"use strict";

var File = require("./file");
var Vocabulary = require("../../wType/vocabulary");
var Uint64 = require("../../wType/uint64");

var Audio = File.inherit({
    className: "Audio",
    constructor: function Audio(addr) {
        File.fn.constructor.call(this, addr);
        
        this._loadedFrames = 0;
        this._totalFrames = 0;
        this._waitingForFrames = false;
        this._portions = [];
        
        this.addHandler("responseFrames");
    },
    hasMore: function() {
        return this._totalFrames > this._loadedFrames;
    },
    _getAdditional: function(add) {
        var ac = File.fn._getAdditional.call(this, add);
        
        if (ac) {
            this._loadedFrames = 0;
            this._totalFrames = this._additional.at("framesAmount").valueOf();
            this._waitingForFrames = false;
        }
        
        this.initialized = true;
        return ac;
    },
    _h_responseFrames: function(ev) {
        if (this._waitingForFrames === true) {
            var data = ev.getData();
            
            var success = data.at("result").valueOf();
            if (success === 0) {
                var amount = data.at("amount").valueOf();
                var blob = data.at("data").clone();
                this._loadedFrames += amount;
                this._waitingForFrames = false;
                this._portions.push(blob);
                this.trigger("newFrames", blob);
            }
        }
    },
    requestMore: function() {
        if (!this._waitingForFrames) {
            if (this._registered && this._subscribed) {
                var allowed = this._totalFrames - this._loadedFrames;
                
                if (allowed > 0) {
                    var vc = new Vocabulary();
                    vc.insert("index", new Uint64(this._loadedFrames));
                    vc.insert("amount", new Uint64(Math.min(framePortion, allowed)));
                    
                    this.send(vc, "requestFrames");
                    this._waitingForFrames = true;
                }
            }
        }
    }
});

var framePortion = 10;

module.exports = Audio;