(function (H) {
    if (!H.exporting) {
        H.exporting = function () {
        };
    }

    // This will be redefined later;
    var oldExport = H.Chart.prototype.exportChart;
    H.Chart.prototype.exportChart = function () {
    };

    // Set the URL of the export server to a non-existant one, just to be sure.
    H.getOptions().exporting.url = "http://127.0.0.1:666/";

    var MIME_TYPES = {
        "PDF": "application/pdf",
        "PNG": "image/png",
        "JPEG": "image/jpeg",
        "SVG": "image/svg+xml",
        "CSV": "text/csv",
        "XLS": "application/vnd.ms-excel"
    };

    var MIME_TYPE_TO_EXTENSION = {
        "application/pdf": ".pdf",
        "image/png": ".png",
        "image/jpeg": ".jpeg",
        "image/svg+xml": ".svg",
        "text/csv": ".csv",
        "application/vnd.ms-excel": ".xls"
    };

    var TRANSLATION_KEY_TO_MIME_TYPES = {
        "downloadPDF": "application/pdf",
        "downloadPNG": "image/png",
        "downloadJPEG": "image/jpeg",
        "downloadSVG": "image/svg+xml"
    };
    TRANSLATION_KEY_TO_MIME_TYPES[H.getOptions().lang.downloadCSV || '生成CSV'] = "text/csv";
    TRANSLATION_KEY_TO_MIME_TYPES[H.getOptions().lang.downloadXLS || '生成XLS'] = "application/vnd.ms-excel";

    // This var indicates if the browser supports HTML5 download feature
    var browserSupportDownload = false;
    var a = document.createElement('a');
    if (typeof window.btoa != "undefined" && typeof a.download != "undefined") {
        browserSupportDownload = true;
    }
    // This is for IE support of Blob
    var browserSupportBlob = window.Blob && window.navigator.msSaveOrOpenBlob;

    /**
     * Describes the MIME types that this module supports.
     * Additionnally, you can call `support(mimeType)` to check
     * that this type is available on the current platform.
     */
    H.exporting.MIME_TYPES = MIME_TYPES;

    var supportStatus = {};
    var buildSupportStatus = function () {
        var hasDownloadOrBlob = browserSupportDownload || browserSupportBlob;

        supportStatus[MIME_TYPES.CSV] = hasDownloadOrBlob && (H.Chart.prototype.getCSV !== undefined);
        supportStatus[MIME_TYPES.XLS] = hasDownloadOrBlob && (H.Chart.prototype.getTable !== undefined);

        var svgSupport = (H.Chart.prototype.getSVG !== undefined);

        supportStatus[MIME_TYPES.SVG] = hasDownloadOrBlob && svgSupport && (window.btoa !== undefined);

        // Canvg uses a function named RGBColor, but it's also a not widely known standard object
        // http://www.w3.org/TR/2000/REC-DOM-Level-2-Style-20001113/css.html#CSS-RGBColor
        // Fugly, but heh.
        var rbgColorSupport = false;
        try {
            rbgColorSupport = (new RGBColor("").ok) !== undefined;
        }
        catch (e) {
        }
        // We also check that a canvas element can be created.
        var canvas = document.createElement('canvas');
        var canvgSupport = typeof canvg !== "undefined" && typeof RGBColor != "undefined" &&
            rbgColorSupport && canvas.getContext && canvas.getContext('2d');

        supportStatus[MIME_TYPES.PNG] = hasDownloadOrBlob && svgSupport && canvgSupport;
        // On IE, it relies on canvas.msToBlob() which always returns PNG
        supportStatus[MIME_TYPES.JPEG] = /* useless, see last param: hasDownloadOrBlob && */
            svgSupport && canvgSupport && browserSupportDownload;

        supportStatus[MIME_TYPES.PDF] = hasDownloadOrBlob && svgSupport && canvgSupport && (typeof jsPDF !== "undefined");

    };
    buildSupportStatus();

    /**
     * Checks if the supplied MIME type is available on the
     * current platform for a chart to be exported in.
     * @param mimeType {String} The MIME type.
     * @returns {boolean} <code>true</code> if the MIME type is available on the
     *    current platform.
     */
    H.exporting.supports = function (mimeType) {
        if (supportStatus[mimeType]) {
            return supportStatus[mimeType];
        }
        else {
            return false;
        }
    };


    // Remove unsupported download features from the menu
    var menuItems = H.getOptions().exporting.buttons.contextButton.menuItems,
        menuItem,
        textKey,
        text,
        mimeType,
        handlerBuilder = function (mimeType) {
            return function () {
                this.exportChartLocal({
                    type: mimeType,
                    csv: {
                        itemDelimiter: ';'
                    }
                });
            }
        };
    for (var i in menuItems) {
        menuItem = menuItems[i];
        textKey = menuItems[i].textKey;
        text = menuItems[i].text; // export-csv do not use a textKey attribute
        mimeType = TRANSLATION_KEY_TO_MIME_TYPES[textKey] || TRANSLATION_KEY_TO_MIME_TYPES[text];
        if (mimeType) {
            if (!H.exporting.supports(mimeType)) {
                // Setting enabled = false isn't enough.
                delete menuItems[i];
            }
            else {
                // Redefines click handler to use our method.
                menuItems[i].onclick = handlerBuilder(mimeType);
            }
        }
    }

    /*
     * Converts a SVG string to a canvas element
     * thanks to canvg.
     * @param svg {String} A SVG string.
     * @param width {Integer} The rasterized width.
     * @param height {Integer} The rasterized height.
     * @return {DOMNode} a canvas element.
     */
    var svgToCanvas = function (svg, width, height) {
        var canvas = document.createElement('canvas');

        canvas.setAttribute('width', width);
        canvas.setAttribute('height', height);

        canvas.getContext('2d').drawSvg(svg, 0, 0, width, height);

        return canvas;
    };

    /**
     * An object to simplifies the retrieval of options in
     * multiple bundles.
     * @param opts {Object} Multiple, an object containing options.
     */
    var Opt = function (opts1, opt2, dotdotdot) {
        this.bundles = arguments;
    };

    /**
     * Fetch the value associated with the specified key in the bundles.
     * First one defined is the one returned.
     * @param key {String} The key.
     * @param value {mixed} The first defined value in the bundles or
     *    <code>undefined</code> if none is found.
     */
    Opt.prototype.get = function (key) {
        for (var i = 0; i < this.bundles.length; i++) {
            if (this.bundles[i] && this.bundles[i][key] !== undefined) {
                return this.bundles[i][key];
            }
        }
        return undefined;
    };

    // Default options.
    var defaultExportOptions = {
        type: MIME_TYPES.PNG,
        scale: 2,
        filename: "chart",
        csv: {
            useLocalDecimalPoint: true
        }
    };

    /**
     * Redefines the export function of the official exporting module.
     * @param options {Object} Overload the export options defined in the chart.
     * @param chartOptions {Object} Additionnal chart options.
     */
    H.Chart.prototype.exportChartLocal = function (options, chartOptions) {
        var opt = new Opt(options, this.options.exporting, defaultExportOptions);

        var type = opt.get("type");
        if (!H.exporting.supports(type)) {
            throw new Error("Unsupported export format on this platform: " + type);
        }

        var filename = opt.get("filename") + MIME_TYPE_TO_EXTENSION[type];

        var data = {
            content: undefined,
            datauri: undefined,
            blob: undefined
        };

        if (type == MIME_TYPES.CSV) {
            // Copies some values from the options, so we can set it and change those
            // through the options argument.
            var hasCSVOptions = this.options.exporting && this.options.exporting.csv;
            var csvOpt = new Opt((options || {}).csv, (this.options.exporting || {}).csv, defaultExportOptions.csv);

            var oldOptions = {},
                optionsToCopy = ["dateFormat", "itemDelimiter", "lineDelimiter"],
                optionToCopy;
            for (var i in optionsToCopy) {
                optionToCopy = optionsToCopy[i];
                if (csvOpt.get(optionToCopy)) {
                    if (!this.options.exporting) {
                        this.options.exporting = {};
                    }
                    if (!this.options.exporting.csv) {
                        this.options.exporting.csv = {};
                    }

                    oldOptions[optionToCopy] = this.options.exporting.csv[optionToCopy];
                    this.options.exporting.csv[optionToCopy] = csvOpt.get(optionToCopy);
                }
            }

            var useLocalDecimalPoint = csvOpt.get("useLocalDecimalPoint");

            var csv = this.getCSV(useLocalDecimalPoint);
            data.content = csv;

            if (hasCSVOptions) {
                for (var i in optionsToCopy) {
                    optionToCopy = optionsToCopy[i];
                    if (csvOpt.get(optionToCopy)) {
                        this.options.exporting.csv[optionToCopy] = oldOptions[optionToCopy];
                    }
                }
            }
            else {
                delete this.options.exporting.csv;
            }
        }
        else if (type == MIME_TYPES.XLS) {
            // Same as above
            var hasCSVOptions = this.options.exporting && this.options.exporting.csv;
            var csvOpt = new Opt((options || {}).csv, (this.options.exporting || {}).csv, defaultExportOptions.csv);

            var oldOptions = {},
                optionsToCopy = ["dateFormat"],
                optionToCopy;
            for (var i in optionsToCopy) {
                optionToCopy = optionsToCopy[i];
                if (csvOpt.get(optionToCopy)) {
                    if (!this.options.exporting) {
                        this.options.exporting = {};
                    }
                    if (!this.options.exporting.csv) {
                        this.options.exporting.csv = {};
                    }

                    oldOptions[optionToCopy] = this.options.exporting.csv[optionToCopy];
                    this.options.exporting.csv[optionToCopy] = csvOpt.get(optionToCopy);
                }
            }

            var useLocalDecimalPoint = csvOpt.get("useLocalDecimalPoint");

            var xls = '<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns="http://www.w3.org/TR/REC-html40">' +
                '<head><!--[if gte mso 9]><xml><x:ExcelWorkbook><x:ExcelWorksheets><x:ExcelWorksheet>' +
                '<x:Name>Sheet</x:Name>' +
                '<x:WorksheetOptions><x:DisplayGridlines/></x:WorksheetOptions></x:ExcelWorksheet></x:ExcelWorksheets></x:ExcelWorkbook></xml><![endif]-->' +
                '<style>td{border:none;font-family: 微软雅黑, sans-serif;} .number{mso-number-format:"0.00";}</style>' +
                '<meta name=ProgId content=Excel.Sheet>' +
                '<meta http-equiv="content-type" charset="utf-8" content="text/html">' +
                '</head><body>' +
                this.getTable(useLocalDecimalPoint) +
                '</body></html>';
            data.content = xls;

            if (hasCSVOptions) {
                for (var i in optionsToCopy) {
                    optionToCopy = optionsToCopy[i];
                    if (csvOpt.get(optionToCopy)) {
                        this.options.exporting.csv[optionToCopy] = oldOptions[optionToCopy];
                    }
                }
            }
            else {
                delete this.options.exporting.csv;
            }
        }
        // Image processing
        else {
            var scale = opt.get("scale"),
                sourceWidth = this.options.exporting.width || opt.get("sourceWidth") || this.chartWidth,
                sourceHeight = this.options.exporting.height || opt.get("sourceHeight") || this.chartHeight,
                destWidth = sourceWidth * scale,
                destHeight = sourceHeight * scale;

            var cChartOptions = chartOptions || this.options.exporting && this.options.exporting.chartOptions || {};
            if (!cChartOptions.chart) {
                cChartOptions.chart = {width: destWidth, height: destHeight};
            }
            else {
                cChartOptions.chart.width = destWidth;
                cChartOptions.chart.height = destHeight;
            }

            var svg = this.getSVG(cChartOptions);

            if (type == MIME_TYPES.SVG) {
                data.content = svg;
            }
            else if (type == MIME_TYPES.PNG || type == MIME_TYPES.JPEG) {
                var canvas = svgToCanvas(svg, destWidth, destHeight);
                data.datauri = browserSupportDownload && canvas.toDataURL && canvas.toDataURL(type);
                data.blob = (type == MIME_TYPES.PNG) && !browserSupportDownload && canvas.msToBlob && canvas.msToBlob();
            }
            else if (type == MIME_TYPES.PDF) {
                var canvas = svgToCanvas(svg, destWidth, destHeight);

                var doc = new jsPDF('l', 'mm', [destWidth, destHeight]);
                ;
                doc.addImage(canvas, 'JPEG', 0, 0, destWidth, destHeight);

                data.datauri = browserSupportDownload && doc.output('datauristring');
                data.blob = !browserSupportDownload && doc.output('blob');
            }
        }

        if (!data.content && !(data.datauri || data.blob)) {
            throw new Error("Something went wrong while exporting the chart");
        }

        if (browserSupportDownload && (data.datauri || data.content)) {
            a = document.createElement('a');
            a.href = data.datauri || ('data:' + type + ';base64,' + window.btoa(unescape(encodeURIComponent(data.content))));
            a.download = filename;
            document.body.appendChild(a);
            a.click();
            a.remove();
        }
        else if (browserSupportBlob && (data.blob || data.content)) {
            blobObject = data.blob || new Blob([data.content], {type: type});
            window.navigator.msSaveOrOpenBlob(blobObject, filename);
        }
        else {
            window.open(data);
        }
    }

    // Forces method from export module to use the local version
    H.Chart.prototype.exportChart = H.Chart.prototype.exportChartLocal;

}(Highcharts));