/*
 * Copyright (C) 2015-2017 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */
(function() {

var TextStage = Utilities.createSubclass(Stage,
    function()
    {
        Stage.call(this);

        this.testElements = [];
        this._offsetIndex = 0;
    }, {

    shadowFalloff: new UnitBezier(new Point(0.015, 0.750), new Point(0.755, 0.235)),
    shimmerAverage: 0,
    shimmerMax: 0.5,
    millisecondsPerRotation: 1000 / (.26 * Math.PI * 2),
    particleDistanceX: 1.5,
    particleDistanceY: .5,
    lightnessMin: 13,
    lightnessMax: 94,
    gradients: [
        [10, 176, 176, 209, 148, 140],
        [171, 120, 154, 245, 196, 154],
        [224, 99, 99, 71, 134, 148],
        [101, 100, 117, 80, 230, 175],
        [232, 165, 30, 69, 186, 172]
    ],

    initialize: function(benchmark)
    {
        Stage.prototype.initialize.call(this, benchmark);

        this._template = document.getElementById("template");
        this._offset = this.size.subtract(Point.elementClientSize(this._template)).multiply(.5);
        this._template.style.left = this._offset.width + "px";
        this._template.style.top = this._offset.height + "px";

        this._stepProgress = 0;
    },

    tune: function(count)
    {
        if (count == 0)
            return;

        if (count < 0) {
            this._offsetIndex = Math.max(this._offsetIndex + count, 0);
            for (var i = this._offsetIndex; i < this.testElements.length; ++i)
                this.testElements[i].style.visibility = "hidden";

            this._stepProgress = 1 / this._offsetIndex;
            return;
        }

        this._offsetIndex = this._offsetIndex + count;
        this._stepProgress = 1 / this._offsetIndex;

        var index = Math.min(this._offsetIndex, this.testElements.length);
        for (var i = 0; i < index; ++i)
            this.testElements[i].style.visibility = "visible";

        if (this._offsetIndex <= this.testElements.length)
            return;

        for (var i = this.testElements.length; i < this._offsetIndex; ++i) {
            var clone = this._template.cloneNode(true);
            this.testElements.push(clone);
            this.element.insertBefore(clone, this.element.firstChild);
        }
    },

    animate: function(timeDelta) {
        var angle = Stage.dateCounterValue(this.millisecondsPerRotation);

        var progress = 0;
        var stepX = Math.sin(angle) * this.particleDistanceX;
        var stepY = Math.cos(angle) * this.particleDistanceY;
        var x = -stepX * 3;
        var y = -stepY * 3;
        var gradient = this.gradients[Math.floor(angle/(Math.PI * 2)) % this.gradients.length];
        var offset = Stage.dateCounterValue(200);
        this._template.style.transform = "translate(" + Math.floor(x) + "px," + Math.floor(y) + "px)";
        for (var i = 0; i < this._offsetIndex; ++i) {
            var element = this.testElements[i];

            var colorProgress = this.shadowFalloff.solve(progress);
            var shimmer = Math.sin(offset - colorProgress);
            colorProgress = Math.max(Math.min(colorProgress + Utilities.lerp(shimmer, this.shimmerAverage, this.shimmerMax), 1), 0);
            var r = Math.round(Utilities.lerp(colorProgress, gradient[0], gradient[3]));
            var g = Math.round(Utilities.lerp(colorProgress, gradient[1], gradient[4]));
            var b = Math.round(Utilities.lerp(colorProgress, gradient[2], gradient[5]));
            element.style.color = "rgb(" + r + "," + g + "," + b + ")";

            x += stepX;
            y += stepY;
            element.style.transform = "translate(" + Math.floor(x) + "px," + Math.floor(y) + "px)";

            progress += this._stepProgress;
        }
    },

    complexity: function()
    {
        return 1 + this._offsetIndex;
    }
});

var TextBenchmark = Utilities.createSubclass(Benchmark,
    function(options)
    {
        Benchmark.call(this, new TextStage(), options);
    }
);

window.benchmarkClass = TextBenchmark;

}());