/*
 * Tab chrome
 *
 * 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 <stdlib.h>
#include <string.h>

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

#include "tab-chrome.h"
#include "tab.h"

static void
back_clicked_cb(GtkButton __attribute__((unused)) *toolbutton,
	MqTabChrome *chrome)
{
	webkit_web_view_go_back(chrome->web_view);
}

static void
forward_clicked_cb(GtkButton __attribute__((unused)) *toolbutton,
	MqTabChrome *chrome)
{
	webkit_web_view_go_forward(chrome->web_view);
}

static GtkWidget *
back_forward_list_item_new(WebKitBackForwardListItem *list_item,
	gint type)
{
	GtkWidget *label;
	GtkWidget *icon_stack;
	GtkWidget *icon;
	GtkWidget *box;

	label = gtk_label_new(webkit_back_forward_list_item_get_title(
			list_item));
	gtk_widget_set_halign(label, GTK_ALIGN_START);

	icon_stack = gtk_stack_new();
	switch (type) {
		case 0:
			icon = gtk_radio_button_new(NULL);
			gtk_stack_add_named(GTK_STACK(icon_stack), icon,
				"current");
			gtk_widget_set_can_focus(icon, FALSE);
			gtk_stack_add_named(GTK_STACK(icon_stack),
				gtk_image_new_from_icon_name("go-previous",
					GTK_ICON_SIZE_BUTTON), "back");
			break;
		case -1:
			gtk_stack_add_named(GTK_STACK(icon_stack),
				gtk_image_new_from_icon_name("go-previous",
					GTK_ICON_SIZE_BUTTON), "back");
			gtk_stack_add_named(GTK_STACK(icon_stack),
				gtk_radio_button_new(NULL), "current");
			break;
		case 1:
			gtk_stack_add_named(GTK_STACK(icon_stack),
				gtk_image_new_from_icon_name("go-next",
					GTK_ICON_SIZE_BUTTON), "forward");
			gtk_stack_add_named(GTK_STACK(icon_stack),
				gtk_radio_button_new(NULL), "current");
			break;
	}

	box = gtk_box_new(GTK_ORIENTATION_HORIZONTAL, 0);
	gtk_box_pack_start(GTK_BOX(box), icon_stack, FALSE, FALSE, 0);
	gtk_box_pack_start(GTK_BOX(box), label, TRUE, TRUE, 0);
	gtk_widget_set_tooltip_text(box,
		webkit_back_forward_list_item_get_uri(list_item));

	return box;
}

static void
back_forward_list_box_row_activated_cb(GtkListBox __attribute__((unused)) *box,
	GtkListBoxRow *row, MqTabChrome *chrome)
{
	webkit_web_view_go_to_back_forward_list_item(chrome->web_view,
		webkit_back_forward_list_get_nth_item(
			webkit_web_view_get_back_forward_list(chrome->web_view),
			gtk_list_box_row_get_index(row) - chrome->back_items));

	gtk_widget_hide(chrome->back_forward_popover);
}

static void
back_forward_toggle_button_toggled_cb(GtkToggleButton *toggle_button,
	GtkStack *stack)
{
	/* Use gtk_widget_show() and gtk_widget_hide() instead of
	 * gtk_stack_set_visible_child() so that the stack fits the size of only
	 * the visible child. */
	gtk_widget_show_all(gtk_stack_get_child_by_name(stack,
			gtk_toggle_button_get_active(toggle_button) ?
				"text" : "list"));
	gtk_widget_hide(gtk_stack_get_child_by_name(stack,
			gtk_toggle_button_get_active(toggle_button) ?
				"list" : "text"));
}

static gboolean
back_forward_box_button_press_cb(GtkWidget *widget, GdkEvent *event,
	MqTabChrome *chrome)
{
	WebKitBackForwardList *back_forward_list;
	GtkWidget             *list_box;
	GtkWidget             *text_view;
	GtkTextBuffer         *text_buffer;
	GList                 *list_item;
	GtkTextIter            text_iter;
	gchar                 *str;
	GtkTextTag            *text_tag;
	GtkWidget             *list_scrolled_window;
	GtkWidget             *text_scrolled_window;
	GtkWidget             *stack;
	GtkWidget             *toggle_button;
	GtkWidget             *box;

	/* Make sure this is a mouse button press event.  Either the middle or
	 * right button is OK. */
	if (event->type != GDK_BUTTON_PRESS) {
		return FALSE;
	}

	/* Get the back/forward list for the Web view. */
	back_forward_list = webkit_web_view_get_back_forward_list(
		chrome->web_view);

	/* Set up the list box. */
	list_box = gtk_list_box_new();
	gtk_list_box_set_selection_mode(GTK_LIST_BOX(list_box),
		GTK_SELECTION_BROWSE);
	gtk_list_box_set_activate_on_single_click(GTK_LIST_BOX(list_box), TRUE);
	g_signal_connect(list_box, "row-activated",
		G_CALLBACK(back_forward_list_box_row_activated_cb), chrome);

	/* Set up the text view. */
	text_view = gtk_text_view_new();
	text_buffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(text_view));
	gtk_text_view_set_editable(GTK_TEXT_VIEW(text_view), FALSE);

	/* Insert forward list items. */
	/* The forward list is backwards, so we need to prepend each item to our
	 * list box and text buffer. */
	list_item = webkit_back_forward_list_get_forward_list(
		back_forward_list);
	for (; list_item; list_item = list_item->next) {
		gtk_list_box_prepend(GTK_LIST_BOX(list_box),
			back_forward_list_item_new(list_item->data, 1));
		gtk_text_buffer_get_start_iter(text_buffer, &text_iter);
		str = g_strdup_printf("\n%s",
			webkit_back_forward_list_item_get_uri(list_item->data));
		gtk_text_buffer_insert(text_buffer, &text_iter, str, -1);
		g_free(str);
	}

	/* Insert the current item. */
	gtk_list_box_prepend(GTK_LIST_BOX(list_box), back_forward_list_item_new(
			webkit_back_forward_list_get_current_item(
				back_forward_list), 0));
	gtk_list_box_select_row(GTK_LIST_BOX(list_box),
		gtk_list_box_get_row_at_index(GTK_LIST_BOX(list_box), 0));
	gtk_text_buffer_get_start_iter(text_buffer, &text_iter);
	text_tag = gtk_text_buffer_create_tag(text_buffer, NULL, "weight",
		PANGO_WEIGHT_BOLD, NULL);
	gtk_text_buffer_insert_with_tags(text_buffer, &text_iter,
		webkit_back_forward_list_item_get_uri(
			webkit_back_forward_list_get_current_item(
				back_forward_list)), -1, text_tag, NULL);

	/* Insert back list items. */
	list_item = webkit_back_forward_list_get_back_list(
		back_forward_list);
	chrome->back_items = 0;
	for (; list_item; list_item = list_item->next) {
		gtk_list_box_prepend(GTK_LIST_BOX(list_box),
			back_forward_list_item_new(list_item->data, -1));
		gtk_text_buffer_get_start_iter(text_buffer, &text_iter);
		str = g_strdup_printf("%s\n",
			webkit_back_forward_list_item_get_uri(list_item->data));
		gtk_text_buffer_insert(text_buffer, &text_iter, str, -1);
		g_free(str);
		++chrome->back_items;
	}

	/*
	 * The following GtkScrolledWindow widgets have hardcoded minimum sizes,
	 * because there seems to be (in GTK+ versions before 3.22) no way to
	 * set the natural size of GtkScrolledWindow and its GtkViewport.
	 *
	 * I tried:
	 *
	 *   - Setting size requests of the sizes of child widgets plus
	 *     scrollbars (commit 2205669)
	 *   - Putting GtkScrolledWindow widgets in stacks with non-scrolled
	 *     versions of children, to allocate more area for the
	 *     GtkScrolledWindow widgets to fill (commits 922cdef and 90686fa)
	 *   - Setting policies to disable scrollbars upon GtkScrolledWindow
	 *     instantiation, then enabling scrollbars on the GtkScrolledWindow
	 *     "size-allocate" signal (commits c534c7e and 42ca783)
	 *
	 * Attempts to match the size of a GtkScrolledWindow's GtkViewport to
	 * its child's size don't allow the GtkScrolledWindow and GtkViewport to
	 * shrink when necessary to fit within the window.  Therefore, such
	 * methods are equivalent to simply not using GtkScrolledWindow at all.
	 * And there appears to be no easy way to calculate the available size
	 * (the size of the GtkWindow minus all of the surrounding widgets) to
	 * manually manage a GtkViewport's size.
	 *
	 * GtkScrolledWindow or GtkViewport ignores the child's preferred
	 * (minimum and natural) sizes and apparently just sets a hardcoded size
	 * of about 64x64 px.  I considered subclassing GtkScrolledWindow or
	 * GtkViewport, but I'm not sure where the hardcoded size is set.
	 *
	 * The functions gtk_scrolled_window_set_propagate_natural_width() and
	 * gtk_scrolled_window_set_propagate_natural_height() were introduced in
	 * GTK+ 3.22 and probably do what I want.  However, I want to maintain
	 * compatibility with at least GTK+ 3.12 or 3.14.
	 */

	/* Set up the list scrolled window. */
	list_scrolled_window = gtk_scrolled_window_new(NULL, NULL);
	gtk_scrolled_window_set_min_content_width(
		GTK_SCROLLED_WINDOW(list_scrolled_window), 400);
	gtk_scrolled_window_set_min_content_height(
		GTK_SCROLLED_WINDOW(list_scrolled_window), 200);
	gtk_container_add(GTK_CONTAINER(list_scrolled_window), list_box);

	/* Set up the text scrolled window. */
	text_scrolled_window = gtk_scrolled_window_new(NULL, NULL);
	gtk_scrolled_window_set_min_content_width(
		GTK_SCROLLED_WINDOW(text_scrolled_window), 400);
	gtk_scrolled_window_set_min_content_height(
		GTK_SCROLLED_WINDOW(text_scrolled_window), 200);
	gtk_container_add(GTK_CONTAINER(text_scrolled_window), text_view);

	/* Set up the stack. */
	stack = gtk_stack_new();
	gtk_stack_add_named(GTK_STACK(stack), list_scrolled_window, "list");
	gtk_stack_add_named(GTK_STACK(stack), text_scrolled_window, "text");

	/* Set up the toggle button. */
	toggle_button = gtk_toggle_button_new();
	gtk_button_set_image(GTK_BUTTON(toggle_button),
		gtk_image_new_from_icon_name("edit-select-all",
			GTK_ICON_SIZE_SMALL_TOOLBAR));
	gtk_widget_set_halign(toggle_button, GTK_ALIGN_START);
	g_signal_connect(toggle_button, "toggled",
		G_CALLBACK(back_forward_toggle_button_toggled_cb),
		GTK_STACK(stack));

	/* Set up the containing box. */
	box = gtk_box_new(GTK_ORIENTATION_VERTICAL, 0);
	gtk_box_pack_start(GTK_BOX(box), toggle_button, TRUE, FALSE, 0);
	gtk_box_pack_start(GTK_BOX(box), stack, TRUE, FALSE, 0);

	/* Set up the popover. */
	chrome->back_forward_popover = gtk_popover_new(widget);
	gtk_container_add(GTK_CONTAINER(chrome->back_forward_popover), box);

	/* NB: gtk_popover_popup() is new in GTK+ 3.22. */
	gtk_widget_show_all(chrome->back_forward_popover);
	gtk_widget_hide(text_view);

	return FALSE;
}

static void
stop_reload_clicked_cb(GtkToolButton __attribute__((unused)) *toolbutton,
	MqTabChrome *chrome)
{
	if (webkit_web_view_is_loading(chrome->web_view)) {
		webkit_web_view_stop_loading(chrome->web_view);
	} else {
		webkit_web_view_reload(chrome->web_view);
	}
}

static void
uri_activate_cb(GtkEntry *entry, MqTabChrome *chrome)
{
	const gchar *uri;
	gchar       *rw_uri;

	uri = gtk_entry_get_text(GTK_ENTRY(entry));

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

static void
zoom_out_clicked_cb(GtkButton __attribute__((unused)) *button,
	MqTabChrome *chrome)
{
	webkit_web_view_set_zoom_level(chrome->web_view,
		webkit_web_view_get_zoom_level(chrome->web_view) - 0.1);
}

static void
zoom_reset_clicked_cb(GtkButton __attribute__((unused)) *button,
	MqTabChrome *chrome)
{
	webkit_web_view_set_zoom_level(chrome->web_view, 1.0);
}

static void
zoom_in_clicked_cb(GtkButton __attribute__((unused)) *button,
	MqTabChrome *chrome)
{
	webkit_web_view_set_zoom_level(chrome->web_view,
		webkit_web_view_get_zoom_level(chrome->web_view) + 0.1);
}

static void
about_clicked_cb(GtkButton __attribute__((unused)) *button, MqTabChrome *chrome)
{
	mq_tab_new("about:", chrome->tab);
	gtk_widget_hide(chrome->menu_popover);
	/* TODO: Hack: */
	gtk_notebook_next_page(GTK_NOTEBOOK(chrome->tab->window->notebook));
}

static void
quit_clicked_cb(GtkButton __attribute__((unused)) *button,
	MqTabChrome __attribute__((unused)) *chrome)
{
	/* TODO: Make a function mq_application_quit() that shows a confirmation
	 * dialog. */
	gtk_main_quit();
}

#define BUTTON_ROWS 6
#define BUTTON_COLS 3
#define NEW_BUTTON(Y, X, ICON, TOOLTIP) \
	do { \
		buttons[Y * BUTTON_COLS + X] = gtk_button_new_from_icon_name(\
			ICON, GTK_ICON_SIZE_BUTTON); \
		gtk_widget_set_tooltip_text(buttons[Y * BUTTON_COLS + X], \
			TOOLTIP); \
		gtk_grid_attach(GTK_GRID(grid), buttons[Y * BUTTON_COLS + X], \
			X, Y, 1, 1); \
	} while (0)
#define CLICKED_CB(Y, X, CB) \
	g_signal_connect(buttons[Y * BUTTON_COLS + X], "clicked", \
		G_CALLBACK(CB), chrome)

static void
menu_button_clicked_cb(GtkToolButton *tool_button,
	MqTabChrome __attribute__((unused)) *chrome)
{
	GtkWidget *grid;
	GtkWidget *buttons[BUTTON_ROWS * BUTTON_COLS];

	/* Set up the grid. */
	grid = gtk_grid_new();

	NEW_BUTTON(0, 0, "zoom-out",               "Zoom out");
	NEW_BUTTON(0, 1, "zoom-original",          "Reset zoom");
	NEW_BUTTON(0, 2, "zoom-in",                "Zoom in");
	NEW_BUTTON(1, 0, "document-open",          "Open file");
	NEW_BUTTON(1, 1, "document-save-as",       "Save page");
	NEW_BUTTON(1, 2, "mail-message-new",       "E-mail link");
	NEW_BUTTON(2, 0, "edit-find",              "Find");
	NEW_BUTTON(2, 1, "document-print-preview", "Print preview");
	NEW_BUTTON(2, 2, "document-print",         "Print");
	NEW_BUTTON(3, 0, "bookmark-new",           "Bookmarks");
	NEW_BUTTON(3, 1, "document-open-recent",   "History");
	NEW_BUTTON(3, 2, "document-save",          "Downloads");
	NEW_BUTTON(4, 0, "view-fullscreen",        "Full screen");
	NEW_BUTTON(4, 1, "document-properties",    "Developer tools");
	NEW_BUTTON(4, 2, "system-run",             "Preferences");
	NEW_BUTTON(5, 0, "help-about",             "About Marquee");
	NEW_BUTTON(5, 2, "application-exit",       "Quit");

	CLICKED_CB(0, 0, zoom_out_clicked_cb);
	CLICKED_CB(0, 1, zoom_reset_clicked_cb);
	CLICKED_CB(0, 2, zoom_in_clicked_cb);
	CLICKED_CB(5, 0, about_clicked_cb);
	CLICKED_CB(5, 2, quit_clicked_cb);

	/* Set up the popover. */
	chrome->menu_popover = gtk_popover_new(GTK_WIDGET(tool_button));
	gtk_container_add(GTK_CONTAINER(chrome->menu_popover), grid);

	/* NB: gtk_popover_popup() is new in GTK+ 3.22. */
	gtk_widget_show_all(chrome->menu_popover);
}

#undef BUTTON_ROWS
#undef BUTTON_COLS
#undef NEW_BUTTON

static GtkWidget *
navigation_toolbar_new(MqTabChrome *chrome, const gchar *uri)
{
	GtkToolbar  *navigation_toolbar;
	GtkToolItem *back_forward_tool_item;
	GtkWidget   *back_forward_event_box;
	GtkToolItem *uri_tool_item;

	navigation_toolbar = GTK_TOOLBAR(gtk_toolbar_new());

	back_forward_tool_item = gtk_tool_item_new();
	chrome->back_forward_box = gtk_box_new(GTK_ORIENTATION_HORIZONTAL, 0);

	/* Back button */
	chrome->back_button = gtk_button_new_from_icon_name("go-previous",
		GTK_ICON_SIZE_SMALL_TOOLBAR);
	gtk_widget_set_tooltip_text(GTK_WIDGET(chrome->back_button),
		"Go back one page");
	g_signal_connect(chrome->back_button, "clicked",
		G_CALLBACK(back_clicked_cb), chrome);
	gtk_box_pack_start(GTK_BOX(chrome->back_forward_box),
		chrome->back_button, FALSE, FALSE, 0);

	/* Forward button */
	chrome->forward_button = gtk_button_new_from_icon_name("go-next",
		GTK_ICON_SIZE_SMALL_TOOLBAR);
	gtk_widget_set_tooltip_text(GTK_WIDGET(chrome->forward_button),
		"Go forward one page");
	g_signal_connect(chrome->forward_button, "clicked",
		G_CALLBACK(forward_clicked_cb), chrome);
	gtk_box_pack_start(GTK_BOX(chrome->back_forward_box),
		chrome->forward_button, FALSE, FALSE, 0);

	gtk_style_context_add_class(
		gtk_widget_get_style_context(chrome->back_forward_box),
		"linked");
	back_forward_event_box = gtk_event_box_new();
	g_signal_connect(back_forward_event_box, "button-press-event",
		G_CALLBACK(back_forward_box_button_press_cb), chrome);
	gtk_container_add(GTK_CONTAINER(back_forward_event_box),
		chrome->back_forward_box);
	gtk_container_add(GTK_CONTAINER(back_forward_tool_item),
		back_forward_event_box);
	gtk_toolbar_insert(navigation_toolbar, back_forward_tool_item, -1);

	/* Stop/reload button */
	chrome->stop_icon = gtk_image_new_from_icon_name("process-stop",
		GTK_ICON_SIZE_SMALL_TOOLBAR);
	g_object_ref_sink(chrome->stop_icon);
	chrome->reload_icon = gtk_image_new_from_icon_name("view-refresh",
		GTK_ICON_SIZE_SMALL_TOOLBAR);
	g_object_ref_sink(chrome->reload_icon);
	chrome->stop_reload_button = gtk_tool_button_new(chrome->stop_icon,
		"Stop");
	gtk_widget_set_tooltip_text(GTK_WIDGET(chrome->stop_reload_button),
		"Stop loading the current page");
	g_signal_connect(chrome->stop_reload_button, "clicked",
		G_CALLBACK(stop_reload_clicked_cb), chrome);
	gtk_toolbar_insert(navigation_toolbar, chrome->stop_reload_button, -1);

	/* URI bar */
	uri_tool_item = gtk_tool_item_new();
	chrome->uri_entry = gtk_entry_new();
	if (uri) {
		gtk_entry_set_text(GTK_ENTRY(chrome->uri_entry), uri);
	}
	gtk_entry_set_placeholder_text(GTK_ENTRY(chrome->uri_entry),
		"URI...");
	gtk_entry_set_icon_from_icon_name(GTK_ENTRY(chrome->uri_entry),
		GTK_ENTRY_ICON_PRIMARY, "text-x-generic");
	gtk_entry_set_progress_fraction(GTK_ENTRY(chrome->uri_entry), 0.0);
	g_signal_connect(chrome->uri_entry, "activate",
		G_CALLBACK(uri_activate_cb), chrome);
	gtk_container_add(GTK_CONTAINER(uri_tool_item),
		chrome->uri_entry);
	gtk_tool_item_set_expand(uri_tool_item, TRUE);
	gtk_toolbar_insert(navigation_toolbar, uri_tool_item, -1);

	/* URI bar hovered link style */
	chrome->hovered_link_style = pango_attr_list_new();
	pango_attr_list_insert(chrome->hovered_link_style,
		pango_attr_style_new(PANGO_STYLE_ITALIC));

	/* Menu button */
	chrome->menu_button = gtk_tool_button_new(
		gtk_image_new_from_icon_name("open-menu-symbolic",
			GTK_ICON_SIZE_SMALL_TOOLBAR), "Menu");
	gtk_widget_set_tooltip_text(GTK_WIDGET(chrome->menu_button),
		"Open menu");
	g_signal_connect(chrome->menu_button, "clicked",
		G_CALLBACK(menu_button_clicked_cb), chrome);
	gtk_toolbar_insert(navigation_toolbar, chrome->menu_button, -1);

	gtk_widget_set_hexpand(GTK_WIDGET(navigation_toolbar), TRUE);

	chrome->load_failed = FALSE;

	return GTK_WIDGET(navigation_toolbar);
}

MqTabChrome *
mq_tab_chrome_new(MqTab *tab, const gchar *uri)
{
	MqTabChrome *chrome;

	chrome = malloc(sizeof(*chrome));
	chrome->tab = tab;

	chrome->container = gtk_box_new(GTK_ORIENTATION_VERTICAL, 0);
	gtk_box_pack_start(GTK_BOX(chrome->container),
		navigation_toolbar_new(chrome, uri), FALSE, FALSE, 0);

	return chrome;
}

GtkWidget *
mq_tab_chrome_get_container(MqTabChrome *chrome)
{
	return chrome->container;
}

static gchar *
web_view_get_uri(WebKitWebView *web_view)
{
	const gchar *uri;
	gchar       *rw_uri;

	uri = webkit_web_view_get_uri(web_view);

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

	return rw_uri;
}

static void
load_changed_cb(WebKitWebView *web_view, WebKitLoadEvent load_event,
	MqTabChrome *chrome)
{
	gchar *uri;

	switch (load_event) {
		case WEBKIT_LOAD_STARTED:
		case WEBKIT_LOAD_REDIRECTED:
		case WEBKIT_LOAD_COMMITTED:
			uri = web_view_get_uri(web_view);
			gtk_entry_set_text(GTK_ENTRY(chrome->uri_entry), uri);
			g_free(uri);
			gtk_entry_set_attributes(GTK_ENTRY(chrome->uri_entry),
				NULL);
			break;
		case WEBKIT_LOAD_FINISHED:
			gtk_entry_set_progress_fraction(
				GTK_ENTRY(chrome->uri_entry), 0.0);
			break;
	}
}

static gboolean
load_failed_cb(WebKitWebView __attribute__((unused)) *web_view,
	WebKitLoadEvent __attribute__((unused)) load_event,
	gchar __attribute__((unused)) *failing_uri,
	GError __attribute__((unused)) *error, MqTabChrome *chrome)
{
	chrome->load_failed = TRUE;
	return FALSE;
}

/* TODO: <Esc> key in URI bar should reset to URI of current hovered link, if
 * any, even if different from chrome->hovered_link_uri. */
static void
mouse_target_changed_cb(WebKitWebView __attribute__((unused)) *web_view,
	WebKitHitTestResult *hit_test_result,
	guint __attribute__((unused)) modifiers,
	MqTabChrome *chrome)
{
	gchar *uri;

	uri = web_view_get_uri(web_view);
	if (webkit_hit_test_result_context_is_link(hit_test_result)) {
		if (gtk_widget_has_focus(chrome->uri_entry)) {
		} else if (chrome->hovered_link_uri &&
				g_strcmp0(gtk_entry_get_text(
					GTK_ENTRY(chrome->uri_entry)),
				chrome->hovered_link_uri) != 0) {
			/* The user has edited the hovered link URI in the URI
			 * bar. */
		} else if (g_strcmp0(gtk_entry_get_text(
					GTK_ENTRY(chrome->uri_entry)), uri) ==
				0) {
			g_free(chrome->hovered_link_uri);
			chrome->hovered_link_uri = g_strdup(
				webkit_hit_test_result_get_link_uri(
					hit_test_result));
			gtk_entry_set_text(GTK_ENTRY(chrome->uri_entry),
				chrome->hovered_link_uri);
			gtk_entry_set_attributes(GTK_ENTRY(chrome->uri_entry),
				chrome->hovered_link_style);
		} else if (gtk_entry_get_attributes(
					GTK_ENTRY(chrome->uri_entry)) ==
				chrome->hovered_link_style) {
			/* The URI bar's text differs from the Web view's URI
			 * because the mouse was already targeting a different
			 * link. */
			g_free(chrome->hovered_link_uri);
			chrome->hovered_link_uri = g_strdup(
				webkit_hit_test_result_get_link_uri(
					hit_test_result));
			gtk_entry_set_text(GTK_ENTRY(chrome->uri_entry),
				chrome->hovered_link_uri);
		}
	} else if (gtk_entry_get_attributes(GTK_ENTRY(chrome->uri_entry)) ==
				chrome->hovered_link_style) {
		if (gtk_widget_has_focus(chrome->uri_entry)) {
		} else if (g_strcmp0(gtk_entry_get_text(
						GTK_ENTRY(chrome->uri_entry)),
				chrome->hovered_link_uri) == 0) {
			/* The user hasn't edited the hovered link URI in the
			 * URI bar. */
			g_free(chrome->hovered_link_uri);
			chrome->hovered_link_uri = NULL;
			gtk_entry_set_text(GTK_ENTRY(chrome->uri_entry), uri);
			gtk_entry_set_attributes(GTK_ENTRY(chrome->uri_entry),
				NULL);
		}
	}

	g_free(uri);
}

static void
load_progress_cb(WebKitWebView *web_view,
	GParamSpec __attribute__((unused)) *paramspec, MqTabChrome *chrome)
{
	/*
	 * If loading fails, the WebKitWebView's "estimated-load-progress" is
	 * set to 1.0 after signals like "load-changed" and "load-failed" are
	 * emitted.  So the only way to avoid leaving behind a full progress bar
	 * after, for example, canceling a page load is to save a flag on a
	 * failed load and only update the progress bar if the flag is unset.
	 */
	if (chrome->load_failed) {
		chrome->load_failed = FALSE;
		return;
	}
	gtk_entry_set_progress_fraction(GTK_ENTRY(chrome->uri_entry),
		webkit_web_view_get_estimated_load_progress(web_view));
}

static void
uri_cb(WebKitWebView *web_view, GParamSpec __attribute__((unused)) *paramspec,
	MqTabChrome *chrome)
{
	gchar *uri;

	uri = web_view_get_uri(web_view);
	gtk_entry_set_text(GTK_ENTRY(chrome->uri_entry), uri);
	g_free(uri);
	gtk_entry_set_attributes(GTK_ENTRY(chrome->uri_entry), NULL);
}

static void
loading_cb(WebKitWebView *web_view,
	GParamSpec __attribute__((unused)) *paramspec, MqTabChrome *chrome)
{
	if (webkit_web_view_is_loading(web_view)) {
		gtk_tool_button_set_icon_widget(
			GTK_TOOL_BUTTON(chrome->stop_reload_button),
			chrome->stop_icon);
		gtk_tool_button_set_label(
			GTK_TOOL_BUTTON(chrome->stop_reload_button), "Stop");
		gtk_widget_set_tooltip_text(
			GTK_WIDGET(chrome->stop_reload_button),
			"Stop loading the current page");
	} else {
		gtk_tool_button_set_icon_widget(
			GTK_TOOL_BUTTON(chrome->stop_reload_button),
			chrome->reload_icon);
		gtk_tool_button_set_label(
			GTK_TOOL_BUTTON(chrome->stop_reload_button), "Reload");
		gtk_widget_set_tooltip_text(
			GTK_WIDGET(chrome->stop_reload_button),
			"Reload the current page");
	}
	gtk_widget_show_all(GTK_WIDGET(chrome->stop_reload_button));
}

static void
back_forward_list_changed_cb(
	WebKitBackForwardList __attribute__((unused)) *back_forward_list,
	WebKitBackForwardListItem __attribute__((unused)) *item_added,
	gpointer __attribute__((unused)) items_removed, MqTabChrome *chrome)
{
	gtk_widget_set_sensitive(GTK_WIDGET(chrome->back_button),
		webkit_web_view_can_go_back(chrome->web_view));
	gtk_widget_set_sensitive(GTK_WIDGET(chrome->forward_button),
		webkit_web_view_can_go_forward(chrome->web_view));
}

static void
connect_web_view(MqTabChrome *chrome)
{
	chrome->hovered_link_uri = NULL;

	g_signal_connect(chrome->web_view, "load-changed",
		G_CALLBACK(load_changed_cb), chrome);
	g_signal_connect(chrome->web_view, "load-failed",
		G_CALLBACK(load_failed_cb), chrome);
	g_signal_connect(chrome->web_view, "mouse-target-changed",
		G_CALLBACK(mouse_target_changed_cb), chrome);
	g_signal_connect(chrome->web_view, "notify::estimated-load-progress",
		G_CALLBACK(load_progress_cb), chrome);
	g_signal_connect(chrome->web_view, "notify::uri",
		G_CALLBACK(uri_cb), chrome);
	g_signal_connect(chrome->web_view, "notify::is-loading",
		G_CALLBACK(loading_cb), chrome);
	g_signal_connect(
		webkit_web_view_get_back_forward_list(chrome->web_view),
		"changed", G_CALLBACK(back_forward_list_changed_cb), chrome);
}

void
mq_tab_chrome_set_web_view(MqTabChrome *chrome, WebKitWebView *web_view)
{
	chrome->web_view = web_view;
	connect_web_view(chrome);
}