid = g_strdup (drafts_uid);
    }
    
    g_signal_connect (composer, "send", G_CALLBACK (em_utils_composer_send_cb), emcs);
    g_signal_connect (composer, "save-draft", G_CALLBACK (em_utils_composer_save_draft_cb), emcs);
    
    g_object_weak_ref ((GObject *) composer, (GWeakNotify) composer_destroy_cb, emcs);
}

/* Composing messages... */

static EMsgComposer *
create_new_composer (const char *subject, const char *fromuri)
{
    EMsgComposer *composer;
    EAccount *account = NULL;

    composer = e_msg_composer_new ();
    if (composer == NULL)
        return NULL;

    if (fromuri)
        account = mail_config_get_account_by_source_url(fromuri);

    /* If the account corresponding to the fromuri is not enabled.
     * We get the preffered account from the composer and use that
     * as the account to send the mail.
     */
    if (!account)
        account = e_msg_composer_get_preferred_account (composer);

    e_msg_composer_set_headers (composer, account?account->name:NULL, NULL, NULL, NULL, subject);

    em_composer_utils_setup_default_callbacks (composer);

    return composer;
}

/**
 * em_utils_compose_new_message:
 *
 * Opens a new composer window as a child window of @parent's toplevel
 * window.
 **/
void
em_utils_compose_new_message (const char *fromuri)
{
    GtkWidget *composer;

    composer = (GtkWidget *) create_new_composer ("", fromuri);
    if (composer == NULL)
        return;

    e_msg_composer_unset_changed ((EMsgComposer *)composer);
    e_msg_composer_drop_editor_undo ((EMsgComposer *)composer);

    gtk_widget_show (composer);
}

/**
 * em_utils_compose_new_message_with_mailto:
 * @url: mailto url
 *
 * Opens a new composer window as a child window of @parent's toplevel
 * window. If @url is non-NULL, the composer fields will be filled in
 * according to the values in the mailto url.
 **/
void
em_utils_compose_new_message_with_mailto (const char *url, const char *fromuri)
{
    EMsgComposer *composer;
    EAccount *account = NULL;
    
    if (url != NULL)
        composer = e_msg_composer_new_from_url (url);
    else
        composer = e_msg_composer_new ();
    
    em_composer_utils_setup_default_callbacks (composer);

    if (fromuri
        && (account = mail_config_get_account_by_source_url(fromuri)))
        e_msg_composer_hdrs_set_from_account(e_msg_composer_get_hdrs(composer), account->name);

    e_msg_composer_unset_changed (composer);
    e_msg_composer_drop_editor_undo (composer);
    
    gtk_widget_show ((GtkWidget *) composer);
    gdk_window_raise (((GtkWidget *) composer)->window);
}

/**
 * em_utils_post_to_folder:
 * @folder: folder
 *
 * Opens a new composer window as a child window of @parent's toplevel
 * window. If @folder is non-NULL, the composer will default to posting
 * mail to the folder specified by @folder.
 **/
void
em_utils_post_to_folder (CamelFolder *folder)
{
    EMsgComposer *composer;
    EAccount *account;
    
    composer = e_msg_composer_new_with_type (E_MSG_COMPOSER_POST);
    
    if (folder != NULL) {
        char *url = mail_tools_folder_to_url (folder);
        
        e_msg_composer_hdrs_set_post_to (e_msg_composer_get_hdrs (composer), url);
        g_free (url);
        
        url = camel_url_to_string (CAMEL_SERVICE (folder->parent_store)->url, CAMEL_URL_HIDE_ALL);
        account = mail_config_get_account_by_source_url (url);
        g_free (url);
        
        if (account)
            e_msg_composer_hdrs_set_from_account (e_msg_composer_get_hdrs(composer), account->name);
    }
    
    em_composer_utils_setup_default_callbacks (composer);
    
    e_msg_composer_unset_changed (composer);
    e_msg_composer_drop_editor_undo (composer);
    
    gtk_widget_show ((GtkWidget *) composer);
}

/**
 * em_utils_post_to_url:
 * @url: mailto url
 *
 * Opens a new composer window as a child window of @parent's toplevel
 * window. If @url is non-NULL, the composer will default to posting
 * mail to the folder specified by @url.
 **/
void
em_utils_post_to_url (const char *url)
{
    EMsgComposer *composer;
    
    composer = e_msg_composer_new_with_type (E_MSG_COMPOSER_POST);
    
    if (url != NULL)
        e_msg_composer_hdrs_set_post_to (e_msg_composer_get_hdrs (composer), url);
    
    em_composer_utils_setup_default_callbacks (composer);
    
    e_msg_composer_unset_changed (composer);
    e_msg_composer_drop_editor_undo (composer);
    
    gtk_widget_show ((GtkWidget *) composer);
}

/* Editing messages... */

static void
edit_message (CamelMimeMessage *message, CamelFolder *drafts, const char *uid)
{
    EMsgComposer *composer;

    composer = e_msg_composer_new_with_message (message);
    em_composer_utils_setup_callbacks (composer, NULL, NULL, 0, 0, drafts, uid);
    e_msg_composer_unset_changed (composer);
    e_msg_composer_drop_editor_undo (composer);
    
    gtk_widget_show (GTK_WIDGET (composer));
}

/**
 * em_utils_edit_message:
 * @message: message to edit
 *
 * Opens a composer filled in with the headers/mime-parts/etc of
 * @message.
 **/
void
em_utils_edit_message (CamelMimeMessage *message)
{
    g_return_if_fail (CAMEL_IS_MIME_MESSAGE (message));
    
    edit_message (message, NULL, NULL);
}

static void
edit_messages (CamelFolder *folder, GPtrArray *uids, GPtrArray *msgs, void *user_data)
{
    gboolean replace = GPOINTER_TO_INT (user_data);
    int i;
    
    if (msgs == NULL)
        return;
    
    for (i = 0; i < msgs->len; i++) {
        camel_medium_remove_header (CAMEL_MEDIUM (msgs->pdata[i]), "X-Mailer");
        
        if (replace)
            edit_message (msgs->pdata[i], folder, uids->pdata[i]);
        else
            edit_message (msgs->pdata[i], NULL, NULL);
    }
}

/**
 * em_utils_edit_messages:
 * @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 (CamelFolder *folder, GPtrArray *uids, gboolean replace)
{
    g_return_if_fail (CAMEL_IS_FOLDER (folder));
    g_return_if_fail (uids != NULL);
    
    mail_get_messages (folder, uids, edit_messages, GINT_TO_POINTER (replace));
}

/* Forwarding messages... */
static void
forward_attached (CamelFolder *folder, GPtrArray *messages, CamelMimePart *part, char *subject, const char *fromuri)
{
    EMsgComposer *composer;
    
    composer = create_new_composer (subject, fromuri);
    if (composer == NULL)
        return;

    e_msg_composer_attach (composer, part);
    e_msg_composer_unset_changed (composer);
    e_msg_composer_drop_editor_undo (composer);
    
    gtk_widget_show (GTK_WIDGET (composer));
}

static void
forward_attached_cb (CamelFolder *folder, GPtrArray *messages, CamelMimePart *part, char *subject, void *user_data)
{
    if (part)
        forward_attached(folder, messages, part, subject, (char *)user_data);
    g_free(user_data);
}

/**
 * em_utils_forward_attached:
 * @folder: folder containing messages to forward
 * @uids: uids of messages to forward
 * @fromuri: from folder uri
 *
 * 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.
 **/
void
em_utils_forward_attached (CamelFolder *folder, GPtrArray *uids, const char *fromuri)
{
    g_return_if_fail (CAMEL_IS_FOLDER (folder));
    g_return_if_fail (uids != NULL);
    
    mail_build_attachment (folder, uids, forward_attached_cb, g_strdup(fromuri));
}

static void
forward_non_attached (GPtrArray *messages, int style, const char *fromuri)
{
    CamelMimeMessage *message;
    EMsgComposer *composer;
    char *subject, *text;
    int i;
    guint32 flags;

    if (messages->len == 0)
        return;

    flags = EM_FORMAT_QUOTE_HEADERS;
    if (style == MAIL_CONFIG_FORWARD_QUOTED)
        flags |= EM_FORMAT_QUOTE_CITE;

    for (i = 0; i < messages->len; i++) {
        ssize_t len;

        message = messages->pdata[i];
        subject = mail_tool_generate_forward_subject (message);
        
        text = em_utils_message_to_html (message, _("-------- Forwarded Message --------"), flags, &len, NULL);
        
        if (text) {
            composer = create_new_composer (subject, fromuri);

            if (composer) {
                if (CAMEL_IS_MULTIPART(camel_medium_get_content_object((CamelMedium *)message)))
                    e_msg_composer_add_message_attachments(composer, message, FALSE);

                e_msg_composer_set_body_text (composer, text, len);
                e_msg_composer_unset_changed (composer);
                e_msg_composer_drop_editor_undo (composer);
            
                gtk_widget_show (GTK_WIDGET (composer));
            }
            g_free (text);
        }
        
        g_free (subject);
    }
}

static void
forward_inline (CamelFolder *folder, GPtrArray *uids, GPtrArray *messages, void *user_data)
{
    forward_non_attached (messages, MAIL_CONFIG_FORWARD_INLINE, (char *)user_data);
    g_free(user_data);
}

/**
 * em_utils_forward_inline:
 * @folder: folder containing messages to forward
 * @uids: uids of messages to forward
 * @fromuri: from folder/account uri
 *
 * Forwards each message in the 'inline' form, each in its own composer window.
 **/
void
em_utils_forward_inline (CamelFolder *folder, GPtrArray *uids, const char *fromuri)
{
    g_return_if_fail (CAMEL_IS_FOLDER (folder));
    g_return_if_fail (uids != NULL);
    
    mail_get_messages (folder, uids, forward_inline, g_strdup(fromuri));
}

static void
forward_quoted (CamelFolder *folder, GPtrArray *uids, GPtrArray *messages, void *user_data)
{
    forward_non_attached (messages, MAIL_CONFIG_FORWARD_QUOTED, (char *)user_data);
    g_free(user_data);
}

/**
 * em_utils_forward_quoted:
 * @folder: folder containing messages to forward
 * @uids: uids of messages to forward
 * @fromuri: from folder uri
 *
 * Forwards each message in the 'quoted' form (each line starting with
 * a "> "), each in its own composer window.
 **/
void
em_utils_forward_quoted (CamelFolder *folder, GPtrArray *uids, const char *fromuri)
{
    g_return_if_fail (CAMEL_IS_FOLDER (folder));
    g_return_if_fail (uids != NULL);
    
    mail_get_messages (folder, uids, forward_quoted, g_strdup(fromuri));
}

/**
 * em_utils_forward_message:
 * @parent: parent window
 * @message: message to be forwarded
 * @fromuri: from folder uri
 *
 * Forwards a message in the user's configured default style.
 **/
void
em_utils_forward_message (CamelMimeMessage *message, const char *fromuri)
{
    GPtrArray *messages;
    CamelMimePart *part;
    GConfClient *gconf;
    char *subject;
    int mode;
    
    messages = g_ptr_array_new ();
    g_ptr_array_add (messages, message);
    
    gconf = mail_config_get_gconf_client ();
    mode = gconf_client_get_int (gconf, "/apps/evolution/mail/format/forward_style", NULL);
    
    switch (mode) {
    case MAIL_CONFIG_FORWARD_ATTACHED:
    default:
        part = mail_tool_make_message_attachment (message);
        
        subject = mail_tool_generate_forward_subject (message);
        
        forward_attached (NULL, messages, part, subject, fromuri);
        camel_object_unref (part);
        g_free (subject);
        break;
    case MAIL_CONFIG_FORWARD_INLINE:
        forward_non_attached (messages, MAIL_CONFIG_FORWARD_INLINE, fromuri);
        break;
    case MAIL_CONFIG_FORWARD_QUOTED:
        forward_non_attached (messages, MAIL_CONFIG_FORWARD_QUOTED, fromuri);
        break;
    }
    
    g_ptr_array_free (messages, TRUE);
}

/**
 * em_utils_forward_messages:
 * @folder: folder containing messages to forward
 * @uids: uids of messages to forward
 *
 * Forwards a group of messages in the user's configured default
 * style.
 **/
void
em_utils_forward_messages (CamelFolder *folder, GPtrArray *uids, const char *fromuri)
{
    GConfClient *gconf;
    int mode;
    
    gconf = mail_config_get_gconf_client ();
    mode = gconf_client_get_int (gconf, "/apps/evolution/mail/format/forward_style", NULL);
    
    switch (mode) {
    case MAIL_CONFIG_FORWARD_ATTACHED:
    default:
        em_utils_forward_attached (folder, uids, fromuri);
        break;
    case MAIL_CONFIG_FORWARD_INLINE:
        em_utils_forward_inline (folder, uids, fromuri);
        break;
    case MAIL_CONFIG_FORWARD_QUOTED:
        em_utils_forward_quoted (folder, uids, fromuri);
        break;
    }
}

/* Redirecting messages... */

static EMsgComposer *
redirect_get_composer (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");
    
    account = guess_account (message, NULL);
    
    composer = e_msg_composer_new_redirect (message, account ? account->name : NULL);
    
    em_composer_utils_setup_default_callbacks (composer);
    
    return composer;
}

/**
 * em_utils_redirect_message:
 * @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 (CamelMimeMessage *message)
{
    EMsgComposer *composer;
    
    g_return_if_fail (CAMEL_IS_MIME_MESSAGE (message));
    
    composer = redirect_get_composer (message);
    
    gtk_widget_show (GTK_WIDGET (composer));
    e_msg_composer_unset_changed (composer);
    e_msg_composer_drop_editor_undo (composer);
}

static void
redirect_msg (CamelFolder *folder, const char *uid, CamelMimeMessage *message, void *user_data)
{
    if (message == NULL)
        return;
    
    em_utils_redirect_message (message);
}

/**
 * em_utils_redirect_message_by_uid:
 * @folder: folder containing message to be redirected
 * @uid: uid of message to be redirected
 *
 * Opens a composer to redirect the message (Note: only headers will
 * be editable). Adds Resent-From/Resent-To/etc headers.
 **/
void
em_utils_redirect_message_by_uid (CamelFolder *folder, const char *uid)
{
    g_return_if_fail (CAMEL_IS_FOLDER (folder));
    g_return_if_fail (uid != NULL);
    
    mail_get_message (folder, uid, redirect_msg, NULL, mail_thread_new);
}

static void
emu_handle_receipt_message(CamelFolder *folder, const char *uid, CamelMimeMessage *msg, void *data, CamelException *ex)
{
    if (msg)
        em_utils_handle_receipt(folder, uid, msg);

    /* we dont care really if we can't get the message */
    camel_exception_clear(ex);
}

/* Message disposition notifications, rfc 2298 */
void
em_utils_handle_receipt (CamelFolder *folder, const char *uid, CamelMimeMessage *msg)
{
    EAccount *account;
    const char *addr;
    CamelMessageInfo *info;

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

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

    if (msg == NULL) {
        mail_get_messagex(folder, uid, emu_handle_receipt_message, NULL, mail_thread_new);
        camel_message_info_free(info);
        return;
    }

    if ((addr = camel_medium_get_header((CamelMedium *)msg, "Disposition-Notification-To")) == NULL) {
        camel_message_info_free(info);
        return;
    }

    camel_message_info_set_user_flag(info, "receipt-handled", TRUE);
    camel_message_info_free(info);
    
    account = guess_account(msg, folder);

    /* TODO: should probably decode/format the address, it could be in rfc2047 format */
    if (addr == NULL) {
        addr = "";
    } else {
        while (camel_mime_is_lwsp(*addr))
            addr++;
    }
    
    if (account && (account->receipt_policy == E_ACCOUNT_RECEIPT_ALWAYS || account->receipt_policy == E_ACCOUNT_RECEIPT_ASK)
        && e_error_run (NULL, "mail:ask-receipt", addr, camel_mime_message_get_subject(msg)) == GTK_RESPONSE_YES)
        em_utils_send_receipt(folder, msg);
}

static void
em_utils_receipt_done (CamelFolder *folder, CamelMimeMessage *msg, CamelMessageInfo *info,
               int queued, const char *appended_uid, void *data)
{
    camel_message_info_free (info);
    mail_send ();
}


void
em_utils_send_receipt (CamelFolder *folder, CamelMimeMessage *message)
{
    /* See RFC #2298 for a description of message receipts */
    EAccount *account = guess_account (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 char *message_id = camel_medium_get_header (CAMEL_MEDIUM (message), "Message-ID");
    const char *message_date = camel_medium_get_header (CAMEL_MEDIUM (message), "Date");
    const char *message_subject = camel_mime_message_get_subject (message);
    const char *receipt_address = camel_medium_get_header (CAMEL_MEDIUM (message), "Disposition-Notification-To");
    char *fake_msgid;
    char *hostname;
    char *self_address, *receipt_subject;
    char *ua, *recipient;

    if (!receipt_address)
        return;
    
    /* 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_data_wrapper_set_mime_type_field (receipt_text, type);
    camel_content_type_unref (type);
    stream = camel_stream_mem_new ();
    camel_stream_printf (stream,
                 "Your message to %s about \"%s\" on %s has been read.",
                 self_address, message_subject, message_date);
    camel_data_wrapper_construct_from_stream (receipt_text, stream);
    camel_object_unref (stream);
    
    part = camel_mime_part_new ();
    camel_medium_set_content_object (CAMEL_MEDIUM (part), receipt_text);
    camel_object_unref (receipt_text);
    camel_multipart_add_part (body, part);
    camel_object_unref (part);  
    
    /* Create the machine-readable receipt */
    receipt_data = camel_data_wrapper_new ();
    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 ();
    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);   

    camel_medium_add_header (CAMEL_MEDIUM (part), "Reporting-UA", ua);
    camel_medium_add_header (CAMEL_MEDIUM (part), "Final-Recipient", recipient);
    camel_medium_add_header (CAMEL_MEDIUM (part), "Original-Message-ID", message_id);
    camel_medium_add_header (CAMEL_MEDIUM (part), "Disposition", "manual-action/MDN-sent-manually; displayed");

    g_free (ua);
    g_free (recipient);
    g_free (fake_msgid);
    
    camel_data_wrapper_construct_from_stream (receipt_data, stream);
    camel_object_unref (stream);
    camel_medium_set_content_object (CAMEL_MEDIUM (part), receipt_data);
    camel_object_unref (receipt_data);
    camel_multipart_add_part (body, part);
    camel_object_unref (part);  
    
    /* Finish creating the message */
    camel_medium_set_content_object (CAMEL_MEDIUM (receipt), CAMEL_DATA_WRAPPER (body));
    camel_object_unref (body);
    
    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);
    camel_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);
    camel_object_unref (addr);

    camel_medium_set_header (CAMEL_MEDIUM (receipt), "Return-Path", "<>");

    /* Send the receipt */
    out_folder = mail_component_get_folder(NULL, MAIL_COMPONENT_FOLDER_OUTBOX);
    info = camel_message_info_new (NULL);
    camel_message_info_set_flags (info, CAMEL_MESSAGE_SEEN, CAMEL_MESSAGE_SEEN);
    mail_append_mail (out_folder, receipt, info, em_utils_receipt_done, 0);
}

/* Replying to messages... */

static GHashTable *
generate_account_hash (void)
{
    GHashTable *account_hash;
    EAccount *account, *def;
    EAccountList *accounts;
    EIterator *iter;
    
    accounts = mail_config_get_accounts ();
    account_hash = g_hash_table_new (camel_strcase_hash, camel_strcase_equal);
    
    def = mail_config_get_default_account ();
    
    iter = e_list_get_iterator ((EList *) accounts);
    while (e_iterator_is_valid (iter)) {
        account = (EAccount *) e_iterator_get (iter);
        
        if (account->id->address) {
            EAccount *acnt;
            
            /* Accounts with identical email addresses that are enabled
             * take precedence over the accounts that aren't. If all
             * accounts with matching email addresses are disabled, then
             * the first one in the list takes precedence. The default
             * account always takes precedence no matter what.
             */
            acnt = g_hash_table_lookup (account_hash, account->id->address);
            if (acnt && acnt != def && !acnt->enabled && account->enabled) {
                g_hash_table_remove (account_hash, acnt->id->address);
                acnt = NULL;
            }
            
            if (!acnt)
                g_hash_table_insert (account_hash, (char *) account->id->address, (void *) account);
        }
        
        e_iterator_next (iter);
    }
    
    g_object_unref (iter);

    /* The default account has to be there if none of the enabled accounts are present */
    if (g_hash_table_size (account_hash) == 0 && def && def->id->address)
        g_hash_table_insert (account_hash, (char *) def->id->address, (void *) def);
    
    return account_hash;
}

static EDestination **
em_utils_camel_address_to_destination (CamelInternetAddress *iaddr)
{
    EDestination *dest, **destv;
    int 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 char *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 (CamelMimeMessage *message, EAccount *account,
            CamelInternetAddress *to, CamelInternetAddress *cc,
            CamelFolder *folder, CamelNNTPAddress *postto)
{
    const char *message_id, *references;
    EDestination **tov, **ccv;
    EMsgComposer *composer;
    char *subject;
    
    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);

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

    if (tov || ccv) {
        if (postto && camel_address_length((CamelAddress *)postto))
            composer = e_msg_composer_new_with_type (E_MSG_COMPOSER_MAIL_POST);
        else
            composer = e_msg_composer_new_with_type (E_MSG_COMPOSER_MAIL);
    } else
        composer = e_msg_composer_new_with_type (E_MSG_COMPOSER_POST);

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

    e_msg_composer_set_headers (composer, account ? account->name : NULL, tov, ccv, NULL, subject);
    
    g_free (subject);
    
    /* add post-to, if nessecary */
    if (postto && camel_address_length((CamelAddress *)postto)) {
        char *store_url = NULL;
        char *post;

        if (folder) {
            store_url = camel_url_to_string (CAMEL_SERVICE (folder->parent_store)->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_msg_composer_hdrs_set_post_to_base (e_msg_composer_get_hdrs(composer), 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) {
        char *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);
    }
    
    e_msg_composer_drop_editor_undo (composer);
    
    return composer;
}

static EAccount *
guess_account_folder(CamelFolder *folder)
{
    EAccount *account;
    char *tmp;

    tmp = camel_url_to_string(CAMEL_SERVICE(folder->parent_store)->url, CAMEL_URL_HIDE_ALL);
    account = mail_config_get_account_by_source_url(tmp);
    g_free(tmp);

    return account;
}

static EAccount *
guess_account (CamelMimeMessage *message, CamelFolder *folder)
{
    GHashTable *account_hash = NULL;
    EAccount *account = NULL;
    const char *tmp;
    int i, j;
    char *types[2] = { CAMEL_RECIPIENT_TYPE_TO, CAMEL_RECIPIENT_TYPE_CC };

    /* check for newsgroup header */
    if (folder
        && camel_medium_get_header((CamelMedium *)message, "Newsgroups")
        && (account = guess_account_folder(folder)))
        return account;

    /* then recipient (to/cc) in account table */
    account_hash = generate_account_hash ();
    for (j=0;account == NULL && j<2;j++) {
        const CamelInternetAddress *to;
        
        to = camel_mime_message_get_recipients(message, types[j]);
        if (to) {
            for (i = 0; camel_internet_address_get(to, i, NULL, &tmp); i++) {
                account = g_hash_table_lookup(account_hash, tmp);
                if (account && account->enabled)
                    break;
            }
        }
    }
    g_hash_table_destroy(account_hash);

    /* then message source */
    if (account == NULL
        && (tmp = camel_mime_message_get_source(message)))
        account = mail_config_get_account_by_source_url(tmp);

    /* and finally, source folder */
    if (account == NULL
        && folder)
        account = guess_account_folder(folder);

    return account;
}

static void
get_reply_sender (CamelMimeMessage *message, CamelInternetAddress *to, CamelNNTPAddress *postto)
{
    const CamelInternetAddress *reply_to;
    const char *name, *addr, *posthdr;
    int 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 = camel_mime_message_get_reply_to (message);
    if (!reply_to)
        reply_to = camel_mime_message_get_from (message);
    
    if (reply_to) {
        for (i = 0; camel_internet_address_get (reply_to, i, &name, &addr); i++)
            camel_internet_address_add (to, name, addr);
    }
}

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

static void
concat_unique_addrs (CamelInternetAddress *dest, const CamelInternetAddress *src, GHashTable *rcpt_hash)
{
    const char *name, *addr;
    int 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, (char *) addr, GINT_TO_POINTER (1));
        }
    }
}

static void
get_reply_all (CamelMimeMessage *message, CamelInternetAddress *to, CamelInternetAddress *cc, CamelNNTPAddress *postto)
{
    const CamelInternetAddress *reply_to, *to_addrs, *cc_addrs;
    const char *name, *addr, *posthdr;
    GHashTable *rcpt_hash;
    int 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 = generate_account_hash ();
    
    reply_to = camel_mime_message_get_reply_to (message);
    if (!reply_to)
        reply_to = camel_mime_message_get_from (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, (char *) 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);
}

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 char *attr, CamelMimeMessage *message);

static void
format_sender (GString *str, const char *attr, CamelMimeMessage *message)
{
    const CamelInternetAddress *sender;
    const char *name, *addr;
    
    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 char *name;
    int type;
    struct {
        const char *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           } }
};

/* 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 em-composer-utils.c:1514 */
#define ATTRIBUTION _("On ${AbbrevWeekdayName}, ${Year}-${Month}-${Day} at ${24Hour}:${Minute} ${TimeZone}, ${Sender} wrote:")

static char *
attribution_format (const char *format, CamelMimeMessage *message)
{
    register const char *inptr;
    const char *start;
    int tzone, len, i;
    char buf[64], *s;
    GString *str;
    struct tm tm;
    time_t date;
    int type;
    
    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);
    
    start = 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);
    
    return s;
}

static void
composer_set_body (EMsgComposer *composer, CamelMimeMessage *message, EMFormat *source)
{
    char *text, *credits;
    CamelMimePart *part;
    GConfClient *gconf;
    ssize_t len;
    
    gconf = mail_config_get_gconf_client ();
    
    switch (gconf_client_get_int (gconf, "/apps/evolution/mail/format/reply_style", NULL)) {
    case MAIL_CONFIG_REPLY_DO_NOT_QUOTE:
        /* do nothing */
        break;
    case MAIL_CONFIG_REPLY_ATTACH:
        /* attach the original message as an attachment */
        part = mail_tool_make_message_attachment (message);
        e_msg_composer_attach (composer, part);
        camel_object_unref (part);
        break;
    case MAIL_CONFIG_REPLY_OUTLOOK:
        text = em_utils_message_to_html(message, _("-----Original Message-----"), EM_FORMAT_QUOTE_HEADERS, &len, source);
        e_msg_composer_set_body_text(composer, text, len);
        g_free (text);
        break;

    case MAIL_CONFIG_REPLY_QUOTED:
    default:
        /* do what any sane user would want when replying... */
        credits = attribution_format (ATTRIBUTION, message);
        text = em_utils_message_to_html(message, credits, EM_FORMAT_QUOTE_CITE, &len, source);
        g_free (credits);
        e_msg_composer_set_body_text(composer, text, len);
        g_free (text);
        break;
    }
    
    e_msg_composer_drop_editor_undo (composer);
}

struct _reply_data {
    EMFormat *source;
    int mode;
};

static void
reply_to_message(CamelFolder *folder, const char *uid, CamelMimeMessage *message, void *user_data)
{
    struct _reply_data *rd = user_data;

    if (message != NULL)
        em_utils_reply_to_message(folder, uid, message, rd->mode, rd->source);

    if (rd->source)
        g_object_unref(rd->source);
    g_free(rd);
}

/**
 * em_utils_reply_to_message:
 * @folder: optional folder
 * @uid: optional uid
 * @message: message to reply to, optional
 * @mode: reply mode
 * @source: source to inherit view settings from
 *
 * Creates a new composer ready to reply to @message.
 *
 * If @message is NULL then @folder and @uid must be set to the
 * message to be replied to, it will be loaded asynchronously.
 *
 * If @message is non null, then it is used directly, @folder and @uid
 * may be supplied in order to update the message flags once it has
 * been replied to.
 **/
void
em_utils_reply_to_message(CamelFolder *folder, const char *uid, CamelMimeMessage *message, int mode, EMFormat *source)
{
    CamelInternetAddress *to, *cc;
    CamelNNTPAddress *postto = NULL;
    EMsgComposer *composer;
    EAccount *account;
    guint32 flags;
    EMEvent *eme;
    EMEventTargetMessage *target;

    if (folder && uid && message == NULL) {
        struct _reply_data *rd = g_malloc0(sizeof(*rd));

        rd->mode = mode;
        rd->source = source;
        if (rd->source)
            g_object_ref(rd->source);
        mail_get_message(folder, uid, reply_to_message, rd, mail_thread_new);

        return;
    }

    g_return_if_fail(message != NULL);

    /** @Event: message.replying
     * @Title: Message being replied to
     * @Target: EMEventTargetMessage
     * 
     * message.replying is emitted when a user starts replying to a message.
     */

    eme = em_event_peek();
    target = em_event_target_new_message(eme, folder, message, uid,
                         mode == REPLY_MODE_ALL ? EM_EVENT_MESSAGE_REPLY_ALL : 0);
    e_event_emit((EEvent *)eme, "message.replying", (EEventTarget *)target);

    to = camel_internet_address_new();
    cc = camel_internet_address_new();
    
    account = guess_account (message, folder);
    flags = CAMEL_MESSAGE_ANSWERED | CAMEL_MESSAGE_SEEN;
    
    switch (mode) {
    case REPLY_MODE_SENDER:
        if (folder)
            postto = camel_nntp_address_new();

        get_reply_sender (message, to, postto);
        break;
    case REPLY_MODE_LIST:
        flags |= CAMEL_MESSAGE_ANSWERED_ALL;
        if (get_reply_list (message, to))
            break;
        /* falls through */
    case REPLY_MODE_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 (message, account, to, cc, folder, postto);
    e_msg_composer_add_message_attachments (composer, message, TRUE);

    if (postto)
        camel_object_unref(postto);
    camel_object_unref(to);
    camel_object_unref(cc);
    
    composer_set_body (composer, message, source);
    
    em_composer_utils_setup_callbacks (composer, folder, uid, flags, flags, NULL, NULL);
    
    gtk_widget_show (GTK_WIDGET (composer));
    e_msg_composer_unset_changed (composer);
}

/* Posting replies... */

static void
post_reply_to_message (CamelFolder *folder, const char *uid, CamelMimeMessage *message, void *user_data)
{
    /* FIXME: would be nice if this shared more code with reply_get_composer() */
    const char *message_id, *references;
    CamelInternetAddress *to;
    EDestination **tov = NULL;
    CamelFolder *real_folder;
    EMsgComposer *composer;
    char *subject, *url;
    EAccount *account;
    char *real_uid;
    guint32 flags;
    
    if (message == NULL)
        return;
    
    if (CAMEL_IS_VEE_FOLDER (folder)) {
        CamelMessageInfo *info;
        
        info = camel_folder_get_message_info (folder, uid);
        real_folder = camel_vee_folder_get_location ((CamelVeeFolder *) folder, (struct _CamelVeeMessageInfo *) info, &real_uid);
        camel_folder_free_message_info (folder, info);
    } else {
        real_folder = folder;
        camel_object_ref (folder);
        real_uid = g_strdup (uid);
    }
    
    account = guess_account (message, real_folder);
    flags = CAMEL_MESSAGE_ANSWERED | CAMEL_MESSAGE_SEEN;
    
    to = camel_internet_address_new();
    get_reply_sender (message, to, NULL);
    
    composer = e_msg_composer_new_with_type (E_MSG_COMPOSER_MAIL_POST);
    
    /* construct the tov/ccv */
    tov = em_utils_camel_address_to_destination (to);
    
    /* Set the subject of the new message. */
    if ((subject = (char *) camel_mime_message_get_subject (message))) {
        if (g_ascii_strncasecmp (subject, "Re: ", 4) != 0)
            subject = g_strdup_printf ("Re: %s", subject);
        else
            subject = g_strdup (subject);
    } else {
        subject = g_strdup ("");
    }
    
    e_msg_composer_set_headers (composer, account ? account->name : NULL, tov, NULL, NULL, subject);
    
    g_free (subject);
    
    url = mail_tools_folder_to_url (real_folder);
    e_msg_composer_hdrs_set_post_to (e_msg_composer_get_hdrs(composer), url);
    g_free (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) {
        char *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);
    }
    
    e_msg_composer_drop_editor_undo (composer);
    
    e_msg_composer_add_message_attachments (composer, message, TRUE);
    
    composer_set_body (composer, message, NULL);
    
    em_composer_utils_setup_callbacks (composer, real_folder, real_uid, flags, flags, NULL, NULL);
    
    gtk_widget_show (GTK_WIDGET (composer));    
    e_msg_composer_unset_changed (composer);
    
    camel_object_unref (real_folder);
    camel_object_unref(to);
    g_free (real_uid);
}

/**
 * em_utils_post_reply_to_message_by_uid:
 * @folder: folder containing message to reply to
 * @uid: message uid
 * @mode: reply mode
 *
 * Creates a new composer (post mode) ready to reply to the message
 * referenced by @folder and @uid.
 **/
void
em_utils_post_reply_to_message_by_uid (CamelFolder *folder, const char *uid)
{
    g_return_if_fail (CAMEL_IS_FOLDER (folder));
    g_return_if_fail (uid != NULL);
    
    mail_get_message (folder, uid, post_reply_to_message, NULL, mail_thread_new);
}