import Utils from "../Utils.js";


/**
 * HTML operations.
 *
 * @author n1474335 [n1474335@gmail.com]
 * @copyright Crown Copyright 2016
 * @license Apache-2.0
 *
 * @namespace
 */
const HTML = {

    /**
     * @constant
     * @default
     */
    CONVERT_ALL: false,
    /**
     * @constant
     * @default
     */
    CONVERT_OPTIONS: ["Named entities where possible", "Numeric entities", "Hex entities"],

    /**
     * To HTML Entity operation.
     *
     * @param {string} input
     * @param {Object[]} args
     * @returns {string}
     */
    runToEntity: function(input, args) {
        let convertAll = args[0],
            numeric = args[1] === "Numeric entities",
            hexa = args[1] === "Hex entities";

        const charcodes = Utils.strToCharcode(input);
        let output = "";

        for (let i = 0; i < charcodes.length; i++) {
            if (convertAll && numeric) {
                output += "&#" + charcodes[i] + ";";
            } else if (convertAll && hexa) {
                output += "&#x" + Utils.hex(charcodes[i]) + ";";
            } else if (convertAll) {
                output += HTML._byteToEntity[charcodes[i]] || "&#" + charcodes[i] + ";";
            } else if (numeric) {
                if (charcodes[i] > 255 || HTML._byteToEntity.hasOwnProperty(charcodes[i])) {
                    output += "&#" + charcodes[i] + ";";
                } else {
                    output += Utils.chr(charcodes[i]);
                }
            } else if (hexa) {
                if (charcodes[i] > 255 || HTML._byteToEntity.hasOwnProperty(charcodes[i])) {
                    output += "&#x" + Utils.hex(charcodes[i]) + ";";
                } else {
                    output += Utils.chr(charcodes[i]);
                }
            } else {
                output += HTML._byteToEntity[charcodes[i]] || (
                    charcodes[i] > 255 ?
                        "&#" + charcodes[i] + ";" :
                        Utils.chr(charcodes[i])
                );
            }
        }
        return output;
    },


    /**
     * From HTML Entity operation.
     *
     * @param {string} input
     * @param {Object[]} args
     * @returns {string}
     */
    runFromEntity: function(input, args) {
        let regex = /&(#?x?[a-zA-Z0-9]{1,8});/g,
            output = "",
            m,
            i = 0;

        while ((m = regex.exec(input))) {
            // Add up to match
            for (; i < m.index;)
                output += input[i++];

            // Add match
            const bite = HTML._entityToByte[m[1]];
            if (bite) {
                output += Utils.chr(bite);
            } else if (!bite && m[1][0] === "#" && m[1].length > 1 && /^#\d{1,6}$/.test(m[1])) {
                // Numeric entity (e.g. &#10;)
                const num = m[1].slice(1, m[1].length);
                output += Utils.chr(parseInt(num, 10));
            } else if (!bite && m[1][0] === "#" && m[1].length > 3 && /^#x[\dA-F]{2,8}$/i.test(m[1])) {
                // Hex entity (e.g. &#x3A;)
                const hex = m[1].slice(2, m[1].length);
                output += Utils.chr(parseInt(hex, 16));
            } else {
                // Not a valid entity, print as normal
                for (; i < regex.lastIndex;)
                    output += input[i++];
            }

            i = regex.lastIndex;
        }
        // Add all after final match
        for (; i < input.length;)
            output += input[i++];

        return output;
    },


    /**
     * @constant
     * @default
     */
    REMOVE_INDENTATION: true,
    /**
     * @constant
     * @default
     */
    REMOVE_LINE_BREAKS: true,

    /**
     * Strip HTML tags operation.
     *
     * @param {string} input
     * @param {Object[]} args
     * @returns {string}
     */
    runStripTags: function(input, args) {
        let removeIndentation = args[0],
            removeLineBreaks = args[1];

        input = Utils.stripHtmlTags(input);

        if (removeIndentation) {
            input = input.replace(/\n[ \f\t]+/g, "\n");
        }

        if (removeLineBreaks) {
            input = input
                .replace(/^\s*\n/, "") // first line
                .replace(/(\n\s*){2,}/g, "\n"); // all others
        }

        return input;
    },


    /**
     * Parse colour code operation.
     *
     * @param {string} input
     * @param {Object[]} args
     * @returns {html}
     */
    runParseColourCode: function(input, args) {
        let m = null,
            r = 0, g = 0, b = 0, a = 1;

        // Read in the input
        if ((m = input.match(/#([a-f0-9]{2})([a-f0-9]{2})([a-f0-9]{2})/i))) {
            // Hex - #d9edf7
            r = parseInt(m[1], 16);
            g = parseInt(m[2], 16);
            b = parseInt(m[3], 16);
        } else if ((m = input.match(/rgba?\((\d{1,3}(?:\.\d+)?),\s?(\d{1,3}(?:\.\d+)?),\s?(\d{1,3}(?:\.\d+)?)(?:,\s?(\d(?:\.\d+)?))?\)/i))) {
            // RGB or RGBA - rgb(217,237,247) or rgba(217,237,247,1)
            r = parseFloat(m[1]);
            g = parseFloat(m[2]);
            b = parseFloat(m[3]);
            a = m[4] ? parseFloat(m[4]) : 1;
        } else if ((m = input.match(/hsla?\((\d{1,3}(?:\.\d+)?),\s?(\d{1,3}(?:\.\d+)?)%,\s?(\d{1,3}(?:\.\d+)?)%(?:,\s?(\d(?:\.\d+)?))?\)/i))) {
            // HSL or HSLA - hsl(200, 65%, 91%) or hsla(200, 65%, 91%, 1)
            let h_ = parseFloat(m[1]) / 360,
                s_ = parseFloat(m[2]) / 100,
                l_ = parseFloat(m[3]) / 100,
                rgb_ = HTML._hslToRgb(h_, s_, l_);

            r = rgb_[0];
            g = rgb_[1];
            b = rgb_[2];
            a = m[4] ? parseFloat(m[4]) : 1;
        } else if ((m = input.match(/cmyk\((\d(?:\.\d+)?),\s?(\d(?:\.\d+)?),\s?(\d(?:\.\d+)?),\s?(\d(?:\.\d+)?)\)/i))) {
            // CMYK - cmyk(0.12, 0.04, 0.00, 0.03)
            let c_ = parseFloat(m[1]),
                m_ = parseFloat(m[2]),
                y_ = parseFloat(m[3]),
                k_ = parseFloat(m[4]);

            r = Math.round(255 * (1 - c_) * (1 - k_));
            g = Math.round(255 * (1 - m_) * (1 - k_));
            b = Math.round(255 * (1 - y_) * (1 - k_));
        }

        let hsl_ = HTML._rgbToHsl(r, g, b),
            h = Math.round(hsl_[0] * 360),
            s = Math.round(hsl_[1] * 100),
            l = Math.round(hsl_[2] * 100),
            k = 1 - Math.max(r/255, g/255, b/255),
            c = (1 - r/255 - k) / (1 - k),
            y = (1 - b/255 - k) / (1 - k);

        m = (1 - g/255 - k) / (1 - k);

        c = isNaN(c) ? "0" : c.toFixed(2);
        m = isNaN(m) ? "0" : m.toFixed(2);
        y = isNaN(y) ? "0" : y.toFixed(2);
        k = k.toFixed(2);

        let hex = "#" +
                Utils.padLeft(Math.round(r).toString(16), 2) +
                Utils.padLeft(Math.round(g).toString(16), 2) +
                Utils.padLeft(Math.round(b).toString(16), 2),
            rgb  = "rgb(" + r + ", " + g + ", " + b + ")",
            rgba = "rgba(" + r + ", " + g + ", " + b + ", " + a + ")",
            hsl  = "hsl(" + h + ", " + s + "%, " + l + "%)",
            hsla = "hsla(" + h + ", " + s + "%, " + l + "%, " + a + ")",
            cmyk = "cmyk(" + c + ", " + m + ", " + y + ", " + k + ")";

        // Generate output
        return "<div id='colorpicker' style='display: inline-block'></div>" +
            "Hex:  " + hex + "\n" +
            "RGB:  " + rgb + "\n" +
            "RGBA: " + rgba + "\n" +
            "HSL:  " + hsl + "\n" +
            "HSLA: " + hsla + "\n" +
            "CMYK: " + cmyk +
            "<script>\
                $('#colorpicker').colorpicker({\
                    format: 'rgba',\
                    color: '" + rgba + "',\
                    container: true,\
                    inline: true,\
                }).on('changeColor', function(e) {\
                    var color = e.color.toRGB();\
                    document.getElementById('input-text').value = 'rgba(' +\
                        color.r + ', ' + color.g + ', ' + color.b + ', ' + color.a + ')';\
                    window.app.autoBake();\
                });\
            </script>";
    },


    /**
     * Converts an HSL color value to RGB. Conversion formula
     * adapted from http://en.wikipedia.org/wiki/HSL_colorSpace.
     * Assumes h, s, and l are contained in the set [0, 1] and
     * returns r, g, and b in the set [0, 255].
     *
     * @private
     * @author Mohsen (http://stackoverflow.com/a/9493060)
     *
     * @param {number} h - The hue
     * @param {number} s - The saturation
     * @param {number} l - The lightness
     * @return {Array} The RGB representation
     */
    _hslToRgb: function(h, s, l){
        let r, g, b;

        if (s === 0){
            r = g = b = l; // achromatic
        } else {
            const hue2rgb = function hue2rgb(p, q, t) {
                if (t < 0) t += 1;
                if (t > 1) t -= 1;
                if (t < 1/6) return p + (q - p) * 6 * t;
                if (t < 1/2) return q;
                if (t < 2/3) return p + (q - p) * (2/3 - t) * 6;
                return p;
            };

            const q = l < 0.5 ? l * (1 + s) : l + s - l * s;
            const p = 2 * l - q;
            r = hue2rgb(p, q, h + 1/3);
            g = hue2rgb(p, q, h);
            b = hue2rgb(p, q, h - 1/3);
        }

        return [Math.round(r * 255), Math.round(g * 255), Math.round(b * 255)];
    },


    /**
     * Converts an RGB color value to HSL. Conversion formula
     * adapted from http://en.wikipedia.org/wiki/HSL_colorSpace.
     * Assumes r, g, and b are contained in the set [0, 255] and
     * returns h, s, and l in the set [0, 1].
     *
     * @private
     * @author Mohsen (http://stackoverflow.com/a/9493060)
     *
     * @param {number} r - The red color value
     * @param {number} g - The green color value
     * @param {number} b - The blue color value
     * @return {Array} The HSL representation
     */
    _rgbToHsl: function(r, g, b) {
        r /= 255; g /= 255; b /= 255;
        let max = Math.max(r, g, b),
            min = Math.min(r, g, b),
            h, s, l = (max + min) / 2;

        if (max === min) {
            h = s = 0; // achromatic
        } else {
            const d = max - min;
            s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
            switch (max) {
                case r: h = (g - b) / d + (g < b ? 6 : 0); break;
                case g: h = (b - r) / d + 2; break;
                case b: h = (r - g) / d + 4; break;
            }
            h /= 6;
        }

        return [h, s, l];
    },


    /**
     * Lookup table to translate byte values to their HTML entity codes.
     *
     * @private
     * @constant
     */
    _byteToEntity: {
        34: "&quot;",
        38: "&amp;",
        39: "&apos;",
        60: "&lt;",
        62: "&gt;",
        160: "&nbsp;",
        161: "&iexcl;",
        162: "&cent;",
        163: "&pound;",
        164: "&curren;",
        165: "&yen;",
        166: "&brvbar;",
        167: "&sect;",
        168: "&uml;",
        169: "&copy;",
        170: "&ordf;",
        171: "&laquo;",
        172: "&not;",
        173: "&shy;",
        174: "&reg;",
        175: "&macr;",
        176: "&deg;",
        177: "&plusmn;",
        178: "&sup2;",
        179: "&sup3;",
        180: "&acute;",
        181: "&micro;",
        182: "&para;",
        183: "&middot;",
        184: "&cedil;",
        185: "&sup1;",
        186: "&ordm;",
        187: "&raquo;",
        188: "&frac14;",
        189: "&frac12;",
        190: "&frac34;",
        191: "&iquest;",
        192: "&Agrave;",
        193: "&Aacute;",
        194: "&Acirc;",
        195: "&Atilde;",
        196: "&Auml;",
        197: "&Aring;",
        198: "&AElig;",
        199: "&Ccedil;",
        200: "&Egrave;",
        201: "&Eacute;",
        202: "&Ecirc;",
        203: "&Euml;",
        204: "&Igrave;",
        205: "&Iacute;",
        206: "&Icirc;",
        207: "&Iuml;",
        208: "&ETH;",
        209: "&Ntilde;",
        210: "&Ograve;",
        211: "&Oacute;",
        212: "&Ocirc;",
        213: "&Otilde;",
        214: "&Ouml;",
        215: "&times;",
        216: "&Oslash;",
        217: "&Ugrave;",
        218: "&Uacute;",
        219: "&Ucirc;",
        220: "&Uuml;",
        221: "&Yacute;",
        222: "&THORN;",
        223: "&szlig;",
        224: "&agrave;",
        225: "&aacute;",
        226: "&acirc;",
        227: "&atilde;",
        228: "&auml;",
        229: "&aring;",
        230: "&aelig;",
        231: "&ccedil;",
        232: "&egrave;",
        233: "&eacute;",
        234: "&ecirc;",
        235: "&euml;",
        236: "&igrave;",
        237: "&iacute;",
        238: "&icirc;",
        239: "&iuml;",
        240: "&eth;",
        241: "&ntilde;",
        242: "&ograve;",
        243: "&oacute;",
        244: "&ocirc;",
        245: "&otilde;",
        246: "&ouml;",
        247: "&divide;",
        248: "&oslash;",
        249: "&ugrave;",
        250: "&uacute;",
        251: "&ucirc;",
        252: "&uuml;",
        253: "&yacute;",
        254: "&thorn;",
        255: "&yuml;",
        338: "&OElig;",
        339: "&oelig;",
        352: "&Scaron;",
        353: "&scaron;",
        376: "&Yuml;",
        402: "&fnof;",
        710: "&circ;",
        732: "&tilde;",
        913: "&Alpha;",
        914: "&Beta;",
        915: "&Gamma;",
        916: "&Delta;",
        917: "&Epsilon;",
        918: "&Zeta;",
        919: "&Eta;",
        920: "&Theta;",
        921: "&Iota;",
        922: "&Kappa;",
        923: "&Lambda;",
        924: "&Mu;",
        925: "&Nu;",
        926: "&Xi;",
        927: "&Omicron;",
        928: "&Pi;",
        929: "&Rho;",
        931: "&Sigma;",
        932: "&Tau;",
        933: "&Upsilon;",
        934: "&Phi;",
        935: "&Chi;",
        936: "&Psi;",
        937: "&Omega;",
        945: "&alpha;",
        946: "&beta;",
        947: "&gamma;",
        948: "&delta;",
        949: "&epsilon;",
        950: "&zeta;",
        951: "&eta;",
        952: "&theta;",
        953: "&iota;",
        954: "&kappa;",
        955: "&lambda;",
        956: "&mu;",
        957: "&nu;",
        958: "&xi;",
        959: "&omicron;",
        960: "&pi;",
        961: "&rho;",
        962: "&sigmaf;",
        963: "&sigma;",
        964: "&tau;",
        965: "&upsilon;",
        966: "&phi;",
        967: "&chi;",
        968: "&psi;",
        969: "&omega;",
        977: "&thetasym;",
        978: "&upsih;",
        982: "&piv;",
        8194: "&ensp;",
        8195: "&emsp;",
        8201: "&thinsp;",
        8204: "&zwnj;",
        8205: "&zwj;",
        8206: "&lrm;",
        8207: "&rlm;",
        8211: "&ndash;",
        8212: "&mdash;",
        8216: "&lsquo;",
        8217: "&rsquo;",
        8218: "&sbquo;",
        8220: "&ldquo;",
        8221: "&rdquo;",
        8222: "&bdquo;",
        8224: "&dagger;",
        8225: "&Dagger;",
        8226: "&bull;",
        8230: "&hellip;",
        8240: "&permil;",
        8242: "&prime;",
        8243: "&Prime;",
        8249: "&lsaquo;",
        8250: "&rsaquo;",
        8254: "&oline;",
        8260: "&frasl;",
        8364: "&euro;",
        8465: "&image;",
        8472: "&weierp;",
        8476: "&real;",
        8482: "&trade;",
        8501: "&alefsym;",
        8592: "&larr;",
        8593: "&uarr;",
        8594: "&rarr;",
        8595: "&darr;",
        8596: "&harr;",
        8629: "&crarr;",
        8656: "&lArr;",
        8657: "&uArr;",
        8658: "&rArr;",
        8659: "&dArr;",
        8660: "&hArr;",
        8704: "&forall;",
        8706: "&part;",
        8707: "&exist;",
        8709: "&empty;",
        8711: "&nabla;",
        8712: "&isin;",
        8713: "&notin;",
        8715: "&ni;",
        8719: "&prod;",
        8721: "&sum;",
        8722: "&minus;",
        8727: "&lowast;",
        8730: "&radic;",
        8733: "&prop;",
        8734: "&infin;",
        8736: "&ang;",
        8743: "&and;",
        8744: "&or;",
        8745: "&cap;",
        8746: "&cup;",
        8747: "&int;",
        8756: "&there4;",
        8764: "&sim;",
        8773: "&cong;",
        8776: "&asymp;",
        8800: "&ne;",
        8801: "&equiv;",
        8804: "&le;",
        8805: "&ge;",
        8834: "&sub;",
        8835: "&sup;",
        8836: "&nsub;",
        8838: "&sube;",
        8839: "&supe;",
        8853: "&oplus;",
        8855: "&otimes;",
        8869: "&perp;",
        8901: "&sdot;",
        8942: "&vellip;",
        8968: "&lceil;",
        8969: "&rceil;",
        8970: "&lfloor;",
        8971: "&rfloor;",
        9001: "&lang;",
        9002: "&rang;",
        9674: "&loz;",
        9824: "&spades;",
        9827: "&clubs;",
        9829: "&hearts;",
        9830: "&diams;",
    },


    /**
     * Lookup table to translate HTML entity codes to their byte values.
     *
     * @private
     * @constant
     */
    _entityToByte: {
        "quot": 34,
        "amp": 38,
        "apos": 39,
        "lt": 60,
        "gt": 62,
        "nbsp": 160,
        "iexcl": 161,
        "cent": 162,
        "pound": 163,
        "curren": 164,
        "yen": 165,
        "brvbar": 166,
        "sect": 167,
        "uml": 168,
        "copy": 169,
        "ordf": 170,
        "laquo": 171,
        "not": 172,
        "shy": 173,
        "reg": 174,
        "macr": 175,
        "deg": 176,
        "plusmn": 177,
        "sup2": 178,
        "sup3": 179,
        "acute": 180,
        "micro": 181,
        "para": 182,
        "middot": 183,
        "cedil": 184,
        "sup1": 185,
        "ordm": 186,
        "raquo": 187,
        "frac14": 188,
        "frac12": 189,
        "frac34": 190,
        "iquest": 191,
        "Agrave": 192,
        "Aacute": 193,
        "Acirc": 194,
        "Atilde": 195,
        "Auml": 196,
        "Aring": 197,
        "AElig": 198,
        "Ccedil": 199,
        "Egrave": 200,
        "Eacute": 201,
        "Ecirc": 202,
        "Euml": 203,
        "Igrave": 204,
        "Iacute": 205,
        "Icirc": 206,
        "Iuml": 207,
        "ETH": 208,
        "Ntilde": 209,
        "Ograve": 210,
        "Oacute": 211,
        "Ocirc": 212,
        "Otilde": 213,
        "Ouml": 214,
        "times": 215,
        "Oslash": 216,
        "Ugrave": 217,
        "Uacute": 218,
        "Ucirc": 219,
        "Uuml": 220,
        "Yacute": 221,
        "THORN": 222,
        "szlig": 223,
        "agrave": 224,
        "aacute": 225,
        "acirc": 226,
        "atilde": 227,
        "auml": 228,
        "aring": 229,
        "aelig": 230,
        "ccedil": 231,
        "egrave": 232,
        "eacute": 233,
        "ecirc": 234,
        "euml": 235,
        "igrave": 236,
        "iacute": 237,
        "icirc": 238,
        "iuml": 239,
        "eth": 240,
        "ntilde": 241,
        "ograve": 242,
        "oacute": 243,
        "ocirc": 244,
        "otilde": 245,
        "ouml": 246,
        "divide": 247,
        "oslash": 248,
        "ugrave": 249,
        "uacute": 250,
        "ucirc": 251,
        "uuml": 252,
        "yacute": 253,
        "thorn": 254,
        "yuml": 255,
        "OElig": 338,
        "oelig": 339,
        "Scaron": 352,
        "scaron": 353,
        "Yuml": 376,
        "fnof": 402,
        "circ": 710,
        "tilde": 732,
        "Alpha": 913,
        "Beta": 914,
        "Gamma": 915,
        "Delta": 916,
        "Epsilon": 917,
        "Zeta": 918,
        "Eta": 919,
        "Theta": 920,
        "Iota": 921,
        "Kappa": 922,
        "Lambda": 923,
        "Mu": 924,
        "Nu": 925,
        "Xi": 926,
        "Omicron": 927,
        "Pi": 928,
        "Rho": 929,
        "Sigma": 931,
        "Tau": 932,
        "Upsilon": 933,
        "Phi": 934,
        "Chi": 935,
        "Psi": 936,
        "Omega": 937,
        "alpha": 945,
        "beta": 946,
        "gamma": 947,
        "delta": 948,
        "epsilon": 949,
        "zeta": 950,
        "eta": 951,
        "theta": 952,
        "iota": 953,
        "kappa": 954,
        "lambda": 955,
        "mu": 956,
        "nu": 957,
        "xi": 958,
        "omicron": 959,
        "pi": 960,
        "rho": 961,
        "sigmaf": 962,
        "sigma": 963,
        "tau": 964,
        "upsilon": 965,
        "phi": 966,
        "chi": 967,
        "psi": 968,
        "omega": 969,
        "thetasym": 977,
        "upsih": 978,
        "piv": 982,
        "ensp": 8194,
        "emsp": 8195,
        "thinsp": 8201,
        "zwnj": 8204,
        "zwj": 8205,
        "lrm": 8206,
        "rlm": 8207,
        "ndash": 8211,
        "mdash": 8212,
        "lsquo": 8216,
        "rsquo": 8217,
        "sbquo": 8218,
        "ldquo": 8220,
        "rdquo": 8221,
        "bdquo": 8222,
        "dagger": 8224,
        "Dagger": 8225,
        "bull": 8226,
        "hellip": 8230,
        "permil": 8240,
        "prime": 8242,
        "Prime": 8243,
        "lsaquo": 8249,
        "rsaquo": 8250,
        "oline": 8254,
        "frasl": 8260,
        "euro": 8364,
        "image": 8465,
        "weierp": 8472,
        "real": 8476,
        "trade": 8482,
        "alefsym": 8501,
        "larr": 8592,
        "uarr": 8593,
        "rarr": 8594,
        "darr": 8595,
        "harr": 8596,
        "crarr": 8629,
        "lArr": 8656,
        "uArr": 8657,
        "rArr": 8658,
        "dArr": 8659,
        "hArr": 8660,
        "forall": 8704,
        "part": 8706,
        "exist": 8707,
        "empty": 8709,
        "nabla": 8711,
        "isin": 8712,
        "notin": 8713,
        "ni": 8715,
        "prod": 8719,
        "sum": 8721,
        "minus": 8722,
        "lowast": 8727,
        "radic": 8730,
        "prop": 8733,
        "infin": 8734,
        "ang": 8736,
        "and": 8743,
        "or": 8744,
        "cap": 8745,
        "cup": 8746,
        "int": 8747,
        "there4": 8756,
        "sim": 8764,
        "cong": 8773,
        "asymp": 8776,
        "ne": 8800,
        "equiv": 8801,
        "le": 8804,
        "ge": 8805,
        "sub": 8834,
        "sup": 8835,
        "nsub": 8836,
        "sube": 8838,
        "supe": 8839,
        "oplus": 8853,
        "otimes": 8855,
        "perp": 8869,
        "sdot": 8901,
        "vellip": 8942,
        "lceil": 8968,
        "rceil": 8969,
        "lfloor": 8970,
        "rfloor": 8971,
        "lang": 9001,
        "rang": 9002,
        "loz": 9674,
        "spades": 9824,
        "clubs": 9827,
        "hearts": 9829,
        "diams": 9830,
    },

};

export default HTML;