// CookieJar - A contestant's algorithm toolbox
// Copyright 2014 Peter Szilagyi. All rights reserved.
//
// CookieJar is dual licensed: use of this source code is governed by a BSD
// license that can be found in the LICENSE file. Alternatively, the CookieJar
// toolbox may be used in accordance with the terms and conditions contained
// in a signed written agreement between you and the author(s).

package main

import (
	"flag"
	"fmt"
	"os"

	"gopkg.in/inconshreveable/log15.v2"
	"gopkg.in/qml.v1"
	"gopkg.in/qml.v1/webengine"
)

// Arena QML to not require additional files
const arenaQml = `
import QtQuick 2.1
import QtWebEngine 1.0
import QtQuick.Controls 1.0

ApplicationWindow {
	title: "CodinGame Karalabe Arena"
    width: 1024
    height: 768
    
    WebEngineView {
    	objectName: "arena"
        anchors.fill: parent
        url: "http://www.codingame.com"
    }
}
`

// Command line flags for the arena
var repo = flag.String("repo", "challenges", "Challenge repository to work with")

// Application entry point, simple starts the arena QML app.
func main() {
	flag.Parse()
	if err := qml.Run(arena); err != nil {
		log15.Crit("failed to start arena", "error", err)
		os.Exit(-1)
	}
}

// QML application entry point to assemble the arena.
func arena() error {
	// Initialize the Chromium WebEngine
	webengine.Initialize()

	// Initialize the WebSocket backend
	port, err := backend()
	if err != nil {
		return err
	}
	// Create a new QML engine and terminate on quit
	engine := qml.NewEngine()
	engine.On("quit", func() { os.Exit(0) })

	// Load the main arena content from QML
	view, err := engine.LoadString("codingame.qml", arenaQml)
	if err != nil {
		return err
	}
	win := view.CreateWindow(nil)

	// Create the controller around the arena
	ctrl := &Control{
		arena:   win.Root().ObjectByName("arena"),
		backend: port,
	}
	ctrl.arena.On("loadingChanged", ctrl.InjectControl)

	// Start the application and wait till closure
	win.Call("showMaximized")
	win.Wait()
	return nil
}

// Arena controller to handle events.
type Control struct {
	arena   qml.Object
	backend int
}

// Invoked whenever a page is navigated.
func (c *Control) InjectControl(request qml.Object) {
	// Make sure the page loaded correctly
	if request.Int("status") != 2 {
		return
	}
	// Try and indefinitely find an editor, and fetch its contents into the title
	ctrlJs := `
		// Dial back to the arena backend
		var ws = new WebSocket("ws://localhost:` + fmt.Sprint(c.backend) + `");
		ws.onmessage = function(msg) {
			var packet = JSON.parse(msg.data);

			// Check for system notifications
			if (packet.message != undefined) {
				noty({
					layout: 'top',
					type: packet.type,
					text: packet.message,
					dismissQueue: true, 
					animation: {
						open: {height: 'toggle'},
						close: {height: 'toggle'},
						easing: 'swing',
						speed: 500 
						},
					timeout: 3000
				});   
				return;
			}

			// Code update arrived, fetch enditor and ensure correct challenge
			var editor = document.getElementById('ideFrame').contentWindow.ace.edit('ace_edit');
			if (editor != undefined) {
				var title = document.getElementById('ideFrame').contentDocument.getElementsByClassName('challengeTitle')[0].firstChild;
				if (title.nodeValue.trim() == packet.name) {
					editor.setValue(packet.source, 0);
					editor.navigateFileStart();
				}
			}
		};

		// Keep checking for editor presence
		setInterval(function() {
			var editor = document.getElementById('ideFrame').contentWindow.ace.edit('ace_edit');
			if (editor != undefined) {
				// Assemble a source report and send it to the backend
				var title = document.getElementById('ideFrame').contentDocument.getElementsByClassName('challengeTitle')[0].firstChild;
				var challenge = {
					'name':   title.nodeValue.trim(),
					'source': editor.getValue()
				};
				ws.send(JSON.stringify(challenge));
			}
		}, 1000);
	`

	log15.Info("injecting frontend javascript")
	c.arena.Call("runJavaScript", notifyJs)
	c.arena.Call("runJavaScript", ctrlJs)
}