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/**
 * 图片绘制
 * @module zrender/shape/Image
 * @author pissang(https://www.github.com/pissang)
 * @example
 *     var ImageShape = require('zrender/shape/Image');
 *     var image = new ImageShape({
 *         style: {
 *             image: 'test.jpg',
 *             x: 100,
 *             y: 100
 *         }
 *     });
 *     zr.addShape(image);
 */

/**
 * @typedef {Object} IImageStyle
 * @property {string|HTMLImageElement|HTMLCanvasElement} image 图片url或者图片对象
 * @property {number} x 左上角横坐标
 * @property {number} y 左上角纵坐标
 * @property {number} [width] 绘制到画布上的宽度,默认为图片宽度
 * @property {number} [height] 绘制到画布上的高度,默认为图片高度
 * @property {number} [sx=0] 从图片中裁剪的左上角横坐标
 * @property {number} [sy=0] 从图片中裁剪的左上角纵坐标
 * @property {number} [sWidth] 从图片中裁剪的宽度,默认为图片高度
 * @property {number} [sHeight] 从图片中裁剪的高度,默认为图片高度
 * @property {number} [opacity=1] 绘制透明度
 * @property {number} [shadowBlur=0] 阴影模糊度,大于0有效
 * @property {string} [shadowColor='#000000'] 阴影颜色
 * @property {number} [shadowOffsetX=0] 阴影横向偏移
 * @property {number} [shadowOffsetY=0] 阴影纵向偏移
 * @property {string} [text] 图形中的附加文本
 * @property {string} [textColor='#000000'] 文本颜色
 * @property {string} [textFont] 附加文本样式,eg:'bold 18px verdana'
 * @property {string} [textPosition='end'] 附加文本位置, 可以是 inside, left, right, top, bottom
 * @property {string} [textAlign] 默认根据textPosition自动设置,附加文本水平对齐。
 *                                可以是start, end, left, right, center
 * @property {string} [textBaseline] 默认根据textPosition自动设置,附加文本垂直对齐。
 *                                可以是top, bottom, middle, alphabetic, hanging, ideographic
 */
define(
    function (require) {

        var Base = require('./Base');

        /**
         * @alias zrender/shape/Image
         * @constructor
         * @extends module:zrender/shape/Base
         * @param {Object} options
         */
        var ZImage = function(options) {
            Base.call(this, options);
            /**
             * 图片绘制样式
             * @name module:zrender/shape/Image#style
             * @type {module:zrender/shape/Image~IImageStyle}
             */
            /**
             * 图片高亮绘制样式
             * @name module:zrender/shape/Image#highlightStyle
             * @type {module:zrender/shape/Image~IImageStyle}
             */
        };

        ZImage.prototype = {
            
            type: 'image',

            brush : function(ctx, isHighlight, refreshNextFrame) {
                var style = this.style || {};

                if (isHighlight) {
                    // 根据style扩展默认高亮样式
                    style = this.getHighlightStyle(
                        style, this.highlightStyle || {}
                    );
                }

                var image = style.image;
                var self = this;

                if (!this._imageCache) {
                    this._imageCache = {};
                }
                if (typeof(image) === 'string') {
                    var src = image;
                    if (this._imageCache[src]) {
                        image = this._imageCache[src];
                    } else {
                        image = new Image();
                        image.onload = function () {
                            image.onload = null;
                            self.modSelf();
                            refreshNextFrame();
                        };

                        image.src = src;
                        this._imageCache[src] = image;
                    }
                }
                if (image) {
                    // 图片已经加载完成
                    if (image.nodeName.toUpperCase() == 'IMG') {
                        if (window.ActiveXObject) {
                            if (image.readyState != 'complete') {
                                return;
                            }
                        }
                        else {
                            if (!image.complete) {
                                return;
                            }
                        }
                    }
                    // Else is canvas
                    var width = style.width || image.width;
                    var height = style.height || image.height;
                    var x = style.x;
                    var y = style.y;
                    // 图片加载失败
                    if (!image.width || !image.height) {
                        return;
                    }

                    ctx.save();

                    this.doClip(ctx);

                    this.setContext(ctx, style);

                    // 设置transform
                    this.setTransform(ctx);

                    if (style.sWidth && style.sHeight) {
                        var sx = style.sx || 0;
                        var sy = style.sy || 0;
                        ctx.drawImage(
                            image,
                            sx, sy, style.sWidth, style.sHeight,
                            x, y, width, height
                        );
                    }
                    else if (style.sx && style.sy) {
                        var sx = style.sx;
                        var sy = style.sy;
                        var sWidth = width - sx;
                        var sHeight = height - sy;
                        ctx.drawImage(
                            image,
                            sx, sy, sWidth, sHeight,
                            x, y, width, height
                        );
                    }
                    else {
                        ctx.drawImage(image, x, y, width, height);
                    }
                    // 如果没设置宽和高的话自动根据图片宽高设置
                    if (!style.width) {
                        style.width = width;
                    }
                    if (!style.height) {
                        style.height = height;
                    }
                    if (!this.style.width) {
                        this.style.width = width;
                    }
                    if (!this.style.height) {
                        this.style.height = height;
                    }

                    this.drawText(ctx, style, this.style);

                    ctx.restore();
                }
            },

            /**
             * 计算返回图片的包围盒矩形
             * @param {module:zrender/shape/Image~IImageStyle} style
             * @return {module:zrender/shape/Base~IBoundingRect}
             */
            getRect: function(style) {
                return {
                    x : style.x,
                    y : style.y,
                    width : style.width,
                    height : style.height
                };
            },

            clearCache: function() {
                this._imageCache = {};
            }
        };

        require('../tool/util').inherits(ZImage, Base);
        return ZImage;
    }
);