/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8; c-indent-level: 8 -*- */
/* this file is part of evince, a gnome document viewer
 *
 *  Copyright (C) 2007 Johannes Buchner
 *
 *  Author:
 *    Johannes Buchner <buchner.johannes@gmx.at>
 *    Lukas Bezdicka <255993@mail.muni.cz>
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */

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

#include <glib/gi18n.h>
#include <gtk/gtk.h>

#include "ev-dualscreen.h"
#include "ev-window.h"
#include "ev-view.h"
#include "ev-view-presentation.h"
#include "ev-utils.h"
#include "ev-sidebar.h"
#include "ev-sidebar-thumbnails.h"

struct _EvDSCWindowPrivate {
	GtkWidget       *main_box;
	GtkWidget       *menubar;
	GtkWidget       *sidebar;
	GtkWidget       *notesview;
	EvDocumentModel *model;
	EvDocumentModel *notes_model;
	EvDocument      *presentation_document;
	EvDocument      *notes_document;

	GtkWidget       *presentation_window;
	GtkWidget       *overview_scrolled_window;
	GtkWidget       *notesview_scrolled_window;

	EvViewPresentation *presentation_view;
	gint		moveback_monitor;
};

#define EV_DSCWINDOW_GET_PRIVATE(object) \
	(G_TYPE_INSTANCE_GET_PRIVATE ((object), EV_TYPE_DSCWINDOW, EvDSCWindowPrivate))
#define PAGE_CACHE_SIZE 52428800 /* 50MB */

G_DEFINE_TYPE (EvDSCWindow, ev_dscwindow, GTK_TYPE_WINDOW)

static gboolean
ev_dscwindow_switch_monitors (GtkWidget *widget, EvDSCWindow *ev_dscwindow)
{
	if (!EV_IS_DSCWINDOW (ev_dscwindow))
		return FALSE;

	gint num_monitors = get_num_monitors (GTK_WINDOW (ev_dscwindow));

	if (num_monitors == 2) {
		GtkWindow *presentation_window = GTK_WINDOW (ev_dscwindow->priv->presentation_window);
		GdkScreen *screen = gtk_window_get_screen (presentation_window);

		gint monitor_1 = gdk_screen_get_monitor_at_window (screen,
			gtk_widget_get_window (GTK_WIDGET (presentation_window)));

		gint monitor_2 = (monitor_1 + 1) % 2;

		GdkRectangle coords;
		gdk_screen_get_monitor_geometry (screen, monitor_2, &coords);
		gtk_window_move (presentation_window, coords.x, coords.y);
		ev_dscwindow->priv->moveback_monitor = monitor_1;

		gdk_screen_get_monitor_geometry (screen, monitor_1, &coords);
		gtk_window_unmaximize (GTK_WINDOW (ev_dscwindow));
		gtk_window_move (GTK_WINDOW (ev_dscwindow), coords.x, coords.y);
		gtk_window_maximize (GTK_WINDOW (ev_dscwindow));
	}
	return TRUE;
}

static void
ev_dscwindow_sidebar_visibility(GtkWidget *sidebar)
{
	gtk_widget_set_visible (sidebar, !(gtk_widget_get_visible(sidebar)));
}

static void
ev_dscwindow_page_changed_cb (EvDocumentModel *model,
			   GParamSpec      *pspec,
			   EvDSCWindow     *ev_dscwindow)
{
	gint page = ev_document_model_get_page (model);
	if(page != ev_view_presentation_get_current_page (ev_dscwindow->priv->presentation_view)) {
		ev_view_presentation_set_page (EV_VIEW_PRESENTATION(ev_dscwindow->priv->presentation_view), page);
	if( ev_document_model_get_page (ev_dscwindow->priv->model) != page)
		ev_document_model_set_page(ev_dscwindow->priv->model, page);
	if( ev_document_model_get_page (ev_dscwindow->priv->notes_model) != page)
		ev_document_model_set_page(ev_dscwindow->priv->notes_model, page);
	}
}

static void
ev_dscwindow_presentation_page_changed_cb (EvViewPresentation *pview,
			   GParamSpec      *pspec,
			   EvDSCWindow     *ev_dscwindow)
{
	gint page = ev_view_presentation_get_current_page (pview);
	if( ev_document_model_get_page (ev_dscwindow->priv->model) != page)
		ev_document_model_set_page(ev_dscwindow->priv->model, page);
	if( ev_document_model_get_page (ev_dscwindow->priv->notes_model) != page)
		ev_document_model_set_page(ev_dscwindow->priv->notes_model, page);
}

/**
 * ev_dscwindow_notes_interaction: User wants to load a different file as notes.
 **/
static gboolean
ev_dscwindow_notes_interaction (GtkContainer *container, EvDSCWindow *ev_dscwindow)
{
	GtkWidget *dialog;

	dialog = gtk_file_chooser_dialog_new (
		_("Open Document"),
		GTK_WINDOW (ev_dscwindow),
		GTK_FILE_CHOOSER_ACTION_OPEN,
		GTK_STOCK_CANCEL, GTK_RESPONSE_REJECT,
		GTK_STOCK_OPEN, GTK_RESPONSE_ACCEPT,
		NULL);

	ev_document_factory_add_filters (dialog, NULL);
	gtk_file_chooser_set_select_multiple (GTK_FILE_CHOOSER (dialog), FALSE);
	gtk_file_chooser_set_local_only (GTK_FILE_CHOOSER (dialog), TRUE);

	if (gtk_dialog_run (GTK_DIALOG (dialog)) == GTK_RESPONSE_ACCEPT)
	{
		char * uri = gtk_file_chooser_get_uri (GTK_FILE_CHOOSER (dialog));
		GError * error = NULL;
		ev_view_set_loading (EV_VIEW (ev_dscwindow->priv->notesview), TRUE);

		if (ev_dscwindow->priv->notes_document) {
			ev_document_load (ev_dscwindow->priv->notes_document, uri, &error);
		} else {
			ev_dscwindow->priv->notes_document = ev_document_factory_get_document (uri,
				&error);
		}
		g_free (uri);
		if (error == NULL){
			ev_dscwindow->priv->notes_model = ev_document_model_new ();
			ev_document_model_set_document (ev_dscwindow->priv->notes_model, ev_dscwindow->priv->notes_document);
			ev_document_model_set_continuous (ev_dscwindow->priv->notes_model, FALSE);
			ev_document_model_set_dual_page (ev_dscwindow->priv->notes_model, FALSE);
			ev_document_model_set_sizing_mode (ev_dscwindow->priv->notes_model, EV_SIZING_BEST_FIT);
			ev_document_model_set_page (ev_dscwindow->priv->notes_model,
			        ev_document_model_get_page (ev_dscwindow->priv->model));
			ev_view_set_model(EV_VIEW(ev_dscwindow->priv->notesview),
					  ev_dscwindow->priv->notes_model);
			g_signal_connect (G_OBJECT(ev_dscwindow->priv->notes_model),
					  "notify::page",
					  G_CALLBACK (ev_dscwindow_page_changed_cb),
					  ev_dscwindow);
		}
	}
	gtk_widget_destroy (dialog);

	return TRUE;
}

/**
 * ev_dscwindow_get_control: Get the control instance.
 *
 * If there is none, create one.
 *
 * Returns: control instance
 **/
EvDSCWindow *
ev_dscwindow_get_control (void)
{
	static EvDSCWindow * control = NULL;

	if (!control || !EV_IS_DSCWINDOW (control)) {
		control = EV_DSCWINDOW (g_object_new (EV_TYPE_DSCWINDOW, NULL));
	}

	return control;
}

static void
ev_dscwindow_window_placement (EvDSCWindow *ev_dscwindow)
{
	gint num_monitors = get_num_monitors (GTK_WINDOW (ev_dscwindow));
	if (num_monitors == 2) {
		GtkWindow * presentation_window = GTK_WINDOW (ev_dscwindow->priv->presentation_window);
		GdkScreen * screen = gtk_window_get_screen (presentation_window);
		gint work_monitor = gdk_screen_get_monitor_at_window (screen,
			gtk_widget_get_window (GTK_WIDGET (presentation_window)));
		gint presentation_monitor = (work_monitor + 1) % 2;
		GdkRectangle coords;
		gdk_screen_get_monitor_geometry (screen, presentation_monitor,
			&coords);

		gtk_window_move (presentation_window, coords.x, coords.y);
		ev_dscwindow->priv->moveback_monitor = work_monitor;
		gtk_window_maximize (GTK_WINDOW (ev_dscwindow));
	}
}

static gboolean
ev_dscwindow_notes_clicked (GtkWidget *widget, GdkEvent *event,
	EvDSCWindow *self)
{
	if (!self || !EV_IS_DSCWINDOW (self) || !event)
		return FALSE;
	gint page = ev_document_model_get_page (self->priv->model);

	if (event->type == GDK_2BUTTON_PRESS && ((GdkEventButton *)event)->button == 1) {
		ev_dscwindow_notes_interaction (NULL, self);
	} else if (event->type == GDK_BUTTON_PRESS && ((GdkEventButton *)event)->button == 1) {
		ev_document_model_set_page (self->priv->model, page+1);
	} else if (event->type == GDK_BUTTON_PRESS && ((GdkEventButton *)event)->button == 3) {
		ev_document_model_set_page (self->priv->model, page-1);
	}
	return FALSE;
}

void
ev_dscwindow_set_presentation (EvDSCWindow *ev_dscwindow,
	EvWindow *presentation_window, EvDocument *document, EvViewPresentation *pview)
{
	if (!EV_IS_WINDOW (presentation_window))
		return;

	ev_dscwindow->priv->presentation_window = GTK_WIDGET(presentation_window);
	ev_dscwindow->priv->presentation_document = document;
	ev_dscwindow->priv->presentation_view = EV_VIEW_PRESENTATION(pview);
	ev_document_model_set_document(ev_dscwindow->priv->model, document);
	ev_document_model_set_page(ev_dscwindow->priv->model, ev_view_presentation_get_current_page (pview));
	g_signal_connect_swapped (ev_dscwindow->priv->presentation_view,
				  "destroy",
				  G_CALLBACK (gtk_widget_destroy),
				  ev_dscwindow);
	g_signal_connect (G_OBJECT(ev_dscwindow->priv->model),
			  "notify::page",
			  G_CALLBACK (ev_dscwindow_page_changed_cb),
			  ev_dscwindow);
	g_signal_connect (G_OBJECT(ev_dscwindow->priv->presentation_view),
			  "notify::page",
			  G_CALLBACK (ev_dscwindow_presentation_page_changed_cb),
			  ev_dscwindow);
	ev_dscwindow_window_placement (ev_dscwindow);
}

/**
 * ev_dscwindow_end: Destroy control window but keep presentation
 */
static gboolean
ev_dscwindow_end (GtkWidget *widget, GdkEvent *event)
{
	gtk_widget_destroy (GTK_WIDGET (ev_dscwindow_get_control ()));
	return TRUE;
}

/**
 * ev_dscwindow_init: Initialize multihead presentation
*
* @ev_dscwindow: EvDSCWindow.
*
* ev_dscwindow_set_presentation has to be called afterwards for loading in a document. TBD
**/
static void
ev_dscwindow_init (EvDSCWindow *ev_dscwindow)
{

	ev_dscwindow->priv = EV_DSCWINDOW_GET_PRIVATE (ev_dscwindow);
	ev_dscwindow->priv->moveback_monitor = -1;
	ev_dscwindow->priv->notes_document = NULL;

	gtk_window_set_title (GTK_WINDOW (ev_dscwindow), _("Presentation Control"));

	GtkWidget *hpaned = gtk_hpaned_new ();
	GtkWidget *vbox = gtk_vbox_new (FALSE, 0);

	ev_dscwindow->priv->model = ev_document_model_new ();
	ev_document_model_set_continuous (ev_dscwindow->priv->model, FALSE);
	ev_document_model_set_dual_page (ev_dscwindow->priv->model, FALSE);
	ev_document_model_set_sizing_mode (ev_dscwindow->priv->model, EV_SIZING_BEST_FIT);

	ev_dscwindow->priv->sidebar = ev_sidebar_new ();
	ev_sidebar_set_model (EV_SIDEBAR (ev_dscwindow->priv->sidebar),
			      ev_dscwindow->priv->model);
	GtkWidget *sidebar_widget;
	sidebar_widget = ev_sidebar_thumbnails_new ();
	gtk_widget_show (sidebar_widget);
	ev_sidebar_add_page (EV_SIDEBAR (ev_dscwindow->priv->sidebar),
			     sidebar_widget);
	gtk_widget_show (ev_dscwindow->priv->sidebar);
	gtk_paned_add1(GTK_PANED(hpaned), ev_dscwindow->priv->sidebar);

	ev_dscwindow->priv->notesview_scrolled_window = GTK_WIDGET (
	        g_object_new (GTK_TYPE_SCROLLED_WINDOW,"shadow-type",
				GTK_SHADOW_IN, NULL));
	gtk_paned_add2 (GTK_PANED (hpaned), ev_dscwindow->priv->notesview_scrolled_window);

	ev_dscwindow->priv->notesview = ev_view_new ();
	g_object_ref (ev_dscwindow->priv->notesview);
	gtk_container_add (GTK_CONTAINER (ev_dscwindow->priv->notesview_scrolled_window),
		ev_dscwindow->priv->notesview);
	ev_dscwindow->priv->notes_model = ev_dscwindow->priv->model;
	ev_view_set_model (EV_VIEW (ev_dscwindow->priv->notesview), ev_dscwindow->priv->notes_model);
	gtk_widget_show_all (hpaned);
	gtk_box_pack_start(GTK_BOX(vbox),hpaned,TRUE,TRUE,0);

	GtkWidget *expander = gtk_expander_new (_("Expensive features"));
	gtk_expander_set_expanded (GTK_EXPANDER (expander), TRUE);
	GtkWidget *toolbar = gtk_toolbar_new ();

	GtkToolItem *b_switch = gtk_tool_button_new (NULL, _("Switch monitors"));
	gtk_tool_button_set_icon_name (GTK_TOOL_BUTTON (b_switch), "object-flip-horizontal");
	gtk_toolbar_insert (GTK_TOOLBAR (toolbar), b_switch, -1);
	g_signal_connect (b_switch, "clicked",
		G_CALLBACK (ev_dscwindow_switch_monitors), ev_dscwindow);

	GtkToolItem *b_notes = gtk_tool_button_new_from_stock (GTK_STOCK_OPEN);
	gtk_tool_button_set_label (GTK_TOOL_BUTTON(b_notes), _("Load notes..."));
	gtk_toolbar_insert (GTK_TOOLBAR (toolbar), b_notes, -1);
	g_signal_connect (b_notes, "clicked",
		G_CALLBACK (ev_dscwindow_notes_interaction), ev_dscwindow);

	GtkToolItem *b_close = gtk_tool_button_new_from_stock (GTK_STOCK_CLOSE);
	gtk_tool_button_set_label (GTK_TOOL_BUTTON(b_close), _("End presentation"));
	gtk_toolbar_insert (GTK_TOOLBAR (toolbar), b_close, -1);
	g_signal_connect (b_close, "clicked",
		G_CALLBACK (ev_dscwindow_end), NULL);

	GtkToolItem *b_sidebar = gtk_tool_button_new_from_stock (GTK_STOCK_PAGE_SETUP);
	gtk_tool_button_set_label (GTK_TOOL_BUTTON(b_sidebar), _("Show sidebar"));
	gtk_toolbar_insert (GTK_TOOLBAR (toolbar), b_sidebar, -1);
	g_signal_connect_swapped (b_sidebar, "clicked",
		G_CALLBACK (ev_dscwindow_sidebar_visibility), ev_dscwindow->priv->sidebar);

	gtk_container_add (GTK_CONTAINER (expander), toolbar);
	gtk_box_pack_end (GTK_BOX (vbox), expander, FALSE, TRUE, 0);

//	gtk_drag_dest_unset (GTK_WIDGET (ev_dscwindow->priv->notesview));
//      gtk_drag_dest_unset (GTK_WIDGET (ev_dscwindow->priv->sidebar));

//	gint click = GDK_BUTTON1_MOTION_MASK | GDK_KEY_PRESS_MASK;
//	gtk_widget_add_events (GTK_WIDGET (ev_dscwindow->priv->sidebar), click);
	/* TODO: actions, this part is broken...*/
	/*g_signal_connect (ev_dscwindow->priv->notesview, "button-press-event",
			  G_CALLBACK (ev_dscwindow_notes_clicked), ev_dscwindow);*/

	gtk_widget_show_all(vbox);
	gtk_container_add (GTK_CONTAINER (ev_dscwindow), vbox);
}


static void
ev_dscwindow_dispose (GObject *obj)
{
	EvDSCWindow * ev_dscwindow = EV_DSCWINDOW (obj);
	EvDSCWindowPrivate *priv = ev_dscwindow->priv;

	if (priv->moveback_monitor >= 0) {
		GtkWindow * presentation_window = GTK_WINDOW (priv->presentation_window);
		GdkRectangle coords;

		gdk_screen_get_monitor_geometry (
			gtk_window_get_screen (presentation_window),
			priv->moveback_monitor, &coords);

		gtk_window_move (presentation_window, coords.x, coords.y);
	}
	ev_window_stop_presentation (EV_WINDOW(priv->presentation_window), TRUE);
	/*if (priv->overview) {
		g_object_unref (priv->overview);
		priv->overview = NULL;
	}*/


	G_OBJECT_CLASS (ev_dscwindow_parent_class)->dispose (obj);
}

static void
ev_dscwindow_class_init (EvDSCWindowClass *ev_dscwindow_class)
{
	GObjectClass *g_object_class = G_OBJECT_CLASS (ev_dscwindow_class);
	g_type_class_add_private (g_object_class, sizeof (EvDSCWindowPrivate));
	g_object_class->dispose  = ev_dscwindow_dispose;
}

GtkWidget *
ev_dscwindow_new (void)
{
	EvDSCWindow *ev_dscwindow;

	ev_dscwindow = g_object_new (EV_TYPE_DSCWINDOW, "type", GTK_WINDOW_TOPLEVEL, NULL);
	return GTK_WIDGET (ev_dscwindow);
}