/**
 * @author mrdoob / http://mrdoob.com/
 */

export class Stats {

    private container: any;
    private mode: number;
    private fpsDiv: any;
    private msDiv: any;
    private startTime: number;
    private ms = 0;
    private msMin = Infinity;
    private msMax = 0;
    private fps = 0;
    private fpsMin = Infinity;
    private fpsMax = 0;
    private frames = 0;
    private prevTime;
    private msText;
    private msGraph;
    private fpsGraph;
    private fpsText;

    REVISION: number = 11;

    get domElement(): any { return this.container; }

    constructor() {

        this.container = document.createElement( 'div' );
        this.startTime = Date.now();
        let prevTime = this.startTime;

        this.container.id = 'stats';
        this.container.addEventListener( 'mousedown', ( event ) => { event.preventDefault(); this.setMode( ++ this.mode % 2 ) }, false );
        this.container.style.cssText = 'width:80px;opacity:0.9;cursor:pointer';

        this.fpsDiv = document.createElement( 'div' );
        this.fpsDiv.id = 'fps';
        this.fpsDiv.style.cssText = 'padding:0 0 3px 3px;text-align:left;background-color:#002';
        this.container.appendChild(this.fpsDiv );

        this.fpsText = document.createElement( 'div' );
        this.fpsText.id = 'fpsText';
        this.fpsText.style.cssText = 'color:#0ff;font-family:Helvetica,Arial,sans-serif;font-size:9px;font-weight:bold;line-height:15px';
        this.fpsText.innerHTML = 'FPS';
        this.fpsDiv.appendChild( this.fpsText );

        this.fpsGraph = document.createElement( 'div' );
        this.fpsGraph.id = 'fpsGraph';
        this.fpsGraph.style.cssText = 'position:relative;width:74px;height:30px;background-color:#0ff';
        this.fpsDiv.appendChild( this.fpsGraph );

        while ( this.fpsGraph.children.length < 74 ) {

            var bar = document.createElement( 'span' );
            bar.style.cssText = 'width:1px;height:30px;float:left;background-color:#113';
            this.fpsGraph.appendChild( bar );

        }

        this.msDiv = document.createElement( 'div' );
        this.msDiv.id = 'ms';
        this.msDiv.style.cssText = 'padding:0 0 3px 3px;text-align:left;background-color:#020;display:none';
        this.container.appendChild(this.msDiv );

        this.msText = document.createElement( 'div' );
        this.msText.id = 'msText';
        this.msText.style.cssText = 'color:#0f0;font-family:Helvetica,Arial,sans-serif;font-size:9px;font-weight:bold;line-height:15px';
        this.msText.innerHTML = 'MS';
        this.msDiv.appendChild( this.msText );

        this.msGraph = document.createElement( 'div' );
        this.msGraph.id = 'msGraph';
        this.msGraph.style.cssText = 'position:relative;width:74px;height:30px;background-color:#0f0';
        this.msDiv.appendChild( this.msGraph );

        while ( this.msGraph.children.length < 74 ) {

            var bar = document.createElement( 'span' );
            bar.style.cssText = 'width:1px;height:30px;float:left;background-color:#131';
            this.msGraph.appendChild( bar );

        }
    }

	updateGraph ( dom, value ) {

		var child = dom.appendChild( dom.firstChild );
		child.style.height = value + 'px';

	}


    setMode( value ) {

		this.mode = value;

		switch ( this.mode ) {

			case 0:
                this.fpsDiv.style.display = 'block';
                this.msDiv.style.display = 'none';
				break;
			case 1:
                this.fpsDiv.style.display = 'none';
                this.msDiv.style.display = 'block';
				break;
		}

    }

	begin() {

		this.startTime = Date.now();

	}

	end() {

		var time = Date.now();

		this.ms = time - this.startTime;
        this.msMin = Math.min(this.msMin, this.ms );
        this.msMax = Math.max(this.msMax, this.ms );

        this.msText.textContent = this.ms + ' MS (' + this.msMin + '-' + this.msMax + ')';
        this.updateGraph(this.msGraph, Math.min(30, 30 - (this.ms / 200 ) * 30 ) );

        this.frames ++;

        if (time > this.prevTime + 1000 ) {

            this.fps = Math.round((this.frames * 1000) / (time - this.prevTime ) );
            this.fpsMin = Math.min(this.fpsMin, this.fps );
            this.fpsMax = Math.max(this.fpsMax, this.fps );

            this.fpsText.textContent = this.fps + ' FPS (' + this.fpsMin + '-' + this.fpsMax + ')';
            this.updateGraph(this.fpsGraph, Math.min(30, 30 - (this.fps / 100 ) * 30 ) );

            this.prevTime = time;
            this.frames = 0;

		}

		return time;

	}

	update () {

		this.startTime = this.end();

	}


}