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/*
 *
 * 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:
 *      Chenthill Palanisamy <pchenthill@novell.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <string.h>
#include <glib.h>
#include <gtk/gtk.h>
#include <glib/gi18n.h>
#include <e-util/e-plugin-ui.h>
#include <mail/em-folder-tree.h>
#include <mail/em-utils.h>
#include <mail/mail-ops.h>
#include <mail/mail-mt.h>

#include <shell/e-shell-sidebar.h>
#include <shell/e-shell-view.h>
#include <shell/e-shell-window.h>

#define PRIMARY_TEXT \
    N_("Also mark messages in subfolders?")
#define SECONDARY_TEXT \
    N_("Do you want to mark messages as read in the current folder " \
       "only, or in the current folder as well as all subfolders?")

enum {
    MARK_ALL_READ_CANCEL,
    MARK_ALL_READ_CURRENT_FOLDER,
    MARK_ALL_READ_WITH_SUBFOLDERS
};

gboolean    e_plugin_ui_init        (GtkUIManager *ui_manager,
                         EShellView *shell_view);
gint e_plugin_lib_enable (EPlugin *ep, gint enable);

gint
e_plugin_lib_enable (EPlugin *ep, gint enable)
{
    return 0;
}

static void
button_clicked_cb (GtkButton *button,
                   GtkDialog *dialog)
{
    gpointer response;

    response = g_object_get_data (G_OBJECT (button), "response");
    gtk_dialog_response (dialog, GPOINTER_TO_INT (response));
}

static void
box_mapped_cb (GtkWidget *box,
               GtkWidget *label)
{
    GtkRequisition requisition;

    /* In order to get decent line wrapping we need to wait until the
     * box containing the buttons is mapped, and then resize the label
     * to the same width as the box. */
    gtk_widget_size_request (box, &requisition);
    gtk_widget_set_size_request (label, requisition.width, -1);
}

static gint
prompt_user (gboolean has_subfolders)
{
    GtkWidget *container;
    GtkWidget *dialog;
    GtkWidget *label1;
    GtkWidget *label2;
    GtkWidget *table;
    GtkWidget *widget;
    GtkWidget *vbox;
    gchar *markup;
    gint response, ret;

    if (!has_subfolders) {
        EShell *shell;
        GtkWindow *parent;

        shell = e_shell_get_default ();
        parent = e_shell_get_active_window (shell);

        return em_utils_prompt_user (
            parent, NULL, "mail:ask-mark-all-read", NULL) ?
            MARK_ALL_READ_CURRENT_FOLDER : MARK_ALL_READ_CANCEL;
    }

    dialog = gtk_dialog_new ();
    widget = gtk_dialog_get_action_area (GTK_DIALOG (dialog));
    gtk_widget_hide (widget);
#if !GTK_CHECK_VERSION(2,90,7)
    g_object_set (dialog, "has-separator", FALSE, NULL);
#endif
    gtk_window_set_title (GTK_WINDOW (dialog), "");
    g_signal_connect (
        dialog, "map",
        G_CALLBACK (gtk_widget_queue_resize), NULL);
    gtk_container_set_border_width (GTK_CONTAINER (dialog), 12);
    vbox = gtk_dialog_get_content_area (GTK_DIALOG (dialog));

    /* Table */
    widget = gtk_table_new (3, 2, FALSE);
    gtk_table_set_row_spacings (GTK_TABLE (widget), 12);
    gtk_table_set_col_spacings (GTK_TABLE (widget), 12);
    gtk_box_pack_start (GTK_BOX (vbox), widget, TRUE, TRUE, 0);
    gtk_widget_show (widget);

    table = widget;

    /* Question Icon */
    widget = gtk_image_new_from_stock (
        GTK_STOCK_DIALOG_QUESTION, GTK_ICON_SIZE_DIALOG);
    gtk_misc_set_alignment (GTK_MISC (widget), 0.5, 0.0);
    gtk_table_attach (
        GTK_TABLE (table), widget, 0, 1, 0, 3,
        0, GTK_EXPAND | GTK_FILL, 0, 0);
    gtk_widget_show (widget);

    /* Primary Text */
    markup = g_markup_printf_escaped (
        "<big><b>%s</b></big>", gettext (PRIMARY_TEXT));
    widget = gtk_label_new (markup);
    gtk_label_set_line_wrap (GTK_LABEL (widget), TRUE);
    gtk_label_set_use_markup (GTK_LABEL (widget), TRUE);
    gtk_misc_set_alignment (GTK_MISC (widget), 0.0, 0.0);
    gtk_table_attach (
        GTK_TABLE (table), widget, 1, 2, 0, 1,
        0, 0, 0, 0);
    gtk_widget_show (widget);
    g_free (markup);
    label1 = widget;

    /* Secondary Text */
    widget = gtk_label_new (gettext (SECONDARY_TEXT));
    gtk_label_set_line_wrap (GTK_LABEL (widget), TRUE);
    gtk_misc_set_alignment (GTK_MISC (widget), 0.0, 0.0);
    gtk_table_attach (
        GTK_TABLE (table), widget, 1, 2, 1, 2,
        0, GTK_EXPAND | GTK_FILL, 0, 0);
    gtk_widget_show (widget);
    label2 = widget;

    /* Action Area */
    widget = gtk_hbox_new (FALSE, 6);
    g_signal_connect (
        widget, "map",
        G_CALLBACK (box_mapped_cb), label1);
    g_signal_connect (
        widget, "map",
        G_CALLBACK (box_mapped_cb), label2);
    gtk_table_attach (
        GTK_TABLE (table), widget, 1, 2, 2, 3,
        GTK_EXPAND | GTK_FILL, 0, 0, 0);
    gtk_widget_show (widget);

    container = widget;

    /* Cancel button */
    widget = gtk_button_new_from_stock (GTK_STOCK_CANCEL);
    g_object_set_data (
        G_OBJECT (widget), "response",
        GINT_TO_POINTER (GTK_RESPONSE_CANCEL));
    g_signal_connect (
        widget, "clicked",
        G_CALLBACK (button_clicked_cb), dialog);
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
    gtk_widget_show (widget);

    /* To Translators: It's a response button caption on a question
       "Do you want to mark messages as read in the current folder
       only, or in the current folder as well as all subfolders?" */
    widget = gtk_button_new_with_mnemonic (
        _("In Current Folder and _Subfolders"));
    g_object_set_data (
        G_OBJECT (widget), "response",
        GINT_TO_POINTER (GTK_RESPONSE_YES));
    g_signal_connect (
        widget, "clicked",
        G_CALLBACK (button_clicked_cb), dialog);
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
    gtk_widget_show (widget);

    /* To Translators: It's a response button caption on a question
       "Do you want to mark messages as read in the current folder
       only, or in the current folder as well as all subfolders?" */
    widget = gtk_button_new_with_mnemonic (
        _("In Current _Folder Only"));
    g_object_set_data (
        G_OBJECT (widget), "response",
        GINT_TO_POINTER (GTK_RESPONSE_NO));
    g_signal_connect (
        widget, "clicked",
        G_CALLBACK (button_clicked_cb), dialog);
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
    gtk_widget_show (widget);

    response = gtk_dialog_run (GTK_DIALOG (dialog));

    gtk_widget_destroy (dialog);

    if (response == GTK_RESPONSE_YES)
        ret = MARK_ALL_READ_WITH_SUBFOLDERS;
    else if (response == GTK_RESPONSE_NO)
        ret = MARK_ALL_READ_CURRENT_FOLDER;
    else
        ret = MARK_ALL_READ_CANCEL;

    return ret;
}

static gboolean
scan_folder_tree_for_unread_helper (GtkTreeModel *model,
                                    GtkTreeIter *iter,
                                    GtkTreePath *path,
                                    gint initial_depth,
                                    gint *relative_depth)
{
    /* This is based on gtk_tree_model_foreach().  Unfortunately
     * that function insists on traversing the entire tree model. */

    do {
        GtkTreeIter child;
        gboolean folder_has_unread;
        gboolean is_draft = FALSE;
        gboolean is_store = FALSE;
        guint unread = 0;

        gtk_tree_model_get (
            model, iter,
            COL_UINT_UNREAD, &unread,
            COL_BOOL_IS_STORE, &is_store,
            COL_BOOL_IS_DRAFT, &is_draft, -1);

        folder_has_unread =
            !is_store && !is_draft &&
            unread > 0 && unread != ~((guint) 0);

        if (folder_has_unread) {
            gint current_depth;

            current_depth = gtk_tree_path_get_depth (path);
            *relative_depth = current_depth - initial_depth + 1;

            /* If we find unread messages in a child of the
             * selected folder, short-circuit the recursion. */
            if (*relative_depth > 1)
                return TRUE;
        }

        if (gtk_tree_model_iter_children (model, &child, iter)) {
            gtk_tree_path_down (path);

            if (scan_folder_tree_for_unread_helper (
                model, &child, path,
                initial_depth, relative_depth))
                return TRUE;

            gtk_tree_path_up (path);
        }

        gtk_tree_path_next (path);

    } while (gtk_tree_model_iter_next (model, iter));

    return FALSE;
}

static gint
scan_folder_tree_for_unread (const gchar *folder_uri)
{
    GtkTreeRowReference *reference;
    EMFolderTreeModel *model;
    gint relative_depth = 0;

    /* Traverses the selected folder and its children and returns
     * the relative depth of the furthest child folder containing
     * unread mail.  Except, we abort the traversal as soon as we
     * find a child folder with unread messages.  So the possible
     * return values are:
     *
     *    Depth = 0:  No unread mail found.
     *    Depth = 1:  Unread mail only in selected folder.
     *    Depth = 2:  Unread mail in one of the child folders.
     */

    if (folder_uri == NULL)
        return 0;

    model = em_folder_tree_model_get_default ();
    reference = em_folder_tree_model_lookup_uri (model, folder_uri);

    if (gtk_tree_row_reference_valid (reference)) {
        GtkTreePath *path;
        GtkTreeIter iter;

        path = gtk_tree_row_reference_get_path (reference);
        gtk_tree_model_get_iter (GTK_TREE_MODEL (model), &iter, path);

        scan_folder_tree_for_unread_helper (
            GTK_TREE_MODEL (model), &iter, path,
            gtk_tree_path_get_depth (path), &relative_depth);

        gtk_tree_path_free (path);
    }

    return relative_depth;
}

static void
mark_all_as_read (CamelFolder *folder)
{
    GPtrArray *uids;
    gint i;

    uids =  camel_folder_get_uids (folder);
    camel_folder_freeze (folder);
    for (i=0;i<uids->len;i++)
        camel_folder_set_message_flags (
            folder, uids->pdata[i],
            CAMEL_MESSAGE_SEEN, CAMEL_MESSAGE_SEEN);
    camel_folder_thaw (folder);
    camel_folder_free_uids (folder, uids);
}

static gboolean
mar_all_sub_folders (CamelStore *store,
                     CamelFolderInfo *fi,
                     GCancellable *cancellable,
                     GError **error)
{
    while (fi) {
        CamelFolder *folder;

        if (fi->child) {
            if (!mar_all_sub_folders (
                store, fi->child, cancellable, error))
                return FALSE;
        }

        folder = camel_store_get_folder_sync (
            store, fi->full_name, 0, cancellable, error);
        if (folder == NULL)
            return FALSE;

        if (!CAMEL_IS_VEE_FOLDER (folder))
            mark_all_as_read (folder);

        fi = fi->next;
    }

    return TRUE;
}

static void
mar_got_folder (gchar *folder_uri,
                CamelFolder *folder,
                gpointer data)
{
    CamelFolderInfo *folder_info;
    CamelStore *parent_store;
    const gchar *full_name;
    gint response;

    /* FIXME we have to disable the menu item */
    if (!folder)
        return;

    full_name = camel_folder_get_full_name (folder);
    parent_store = camel_folder_get_parent_store (folder);

    /* FIXME Not passing a GCancellable or GError here. */
    folder_info = camel_store_get_folder_info_sync (
        parent_store, full_name,
        CAMEL_STORE_FOLDER_INFO_RECURSIVE |
        CAMEL_STORE_FOLDER_INFO_FAST, NULL, NULL);

    if (folder_info == NULL)
        goto exit;

    response = prompt_user (folder_info->child != NULL);

    if (response == MARK_ALL_READ_CANCEL)
        return;

    if (response == MARK_ALL_READ_CURRENT_FOLDER)
        mark_all_as_read (folder);
    else if (response == MARK_ALL_READ_WITH_SUBFOLDERS)
        /* FIXME Not passing a GCancellable or GError here. */
        mar_all_sub_folders (parent_store, folder_info, NULL, NULL);

exit:
    camel_store_free_folder_info (parent_store, folder_info);
}

static void
action_mail_mark_read_recursive_cb (GtkAction *action,
                                    EShellView *shell_view)
{
    EShellSidebar *shell_sidebar;
    EMFolderTree *folder_tree;
    EMailSession *session;
    gchar *folder_uri;

    shell_sidebar = e_shell_view_get_shell_sidebar (shell_view);
    g_object_get (shell_sidebar, "folder-tree", &folder_tree, NULL);

    session = em_folder_tree_get_session (folder_tree);

    folder_uri = em_folder_tree_get_selected_uri (folder_tree);
    g_return_if_fail (folder_uri != NULL);

    mail_get_folder (
        session, folder_uri, 0, mar_got_folder,
        NULL, mail_msg_unordered_push);

    g_object_unref (folder_tree);
    g_free (folder_uri);
}

static GtkActionEntry entries[] = {

    { "mail-mark-read-recursive",
      "mail-mark-read",
      N_("Mark Me_ssages as Read"),
      NULL,
      NULL,  /* XXX Add a tooltip! */
      G_CALLBACK (action_mail_mark_read_recursive_cb) }
};

static void
update_actions_cb (EShellView *shell_view,
                   gpointer user_data)
{
    GtkActionGroup *action_group;
    EShellSidebar *shell_sidebar;
    EShellWindow *shell_window;
    EMFolderTree *folder_tree;
    GtkAction *action;
    gchar *folder_uri;
    gboolean visible;

    g_return_if_fail (E_IS_SHELL_VIEW (shell_view));

    shell_window = e_shell_view_get_shell_window (shell_view);
    action_group = e_shell_window_get_action_group (shell_window, "mail");

    action = gtk_action_group_get_action (action_group, entries[0].name);
    g_return_if_fail (action != NULL);

    shell_sidebar = e_shell_view_get_shell_sidebar (shell_view);
    g_object_get (shell_sidebar, "folder-tree", &folder_tree, NULL);
    folder_uri = em_folder_tree_get_selected_uri (folder_tree);

    visible = (scan_folder_tree_for_unread (folder_uri) > 0);
    gtk_action_set_visible (action, visible);

    g_object_unref (folder_tree);
    g_free (folder_uri);
}

gboolean
e_plugin_ui_init (GtkUIManager *ui_manager,
                  EShellView *shell_view)
{
    EShellWindow *shell_window;
    GtkActionGroup *action_group;

    shell_window = e_shell_view_get_shell_window (shell_view);
    action_group = e_shell_window_get_action_group (shell_window, "mail");

    /* Add actions to the "mail" action group. */
    gtk_action_group_add_actions (
        action_group, entries,
        G_N_ELEMENTS (entries), shell_view);

    g_signal_connect (
        shell_view, "update-actions",
        G_CALLBACK (update_actions_cb), NULL);

    return TRUE;
}