/*
 * Web view
 *
 * Copyright (C) 2017  Patrick McDermott
 *
 * This file is part of Marquee.
 *
 * Marquee 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 3 of the License, or
 * (at your option) any later version.
 *
 * Marquee 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 Marquee.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "web-view.h"

#include <stdlib.h>
#include <string.h>

#include <glib.h>
#include <gtk/gtk.h>
#include <webkit2/webkit2.h>

#include "config.h"
#include "notebook.h"
#include "tab-page.h"

struct _MqWebView {
	WebKitWebView        parent_instance;
	MqTabPage           *tab_page;
	gchar               *uri;
	MqConfig            *config;
	WebKitHitTestResult *hit_test_result;
	WebKitHitTestResult *mouse_target_hit_test_result;
	GtkComboBox         *save_type_combo_box;
	GFile               *save_file;
};

enum {
	PROP_TAB_PAGE = 1,
	PROP_REWRITTEN_URI,
	N_PROPERTIES
};

static GParamSpec *obj_properties[N_PROPERTIES] = {NULL,};

struct _MqWebViewClass {
	WebKitWebViewClass parent_class;
};

G_DEFINE_TYPE(MqWebView, mq_web_view, WEBKIT_TYPE_WEB_VIEW)

#define WKCMA(ACTION) \
	WEBKIT_CONTEXT_MENU_ACTION_##ACTION

static void
menu_open_link_activate_cb(GtkAction G_GNUC_UNUSED *action, MqWebView *web_view)
{
	webkit_web_view_load_uri(WEBKIT_WEB_VIEW(web_view),
		webkit_hit_test_result_get_link_uri(
			web_view->hit_test_result));
}

static void
menu_open_link_tab_activate_cb(GtkAction G_GNUC_UNUSED *action,
	MqWebView *web_view)
{
	mq_notebook_insert_child(
		MQ_NOTEBOOK(gtk_widget_get_parent(
				GTK_WIDGET(web_view->tab_page))),
		webkit_hit_test_result_get_link_uri(web_view->hit_test_result),
		web_view->tab_page,
		!mq_config_get_boolean(web_view->config, "tabs.background"));
}

static void
menu_open_link_win_activate_cb(GtkAction G_GNUC_UNUSED *action,
	MqWebView *web_view)
{
	const gchar *uris[2] = {
		webkit_hit_test_result_get_link_uri(web_view->hit_test_result),
		NULL
	};
	mq_application_add_window(
		mq_tab_page_get_application(web_view->tab_page), uris);
}

static void
menu_open_image_activate_cb(GtkAction G_GNUC_UNUSED *action,
	MqWebView *web_view)
{
	webkit_web_view_load_uri(WEBKIT_WEB_VIEW(web_view),
		webkit_hit_test_result_get_image_uri(
			web_view->hit_test_result));
}

static void
menu_open_image_tab_activate_cb(GtkAction G_GNUC_UNUSED *action,
	MqWebView *web_view)
{
	mq_notebook_insert_child(
		MQ_NOTEBOOK(gtk_widget_get_parent(
				GTK_WIDGET(web_view->tab_page))),
		webkit_hit_test_result_get_image_uri(web_view->hit_test_result),
		web_view->tab_page,
		!mq_config_get_boolean(web_view->config, "tabs.background"));
}

static void
menu_open_image_win_activate_cb(GtkAction G_GNUC_UNUSED *action,
	MqWebView *web_view)
{
	const gchar *uris[2] = {
		webkit_hit_test_result_get_image_uri(web_view->hit_test_result),
		NULL
	};
	mq_application_add_window(
		mq_tab_page_get_application(web_view->tab_page), uris);
}

static void
menu_open_video_activate_cb(GtkAction G_GNUC_UNUSED *action,
	MqWebView *web_view)
{
	webkit_web_view_load_uri(WEBKIT_WEB_VIEW(web_view),
		webkit_hit_test_result_get_media_uri(
			web_view->hit_test_result));
}

static void
menu_open_video_tab_activate_cb(GtkAction G_GNUC_UNUSED *action,
	MqWebView *web_view)
{
	mq_notebook_insert_child(
		MQ_NOTEBOOK(gtk_widget_get_parent(
				GTK_WIDGET(web_view->tab_page))),
		webkit_hit_test_result_get_media_uri(web_view->hit_test_result),
		web_view->tab_page,
		!mq_config_get_boolean(web_view->config, "tabs.background"));
}

static void
menu_open_video_win_activate_cb(GtkAction G_GNUC_UNUSED *action,
	MqWebView *web_view)
{
	const gchar *uris[2] = {
		webkit_hit_test_result_get_media_uri(web_view->hit_test_result),
		NULL
	};
	mq_application_add_window(
		mq_tab_page_get_application(web_view->tab_page), uris);
}

static void
menu_open_audio_activate_cb(GtkAction G_GNUC_UNUSED *action,
	MqWebView *web_view)
{
	webkit_web_view_load_uri(WEBKIT_WEB_VIEW(web_view),
		webkit_hit_test_result_get_media_uri(
			web_view->hit_test_result));
}

static void
menu_open_audio_tab_activate_cb(GtkAction G_GNUC_UNUSED *action,
	MqWebView *web_view)
{
	mq_notebook_insert_child(
		MQ_NOTEBOOK(gtk_widget_get_parent(
				GTK_WIDGET(web_view->tab_page))),
		webkit_hit_test_result_get_media_uri(web_view->hit_test_result),
		web_view->tab_page,
		!mq_config_get_boolean(web_view->config, "tabs.background"));
}

static void
menu_open_audio_win_activate_cb(GtkAction G_GNUC_UNUSED *action,
	MqWebView *web_view)
{
	const gchar *uris[2] = {
		webkit_hit_test_result_get_media_uri(web_view->hit_test_result),
		NULL
	};
	mq_application_add_window(
		mq_tab_page_get_application(web_view->tab_page), uris);
}

#define ITEM_DECLS \
	GtkAction             *action; \
	WebKitContextMenuItem *menu_item;
#define ITEM_DECLS_NO_CUSTOM \
	WebKitContextMenuItem *menu_item;
#define NEW_CUSTOM_ITEM(NAME, LABEL) \
	G_STMT_START { \
		/* Don't blame me; blame WebKitGTK+ for using GtkAction. */ \
		G_GNUC_BEGIN_IGNORE_DEPRECATIONS \
		action = gtk_action_new(#NAME, (LABEL), NULL, NULL); \
		G_GNUC_END_IGNORE_DEPRECATIONS \
		g_signal_connect(action, "activate", \
			G_CALLBACK(menu_##NAME##_activate_cb), web_view); \
		menu_item = webkit_context_menu_item_new(action); \
		webkit_context_menu_append(context_menu, menu_item); \
	} G_STMT_END
#define NEW_STOCK_ITEM(STOCK) \
	G_STMT_START { \
		menu_item = webkit_context_menu_item_new_from_stock_action( \
			WEBKIT_CONTEXT_MENU_ACTION_##STOCK); \
		webkit_context_menu_append(context_menu, menu_item); \
	} G_STMT_END
#define NEW_SEPARATOR_ITEM() \
	G_STMT_START { \
		webkit_context_menu_append(context_menu, \
			webkit_context_menu_item_new_separator()); \
	} G_STMT_END
#define RESTORE_ITEMS(ITEMS) \
	G_STMT_START { \
		for (; ITEMS; ITEMS = ITEMS->next) { \
			webkit_context_menu_append(context_menu, ITEMS->data); \
			g_object_unref(ITEMS->data); \
		} \
	} G_STMT_END

static void
context_menu_link_cb(WebKitContextMenu *context_menu, MqWebView *web_view)
{
	ITEM_DECLS

	NEW_CUSTOM_ITEM(open_link,     "_Open Link");
	NEW_CUSTOM_ITEM(open_link_tab, "Open Link in New _Tab");
	NEW_CUSTOM_ITEM(open_link_win, "Open Link in New _Window");
	NEW_SEPARATOR_ITEM();                    /* --- */
	NEW_STOCK_ITEM(DOWNLOAD_LINK_TO_DISK);   /* _Download Linked File */
	NEW_STOCK_ITEM(COPY_LINK_TO_CLIPBOARD);  /* Copy Link Loc_ation */
}

static void
context_menu_image_cb(WebKitContextMenu *context_menu, MqWebView *web_view)
{
	ITEM_DECLS

	NEW_CUSTOM_ITEM(open_image,     "Open _Image");
	NEW_CUSTOM_ITEM(open_image_tab, "Open Image in New Tab");
	NEW_CUSTOM_ITEM(open_image_win, "Open Image in New Window");
	NEW_SEPARATOR_ITEM();                         /* --- */
	NEW_STOCK_ITEM(DOWNLOAD_IMAGE_TO_DISK);       /* Sa_ve Image As */
	NEW_STOCK_ITEM(COPY_IMAGE_TO_CLIPBOARD);      /* Cop_y Image */
	NEW_STOCK_ITEM(COPY_IMAGE_URL_TO_CLIPBOARD);  /* Copy Image _Address */
}

static void
context_menu_media_cb(WebKitContextMenu *context_menu, GList *media_ctrl_items,
	GList *media_toggle_items, gboolean is_video, MqWebView *web_view)
{
	ITEM_DECLS

	/* _Play/_Pause, _Mute */
	RESTORE_ITEMS(media_ctrl_items);
	/* _Toggle Media Controls, Toggle Media _Loop Playback, Switch Video to
	 * _Fullscreen */
	RESTORE_ITEMS(media_toggle_items);
	NEW_SEPARATOR_ITEM();  /* --- */
	if (is_video) {
		NEW_CUSTOM_ITEM(open_video,     "_Open Video");
		NEW_CUSTOM_ITEM(open_video_tab, "Open Video in New Tab");
		NEW_CUSTOM_ITEM(open_video_win, "Open Video in New Window");
		NEW_SEPARATOR_ITEM();  /* --- */
		NEW_STOCK_ITEM(DOWNLOAD_VIDEO_TO_DISK);  /* Download _Video */
		/* Cop_y Video Link Location */
		NEW_STOCK_ITEM(COPY_VIDEO_LINK_TO_CLIPBOARD);
	} else {
		NEW_CUSTOM_ITEM(open_audio,     "_Open Audio");
		NEW_CUSTOM_ITEM(open_audio_tab, "Open Audio in New Tab");
		NEW_CUSTOM_ITEM(open_audio_win, "Open Audio in New Window");
		NEW_SEPARATOR_ITEM();  /* --- */
		NEW_STOCK_ITEM(DOWNLOAD_AUDIO_TO_DISK);  /* Download _Audio */
		/* Cop_y Audio Link Location */
		NEW_STOCK_ITEM(COPY_AUDIO_LINK_TO_CLIPBOARD);
	}
}

static void
context_menu_editable_cb(WebKitContextMenu *context_menu,
	GList *spell_repl_items, GList *spell_ctrl_items, GList *edit_items,
	GList *input_items, MqWebView G_GNUC_UNUSED *web_view)
{
	ITEM_DECLS_NO_CUSTOM

	RESTORE_ITEMS(spell_repl_items); /* Spelling suggestions */
	NEW_SEPARATOR_ITEM();            /* --- */
	RESTORE_ITEMS(spell_ctrl_items); /* _Ignore Spelling, _Learn Spelling */
	NEW_SEPARATOR_ITEM();            /* --- */
	RESTORE_ITEMS(edit_items);       /* Cu_t, _Copy, _Paste, _Delete */
	NEW_SEPARATOR_ITEM();            /* --- */
	NEW_STOCK_ITEM(SELECT_ALL);      /* Select _All */
	NEW_SEPARATOR_ITEM();            /* --- */
	RESTORE_ITEMS(input_items);      /* _Insert Unicode Character */
}
static void
context_menu_document_cb(WebKitContextMenu *context_menu, GList *nav_items,
	MqWebView G_GNUC_UNUSED *web_view)
{
	ITEM_DECLS_NO_CUSTOM

	RESTORE_ITEMS(nav_items);    /* _Back, _Forward, _Stop, _Reload */
	NEW_SEPARATOR_ITEM();        /* --- */
	NEW_STOCK_ITEM(SELECT_ALL);  /* Select _All */
	NEW_SEPARATOR_ITEM();        /* --- */
	/* View Page Source */
}

#define PRESERVE_ITEM(ITEMS) \
	G_STMT_START { \
		g_object_ref(items->data); \
		ITEMS = g_list_prepend(ITEMS, items->data); \
	} G_STMT_END

static gboolean
context_menu_cb(WebKitWebView *wk_web_view, WebKitContextMenu *context_menu,
	GdkEvent G_GNUC_UNUSED *event, WebKitHitTestResult *hit_test_result)
{
	MqWebView                  *web_view;
	GList                      *items;
	GList                      *nav_items;
	GList                      *edit_items;
	GList                      *input_items;
	GList                      *spell_repl_items;
	GList                      *spell_ctrl_items;
	GList                      *media_ctrl_items;
	GList                      *media_toggle_items;
	gboolean                    is_selection;
	gboolean                    is_video;
	WebKitContextMenuAction     stock_action;
	WebKitHitTestResultContext  context;
	gboolean                    context_handled;
	WebKitContextMenuItem      *menu_item;

	web_view = MQ_WEB_VIEW(wk_web_view);

	/* Get more hints about the context, since WebKit doesn't describe
	 * context very well in hit test results.  Also, preserve menu items
	 * that aren't easy to reproduce (e.g. the Unicode menu and spelling
	 * guesses). */
	items = webkit_context_menu_get_items(context_menu);
	nav_items          = NULL;
	edit_items         = NULL;
	input_items        = NULL;
	spell_repl_items   = NULL;
	spell_ctrl_items   = NULL;
	media_ctrl_items   = NULL;
	media_toggle_items = NULL;
	is_selection = FALSE;
	is_video = FALSE;
	for (; items; items = items->next) {
		stock_action = webkit_context_menu_item_get_stock_action(
			items->data);
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wswitch"
		switch (stock_action) {
			case WKCMA(GO_BACK):
			case WKCMA(GO_FORWARD):
			case WKCMA(STOP):
			case WKCMA(RELOAD):
				PRESERVE_ITEM(nav_items);
				break;
			case WKCMA(COPY):
				PRESERVE_ITEM(edit_items);
				is_selection = TRUE;
				break;
			case WKCMA(CUT):
			case WKCMA(PASTE):
			case WKCMA(DELETE):
				PRESERVE_ITEM(edit_items);
				break;
			case WKCMA(INPUT_METHODS):
			case WKCMA(UNICODE):
				PRESERVE_ITEM(input_items);
				break;
			case WKCMA(SPELLING_GUESS):
			case WKCMA(NO_GUESSES_FOUND):
				PRESERVE_ITEM(spell_repl_items);
				break;
			case WKCMA(IGNORE_SPELLING):
			case WKCMA(LEARN_SPELLING):
			case WKCMA(IGNORE_GRAMMAR):
				PRESERVE_ITEM(spell_ctrl_items);
				break;
			case WKCMA(OPEN_VIDEO_IN_NEW_WINDOW):
			case WKCMA(COPY_VIDEO_LINK_TO_CLIPBOARD):
			case WKCMA(DOWNLOAD_VIDEO_TO_DISK):
				is_video = TRUE;
				break;
			case WKCMA(OPEN_AUDIO_IN_NEW_WINDOW):
			case WKCMA(COPY_AUDIO_LINK_TO_CLIPBOARD):
			case WKCMA(DOWNLOAD_AUDIO_TO_DISK):
				is_video = FALSE;
				break;
			case WKCMA(TOGGLE_MEDIA_CONTROLS):
			case WKCMA(TOGGLE_MEDIA_LOOP):
			case WKCMA(ENTER_VIDEO_FULLSCREEN):
				PRESERVE_ITEM(media_toggle_items);
				break;
			case WKCMA(MEDIA_PLAY):
			case WKCMA(MEDIA_PAUSE):
			case WKCMA(MEDIA_MUTE):
				PRESERVE_ITEM(media_ctrl_items);
				break;
		}
#pragma GCC diagnostic pop
	}
	nav_items          = g_list_reverse(nav_items);
	edit_items         = g_list_reverse(edit_items);
	input_items        = g_list_reverse(input_items);
	spell_repl_items   = g_list_reverse(spell_repl_items);
	spell_ctrl_items   = g_list_reverse(spell_ctrl_items);
	media_ctrl_items   = g_list_reverse(media_ctrl_items);
	media_toggle_items = g_list_reverse(media_toggle_items);

	/* Clear the menu. */
	webkit_context_menu_remove_all(context_menu);

	/* Get the reported context (which isn't very descriptive) and save the
	 * hit test result for use by action callbacks. */
	context = webkit_hit_test_result_get_context(hit_test_result);
	if (web_view->hit_test_result) {
		g_object_unref(web_view->hit_test_result);
	}
	web_view->hit_test_result = hit_test_result;
	g_object_ref(web_view->hit_test_result);
	context_handled = FALSE;

	/* Build the context menu. */
	if (context & WEBKIT_HIT_TEST_RESULT_CONTEXT_LINK) {
		context_menu_link_cb(context_menu, web_view);
		context_handled = TRUE;
	}
	if (context & WEBKIT_HIT_TEST_RESULT_CONTEXT_IMAGE) {
		if (context_handled) {
			NEW_SEPARATOR_ITEM();
		}
		context_menu_image_cb(context_menu, web_view);
		context_handled = TRUE;
	}
	if (context & WEBKIT_HIT_TEST_RESULT_CONTEXT_MEDIA) {
		context_menu_media_cb(context_menu, media_ctrl_items,
			media_toggle_items, is_video, web_view);
		context_handled = TRUE;
	}
	if (context & WEBKIT_HIT_TEST_RESULT_CONTEXT_EDITABLE) {
		context_menu_editable_cb(context_menu, spell_repl_items,
			spell_ctrl_items, edit_items, input_items, web_view);
		context_handled = TRUE;
	}
	if (!context_handled &&
			context & WEBKIT_HIT_TEST_RESULT_CONTEXT_DOCUMENT) {
		if (is_selection) {
			RESTORE_ITEMS(edit_items);  /* _Copy */
			context_handled = TRUE;
		} else {
			context_menu_document_cb(context_menu, nav_items,
				web_view);
			context_handled = TRUE;
		}
	}
	if (context & WEBKIT_HIT_TEST_RESULT_CONTEXT_DOCUMENT) {
		if (context_handled) {
			NEW_SEPARATOR_ITEM();
		}
		NEW_STOCK_ITEM(INSPECT_ELEMENT);  /* Inspect Element */
	}

	/* Propagate the event further and show the context menu. */
	return FALSE;
}

static void
uri_cb(WebKitWebView *wk_web_view, GParamSpec G_GNUC_UNUSED *param_spec)
{
	const gchar *uri;
	MqWebView   *web_view;

	web_view = MQ_WEB_VIEW(wk_web_view);

	if (web_view->uri) {
		g_free(web_view->uri);
	}

	uri = webkit_web_view_get_uri(wk_web_view);

	if (g_str_has_prefix(uri, "mq-about:")) {
		web_view->uri = g_strconcat("about:", uri + strlen("mq-about:"),
			NULL);
	} else {
		web_view->uri = g_strdup(uri);
	}

	g_object_notify_by_pspec(G_OBJECT(web_view),
		obj_properties[PROP_REWRITTEN_URI]);
}

static void
clipboard_text_recv_cb(GtkClipboard G_GNUC_UNUSED *clipboard,
	const gchar *text, MqWebView *web_view)
{
	webkit_web_view_load_uri(WEBKIT_WEB_VIEW(web_view), text);
}

/* This callback is a hack to determine on middle mouse click whether to open a
 * link in a new tab or to load a URI from the primary clipboard.  The WebKit1
 * API provided webkit_web_view_get_hit_test_result() which would have been
 * easier. */
static void
mouse_target_changed_cb(WebKitWebView *wk_web_view,
	WebKitHitTestResult *hit_test_result, guint G_GNUC_UNUSED modifiers)
{
	MqWebView *web_view;

	web_view = MQ_WEB_VIEW(wk_web_view);

	web_view->mouse_target_hit_test_result = hit_test_result;
	g_object_ref(web_view->mouse_target_hit_test_result);
}

static gboolean
button_press_cb(GtkWidget *widget, GdkEventButton *event)
{
	MqWebView           *web_view;
	WebKitHitTestResult *hit_test_result;
	GtkClipboard        *clipboard;

	web_view = MQ_WEB_VIEW(widget);

	/* Make sure this is a middle mouse button press event. */
	if (event->button != 2) {
		return FALSE;
	}

	hit_test_result = web_view->mouse_target_hit_test_result;

	if (webkit_hit_test_result_context_is_link(hit_test_result)) {
		mq_notebook_insert_child(
			MQ_NOTEBOOK(gtk_widget_get_parent(
					GTK_WIDGET(web_view->tab_page))),
			webkit_hit_test_result_get_link_uri(hit_test_result),
			web_view->tab_page,
			!mq_config_get_boolean(web_view->config,
				"tabs.background"));
	} else if (webkit_hit_test_result_context_is_editable(hit_test_result)){
		/* Let WebKit handle pasting from the primary clipboard into an
		 * editable element. */
		g_object_unref(hit_test_result);
		return FALSE;
	} else {
		clipboard = gtk_clipboard_get(GDK_SELECTION_PRIMARY);
		gtk_clipboard_request_text(clipboard,
			(GtkClipboardTextReceivedFunc) clipboard_text_recv_cb,
			web_view);
	}

	g_object_unref(hit_test_result);

	return TRUE;
}

static void
constructed(GObject *object)
{
	MqWebView *web_view;
	gchar    *rw_uri;
	gchar    *new_tab_page;

	if (G_OBJECT_CLASS(mq_web_view_parent_class)->constructed) {
		G_OBJECT_CLASS(mq_web_view_parent_class)->constructed(object);
	}

	web_view = MQ_WEB_VIEW(object);

	web_view->config = mq_application_get_config(
		mq_tab_page_get_application(web_view->tab_page));

	webkit_web_view_set_settings(WEBKIT_WEB_VIEW(web_view),
		mq_application_get_webkit_settings(
			mq_tab_page_get_application(web_view->tab_page)));

	if (web_view->uri) {
		if (g_str_has_prefix(web_view->uri, "about:")) {
			rw_uri = g_strconcat("mq-about:",
				web_view->uri + strlen("about:"), NULL);
			webkit_web_view_load_uri(WEBKIT_WEB_VIEW(web_view),
				rw_uri);
			g_free(rw_uri);
		} else {
			webkit_web_view_load_uri(WEBKIT_WEB_VIEW(web_view),
				web_view->uri);
		}
	} else {
		new_tab_page = mq_config_get_string(web_view->config,
			"tabs.new");
		if (g_strcmp0(new_tab_page, "home") == 0) {
			webkit_web_view_load_uri(WEBKIT_WEB_VIEW(web_view),
				mq_config_get_string(web_view->config,
					"tabs.home"));
		} else if (g_strcmp0(new_tab_page, "blank") == 0) {
			/* Don't load any URI. */
		} else {
			g_assert_not_reached();
		}
	}

	mq_web_view_zoom_reset(web_view);

	gtk_widget_set_vexpand(GTK_WIDGET(web_view), TRUE);
	/* FIXME: This doesn't seem to be working. */
	gtk_widget_grab_focus(GTK_WIDGET(web_view));
}

static void
finalize(GObject *object)
{
	MqWebView *web_view;

	web_view = MQ_WEB_VIEW(object);

	if (web_view->uri) {
		g_free(web_view->uri);
	}

	G_OBJECT_CLASS(mq_web_view_parent_class)->finalize(object);
}

static void
get_property(GObject *object, guint property_id, GValue *value,
	GParamSpec *param_spec)
{
	MqWebView *web_view;

	web_view = MQ_WEB_VIEW(object);

	switch (property_id) {
		case PROP_TAB_PAGE:
			g_value_set_object(value, web_view->tab_page);
			break;
		case PROP_REWRITTEN_URI:
			g_value_set_string(value, web_view->uri);
			break;
		default:
			G_OBJECT_WARN_INVALID_PROPERTY_ID(object, property_id,
				param_spec);
			break;
	}
}

static void
set_property(GObject *object, guint property_id, const GValue *value,
	GParamSpec *param_spec)
{
	MqWebView *web_view;

	web_view = MQ_WEB_VIEW(object);

	switch (property_id) {
		case PROP_TAB_PAGE:
			web_view->tab_page = g_value_get_object(value);
			break;
		case PROP_REWRITTEN_URI:
			mq_web_view_load_uri(web_view,
				g_value_get_string(value));
			break;
		default:
			G_OBJECT_WARN_INVALID_PROPERTY_ID(object, property_id,
				param_spec);
			break;
	}
}

static void
mq_web_view_class_init(MqWebViewClass *klass)
{
	GObjectClass *object_class = G_OBJECT_CLASS(klass);

	object_class->constructed  = constructed;
	object_class->finalize     = finalize;
	object_class->get_property = get_property;
	object_class->set_property = set_property;

	obj_properties[PROP_TAB_PAGE] = g_param_spec_object(
		"tab-page",
		"MqTabPage",
		"The parent MqTabPage instance",
		MQ_TYPE_TAB_PAGE,
		G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY |
		G_PARAM_STATIC_NICK | G_PARAM_STATIC_BLURB);
	obj_properties[PROP_REWRITTEN_URI] = g_param_spec_string(
		"rewritten-uri",
		"URI",
		"The current active URI of the Web view, "
			"with \"mq-about:\" rewritten to \"about:\"",
		"",
		G_PARAM_READWRITE |
		G_PARAM_STATIC_NICK | G_PARAM_STATIC_BLURB);
	g_object_class_install_properties(object_class, N_PROPERTIES,
		obj_properties);
}

static void
mq_web_view_init(MqWebView *web_view)
{
	web_view->hit_test_result = NULL;

	g_signal_connect(web_view, "context-menu",
		G_CALLBACK(context_menu_cb), NULL);
	g_signal_connect(web_view, "notify::uri",
		G_CALLBACK(uri_cb), NULL);
	g_signal_connect(web_view, "mouse-target-changed",
		G_CALLBACK(mouse_target_changed_cb), NULL);
	g_signal_connect(web_view, "button-press-event",
		G_CALLBACK(button_press_cb), NULL);
}

MqWebView *
mq_web_view_new(MqTabPage *tab_page, const gchar *uri)
{
	return g_object_new(MQ_TYPE_WEB_VIEW,
		"tab-page", tab_page,  /* TODO: Use gtk_widget_get_parent()? */
		"rewritten-uri", uri,
		"web-context", webkit_web_context_get_default(),
		NULL);
}

const gchar *
mq_web_view_get_uri(MqWebView *web_view)
{
	return web_view->uri;
}

void
mq_web_view_load_uri(MqWebView *web_view, const gchar *uri)
{
	gchar *rw_uri;

	if (!uri) {
		/* Happens during object construction. */
		return;
	}

	if (web_view->uri) {
		g_free(web_view->uri);
	}
	web_view->uri = g_strdup(uri);

	if (g_str_has_prefix(uri, "about:")) {
		rw_uri = g_strconcat("mq-about:", uri + strlen("about:"), NULL);
		webkit_web_view_load_uri(WEBKIT_WEB_VIEW(web_view), rw_uri);
		g_free(rw_uri);
	} else {
		webkit_web_view_load_uri(WEBKIT_WEB_VIEW(web_view), uri);
	}

	g_object_notify_by_pspec(G_OBJECT(web_view),
		obj_properties[PROP_REWRITTEN_URI]);
}

void
mq_web_view_zoom_in(MqWebView *web_view)
{
	gdouble zoom_level;

	zoom_level = webkit_web_view_get_zoom_level(WEBKIT_WEB_VIEW(web_view));
	zoom_level += 0.1;
	if (zoom_level < 0) {
		zoom_level = G_MAXDOUBLE;
	}
	webkit_web_view_set_zoom_level(WEBKIT_WEB_VIEW(web_view), zoom_level);
}

void
mq_web_view_zoom_out(MqWebView *web_view)
{
	gdouble zoom_level;

	zoom_level = webkit_web_view_get_zoom_level(WEBKIT_WEB_VIEW(web_view));
	zoom_level -= 0.1;
	if (zoom_level < 0) {
		zoom_level = 0;
	}
	webkit_web_view_set_zoom_level(WEBKIT_WEB_VIEW(web_view), zoom_level);
}

void
mq_web_view_zoom_reset(MqWebView *web_view)
{
	gdouble zoom_level;

	zoom_level = mq_config_get_double(web_view->config, "zoom.default");
	webkit_web_view_set_zoom_level(WEBKIT_WEB_VIEW(web_view), zoom_level);
}

static void
add_chooser_filters(GtkFileChooser *chooser)
{
	GtkFileFilter  *filter;

	filter = gtk_file_filter_new();
	gtk_file_filter_set_name(filter, "All files");
	gtk_file_filter_add_pattern(filter, "*");
	gtk_file_chooser_add_filter(chooser, filter);

	filter = gtk_file_filter_new();
	gtk_file_filter_set_name(filter, "All Web pages");
	gtk_file_filter_add_pattern(filter, "*.htm");
	gtk_file_filter_add_pattern(filter, "*.html");
	gtk_file_filter_add_pattern(filter, "*.mht");
	gtk_file_filter_add_pattern(filter, "*.mhtm");
	gtk_file_filter_add_pattern(filter, "*.mhtml");
	gtk_file_chooser_add_filter(chooser, filter);

	filter = gtk_file_filter_new();
	gtk_file_filter_set_name(filter, "HTML documents (*.htm, *.html)");
	gtk_file_filter_add_pattern(filter, "*.htm");
	gtk_file_filter_add_pattern(filter, "*.html");
	gtk_file_chooser_add_filter(chooser, filter);

	filter = gtk_file_filter_new();
	gtk_file_filter_set_name(filter,
		"MHTML documents (*.mht, *.mhtm, *.mhtml)");
	gtk_file_filter_add_pattern(filter, "*.mht");
	gtk_file_filter_add_pattern(filter, "*.mhtm");
	gtk_file_filter_add_pattern(filter, "*.mhtml");
	gtk_file_chooser_add_filter(chooser, filter);
}

static void
open_response_cb(GtkWidget *dialog, gint response_id, MqWebView *web_view)
{
	gchar *dir;
	gchar *filename;
	gchar *uri;

	if (response_id == GTK_RESPONSE_ACCEPT) {
		dir = gtk_file_chooser_get_current_folder(
			GTK_FILE_CHOOSER(dialog));
		if (dir) {
			mq_config_set_string(web_view->config,
				"directories.open-file", dir);
			g_free(dir);
			mq_config_save(web_view->config);
		}
		filename = gtk_file_chooser_get_filename(
			GTK_FILE_CHOOSER(dialog));
		uri = g_strconcat("file://", filename, NULL);
		g_free(filename);
		webkit_web_view_load_uri(WEBKIT_WEB_VIEW(web_view), uri);
		g_free(uri);
	}

	gtk_widget_destroy(dialog);
}

void
mq_web_view_open(MqWebView *web_view)
{
	GtkWidget *dialog;
	GtkFileChooser *chooser;
	gchar          *dir;

	dialog = gtk_file_chooser_dialog_new("Open File",
		GTK_WINDOW(mq_tab_page_get_window(web_view->tab_page)),
		GTK_FILE_CHOOSER_ACTION_OPEN,
		"_Cancel", GTK_RESPONSE_CANCEL,
		"_Open",   GTK_RESPONSE_ACCEPT,
		NULL);
	chooser = GTK_FILE_CHOOSER(dialog);

	dir = mq_config_get_string(web_view->config, "directories.open-file");
	if (dir && dir[0]) {
		gtk_file_chooser_set_current_folder(chooser, dir);
	}
	/* TODO: Consider setting chooser's folder from current file-scheme URI,
	 * if any. */
	g_free(dir);

	add_chooser_filters(chooser);

	g_signal_connect(dialog, "response",
		G_CALLBACK(open_response_cb), web_view);
	gtk_widget_show_all(dialog);
}

static void
save_html_replace_cb(GFile *file, GAsyncResult *result)
{
	g_file_replace_contents_finish(file, result, NULL, NULL);
	/* TODO: Error handling? */
}

static void
save_html_get_data_cb(WebKitWebResource *resource, GAsyncResult *result,
	MqWebView *web_view)
{
	guchar *data;
	gsize   length;

	data = webkit_web_resource_get_data_finish(resource, result, &length,
		NULL);  /* TODO: Error handling? */
	g_file_replace_contents_async(web_view->save_file,
		(gchar *) data, length,
		NULL, FALSE, G_FILE_CREATE_REPLACE_DESTINATION, NULL,
		(GAsyncReadyCallback) save_html_replace_cb, NULL);
}

static void
save_mhtml_cb(WebKitWebView *web_view, GAsyncResult *result)
{
	webkit_web_view_save_to_file_finish(web_view, result, NULL);
}

static const gchar *
get_extension(const gchar *filename)
{
	const gchar *extension;

	extension = strrchr(filename, '.');
	if (extension) {
		return extension;
	} else {
		return filename + strlen(filename);
	}
}

static gboolean
extension_is_html(const gchar *extension)
{
	return
		extension[0] == '.' &&
		extension[1] == 'h' &&
		extension[2] == 't' &&
		extension[3] == 'm' &&
		(extension[4] == '\0' ||
			(extension[4] == 'l' &&
				extension[5] == '\0'));
}

static gboolean
extension_is_mhtml(const gchar *extension)
{
	return
		extension[0] == '.' &&
		extension[1] == 'm' &&
		extension[2] == 'h' &&
		extension[3] == 't' &&
		(extension[4] == '\0' ||
			(extension[4] == 'm' &&
				(extension[5] == '\0' ||
					(extension[5] == 'l' &&
						extension[6] == '\0'))));
}

static void
save_html(MqWebView *web_view, GFile *file)
{
	web_view->save_file = file;
	webkit_web_resource_get_data(
		webkit_web_view_get_main_resource(WEBKIT_WEB_VIEW(web_view)),
		NULL, (GAsyncReadyCallback) save_html_get_data_cb, web_view);
}

static void
save_mhtml(MqWebView *web_view, GFile *file)
{
	webkit_web_view_save_to_file(WEBKIT_WEB_VIEW(web_view), file,
		WEBKIT_SAVE_MODE_MHTML, NULL,
		(GAsyncReadyCallback) save_mhtml_cb, NULL);
}

static gchar *
get_clean_title(MqWebView *web_view)
{
	const gchar *title;

	title = webkit_web_view_get_title(WEBKIT_WEB_VIEW(web_view));
	if (!title || title[0] == '\0') {
		title = web_view->uri;
	}
	if (!title || title[0] == '\0') {
		title = "page";
	}
	return g_strdelimit(g_strdup(title),
#ifdef G_OS_WIN32
		"/\\:*\"?<>|",
#else
		"/",
#endif
		'_');
}

static void
save_type_changed_cb(GtkComboBox *combo_box, GtkFileChooser *chooser)
{
	gchar       *name;
	gchar       *extension;
	const gchar *active_id;
	gchar       *new_name;

	name = gtk_file_chooser_get_current_name(chooser);
	extension = get_extension(name);

	active_id = gtk_combo_box_get_active_id(combo_box);
	if (g_strcmp0(active_id, "html") == 0) {
		if (!extension_is_html(extension)) {
			/* Extension is not "htm" or "html". */
			extension[0] = '\0';  /* Remove extension. */
			new_name = g_strconcat(name, ".html", NULL);
			gtk_file_chooser_set_current_name(chooser, new_name);
			g_free(new_name);
		}
	} else if (g_strcmp0(active_id, "mhtml") == 0) {
		if (!extension_is_mhtml(extension)) {
			/* Extension is not "mht", "mhtm", or "mhtml". */
			extension[0] = '\0';  /* Remove extension. */
			new_name = g_strconcat(name, ".mhtml", NULL);
			gtk_file_chooser_set_current_name(chooser, new_name);
			g_free(new_name);
		}
	}

	g_free(name);
}

static void
save_response_cb(GtkWidget *dialog, gint response_id, MqWebView *web_view)
{
	gchar       *dir;
	gchar       *filename;
	GFile       *file;
	gchar       *extension;
	const gchar *active_id;

	if (response_id == GTK_RESPONSE_ACCEPT) {
		dir = gtk_file_chooser_get_current_folder(
			GTK_FILE_CHOOSER(dialog));
		if (dir) {
			mq_config_set_string(web_view->config,
				"directories.downloads", dir);
			g_free(dir);
			mq_config_save(web_view->config);
		}

		filename = gtk_file_chooser_get_filename(
			GTK_FILE_CHOOSER(dialog));
		file = g_file_new_for_path(filename);

		active_id = gtk_combo_box_get_active_id(
			web_view->save_type_combo_box);
		if (g_strcmp0(active_id, "detect") == 0) {
			extension = get_extension(filename);
			if (extension_is_html(extension)) {
				save_html(web_view, file);
			} else {
				save_mhtml(web_view, file);
			}
		} else if (g_strcmp0(active_id, "html") == 0) {
			save_html(web_view, file);
		} else if (g_strcmp0(active_id, "mhtml") == 0) {
			save_mhtml(web_view, file);
		}

		g_free(filename);
	}

	gtk_widget_destroy(dialog);
}

void
mq_web_view_save(MqWebView *web_view)
{
	GtkWidget      *dialog;
	GtkFileChooser *chooser;
	gchar          *dir;
	gchar          *title;
	gchar          *filename;
	GtkWidget      *type_combo_box;
	GtkWidget      *type_box;

	dialog = gtk_file_chooser_dialog_new("Save File",
		GTK_WINDOW(mq_tab_page_get_window(web_view->tab_page)),
		GTK_FILE_CHOOSER_ACTION_SAVE,
		"_Cancel", GTK_RESPONSE_CANCEL,
		"_Save",   GTK_RESPONSE_ACCEPT,
		NULL);
	chooser = GTK_FILE_CHOOSER(dialog);

	gtk_file_chooser_set_do_overwrite_confirmation(chooser, TRUE);

	dir = mq_config_get_string(web_view->config, "directories.downloads");
	gtk_file_chooser_set_current_folder(chooser, dir);
	g_free(dir);

	title = get_clean_title(web_view);
	filename = g_strconcat(title, ".mhtml", NULL);
	g_free(title);
	gtk_file_chooser_set_current_name(chooser, filename);
	g_free(filename);

	add_chooser_filters(chooser);

	type_combo_box = gtk_combo_box_text_new();
	gtk_combo_box_text_append(GTK_COMBO_BOX_TEXT(type_combo_box),
		"detect", "By extension");
	gtk_combo_box_text_append(GTK_COMBO_BOX_TEXT(type_combo_box),
		"html", "HTML document only");
	gtk_combo_box_text_append(GTK_COMBO_BOX_TEXT(type_combo_box),
		"mhtml", "MHTML archive with associated resources");
	gtk_combo_box_set_active(GTK_COMBO_BOX(type_combo_box), 0);
	g_signal_connect(type_combo_box, "changed",
		G_CALLBACK(save_type_changed_cb), chooser);
	web_view->save_type_combo_box = GTK_COMBO_BOX(type_combo_box);

	type_box = gtk_box_new(GTK_ORIENTATION_HORIZONTAL, 0);
	gtk_box_pack_start(GTK_BOX(type_box),
		gtk_label_new("Save as file type:"), FALSE, FALSE, 0);
	gtk_box_pack_start(GTK_BOX(type_box), type_combo_box, FALSE, FALSE, 0);
	gtk_file_chooser_set_extra_widget(chooser, type_box);

	g_signal_connect(dialog, "response",
		G_CALLBACK(save_response_cb), web_view);
	gtk_widget_show_all(dialog);
}