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/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* importer.c
 *
 * Copyright (C) 2000  Ximian, Inc.
 *
 * 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 Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * Author: Iain Holmes  <iain@ximian.com>
 */

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

#include <glib.h>
#include <libgnome/gnome-defs.h>
#include <libgnome/gnome-i18n.h>
#include <libgnomeui/gnome-druid.h>
#include <libgnomeui/gnome-druid-page-finish.h>
#include <libgnomeui/gnome-druid-page-standard.h>
#include <libgnomeui/gnome-druid-page-start.h>
#include <libgnomeui/gnome-file-entry.h>
#include <libgnomeui/gnome-stock.h>
#include <libgnomeui/gnome-dialog.h>

#include <liboaf/liboaf.h>

#include "e-shell.h"
#include "e-shell-view.h"
#include "e-shell-folder-selection-dialog.h"

#include "importer/evolution-importer-client.h"

#include <glade/glade.h>
#include <gtkhtml/gtkhtml.h>
#include <gal/widgets/e-gui-utils.h>
#include <e-util/e-html-utils.h>
#include <gal/widgets/e-gui-utils.h>
#include <gal/widgets/e-unicode.h>

#include "e-shell-importer.h"
#include "importer/GNOME_Evolution_Importer.h"

typedef struct _ImportDialogFilePage {
    GtkWidget *vbox;
    GtkWidget *filename;
    GtkWidget *filetype;
    GtkWidget *menu;

    gboolean need_filename;
} ImportDialogFilePage;

typedef struct _ImportData {
    EShell *shell;
    EShellView *view;
    
    GladeXML *wizard;
    GtkWidget *dialog;
    GtkWidget *druid;
    ImportDialogFilePage *filepage;
    GtkWidget *filedialog;
    GtkWidget *vbox;

    char *choosen_iid;
} ImportData;

/*
  #define IMPORTER_DEBUG
*/
#ifdef IMPORTER_DEBUG
#define IN g_print ("=====> %s (%d)\n", __FUNCTION__, __LINE__)
#define OUT g_print ("<==== %s (%d)\n", __FUNCTION__, __LINE__)
#else
#define IN
#define OUT
#endif

/* Some HTML helper functions copied from mail/mail-config-druid.c */
static struct {
    char *name;
    char *text;
} info[] = {
    { "file_html",
      N_("Choose the file that you want to import into Evolution, "
         "and select what type of file it is from the list.\n\n"
         "You can select \"Automatic\" if you do not know, and "
         "Evolution will attempt to work it out.")
    }
};
static int num_info = (sizeof (info) / sizeof (info[0]));

static void
html_size_req (GtkWidget *widget,
           GtkRequisition *requisition)
{
    requisition->height = GTK_LAYOUT (widget)->height;
}

static GtkWidget *
create_html (const char *name)
{
    GtkWidget *scrolled, *html;
    GtkHTMLStream *stream;
    GtkStyle *style;
    char *utf8;
    int i;

    html = gtk_html_new ();
    GTK_LAYOUT (html)->height = 0;
    gtk_signal_connect (GTK_OBJECT (html), "size_request",
                GTK_SIGNAL_FUNC (html_size_req), NULL);
    gtk_html_set_editable (GTK_HTML (html), FALSE);
    style = gtk_rc_get_style (html);
    if (!style)
        style = gtk_widget_get_style (html);
    if (style) {
        gtk_html_set_default_background_color (GTK_HTML (html),
                               &style->bg[0]);
    }
    gtk_widget_show (html);

    scrolled = gtk_scrolled_window_new (NULL, NULL);
    gtk_widget_show (scrolled);
    gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scrolled),
                    GTK_POLICY_NEVER, GTK_POLICY_NEVER);
    gtk_container_add (GTK_CONTAINER (scrolled), html);

    for (i = 0; i < num_info; i++) {
        if (!strcmp (name, info[i].name))
            break;
    }
    g_return_val_if_fail (i != num_info, scrolled);

    stream = gtk_html_begin_content (GTK_HTML (html),
                     "text/html; charset=utf-8");
    gtk_html_write (GTK_HTML (html), stream, "<html><p>", 9);
    utf8 = e_utf8_from_locale_string (_(info[i].text));
    gtk_html_write (GTK_HTML (html), stream, utf8, strlen (utf8));
    g_free (utf8);
    gtk_html_write (GTK_HTML (html), stream, "</p></html>", 11);
    gtk_html_end (GTK_HTML (html), stream, GTK_HTML_STREAM_OK);

    return scrolled;
}

/* Importing functions */

/* Data to be passed around */
typedef struct _ImporterComponentData {
    EvolutionImporterClient *client;
    EvolutionImporterListener *listener;
    char *filename;

    GnomeDialog *dialog;
    GtkWidget *contents;

    int item;

    gboolean stop;
    gboolean destroyed;
} ImporterComponentData;

static gboolean importer_timeout_fn (gpointer data);
static void
import_cb (EvolutionImporterListener *listener,
       EvolutionImporterResult result,
       gboolean more_items,
       void *data)
{
    ImporterComponentData *icd = (ImporterComponentData *) data;
    char *label;

    IN;
    if (icd->stop != TRUE) {
        if (result == EVOLUTION_IMPORTER_NOT_READY) {
            /* Importer isn't ready yet. 
               Wait 5 seconds and try again. */
            
            label = g_strdup_printf (_("Importing %s\nImporter not ready."
                           "\nWaiting 5 seconds to retry."),
                         icd->filename);
            gtk_label_set_text (GTK_LABEL (icd->contents), label);
            g_free (label);
            while (gtk_events_pending ())
                gtk_main_iteration ();
            
            gtk_timeout_add (5000, importer_timeout_fn, data);
            OUT;
            return;
        }
        
        if (result == EVOLUTION_IMPORTER_BUSY) {
            gtk_timeout_add (5000, importer_timeout_fn, data);
            OUT;
            return;
        }

        if (more_items) {
            label = g_strdup_printf (_("Importing %s\nImporting item %d."),
                         icd->filename, ++(icd->item));
            gtk_label_set_text (GTK_LABEL (icd->contents), label);
            g_free (label);
            while (gtk_events_pending ())
                gtk_main_iteration ();
            
            g_idle_add_full (G_PRIORITY_LOW, importer_timeout_fn, 
                     data, NULL);
            OUT;
            return;
        }
    }
    
    g_free (icd->filename);
    if (!icd->destroyed)
        gtk_object_destroy (GTK_OBJECT (icd->dialog));
    bonobo_object_unref (BONOBO_OBJECT (icd->listener));
    gtk_object_unref (GTK_OBJECT (icd->client));
    g_free (icd);

    OUT;
}

static gboolean
importer_timeout_fn (gpointer data)
{
    ImporterComponentData *icd = (ImporterComponentData *) data;
    char *label;

    IN;
    label = g_strdup_printf (_("Importing %s\nImporting item %d."),
                 icd->filename, icd->item);
    gtk_label_set_text (GTK_LABEL (icd->contents), label);
    g_free (label);
    while (gtk_events_pending ())
        gtk_main_iteration ();
    
    evolution_importer_client_process_item (icd->client, icd->listener);
    OUT;
    return FALSE;
}

static void
dialog_clicked_cb (GnomeDialog *dialog,
           int button_number,
           ImporterComponentData *icd)
{
    if (button_number != 0)
        return; /* Interesting... */

    icd->stop = TRUE;
}

static void
dialog_destroy_cb (GtkObject *object,
           ImporterComponentData *icd)
{
    icd->stop = TRUE;
    icd->destroyed = TRUE;
}

static char *
get_iid_for_filetype (const char *filename)
{
    OAF_ServerInfoList *info_list;
    CORBA_Environment ev;
    GList *can_handle = NULL, *l;
    char *ret_iid;
    int i, len = 0;

    CORBA_exception_init (&ev);
    info_list = oaf_query ("repo_ids.has ('IDL:GNOME/Evolution/Importer:1.0')", NULL, &ev);

    for (i = 0; i < info_list->_length; i++) {
        CORBA_Environment ev2;
        CORBA_Object importer;
        const OAF_ServerInfo *info;

        info = info_list->_buffer + i;

        CORBA_exception_init (&ev2);
        importer = oaf_activate_from_id ((char *) info->iid, 0, NULL, &ev2);
        if (ev2._major != CORBA_NO_EXCEPTION) {
            g_warning ("Error activating %s", info->iid);
            CORBA_exception_free (&ev2);
            continue;
        }

        if (GNOME_Evolution_Importer_supportFormat (importer,
                                filename, &ev2)) {
            can_handle = g_list_prepend (can_handle, 
                             g_strdup (info->iid));
            len++;
        }

        bonobo_object_release_unref (importer, &ev2);
        CORBA_exception_free (&ev2);
    }

    if (len == 1) {
        ret_iid = can_handle->data;
        g_list_free (can_handle);
        return ret_iid;
    } else if (len > 1) {
        /* FIXME: Some way to choose between multiple iids */
        /* FIXME: Free stuff */
        g_warning ("Multiple iids can support %s", filename);
        ret_iid = g_strdup (can_handle->data);
        
        for (l = can_handle; l; l = l->next)
            g_free (l->data);
        g_list_free (can_handle);
        return ret_iid;
    } else {
        return NULL;
    }
}
            
static void
start_import (const char *folderpath,
          const char *filename,
          const char *iid)
{
    ImporterComponentData *icd;
    char *label;
    char *real_iid;
    
    if (iid == NULL || strcmp (iid, "Automatic") == 0) {
        /* Work out the component to use */
        real_iid = get_iid_for_filetype (filename);
    } else {
        real_iid = g_strdup (iid);
    }

    if (real_iid == NULL) {
        char *message;

        message = g_strdup_printf (_("There is no importer that is able to handle\n%s"), filename);
        e_notice (NULL, GNOME_MESSAGE_BOX_ERROR, message);
        g_free (message);

        return;
    }

    g_print ("Importing with: %s\n", real_iid);

    icd = g_new (ImporterComponentData, 1);
    icd->stop = FALSE;
    icd->destroyed = FALSE;
    icd->dialog = GNOME_DIALOG (gnome_dialog_new (_("Importing"),
                              GNOME_STOCK_BUTTON_CANCEL,
                              NULL));
    gtk_signal_connect (GTK_OBJECT (icd->dialog), "clicked",
                GTK_SIGNAL_FUNC (dialog_clicked_cb), icd);
    gtk_signal_connect (GTK_OBJECT (icd->dialog), "destroy",
                GTK_SIGNAL_FUNC (dialog_destroy_cb), icd);
    
    label = g_strdup_printf (_("Importing %s.\nStarting %s"),
                 filename, real_iid);
    icd->contents = gtk_label_new (label);
    g_free (label);
    
    gtk_box_pack_start (GTK_BOX (icd->dialog->vbox), icd->contents,
                TRUE, TRUE, 0);
    gtk_widget_show_all (GTK_WIDGET (icd->dialog));
    while (gtk_events_pending ())
        gtk_main_iteration ();
    
    icd->client = evolution_importer_client_new_from_id (real_iid);
    if (icd->client == NULL) {
        label = g_strdup_printf (_("Error starting %s"), real_iid);
        g_free (real_iid);
        gtk_label_set_text (GTK_LABEL (icd->contents), label);
        g_free (label);
        while (gtk_events_pending ())
            gtk_main_iteration ();

        gtk_object_unref (GTK_OBJECT (icd->dialog));
        g_free (icd);
        return;
    }
    g_free (real_iid);

    /* NULL for folderpath means use Inbox */
    if (*folderpath == '/') {
        folderpath = strchr (folderpath + 1, '/');
    }

    if (evolution_importer_client_load_file (icd->client, filename, folderpath) == FALSE) {
        label = g_strdup_printf (_("Error loading %s"), filename);
        gtk_label_set_text (GTK_LABEL (icd->contents), label);
        g_free (label);
        while (gtk_events_pending ())
            gtk_main_iteration ();
        
        gtk_object_unref (GTK_OBJECT (icd->client));
        gtk_object_unref (GTK_OBJECT (icd->dialog));
        g_free (icd);
        return;
    }

    icd->filename = g_strdup (filename);
    icd->item = 1;
    
    label = g_strdup_printf (_("Importing %s\nImporting item 1."),
                 filename);
    gtk_label_set_text (GTK_LABEL (icd->contents), label);
    g_free (label);
    while (gtk_events_pending ())
        gtk_main_iteration ();

    icd->listener = evolution_importer_listener_new (import_cb, icd);
    evolution_importer_client_process_item (icd->client, icd->listener);
}

static void
filename_changed (GtkEntry *entry,
          ImportData *data)
{
    ImportDialogFilePage *page;
    char *filename;

    page = data->filepage;

    filename = gtk_entry_get_text (entry);
    if (filename != NULL && *filename != '\0')
        page->need_filename = FALSE;
    else
        page->need_filename = TRUE;

    gnome_druid_set_buttons_sensitive (GNOME_DRUID (data->druid), 
                       TRUE, !page->need_filename, TRUE);
}

static const char *
get_name_from_component_info (const OAF_ServerInfo *info)
{
    OAF_Property *property;
    const char *name;

    property = oaf_server_info_prop_find ((OAF_ServerInfo *) info,
                          "evolution:menu-name");
    if (property == NULL || property->v._d != OAF_P_STRING)
        return NULL;

    name = property->v._u.value_string;

    return name;
}

static void
item_selected (GtkWidget *item,
           ImportData *data)
{
    char *iid;

    g_free (data->choosen_iid);
    iid = gtk_object_get_data (GTK_OBJECT (item), "oafiid");
    g_print ("iid: %s\n", iid);
    if (iid == NULL)
        data->choosen_iid = g_strdup ("Automatic");
    else
        data->choosen_iid = g_strdup (iid);
}

static GtkWidget *
create_plugin_menu (ImportData *data)
{
    OAF_ServerInfoList *info_list;
    CORBA_Environment ev;
    int i;
    GtkWidget *menu;
    GtkWidget *item;

    menu = gtk_menu_new ();
    item = gtk_menu_item_new_with_label (_("Automatic"));
    gtk_object_set_data_full (GTK_OBJECT (item), "oafiid",
                  g_strdup ("Automatic"), g_free);
    gtk_menu_append (GTK_MENU (menu), item);

    CORBA_exception_init (&ev);
    info_list = oaf_query ("repo_ids.has ('IDL:GNOME/Evolution/Importer:1.0')", NULL, &ev);
    for (i = 0; i < info_list->_length; i++) {
        const OAF_ServerInfo *info;
        char *name = NULL;

        info = info_list->_buffer + i;

        name = g_strdup (get_name_from_component_info (info));
        if (name == NULL) {
            name = g_strdup (info->iid);
        }

        item = gtk_menu_item_new_with_label (name);
        g_free (name);

        gtk_signal_connect (GTK_OBJECT (item), "activate",
                    GTK_SIGNAL_FUNC (item_selected), data);

        gtk_object_set_data_full (GTK_OBJECT (item), "oafiid",
                      g_strdup (info->iid), g_free);
        gtk_menu_append (GTK_MENU (menu), item);
    }

    return menu;
}

static ImportDialogFilePage *
importer_file_page_new (ImportData *data)
{
    ImportDialogFilePage *page;
    GtkWidget *table, *label;
    int row = 0;

    page = g_new0 (ImportDialogFilePage, 1);

    page->vbox = gtk_vbox_new (FALSE, 5);
    page->need_filename = TRUE;

    table = gtk_table_new (2, 2, FALSE);
    gtk_table_set_row_spacings (GTK_TABLE (table), 2);
    gtk_table_set_col_spacings (GTK_TABLE (table), 10);
    gtk_container_set_border_width (GTK_CONTAINER (table), 8);
    gtk_box_pack_start (GTK_BOX (page->vbox), table, TRUE, TRUE, 0);

    label = gtk_label_new (_("Filename:"));
    gtk_table_attach (GTK_TABLE (table), label, 0, 1, row, row + 1, 
              GTK_FILL, 0, 0, 0);
    gtk_misc_set_alignment (GTK_MISC (label), 1, 0.5);

    page->filename = gnome_file_entry_new (NULL, _("Select a file"));
    gtk_signal_connect (GTK_OBJECT (gnome_file_entry_gtk_entry (GNOME_FILE_ENTRY (page->filename))),
                "changed", GTK_SIGNAL_FUNC (filename_changed),
                data);

    gtk_table_attach (GTK_TABLE (table), page->filename, 1, 2, 
              row, row + 1, GTK_EXPAND | GTK_FILL, 0, 0, 0);

    row++;

    label = gtk_label_new (_("File type:"));
    gtk_table_attach (GTK_TABLE (table), label, 0, 1, row, row + 1,
              GTK_FILL, 0, 0, 0);
    gtk_misc_set_alignment (GTK_MISC (label), 1, 0.5);

    page->filetype = gtk_option_menu_new ();
    page->menu = create_plugin_menu (data);
    gtk_option_menu_set_menu (GTK_OPTION_MENU (page->filetype), page->menu);

    gtk_table_attach (GTK_TABLE (table), page->filetype, 1, 2, 
              row, row + 1, GTK_EXPAND | GTK_FILL, 0, 0, 0);
    gtk_widget_show_all (table);

    return page;
}

static void
import_druid_cancel (GnomeDruid *druid,
             ImportData *data)
{
    gtk_widget_destroy (GTK_WIDGET (data->dialog));
}

static void
import_druid_destroy (GtkObject *object,
              ImportData *data)
{
    gtk_object_unref (GTK_OBJECT (data->wizard));
    g_free (data->choosen_iid);
    g_free (data);
}

static void
folder_selected (EShellFolderSelectionDialog *dialog,
         const char *path,
         ImportData *data)
{
    char *filename, *iid;

    iid = g_strdup (data->choosen_iid);
    filename = g_strdup (gtk_entry_get_text (GTK_ENTRY (gnome_file_entry_gtk_entry (GNOME_FILE_ENTRY (data->filepage->filename)))));

    gtk_widget_destroy (data->dialog);
    start_import (path, filename, iid);

    g_free (iid);
    g_free (filename);
}

static void
folder_cancelled (EShellFolderSelectionDialog *dialog,
          ImportData *data)
{
    gtk_widget_destroy (data->dialog);
}

static void
import_druid_finish (GnomeDruidPage *page,
             GnomeDruid *druid,
             ImportData *data)
{
    GtkWidget *folder;
    char *filename;
    char *iid;

    filename = g_strdup (gtk_entry_get_text (GTK_ENTRY (gnome_file_entry_gtk_entry (GNOME_FILE_ENTRY (data->filepage->filename)))));
    iid = g_strdup (data->choosen_iid);

    folder = e_shell_folder_selection_dialog_new (data->shell, 
                              _("Select folder"),
                              _("Select a destination folder for importing this data"),
                              e_shell_view_get_current_uri (data->view),
                              NULL);

    gtk_signal_connect (GTK_OBJECT (folder), "folder_selected",
                GTK_SIGNAL_FUNC (folder_selected), data);
    gtk_signal_connect (GTK_OBJECT (folder), "cancelled",
                GTK_SIGNAL_FUNC (folder_cancelled), data);

    gtk_widget_hide (data->dialog);
    gtk_widget_show (folder);
#if 0
    gnome_dialog_close_hides (GNOME_DIALOG (folder), TRUE);
    switch (gnome_dialog_run (GNOME_DIALOG (folder))) {
    case 0:
    case 2:
        foldername = e_shell_folder_selection_dialog_get_selected_path (E_SHELL_FOLDER_SELECTION_DIALOG (folder));
        g_print ("Folder name: %s", foldername);
        start_import (foldername, filename, iid);
        /* Fall through */

    default:
        gtk_widget_destroy (folder);
        break;
    }

    g_free (filename);
    g_free (iid);
#endif
}

static gboolean
prepare_file_page (GnomeDruidPage *page,
           GnomeDruid *druid,
           ImportData *data)
{
    gnome_druid_set_buttons_sensitive (druid, TRUE, 
                       !data->filepage->need_filename, 
                       TRUE);
    return FALSE;
}

/* Hack to change the Finish button */
static void
druid_finish_button_change (GnomeDruid *druid)
{
    GtkWidget *button = druid->finish;
    GtkWidget *hbox = GTK_BIN (button)->child, *hbox2;
    GtkBoxChild *child;
    GtkWidget *label;

    /* Get the second item from the children list */
    hbox2 = ((GtkBoxChild *)GTK_BOX (hbox)->children->data)->widget;

    g_return_if_fail (GTK_IS_BOX (hbox2));
    child = (GtkBoxChild *)g_list_nth_data (GTK_BOX (hbox2)->children, 0);
    label = child->widget;

    /* Safety check :) */
    g_return_if_fail (GTK_IS_LABEL (label));

    gtk_label_set_text (GTK_LABEL (label), _("Import"));
}

void
show_import_wizard (BonoboUIComponent *component,
            gpointer           user_data,
            const char        *cname)
{
    ImportData *data = g_new0 (ImportData, 1);
    GnomeDruidPageStart *start;
    GnomeDruidPageFinish *finish;
    GtkWidget *html;

    data->view = E_SHELL_VIEW (user_data);
    data->shell = e_shell_view_get_shell (data->view);

    data->wizard = glade_xml_new (EVOLUTION_GLADEDIR "/import.glade", NULL);
    data->dialog = glade_xml_get_widget (data->wizard, "importwizard");
    gtk_window_set_wmclass (GTK_WINDOW (data->dialog), "importdruid",
                "Evolution:shell");

    data->druid = glade_xml_get_widget (data->wizard, "druid1");
    gtk_signal_connect (GTK_OBJECT (data->druid), "cancel",
                GTK_SIGNAL_FUNC (import_druid_cancel), data);

    druid_finish_button_change (GNOME_DRUID (data->druid));
    start = GNOME_DRUID_PAGE_START (glade_xml_get_widget (data->wizard, "page1"));
    data->filedialog = glade_xml_get_widget (data->wizard, "page2");
    gtk_signal_connect (GTK_OBJECT (data->filedialog), "prepare",
                GTK_SIGNAL_FUNC (prepare_file_page), data);

    finish = GNOME_DRUID_PAGE_FINISH (glade_xml_get_widget (data->wizard, "page3"));

    data->filepage = importer_file_page_new (data);
    data->vbox = data->filepage->vbox;

    html = create_html ("file_html");
    gtk_box_pack_start (GTK_BOX (data->vbox), html, FALSE, TRUE, 0);
    gtk_box_reorder_child (GTK_BOX (data->vbox), html, 0);

    gtk_box_pack_start (GTK_BOX (GNOME_DRUID_PAGE_STANDARD (data->filedialog)->vbox), data->vbox, TRUE, TRUE, 0);

    /* Finish page */
    gtk_signal_connect (GTK_OBJECT (finish), "finish",
                GTK_SIGNAL_FUNC (import_druid_finish), data);
    gtk_signal_connect (GTK_OBJECT (data->dialog), "destroy",
                GTK_SIGNAL_FUNC (import_druid_destroy), data);

    gtk_widget_show_all (data->dialog);
}