/**

* js/pianoroll.js

*

* pianoroll basic component

*

*/

//TODO: add delay to adjust the "zero". this could should be given as an option

//or if explicitely null automatically adjusted from the mean of difference

//between the note timestamp and the current timestamp.

'use strict';

var PIXI = require('pixi');

var randomColor = require('randomColor');

var _ = require('lodash');

var NTP_EPOCH_DELTA = 2208988800; //c.f. RFC 868

function PianoRoll(options) {

    var _this = this;

    this.container = new PIXI.DisplayObjectContainer();

    this.container.x = options.xInit;

    this.container.y = options.yInit;

    options.parentContainer.addChild(this.container);

    var orientation = options.orientation;

    var isHorizontal = (orientation !== 'vertical');

    this.linesDown = options.linesDown;

    this.height = options.height;

    this.pixelsPerSecond = options.pixelsPerSecond;

    this.width = options.width;

    this.noteColors = options.noteColors;

    this.colorsReg = options.colorsReg || {};

    this.lineColor = options.lineColor;

    this.lineInterval = options.lineInterval;

    this.offsetMusic = options.offsetMusic || false;

    this.noteHeight = options.noteHeight;

    this.noteDict = {};

    this.startTs = options.startTs || Date.now();

    this.dynamicRange = options.dynamicRange;

    this.initRange = options.range;

    this.range = options.range;

    var started = false;

    var isHidden = function(child) {

        // TODO: the origin point is an approximation. Should refine this

        var globalPos = child.toGlobal(new PIXI.Point(0,0));

        return ((globalPos.x + child.width) < 0) || ((globalPos.y + child.height) < 0) ;

    };

    //TODO: I do not like the "regColor" object. This should not be global, but local

    this.getColor = function(canal) {

        var color = this.colorsReg[canal];

        if(typeof(color) === 'undefined') {

            var colorsRegSize = Object.keys(this.colorsReg).length;

            if(colorsRegSize < this.noteColors.length) {

                color = this.colorsReg[canal] = this.noteColors[colorsRegSize];

            }

            else {

                color = this.colorsReg[canal] = parseInt(randomColor({ luminosity: 'light', hue: 'random', format:'hex'}).replace(/^#/, ''), 16);

            }

        }

        return color;

    };

    this.getNoteRect = function(note, x, y, color, alpha, width, height) {

        var graphics = new PIXI.Graphics();

        graphics.note = note;

        graphics.beginFill(color, alpha);

        graphics.drawRect(0, 0, width, height);

        graphics.endFill();

        graphics.x = x;

        graphics.y = y;

        graphics.width = width;

        graphics.height = height;

        return graphics;

    };

    this.addNoteRaw = function(data) {

        var note = data.content[3];

        var velocity = data.content[4];

        var channel = data.content[2];

        var sessionTs = data.content[1];

        if(velocity !== 0 && typeof(this.noteDict[channel]) !== 'undefined' && typeof(this.noteDict[channel][note] !== 'undefined')) {

            this.addNote(note, ts, sessionTs, 0, channel, 0);

        }

        this.addNote(note, ts, sessionTs, velocity, channel, 0);

    };

    this.addNote = function(note, startTime, sessionTs, velocity, channel, duration) {

        var ts = startTime;

        if(this.offsetMusic) {

            ts = this.startTs + sessionTs;

        }

        var noteDuration = duration;

        var noteVelocity = velocity;

        var graphics;

        if(!duration) {

            if(typeof this.noteDict[channel]==='undefined'){

                this.noteDict[channel] = {};

            }

            if(velocity===0) {

                if(typeof this.noteDict[channel][note] !== 'undefined') {

                    var noteDef = this.noteDict[channel][note];

                    delete this.noteDict[channel][note];

                    noteDuration = sessionTs - noteDef.sessionTs;

                    graphics = noteDef.graphics;

                    noteVelocity = noteDef.velocity;

                    ts = noteDef.ts;

                }

            }

            else {

                noteDuration = Math.abs(Date.now() - ts);

                this.noteDict[channel][note] = { ts: ts, velocity: velocity, sessionTs: sessionTs};

            }

        }

        if(!this.offsetMusic || velocity===0) {

            var width = noteDuration * this.pixelsPerSecond / 1000;

            if(!graphics) {

                var x = (ts-this.startTs) * this.pixelsPerSecond / 1000;

                if((x+width) <  (Math.abs(this.container.x) - this.width)) {

                    // not visible. do nothing

                    return;

                }

            	if (this.dynamicRange && (this.range.bottom > note || note > this.range.top)){

            		var newScale = {};

            		newScale['bottom'] = Math.min(note, this.range.bottom);

            		newScale['top'] = Math.max(note, this.range.top);

            		this.rescaleScene(newScale);

            	}

            	var y = Math.floor(((this.range.top-this.range.bottom)-(note-this.range.bottom)+0.5) * (this.noteHeight) - (this.noteHeight/2));

                var color = this.getColor(channel);

                var alpha = (noteVelocity / 128);

                graphics = this.getNoteRect(note, x, y, color, alpha, width, this.noteHeight);

                this.container.addChild(graphics);

            }

            else {

                graphics.width = width;

            }

            if(!duration && velocity) {

                this.noteDict[channel][note].graphics = graphics;

            }

        }

    };

    //rescale scene in case a note out of range is added or a note out of the range is removed

    this.rescaleScene = function(newScale){

    	var _this = this;

    	var childrenToUpdate = [];

    	var top = this.initRange.top;

    	var bottom = this.initRange.bottom;

    	_(_this.container.children).forEach(function(child) {

    		if (typeof(child) !== 'undefined' && child.note && !isHidden(child)){

    			top = Math.max(child.note, top);

    			bottom = Math.min(child.note, bottom);

    			return childrenToUpdate.push(child);

    		}

        });

    	if (newScale){

    		this.range = newScale;

    	}else{

    	}

    	this.noteHeight = this.height / (this.range.top - this.range.bottom + 1);

    	childrenToUpdate.forEach(function(child) {

			child.y = Math.floor(((_this.range.top-_this.range.bottom)-(child.note-_this.range.bottom)+0.5) * (_this.noteHeight) - (_this.noteHeight/2));

			child.height = _this.noteHeight;

        });

    };

    this.addLine = function(ts){

        if(typeof(ts) === 'undefined') {

            ts = new Date();

        }

        var x = -this.container.x;

        var y = this.linesDown ? this.height - 20 : 0;

        var graphics = new PIXI.Graphics()

            .beginFill(0xFFFF00)

            .lineStyle(1, this.lineColor)

            .moveTo(0, 0)

            .lineTo(0, 20)

            .endFill();

        graphics.x = x;

        graphics.y = y;

        this.container.addChild(graphics);

        // Add text

        //var totalSec = lineNb * this.lineInterval / 1000;

        var hours = ts.getHours();

        var minutes =ts.getMinutes();

        var seconds = ts.getSeconds();

        var timeStr = (hours < 10 ? '0' + hours : hours) + ':' + (minutes < 10 ? '0' + minutes : minutes) + ':' + (seconds  < 10 ? '0' + seconds : seconds);

        var fontObj = { font: '10pt Arial', fill: '#444444' };

        var t = new PIXI.Text(timeStr, fontObj);

        if(isHorizontal) {

            t.x = x + 2;

            t.y = this.linesDown ? this.height - 15 : 2;

        }

        else {

            t.rotation = -Math.PI/2;

            t.x = x ;

            t.y = this.linesDown ? this.height - 2 : t.width + 2;

        }

        this.container.addChild(t);

    };

    this.moveTo = function(diffTime){

        var oldX = this.container.x;

        this.container.x = Math.floor(diffTime*this.pixelsPerSecond);

        var deltaX = Math.abs(oldX-this.container.x);

        _.forOwn(this.noteDict, function(channelDict) {

            _.forOwn(channelDict, function(noteDef) {

                if(noteDef.graphics) {

                    noteDef.graphics.width = noteDef.graphics.width + deltaX;

                }

            });

        });

    };

    this.move = function() {

        var diff = (this.startTs - Date.now())/1000;

        this.moveTo(diff);

    };

    this.removePassedObjets = function(){

        var childrenToRemove = [];

        var rescale = false;

        _(_this.container.children).forEach(function(child) {

            return typeof(child) === 'undefined' ||

                (isHidden(child) && childrenToRemove.push(child));

        });

        childrenToRemove.forEach(function(child) {

        	if (_this.dynamicRange && (_this.range.bottom === child.note || child.note === _this.range.top)){

                rescale = true;

            }

            _this.container.removeChild(child);

        });

        //externalize this test to avoid repeated call to the function rescaleScene in the previous loop

        if (rescale){

            _this.rescaleScene();

        }

    };

    this.start = function() {

        if(!started) {

            this.startTs = Date.now();

            this.addLine();

            started = true;

        }

        this.verticalLinesInterval = setInterval(function() { _this.addLine(); }, this.lineInterval);

        this.cleanInterval = setInterval(function () { _this.removePassedObjets(); }, 1000 * this.width / this.pixelsPerSecond );

    };

    this.stop = function() {

        clearInterval(this.verticalLinesInterval);

        clearInterval(this.cleanInterval);

    };

}

module.exports = PianoRoll;