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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:
 *      Michael Zucchi <notzed@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

/* A plugin manager ui */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <gtk/gtk.h>
#include <glib/gi18n-lib.h>
#include <string.h>
#include <stdio.h>

#include "e-util/e-plugin.h"
#include "shell/es-menu.h"

#define d(S) (S)

enum {
    LABEL_NAME,
    LABEL_AUTHOR,
    LABEL_DESCRIPTION,
    LABEL_LAST
};

enum
{
    COL_PLUGIN_ENABLED = 0,
    COL_PLUGIN_NAME,
    COL_PLUGIN_DATA,
    COL_PLUGIN_CFG_WIDGET
};

static struct {
    const char *label;
} label_info[LABEL_LAST] = {
    { N_("Name"), },
    { N_("Author(s)"), },
    { N_("Description"), },
};

typedef struct _Manager Manager;
struct _Manager {
    GtkDialog *dialog;
    GtkTreeView *treeview;
    GtkTreeModel *model;

    GtkLabel *labels[LABEL_LAST];
    GtkLabel *items[LABEL_LAST];

    GtkWidget *config_plugin_label;
    GtkWidget *active_cfg_widget;

    GSList *plugins;
};

/* for tracking if we're shown */
static GtkDialog *dialog;
static GtkWidget *notebook;
static GtkWidget *configure_page;
static gint last_selected_page;
static gulong switch_page_handler_id;

void org_gnome_plugin_manager_manage(void *ep, ESMenuTargetShell *t);

static void
eppm_set_label (GtkLabel *l, const char *v)
{
    gtk_label_set_label(l, v?v:_("Unknown"));
}

static void
eppm_switch_page_cb (GtkNotebook *notebook,
                     GtkNotebookPage *page,
                     guint page_num)
{
    last_selected_page = page_num;
}

static void
eppm_show_plugin (Manager *m, EPlugin *ep, GtkWidget *cfg_widget)
{
    if (ep) {
        char *string;

        string = g_strdup_printf ("<span size=\"x-large\">%s</span>", ep->name);
        gtk_label_set_markup (GTK_LABEL (m->items[LABEL_NAME]), string);
        gtk_label_set_markup (GTK_LABEL (m->config_plugin_label), string);
        g_free (string);

        if (ep->authors) {
            GSList *l = ep->authors;
            GString *out = g_string_new ("");

            for (; l; l = g_slist_next (l)) {
                EPluginAuthor *epa = l->data;

                if (l != ep->authors)
                    g_string_append (out, ",\n");
                if (epa->name)
                    g_string_append (out, epa->name);
                if (epa->email) {
                    g_string_append (out, " <");
                    g_string_append (out, epa->email);
                    g_string_append (out, ">");
                }
            }
            gtk_label_set_label (m->items[LABEL_AUTHOR], out->str);
            g_string_free (out, TRUE);
        } else {
            eppm_set_label (m->items[LABEL_AUTHOR], NULL);
        }

        eppm_set_label (m->items[LABEL_DESCRIPTION], ep->description);
    } else {
        int i;

        gtk_label_set_markup (GTK_LABEL (m->config_plugin_label), "");
        for (i = 0; i < LABEL_LAST; i++)
            gtk_label_set_label (m->items[i], "");
    }

    if (cfg_widget != NULL)
        gtk_notebook_append_page_menu (
            GTK_NOTEBOOK (notebook), configure_page,
            gtk_label_new (_("Configuration")), NULL);

    if (m->active_cfg_widget != cfg_widget) {
        if (m->active_cfg_widget)
            gtk_widget_hide (m->active_cfg_widget);

        if (cfg_widget)
            gtk_widget_show (cfg_widget);

        m->active_cfg_widget = cfg_widget;
    }
}

static void
eppm_selection_changed (GtkTreeSelection *selection, Manager *m)
{
    GtkTreeModel *model;
    GtkTreeIter iter;

    g_signal_handler_block (notebook, switch_page_handler_id);
    gtk_notebook_remove_page (GTK_NOTEBOOK (notebook), 1);
    g_signal_handler_unblock (notebook, switch_page_handler_id);

    if (gtk_tree_selection_get_selected (selection, &model, &iter)) {
        EPlugin *ep;
        GtkWidget *cfg_widget = NULL;

        gtk_tree_model_get (model, &iter, COL_PLUGIN_DATA, &ep, COL_PLUGIN_CFG_WIDGET, &cfg_widget, -1);
        eppm_show_plugin (m, ep, cfg_widget);

    } else {
        eppm_show_plugin (m, NULL, NULL);
    }

    g_signal_handler_block (notebook, switch_page_handler_id);
    gtk_notebook_set_current_page (
        GTK_NOTEBOOK (notebook), last_selected_page);
    g_signal_handler_unblock (notebook, switch_page_handler_id);
}

static void
eppm_enable_toggled (GtkCellRendererToggle *renderer, const char *path_string, Manager *m)
{
    GtkTreePath *path;
    GtkTreeIter iter;
    EPlugin *plugin;

    path = gtk_tree_path_new_from_string (path_string);

    if (gtk_tree_model_get_iter (m->model, &iter, path)) {
        gtk_tree_model_get (m->model, &iter, COL_PLUGIN_DATA, &plugin, -1);
        e_plugin_enable (plugin, !plugin->enabled);

        g_warning (plugin->name);

        gtk_list_store_set (GTK_LIST_STORE(m->model), &iter,
                    COL_PLUGIN_ENABLED, plugin->enabled,
                    -1);
    }

    gtk_tree_path_free (path);
}

static void
eppm_free (void *data)
{
    Manager *m = data;
    GSList *l;

    for (l = m->plugins; l; l = g_slist_next (l))
        g_object_unref (l->data);

    g_slist_free (m->plugins);
    g_object_unref (m->model);
    g_free (m);
}

static void
eppm_response (GtkDialog *w, int button, Manager *m)
{
    gtk_widget_destroy (GTK_WIDGET (w));
    dialog = NULL;
}

void
org_gnome_plugin_manager_manage (void *ep, ESMenuTargetShell *t)
{
    Manager *m;
    int i;
    GtkWidget *hbox, *w;
    GtkWidget *overview_page;
    GtkListStore *store;
    GtkTreeSelection *selection;
    GtkCellRenderer *renderer;
    GSList *l;
    char *string;
    GtkWidget *subvbox;

    if (dialog) {
        gtk_window_present (GTK_WINDOW (dialog));
        return;
    }

    m = g_malloc0 (sizeof (*m));

    /* Setup the ui */
    m->dialog = GTK_DIALOG (gtk_dialog_new_with_buttons (_("Plugin Manager"),
                                 GTK_WINDOW (gtk_widget_get_toplevel (t->target.widget)),
                                 GTK_DIALOG_DESTROY_WITH_PARENT,
                                 GTK_STOCK_CLOSE, GTK_RESPONSE_CLOSE,
                                 NULL));

    gtk_window_set_default_size (GTK_WINDOW (m->dialog), 640, 400);
    g_object_set (G_OBJECT (m->dialog), "has_separator", FALSE, NULL);

    hbox = gtk_hbox_new (FALSE, 0);
    gtk_container_set_border_width (GTK_CONTAINER (hbox), 12);
    gtk_box_pack_start (GTK_BOX (m->dialog->vbox), hbox, TRUE, TRUE, 0);

    string = g_strdup_printf ("<i>%s</i>", _("Note: Some changes will not take effect until restart"));

    w = g_object_new (gtk_label_get_type (),
              "label", string,
              "wrap", FALSE,
              "use_markup", TRUE,
              NULL);
    gtk_widget_show (w);
    g_free (string);

    gtk_box_pack_start (GTK_BOX (m->dialog->vbox), w, FALSE, TRUE, 6);

    notebook = gtk_notebook_new ();
    gtk_notebook_set_show_tabs (GTK_NOTEBOOK (notebook), TRUE);
    gtk_notebook_set_show_border (GTK_NOTEBOOK (notebook), FALSE);
    gtk_notebook_set_scrollable (GTK_NOTEBOOK (notebook), TRUE);

    switch_page_handler_id = g_signal_connect (
        notebook, "switch-page",
        G_CALLBACK (eppm_switch_page_cb), NULL);

    overview_page = gtk_vbox_new (FALSE, 0);
    configure_page = gtk_vbox_new (FALSE, 0);
    g_object_ref_sink (configure_page);
    gtk_container_set_border_width (GTK_CONTAINER (overview_page), 10);
    gtk_container_set_border_width (GTK_CONTAINER (configure_page), 10);
    gtk_notebook_append_page_menu (GTK_NOTEBOOK (notebook), overview_page, gtk_label_new (_("Overview")), NULL);

    gtk_widget_show (notebook);
    gtk_widget_show (overview_page);
    gtk_widget_show (configure_page);

    /* name of plugin on "Configuration" tab */
    m->config_plugin_label = g_object_new (
        gtk_label_get_type (),
        "wrap", TRUE,
        "selectable", FALSE,
        "xalign", 0.0,
        "yalign", 0.0, NULL);
    gtk_widget_show (m->config_plugin_label);
    gtk_box_pack_start (GTK_BOX (configure_page), m->config_plugin_label, FALSE, FALSE, 6);

    store = gtk_list_store_new (4, G_TYPE_BOOLEAN, G_TYPE_STRING, G_TYPE_POINTER, G_TYPE_POINTER);

    /* fill store */
    m->plugins = e_plugin_list_plugins ();

    for (l = m->plugins; l; l = g_slist_next (l)) {
        EPlugin *ep = l->data;
        GtkTreeIter iter;
        GtkWidget *cfg_widget;

        if (!g_getenv ("EVO_SHOW_ALL_PLUGINS")) { 
            /* hide ourselves always */
            if (ep->flags & E_PLUGIN_FLAGS_SYSTEM_PLUGIN)
                continue;

        } else {
            /* Never ever show plugin-manager. User may disable it */
            if (!strcmp (ep->id, "org.gnome.evolution.plugin.manager"))
                continue;
        }

        cfg_widget = e_plugin_get_configure_widget (ep);
        if (cfg_widget) {
            gtk_widget_hide (cfg_widget);
            gtk_box_pack_start (GTK_BOX (configure_page), cfg_widget, TRUE, TRUE, 6);
        }

        gtk_list_store_append (store, &iter);
        gtk_list_store_set (store, &iter,
                    COL_PLUGIN_ENABLED, ep->enabled,
                    COL_PLUGIN_NAME, ep->name ? ep->name : ep->id,
                    COL_PLUGIN_DATA, ep,
                    COL_PLUGIN_CFG_WIDGET, cfg_widget,
                    -1);
                    
    }

    /* setup the treeview */
    m->treeview = GTK_TREE_VIEW (gtk_tree_view_new ());
    gtk_tree_view_set_reorderable (m->treeview, FALSE);
    gtk_tree_view_set_model (m->treeview, GTK_TREE_MODEL (store));
    gtk_tree_view_set_search_column (m->treeview, COL_PLUGIN_NAME);
    gtk_tree_view_set_headers_visible (m->treeview, TRUE);

    m->model = GTK_TREE_MODEL (store);

    renderer = gtk_cell_renderer_toggle_new ();
    gtk_tree_view_insert_column_with_attributes (m->treeview,
                             COL_PLUGIN_ENABLED, _("Enabled"),
                             renderer, "active", COL_PLUGIN_ENABLED,
                             NULL);
    g_signal_connect (renderer, "toggled", G_CALLBACK (eppm_enable_toggled), m);

    renderer = gtk_cell_renderer_text_new ();
    gtk_tree_view_insert_column_with_attributes (m->treeview,
                             COL_PLUGIN_NAME, _("Plugin"),
                             renderer, "text", COL_PLUGIN_NAME,
                             NULL);

    /* set sort column */
    gtk_tree_sortable_set_sort_column_id (GTK_TREE_SORTABLE (m->model), COL_PLUGIN_NAME, GTK_SORT_ASCENDING);

    w = gtk_scrolled_window_new (NULL, NULL);
    gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (w), GTK_POLICY_NEVER, GTK_POLICY_ALWAYS);
    gtk_scrolled_window_set_shadow_type (GTK_SCROLLED_WINDOW (w), GTK_SHADOW_IN);
    gtk_container_add (GTK_CONTAINER (w), GTK_WIDGET (m->treeview));

    gtk_box_pack_start (GTK_BOX (hbox), GTK_WIDGET (w), FALSE, TRUE, 6);

    /* Show all widgets in hbox before we pack there notebook, because not all widgets in notebook
       are going to be visible at one moment. */
    gtk_widget_show_all (hbox);

    gtk_box_pack_start (GTK_BOX (hbox), notebook, TRUE, TRUE, 6);

    /* this is plugin's name label */
    subvbox = gtk_vbox_new (FALSE, 6);
    m->items[0] = g_object_new (gtk_label_get_type (),
                    "wrap", TRUE,
                    "selectable", FALSE,
                    "xalign", 0.0,
                    "yalign", 0.0, NULL);
    gtk_box_pack_start (GTK_BOX (subvbox), GTK_WIDGET (m->items[0]), TRUE, TRUE, 0);
    gtk_box_pack_start (GTK_BOX (overview_page), subvbox, FALSE, TRUE, 6);

    /* this is every other data */
    for (i = 1; i < LABEL_LAST; i++) {
        char *markup;

        subvbox = gtk_vbox_new (FALSE, 6);

        markup = g_strdup_printf ("<span weight=\"bold\">%s:</span>", _(label_info[i].label));
        m->labels[i] = g_object_new (gtk_label_get_type (),
                         "label", markup,
                         "use_markup", TRUE,
                         "xalign", 0.0,
                         "yalign", 0.0, NULL);
        gtk_box_pack_start (GTK_BOX (subvbox), GTK_WIDGET (m->labels[i]), FALSE, TRUE, 0);
        g_free (markup);

        m->items[i] = g_object_new (gtk_label_get_type (),
                        "wrap", TRUE,
                        "selectable", TRUE,
                        "can-focus", FALSE,
                        "xalign", 0.0,
                        "yalign", 0.0, NULL);
        gtk_box_pack_start (GTK_BOX (subvbox), GTK_WIDGET (m->items[i]), TRUE, TRUE, 0);

        gtk_box_pack_start (GTK_BOX (overview_page), subvbox, FALSE, TRUE, 6);
    }

    gtk_widget_show_all (overview_page);

    selection = gtk_tree_view_get_selection (m->treeview);
    gtk_tree_selection_set_mode (selection, GTK_SELECTION_SINGLE);
    g_signal_connect (selection, "changed", G_CALLBACK (eppm_selection_changed), m);

    atk_object_set_name (gtk_widget_get_accessible (GTK_WIDGET (m->treeview)), _("Plugin"));

    g_object_set_data_full (G_OBJECT (m->dialog), "plugin-manager", m, eppm_free);
    g_signal_connect (m->dialog, "response", G_CALLBACK (eppm_response), m);

    dialog = m->dialog;

    gtk_widget_show (GTK_WIDGET (m->dialog));
}

int e_plugin_lib_enable (EPluginLib *ep, int enable);

int
e_plugin_lib_enable (EPluginLib *ep, int enable)
{
    if (enable) {
    } else {
        /* This plugin can't be disabled ... */
        return -1;
    }

    return 0;
}