/**
 * @author       Richard Davey <rich@photonstorm.com>
 * @copyright    2018 Photon Storm Ltd.
 * @license      {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
 */

var Utils = require('../../../renderer/webgl/Utils');

/**
 * Renders this Game Object with the WebGL Renderer to the given Camera.
 * The object will not render if any of its renderFlags are set or it is being actively filtered out by the Camera.
 * This method should not be called directly. It is a utility function of the Render module.
 *
 * @method Phaser.GameObjects.Polygon#renderWebGL
 * @since 3.13.0
 * @private
 *
 * @param {Phaser.Renderer.WebGL.WebGLRenderer} renderer - A reference to the current active WebGL renderer.
 * @param {Phaser.GameObjects.Polygon} src - The Game Object being rendered in this call.
 * @param {number} interpolationPercentage - Reserved for future use and custom pipelines.
 * @param {Phaser.Cameras.Scene2D.Camera} camera - The Camera that is rendering the Game Object.
 * @param {Phaser.GameObjects.Components.TransformMatrix} parentMatrix - This transform matrix is defined if the game object is nested
 */
var PolygonWebGLRenderer = function (renderer, src, interpolationPercentage, camera, parentMatrix)
{
    var pipeline = this.pipeline;

    var camMatrix = pipeline._tempMatrix1;
    var shapeMatrix = pipeline._tempMatrix2;
    var calcMatrix = pipeline._tempMatrix3;

    renderer.setPipeline(pipeline);

    shapeMatrix.applyITRS(src.x, src.y, src.rotation, src.scaleX, src.scaleY);

    camMatrix.copyFrom(camera.matrix);

    if (parentMatrix)
    {
        //  Multiply the camera by the parent matrix
        camMatrix.multiplyWithOffset(parentMatrix, -camera.scrollX * src.scrollFactorX, -camera.scrollY * src.scrollFactorY);

        //  Undo the camera scroll
        shapeMatrix.e = src.x;
        shapeMatrix.f = src.y;
    }
    else
    {
        shapeMatrix.e -= camera.scrollX * src.scrollFactorX;
        shapeMatrix.f -= camera.scrollY * src.scrollFactorY;
    }

    camMatrix.multiply(shapeMatrix, calcMatrix);

    var i;
    var dx = src._displayOriginX + src._curveBounds.x;
    var dy = src._displayOriginY + src._curveBounds.y;

    var alpha = camera.alpha * src.alpha;

    var path = src.pathData;

    if (src.isFilled)
    {
        var fillTintColor = Utils.getTintAppendFloatAlphaAndSwap(src.fillColor, src.fillAlpha * alpha);

        var pathIndexes = src.pathIndexes;
    
        for (i = 0; i < pathIndexes.length; i += 3)
        {
            var p0 = pathIndexes[i] * 2;
            var p1 = pathIndexes[i + 1] * 2;
            var p2 = pathIndexes[i + 2] * 2;
    
            var x0 = path[p0 + 0] - dx;
            var y0 = path[p0 + 1] - dy;
            var x1 = path[p1 + 0] - dx;
            var y1 = path[p1 + 1] - dy;
            var x2 = path[p2 + 0] - dx;
            var y2 = path[p2 + 1] - dy;
    
            var tx0 = calcMatrix.getX(x0, y0);
            var ty0 = calcMatrix.getY(x0, y0);
    
            var tx1 = calcMatrix.getX(x1, y1);
            var ty1 = calcMatrix.getY(x1, y1);
    
            var tx2 = calcMatrix.getX(x2, y2);
            var ty2 = calcMatrix.getY(x2, y2);
        
            pipeline.batchTri(tx0, ty0, tx1, ty1, tx2, ty2, 0, 0, 1, 1, fillTintColor, fillTintColor, fillTintColor, pipeline.tintEffect);
        }
    }

    if (src.isStroked)
    {
        var strokeTint = pipeline.strokeTint;
        var strokeTintColor = Utils.getTintAppendFloatAlphaAndSwap(src.strokeColor, src.strokeAlpha * alpha);
    
        strokeTint.TL = strokeTintColor;
        strokeTint.TR = strokeTintColor;
        strokeTint.BL = strokeTintColor;
        strokeTint.BR = strokeTintColor;

        var pathLength = path.length - 1;
        var lineWidth = src.lineWidth;
        var halfLineWidth = lineWidth / 2;

        var px1 = path[0] - dx;
        var py1 = path[1] - dy;

        if (!src.closePath)
        {
            pathLength -= 2;
        }

        for (i = 2; i < pathLength; i += 2)
        {
            var px2 = path[i] - dx;
            var py2 = path[i + 1] - dy;

            pipeline.batchLine(
                px1,
                py1,
                px2,
                py2,
                halfLineWidth,
                halfLineWidth,
                lineWidth,
                i - 2,
                (src.closePath) ? (i === pathLength - 1) : false
            );

            px1 = px2;
            py1 = py2;
        }
    }
};

module.exports = PolygonWebGLRenderer;