radio/libjs/wController/player.js

"use strict";

var Uint64 = require("../wType/uint64");
var Address = require("../wType/address");

var Controller = require("./controller");
var Button = require("./button");
var ImageById = require("./imageById");
var Vocabulary = require("./vocabulary");
var Enum = require("../utils/enum");

var Player = Controller.inherit({
    className: "Player",
    constructor: function(addr) {
        Controller.fn.constructor.call(this, addr);
        
        this.controls = Object.create(null);
        this.views = Object.create(null);
        this.mode = PlayerMode.straight.playback;
        
        this.addHandler("get");
        this.addHandler("viewsChange");
    },
    _addControl: function(type, address) {
        var t = type.valueOf();
        
        if (this.controls[t] !== undefined) {
            throw new Error("An attempt to add multiple instances of " + ItemType.reversed[t] + " into Player");
        }
        
        if (ItemType.reversed[t] !== undefined) {
            switch (t) {
                case ItemType.straight.playPause:
                    var btn = new Button(address.clone());
                    btn.itemType = t;
                    this.controls[t] = btn;
                    this.addController(btn);
                    this.trigger("newElement", btn, t);
                    break;
                default:
                    this.trigger("serviceMessage", "An attempt to add ItemType " + ItemType.reversed[t] + " to controls of the Player, but it's not qualified to be a control");
            }
        } else {
            this.trigger("serviceMessage", "An unrecgnized item ItemType in Player: " + t);
        }
    },
    _addView: function(type, address) {
        var t = type.valueOf();
        var ctrl;
        var supported = false;
        
        if (this.views[t] !== undefined) {
            throw new Error("An attempt to add multiple instances of " + ItemType.reversed[t] + " into Player");
        }
        
        if (ItemType.reversed[t] !== undefined) {
            switch (t) {
                case ItemType.straight.queue:
                    this.trigger("serviceMessage", "Queue is not supported yet in Player");
                    break;
                case ItemType.straight.currentPlayback:
                    ctrl = new Vocabulary(address.clone());
                    ctrl.on("newElement", this._onNewPlayBackElement, this);
                    ctrl.on("removeElement", this._onNewRemoveBackElement, this);
                    supported = true;
                    break;
                case ItemType.straight.picture:
                    ctrl = new ImageById(null, address.back());
                    ctrl.ItemType = t;
                    this.views[t] = ctrl;
                    
                    this.trigger("newElement", ctrl, t);
                    supported = false;                  //just to avoid adding with addController, since ImageById is not a controller
                    break;
                default:
                    this.trigger("serviceMessage", "An attempt to add ItemType " + ItemType.reversed[t] + " to views of the Player, but it's not qualified to be a view");
            }
        } else {
            this.trigger("serviceMessage", "An unrecgnized item ItemType in Player: " + t);
        }
        
        if (supported) {
            ctrl.ItemType = t;
            this.views[t] = ctrl;
            this.addController(ctrl);
            
            this.trigger("newElement", ctrl, t);
        }
    },
    _h_get: function(ev) {
        var data = ev.getData();
        
        var controls = data.at("controls");
        var views = data.at("views");
        var mode = data.at("mode").valueOf();
        var size, i, vc;
        
        size = controls.length();
        for (i = 0; i < size; ++i) {
            vc = controls.at(i);
            this._addControl(vc.at("type"), vc.at("address"));
        }
        
        size = views.length();
        for (i = 0; i < size; ++i) {
            vc = views.at(i);
            this._addView(vc.at("type"), vc.at("address"));
        }
        
        if (this.mode !== mode) {
            if (PlayerMode.reversed[mode] === undefined) {
                throw new Error("Unsupported mode of player: " + mode);
            }
            this.mode = mode;
        }
        
        this.initialized = true;
        this.trigger("data");
    },
    _h_viewsChange: function(ev) {
        var data = ev.getData();
        
        var add = data.at("add");
        var remove = data.at("remove");
        var size, i, vc;
        
        size = remove.length();
        for (i = 0; i < size; ++i) {
            this._removeView(remove.at(i));
        }
        
        size = add.length();
        for (i = 0; i < size; ++i) {
            vc = add.at(i);
            this._addView(vc.at("type"), vc.at("address"));
        }
    },
    _onNewPlayBackElement: function(key, element) {
        switch (key) {
            case "image":
                var address = new Address(["images", element.toString()]);
                this._addView(new Uint64(ItemType.straight.picture), address);
                address.destructor();
                break;
        }
    },
    _onNewRemoveBackElement: function(key) {
        switch (key) {
            case "image":
                this._removeView(new Uint64(ItemType.straight.picture));
                break;
        }
    },
    _removeControl: function(type) {
        //TODO
    },
    _removeView: function(type) {
        //TODO
    }
});

var ItemType = new Enum("ItemType");
ItemType.add("playPause");
ItemType.add("currentPlayback");
ItemType.add("queue");
ItemType.add("picture");

var PlayerMode = new Enum("PlayerMode");
PlayerMode.add("playback");

Player.ItemType = ItemType;

module.exports = Player;