/* this file is part of evince, a gnome document viewer
 *
 *  Copyright (C) 2009 litl, LLC
 *
 * Evince 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.
 *
 * Evince 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.
 */

#include "evince-view.h"
#include "plugin.h"
#include "scriptable.h"

Plugin::Plugin (NPP instance)
{
    mInstance = instance;
    mWindow = 0;
    mScriptableObject = NULL;

    mScrolledWindow = gtk_scrolled_window_new (NULL, NULL);

    mView = ev_view_new ();
    g_signal_connect (G_OBJECT (mView),
                      "notify::sizing-mode",
                      G_CALLBACK (Plugin::SizingModeCallback),
                      reinterpret_cast<void*>(this));

    /* FIXME should be set automatically in EvView. It seem to be currently
       used only to calculate the minimum and maximux allowed zoom level. */
    ev_view_set_screen_dpi (EV_VIEW(mView), 96);

    gtk_container_add (GTK_CONTAINER(mScrolledWindow), mView);
    gtk_widget_show (mView);

    UpdateSizingMode ();
}

Plugin::~Plugin ()
{
}

void
Plugin::ZoomIn ()
{
    ev_view_set_sizing_mode (EV_VIEW (mView), EV_SIZING_FREE);
    ev_view_zoom_in (EV_VIEW (mView));
}

void
Plugin::ZoomOut ()
{
    ev_view_set_sizing_mode (EV_VIEW (mView), EV_SIZING_FREE);
    ev_view_zoom_out (EV_VIEW (mView));
}

void
Plugin::FindNext (const char *text)
{
}

void
Plugin::FindPrevious (const char *text)
{
}

void
Plugin::SetWindow (GdkNativeWindow window)
{
    if (mWindow != 0) {
        return;
    }

    mWindow = window;

    GtkWidget *plug = gtk_plug_new (window);
    gtk_container_add (GTK_CONTAINER (plug), mScrolledWindow);
    gtk_widget_show (mScrolledWindow);

    gtk_widget_show (plug);
}

void
Plugin::Load (const char *fname)
{
    GError *error = NULL;

    GFile *file = g_file_new_for_path (fname);
    char *uri = g_file_get_uri (file);
    g_object_unref (file);

    /* FIXME display loading error in the UI */

    EvDocument *document = ev_document_factory_get_document (uri, &error);
    if (error) {
        g_warning ("Cannot create document for %s", uri);
        g_error_free (error);
        return;
    }

    ev_view_set_document (EV_VIEW (mView), document);

    ev_document_load (document, uri, &error);
    if (error) {
        g_warning ("Cannot load %s", uri);
        g_error_free (error);
        return;
    }

    g_free (uri);
}

NPObject * 
Plugin::GetScriptableNPObject () 
{
    if (!mScriptableObject) {
        mScriptableObject = NPN_CreateObject (
                    mInstance, GET_NPOBJECT_CLASS (ScriptablePluginObject));
    }

    if (mScriptableObject) {
        NPN_RetainObject (mScriptableObject);
    }

    return mScriptableObject;
}

void
Plugin::UpdateSizingMode ()
{
    EvSizingMode sizingMode;

    g_signal_handlers_disconnect_by_func (
        mView, (gpointer)ev_view_update_view_size, mScrolledWindow);

    g_object_get (G_OBJECT (mView),
                  "sizing-mode", &sizingMode,
                  NULL);

    if (sizingMode != EV_SIZING_FREE)
        ev_view_update_view_size (EV_VIEW (mView),
                                  GTK_SCROLLED_WINDOW (mScrolledWindow));

    switch (sizingMode) {
        case EV_SIZING_BEST_FIT:
        case EV_SIZING_FIT_WIDTH:
            g_object_set (G_OBJECT (mScrolledWindow),
                            "hscrollbar-policy", GTK_POLICY_NEVER,
                            "vscrollbar-policy", GTK_POLICY_ALWAYS,
                            NULL);
            g_signal_connect (mView, "zoom_invalid",
                                G_CALLBACK (ev_view_update_view_size),
                                mScrolledWindow);
            break;

        case EV_SIZING_FREE:
            g_object_set (G_OBJECT (mScrolledWindow),
                            "hscrollbar-policy", GTK_POLICY_AUTOMATIC,
                            "vscrollbar-policy", GTK_POLICY_AUTOMATIC,
                            NULL);
            break;
    }
}

void
Plugin::SizingModeCallback (EvView *view, GParamSpec *pspec, gpointer data)
{
    Plugin *plugin = reinterpret_cast<Plugin*> (data);
    plugin->UpdateSizingMode ();
}