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/*
 * view-source: URI scheme
 *
 * 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 "view-source.h"

#include <string.h>

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

#include "../application.h"
#include "../utils/resources.h"
#include "../utils/string.h"

typedef struct {
	WebKitURISchemeRequest *request;
	gchar                  *uri;
	gulong                  handler_id;
} DataSignalData;

#define DOCUMENT \
	"<!doctype html>\n" \
	"<html dir=\"%s\">\n" \
		"<head>\n" \
			"<meta charset=\"utf-8\">\n" \
			"<title>Source of %s</title>\n" \
			"<link rel=\"stylesheet\" type=\"text/css\" " \
				"media=\"all\" " \
				"href=\"view-source:resources/prism/" \
				"prism.css\">\n" \
			"<script src=\"view-source:resources/prism/" \
				"prism.js\"></script>\n" \
		"</head>\n" \
		"<body style=\"margin: 0;\">\n" \
			"<pre style=\"overflow: visible; width: 100%%; " \
				"margin: 0;\">\n" \
				"<code class=\"language-markup line-numbers\" "\
					"style=\"overflow: visible;\">" \
					"%s</code>\n" \
			"</pre>\n" \
		"</body>\n" \
	"</html>\n"

static void
respond(WebKitURISchemeRequest *request, const gchar *uri, guchar *data,
	gsize length)
{
	gchar        *escaped_data;
	GInputStream *stream;

	escaped_data = g_markup_escape_text((gchar *) data, length);

	stream = g_memory_input_stream_new_from_data(
		g_strdup_printf(DOCUMENT,
			gtk_widget_get_default_direction() ==
				GTK_TEXT_DIR_RTL ? "rtl" : "ltr",
			uri, escaped_data), -1, g_free);

	webkit_uri_scheme_request_finish(request, stream, -1, "text/html");
	g_object_unref(stream);
}

static void
data_cb(MqWebView *web_view, GParamSpec G_GNUC_UNUSED *param_spec,
	DataSignalData *data_signal_data)
{
	guchar *data;
	gsize   length;

	data = mq_web_view_get_data(web_view, &length);
	respond(data_signal_data->request, data_signal_data->uri, data, length);
	g_signal_handler_disconnect(web_view, data_signal_data->handler_id);
	g_free(data_signal_data->uri);
	g_free(data_signal_data);
}

void
mq_view_source_request(WebKitURISchemeRequest *request,
	MqApplication *application)
{
	const gchar    *path;
	gchar          *query_str;
	GHashTable     *query;
	gint64          origin_tab_id;
	gchar          *uri;
	MqTabPage      *origin_tab;
	MqWebView      *origin_web_view;
	guchar         *data;
	gsize           length;
	DataSignalData *data_signal_data;

	path = webkit_uri_scheme_request_get_path(request);

	if (g_str_has_prefix(path, "resources/")) {
		mq_resource_response(application, path + sizeof("resources"),
			request);
		return;
	}

	query_str = g_strdup(path);
	query = mq_parse_query_string(query_str);

	/* TODO: Handle missing tab ID ("origin-tab=0"). */
	origin_tab_id = mq_atoi64(g_hash_table_lookup(query, "origin-tab"));
	uri = g_strdup(g_hash_table_lookup(query, "uri"));

	g_hash_table_unref(query);
	g_free(query_str);

	origin_tab = mq_application_get_tab(application, origin_tab_id);

	if (origin_tab) {
		origin_web_view = mq_tab_page_get_web_view(origin_tab);

		data = mq_web_view_get_data(origin_web_view, &length);
		if (data) {
			respond(request, uri, data, length);
		} else {
			data_signal_data = g_new(DataSignalData, 1);
			data_signal_data->request = request;
			data_signal_data->uri = uri;
			data_signal_data->handler_id = g_signal_connect(
				origin_web_view, "notify::data",
				G_CALLBACK(data_cb), data_signal_data);
		}
	} else {
		/* TODO: Handling reloads by newly requesting the resource
		 * should obviate this. */
		respond(request, uri,
			(guchar *) g_strdup("Viewed tab no longer open"), -1);
	}
}