var Class = require('../utils/Class');
var PluginManager = require('../plugins/PluginManager');

//  A proxy class to the Global Scene Manager
var ScenePlugin = new Class({

    initialize:

    function ScenePlugin (scene)
    {
        //  The Scene that owns this plugin
        this.scene = scene;

        this.systems = scene.sys;

        this.systems.events.on('boot', this.boot, this);

        this.settings = scene.sys.settings;

        this.key = scene.sys.settings.key;

        //  SceneManager
        this.manager = scene.sys.game.scene;

        //  Private
        this._queue = [];
    },

    boot: function ()
    {
        this.systems.events.on('preupdate', this.preUpdate, this);
        this.systems.events.on('shutdown', this.shutdown, this);
        this.systems.events.on('destroy', this.destroy, this);
    },

    preUpdate: function ()
    {
        var len = this._queue.length;

        if (len === 0)
        {
            return;
        }

        var manager = this.manager;

        //  Process the queue
        for (var i = 0; i < len; i++)
        {
            var action = this._queue[i];

            switch (action.type)
            {
                case 'add':
                    manager.add(action.key, action.data, action.autoStart);
                    break;

                case 'start':
                    manager.stop(this.key);
                    manager.start(action.key, action.data);
                    break;

                case 'launch':
                    manager.start(action.key, action.data);
                    break;

                case 'pause':
                    manager.pause(action.key);
                    break;

                case 'resume':
                    manager.resume(action.key);
                    break;

                case 'stop':
                    manager.stop(action.key);
                    break;

                case 'swap':
                    manager.swap(this.key, action.key);
                    break;

                case 'moveUp':
                    manager.moveUp(this.key);
                    break;

                case 'moveDown':
                    manager.moveDown(this.key);
                    break;

                case 'bringToTop':
                    manager.bringToTop(this.key);
                    break;

                case 'sendToBack':
                    manager.sendToBack(this.key);
                    break;

                case 'swapPosition':
                    manager.swapPosition(this.key, action.key);
                    break;

                case 'sleep':
                    manager.sleep(action.key);
                    break;

                case 'wake':
                    manager.wake(action.key);
                    break;
            }
        }

        this._queue.length = 0;
    },

    //  Shutdown this Scene and run the given one
    start: function (key, data)
    {
        if (key === undefined) { key = this.key; }

        this._queue.push({ type: 'start', key: key, data: data });

        return this;
    },

    //  Add the Scene into the Scene Manager and start it if 'autoStart' is true or the Scene config 'active' property is set
    add: function (key, sceneConfig, autoStart)
    {
        this._queue.push({ type: 'add', key: key, data: sceneConfig, autoStart: autoStart });

        return this;
    },

    //  Launch the given Scene and run it in parallel with this one
    launch: function (key, data)
    {
        if (key === undefined) { key = this.key; }

        this._queue.push({ type: 'launch', key: key, data: data });

        return this;
    },

    //  Pause the Scene - this stops the update step from happening but it still renders
    pause: function (key)
    {
        if (key === undefined) { key = this.key; }

        this._queue.push({ type: 'pause', key: key });

        return this;
    },

    //  Resume the Scene - starts the update loop again
    resume: function (key)
    {
        if (key === undefined) { key = this.key; }

        this._queue.push({ type: 'resume', key: key });

        return this;
    },

    //  Makes the Scene sleep (no update, no render) but doesn't shutdown
    sleep: function (key)
    {
        this._queue.push({ type: 'sleep', key: key });

        return this;
    },

    //  Makes the Scene wake-up (starts update and render)
    wake: function (key)
    {
        this._queue.push({ type: 'wake', key: key });

        return this;
    },

    //  Makes this Scene sleep then starts the Scene given
    swap: function (key)
    {
        this._queue.push({ type: 'swap', key: key });

        return this;
    },

    //  Shutdown the Scene, clearing display list, timers, etc
    stop: function (key)
    {
        if (key === undefined) { key = this.key; }

        this._queue.push({ type: 'stop', key: key });

        return this;
    },

    setVisible: function (value)
    {
        this.settings.visible = value;

        return this;
    },

    swapPosition: function (key)
    {
        this._queue.push({ type: 'swapPosition', key: key });
    },

    moveUp: function ()
    {
        this._queue.push({ type: 'moveUp' });
    },

    moveDown: function ()
    {
        this._queue.push({ type: 'moveDown' });
    },

    bringToTop: function ()
    {
        this._queue.push({ type: 'bringToTop' });
    },

    sendToBack: function ()
    {
        this._queue.push({ type: 'sendToBack' });
    },

    get: function (key)
    {
        return this.manager.getScene(key);
    },

    transitionTo: function (key, duration)
    {
    },

    isActive: function (key)
    {
        if (key === undefined) { key = this.key; }

        return this.manager.isActive(key);
    },

    shutdown: function ()
    {
        //  TODO
    },

    destroy: function ()
    {
        //  TODO
    }

});

PluginManager.register('ScenePlugin', ScenePlugin, 'scenePlugin');

module.exports = ScenePlugin;