/* -*- 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) 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 <string.h>
#include "evince-view.h"
#include "plugin.h"
#include "scriptable.h"

Plugin::Plugin (NPP instance) : mInstance (instance),
				mScriptableObject (0),
				mWindow (0),
				mDocument (0),
				mLoadJob (0),
				mFindJob (0),
				mTitle (0),
				mHasSelection (false),
				mCanFindOnPage (false)
{
	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));
	g_signal_connect (G_OBJECT (mView),
			  "notify::has-selection",
			  G_CALLBACK (Plugin::HasSelectionCallback),
			  reinterpret_cast<void*>(this));

	g_signal_connect (G_OBJECT (mView),
			  "external-link",
			  G_CALLBACK (Plugin::ExternalLinkCallback),
			  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);

	ev_view_find_set_highlight_search (EV_VIEW (mView), TRUE);

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

	UpdateSizingMode ();
}

Plugin::~Plugin ()
{
	ClearLoadJob ();
	ClearFindJob ();

	g_free (mTitle);

	if (mScriptableObject) {
		NPN_ReleaseObject (mScriptableObject);
		mScriptableObject = 0;
	}
}

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::SetZoom (double zoom)
{
	ev_view_set_sizing_mode (EV_VIEW (mView), EV_SIZING_FREE);
	ev_view_set_zoom (EV_VIEW (mView), zoom, FALSE);
}

double
Plugin::GetZoom (void) const
{
	return ev_view_get_zoom (EV_VIEW (mView));
}

void
Plugin::ClearFindJob ()
{
	if (!mFindJob)
		return;

	if (!ev_job_is_finished (mFindJob))
		ev_job_cancel (mFindJob);

	g_signal_handlers_disconnect_by_func (mFindJob,
					      (gpointer)Plugin::FindJobUpdatedCallback,
					      reinterpret_cast<void*> (this));

	g_object_unref (mFindJob);
	mFindJob = 0;
}

void
Plugin::Find (const char *text)
{
	if (!mDocument || !EV_IS_DOCUMENT_FIND (mDocument))
		return;

	ev_view_find_search_changed (EV_VIEW (mView));

	ClearFindJob ();

	if (text && text[0]) {
		EvPageCache *page_cache = ev_page_cache_get (mDocument);

		mFindJob = ev_job_find_new (mDocument,
					    ev_page_cache_get_current_page (page_cache),
					    ev_page_cache_get_n_pages (page_cache),
					    text, /*case_sensitive=*/ FALSE);
		g_signal_connect (mFindJob, "updated",
				  G_CALLBACK (Plugin::FindJobUpdatedCallback),
				  reinterpret_cast<void*> (this));
		ev_job_scheduler_push_job (mFindJob, EV_JOB_PRIORITY_NONE);
	} else {
		UpdateActions ();
		gtk_widget_queue_draw (mView);
	}
}

void
Plugin::FindNext ()
{
	ev_view_find_next (EV_VIEW (mView));
}

void
Plugin::FindPrevious ()
{
	ev_view_find_previous (EV_VIEW (mView));
}

void
Plugin::CopyClipboard ()
{
	ev_view_copy (EV_VIEW (mView));
}

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::ShowLoadingError ()
{
	/* FIXME display loading error in the UI */
}

void
Plugin::ClearLoadJob ()
{
        if (mLoadJob != NULL) {
                if (!ev_job_is_finished (mLoadJob))
                        ev_job_cancel (mLoadJob);

                g_signal_handlers_disconnect_by_func (
					mLoadJob,
					(gpointer)LoadJobFinishedCallback,
					reinterpret_cast<void*>(this));

                g_object_unref (mLoadJob);
                mLoadJob = NULL;
        }
}

void
Plugin::Load (const char *fname)
{
	GFile *file = g_file_new_for_path (fname);
	char *uri = g_file_get_uri (file);
	g_object_unref (file);

	ClearLoadJob ();

	mLoadJob = ev_job_load_new (uri);
	ev_job_scheduler_push_job (mLoadJob, EV_JOB_PRIORITY_NONE);
	g_signal_connect (mLoadJob, "finished",
			  G_CALLBACK (LoadJobFinishedCallback),
			  reinterpret_cast<void*>(this));
	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::CallBrowser(const char *function_name)
{
	ScriptablePluginObject *obj = static_cast<ScriptablePluginObject*> (mScriptableObject);
	if (obj) {
		obj->CallBrowser (function_name);
	}
}

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);

	switch (sizingMode) {
		case EV_SIZING_BEST_FIT:
		case EV_SIZING_FIT_WIDTH:
			ev_view_update_view_size (EV_VIEW (mView),
						  GTK_SCROLLED_WINDOW (mScrolledWindow));

			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 ();
}

void
Plugin::UpdateActions ()
{
	bool can_find = mFindJob &&
	                ev_job_find_has_results (EV_JOB_FIND (mFindJob));

	if (can_find != mCanFindOnPage) {
		mCanFindOnPage = can_find;
		CallBrowser ("onFindChanged");
	}
}

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

	gboolean has_selection = ev_view_get_has_selection (view);

	if (has_selection != plugin->mHasSelection) {
		plugin->mHasSelection = has_selection;
		plugin->CallBrowser ("onClipboardChanged");
	}
}

void
Plugin::ExternalLinkCallback (EvView *view, EvLinkAction *action, gpointer data)
{
	Plugin *plugin = reinterpret_cast<Plugin*> (data);
	const char *uri = NULL;

	switch (ev_link_action_get_action_type (action)) {
		case EV_LINK_ACTION_TYPE_EXTERNAL_URI:
			uri = ev_link_action_get_uri (action);

			if (g_strstr_len (uri, strlen (uri), "http")) {
				NPN_GetURL (plugin->mInstance, uri, "_blank");
			}

			break;
		default:
			break;
	}
}

void
Plugin::LoadJobFinishedCallback (EvJob *job, gpointer data)
{
	Plugin *plugin = reinterpret_cast<Plugin*> (data);

	if (!ev_job_is_failed (job)) {
		// let EvView own the document and mDocument have weak ref
		plugin->mDocument = EV_JOB (job)->document;

		ev_view_set_document (EV_VIEW(plugin->mView),
				      plugin->mDocument);

		EvDocumentInfo *doc_info = ev_document_get_info (plugin->mDocument);
		if (doc_info) {
			if (doc_info->fields_mask & EV_DOCUMENT_INFO_TITLE) {

				plugin->mTitle = g_strdup (doc_info->title);

				plugin->CallBrowser ("onTitleChanged");
			}

			ev_document_info_free (doc_info);
		}
	} else {
		plugin->mDocument = 0;

		plugin->ShowLoadingError ();
	}

	plugin->ClearLoadJob ();
}

void
Plugin::FindJobUpdatedCallback (EvJobFind *job, gint page, gpointer data)
{
	Plugin *plugin = reinterpret_cast<Plugin*> (data);

	plugin->UpdateActions ();

	ev_view_find_changed (EV_VIEW (plugin->mView),
			      ev_job_find_get_results (job),
			      page);
}