/****************************************************************************
 Copyright (c) 2021-2023 Xiamen Yaji Software Co., Ltd.

 http://www.cocos.com

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights to
 use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
 of the Software, and to permit persons to whom the Software is furnished to do so,
 subject to the following conditions:

 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
****************************************************************************/

// (c) Dean McNamee <dean@gmail.com>, 2012.
// C++ port by Mapbox, Konstantin Käfer <mail@kkaefer.com>, 2014-2017.
//
// https://github.com/deanm/css-color-parser-js
// https://github.com/kkaefer/css-color-parser-cpp
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.

#include "csscolorparser.h"

#include <algorithm>
#include <cmath>
#include <cstdint>
#include <sstream>
#include "base/std/container/vector.h"

namespace CSSColorParser {

// http://www.w3.org/TR/css3-color/
struct NamedColor {
    const char *name;
    Color color;
};

const ccstd::vector<NamedColor> NAMED_COLORS = {
    {"transparent", {0, 0, 0, 0}},
    {"aliceblue", {240, 248, 255, 1}},
    {"antiquewhite", {250, 235, 215, 1}},
    {"aqua", {0, 255, 255, 1}},
    {"aquamarine", {127, 255, 212, 1}},
    {"azure", {240, 255, 255, 1}},
    {"beige", {245, 245, 220, 1}},
    {"bisque", {255, 228, 196, 1}},
    {"black", {0, 0, 0, 1}},
    {"blanchedalmond", {255, 235, 205, 1}},
    {"blue", {0, 0, 255, 1}},
    {"blueviolet", {138, 43, 226, 1}},
    {"brown", {165, 42, 42, 1}},
    {"burlywood", {222, 184, 135, 1}},
    {"cadetblue", {95, 158, 160, 1}},
    {"chartreuse", {127, 255, 0, 1}},
    {"chocolate", {210, 105, 30, 1}},
    {"coral", {255, 127, 80, 1}},
    {"cornflowerblue", {100, 149, 237, 1}},
    {"cornsilk", {255, 248, 220, 1}},
    {"crimson", {220, 20, 60, 1}},
    {"cyan", {0, 255, 255, 1}},
    {"darkblue", {0, 0, 139, 1}},
    {"darkcyan", {0, 139, 139, 1}},
    {"darkgoldenrod", {184, 134, 11, 1}},
    {"darkgray", {169, 169, 169, 1}},
    {"darkgreen", {0, 100, 0, 1}},
    {"darkgrey", {169, 169, 169, 1}},
    {"darkkhaki", {189, 183, 107, 1}},
    {"darkmagenta", {139, 0, 139, 1}},
    {"darkolivegreen", {85, 107, 47, 1}},
    {"darkorange", {255, 140, 0, 1}},
    {"darkorchid", {153, 50, 204, 1}},
    {"darkred", {139, 0, 0, 1}},
    {"darksalmon", {233, 150, 122, 1}},
    {"darkseagreen", {143, 188, 143, 1}},
    {"darkslateblue", {72, 61, 139, 1}},
    {"darkslategray", {47, 79, 79, 1}},
    {"darkslategrey", {47, 79, 79, 1}},
    {"darkturquoise", {0, 206, 209, 1}},
    {"darkviolet", {148, 0, 211, 1}},
    {"deeppink", {255, 20, 147, 1}},
    {"deepskyblue", {0, 191, 255, 1}},
    {"dimgray", {105, 105, 105, 1}},
    {"dimgrey", {105, 105, 105, 1}},
    {"dodgerblue", {30, 144, 255, 1}},
    {"firebrick", {178, 34, 34, 1}},
    {"floralwhite", {255, 250, 240, 1}},
    {"forestgreen", {34, 139, 34, 1}},
    {"fuchsia", {255, 0, 255, 1}},
    {"gainsboro", {220, 220, 220, 1}},
    {"ghostwhite", {248, 248, 255, 1}},
    {"gold", {255, 215, 0, 1}},
    {"goldenrod", {218, 165, 32, 1}},
    {"gray", {128, 128, 128, 1}},
    {"green", {0, 128, 0, 1}},
    {"greenyellow", {173, 255, 47, 1}},
    {"grey", {128, 128, 128, 1}},
    {"honeydew", {240, 255, 240, 1}},
    {"hotpink", {255, 105, 180, 1}},
    {"indianred", {205, 92, 92, 1}},
    {"indigo", {75, 0, 130, 1}},
    {"ivory", {255, 255, 240, 1}},
    {"khaki", {240, 230, 140, 1}},
    {"lavender", {230, 230, 250, 1}},
    {"lavenderblush", {255, 240, 245, 1}},
    {"lawngreen", {124, 252, 0, 1}},
    {"lemonchiffon", {255, 250, 205, 1}},
    {"lightblue", {173, 216, 230, 1}},
    {"lightcoral", {240, 128, 128, 1}},
    {"lightcyan", {224, 255, 255, 1}},
    {"lightgoldenrodyellow", {250, 250, 210, 1}},
    {"lightgray", {211, 211, 211, 1}},
    {"lightgreen", {144, 238, 144, 1}},
    {"lightgrey", {211, 211, 211, 1}},
    {"lightpink", {255, 182, 193, 1}},
    {"lightsalmon", {255, 160, 122, 1}},
    {"lightseagreen", {32, 178, 170, 1}},
    {"lightskyblue", {135, 206, 250, 1}},
    {"lightslategray", {119, 136, 153, 1}},
    {"lightslategrey", {119, 136, 153, 1}},
    {"lightsteelblue", {176, 196, 222, 1}},
    {"lightyellow", {255, 255, 224, 1}},
    {"lime", {0, 255, 0, 1}},
    {"limegreen", {50, 205, 50, 1}},
    {"linen", {250, 240, 230, 1}},
    {"magenta", {255, 0, 255, 1}},
    {"maroon", {128, 0, 0, 1}},
    {"mediumaquamarine", {102, 205, 170, 1}},
    {"mediumblue", {0, 0, 205, 1}},
    {"mediumorchid", {186, 85, 211, 1}},
    {"mediumpurple", {147, 112, 219, 1}},
    {"mediumseagreen", {60, 179, 113, 1}},
    {"mediumslateblue", {123, 104, 238, 1}},
    {"mediumspringgreen", {0, 250, 154, 1}},
    {"mediumturquoise", {72, 209, 204, 1}},
    {"mediumvioletred", {199, 21, 133, 1}},
    {"midnightblue", {25, 25, 112, 1}},
    {"mintcream", {245, 255, 250, 1}},
    {"mistyrose", {255, 228, 225, 1}},
    {"moccasin", {255, 228, 181, 1}},
    {"navajowhite", {255, 222, 173, 1}},
    {"navy", {0, 0, 128, 1}},
    {"oldlace", {253, 245, 230, 1}},
    {"olive", {128, 128, 0, 1}},
    {"olivedrab", {107, 142, 35, 1}},
    {"orange", {255, 165, 0, 1}},
    {"orangered", {255, 69, 0, 1}},
    {"orchid", {218, 112, 214, 1}},
    {"palegoldenrod", {238, 232, 170, 1}},
    {"palegreen", {152, 251, 152, 1}},
    {"paleturquoise", {175, 238, 238, 1}},
    {"palevioletred", {219, 112, 147, 1}},
    {"papayawhip", {255, 239, 213, 1}},
    {"peachpuff", {255, 218, 185, 1}},
    {"peru", {205, 133, 63, 1}},
    {"pink", {255, 192, 203, 1}},
    {"plum", {221, 160, 221, 1}},
    {"powderblue", {176, 224, 230, 1}},
    {"purple", {128, 0, 128, 1}},
    {"red", {255, 0, 0, 1}},
    {"rosybrown", {188, 143, 143, 1}},
    {"royalblue", {65, 105, 225, 1}},
    {"saddlebrown", {139, 69, 19, 1}},
    {"salmon", {250, 128, 114, 1}},
    {"sandybrown", {244, 164, 96, 1}},
    {"seagreen", {46, 139, 87, 1}},
    {"seashell", {255, 245, 238, 1}},
    {"sienna", {160, 82, 45, 1}},
    {"silver", {192, 192, 192, 1}},
    {"skyblue", {135, 206, 235, 1}},
    {"slateblue", {106, 90, 205, 1}},
    {"slategray", {112, 128, 144, 1}},
    {"slategrey", {112, 128, 144, 1}},
    {"snow", {255, 250, 250, 1}},
    {"springgreen", {0, 255, 127, 1}},
    {"steelblue", {70, 130, 180, 1}},
    {"tan", {210, 180, 140, 1}},
    {"teal", {0, 128, 128, 1}},
    {"thistle", {216, 191, 216, 1}},
    {"tomato", {255, 99, 71, 1}},
    {"turquoise", {64, 224, 208, 1}},
    {"violet", {238, 130, 238, 1}},
    {"wheat", {245, 222, 179, 1}},
    {"white", {255, 255, 255, 1}},
    {"whitesmoke", {245, 245, 245, 1}},
    {"yellow", {255, 255, 0, 1}},
    {"yellowgreen", {154, 205, 50, 1}}};

template <typename T>
uint8_t clampCssByte(T i) {         // Clamp to integer 0 .. 255.
    i = static_cast<T>(::round(i)); // Seems to be what Chrome does (vs truncation).
    return static_cast<uint8_t>(i < 0 ? 0 : i > 255 ? 255
                                                    : i);
}

template <typename T>
float clampCssFloat(T f) { // Clamp to float 0.0 .. 1.0.
    return f < 0 ? 0 : f > 1 ? 1
                             : float(f);
}

float parseFloat(const ccstd::string &str) {
    return strtof(str.c_str(), nullptr);
}

int64_t parseInt(const ccstd::string &str, uint8_t base = 10) {
    return strtoll(str.c_str(), nullptr, base);
}

uint8_t parseCssInt(const ccstd::string &str) { // int or percentage.
    if (str.length() && str.back() == '%') {
        return clampCssByte(parseFloat(str) / 100.0f * 255.0f);
    }
    return clampCssByte(parseInt(str));
}

float parseCssFloat(const ccstd::string &str) { // float or percentage.
    if (str.length() && str.back() == '%') {
        return clampCssFloat(parseFloat(str) / 100.0f);
    }
    return clampCssFloat(parseFloat(str));
}

float cssHueToRgb(float m1, float m2, float h) {
    if (h < 0.0f) {
        h += 1.0f;
    } else if (h > 1.0f) {
        h -= 1.0f;
    }

    if (h * 6.0f < 1.0f) {
        return m1 + (m2 - m1) * h * 6.0f;
    }
    if (h * 2.0f < 1.0f) {
        return m2;
    }
    if (h * 3.0f < 2.0f) {
        return m1 + (m2 - m1) * (2.0f / 3.0f - h) * 6.0f;
    }
    return m1;
}

ccstd::vector<ccstd::string> split(const ccstd::string &s, char delim) {
    ccstd::vector<ccstd::string> elems;
    std::stringstream ss(s);
    ccstd::string item;
    while (std::getline(ss, item, delim)) {
        elems.push_back(item);
    }
    return elems;
}

Color parse(const ccstd::string &cssStr) {
    ccstd::string str = cssStr;

    // Remove all whitespace, not compliant, but should just be more accepting.
    str.erase(std::remove(str.begin(), str.end(), ' '), str.end());

    // Convert to lowercase.
    std::transform(str.begin(), str.end(), str.begin(), ::tolower);

    for (const auto &namedColor : NAMED_COLORS) {
        if (str == namedColor.name) {
            return namedColor.color;
        }
    }

    // #abc and #abc123 syntax.
    if (str.length() && str.front() == '#') {
        if (str.length() == 4) {
            int64_t iv =
                parseInt(str.substr(1), 16); // REFINE(deanm): Stricter parsing.
            if (!(iv >= 0 && iv <= 0xfff)) {
                return {};
            }

            return Color(
                static_cast<uint8_t>(((iv & 0xf00) >> 4) | ((iv & 0xf00) >> 8)),
                static_cast<uint8_t>((iv & 0xf0) | ((iv & 0xf0) >> 4)),
                static_cast<uint8_t>((iv & 0xf) | ((iv & 0xf) << 4)), 1);
        }

        if (str.length() == 7) {
            int64_t iv = parseInt(str.substr(1), 16); // REFINE(deanm): Stricter parsing.
            if (!(iv >= 0 && iv <= 0xffffff)) {
                return {}; // Covers NaN.
            }

            return Color(static_cast<uint8_t>((iv & 0xff0000) >> 16),
                         static_cast<uint8_t>((iv & 0xff00) >> 8),
                         static_cast<uint8_t>(iv & 0xff), 1);
        }

        return Color();
    }

    size_t op = str.find_first_of('(');
    size_t ep = str.find_first_of(')');
    if (op != ccstd::string::npos && ep + 1 == str.length()) {
        const ccstd::string fname = str.substr(0, op);
        const ccstd::vector<ccstd::string> params =
            split(str.substr(op + 1, ep - (op + 1)), ',');

        float alpha = 1.0f;

        if (fname == "rgba" || fname == "rgb") {
            if (fname == "rgba") {
                if (params.size() != 4) {
                    return {};
                }
                alpha = parseCssFloat(params.back());
            } else {
                if (params.size() != 3) {
                    return {};
                }
            }

            return Color(parseCssInt(params[0]), parseCssInt(params[1]),
                         parseCssInt(params[2]), alpha);
        }

        if (fname == "hsla" || fname == "hsl") {
            if (fname == "hsla") {
                if (params.size() != 4) {
                    return {};
                }
                alpha = parseCssFloat(params.back());
            } else {
                if (params.size() != 3) {
                    return {};
                }
            }

            float h = parseFloat(params[0]) / 360.0f;
            while (h < 0.0f) {
                ++h;
            }
            while (h > 1.0f) {
                --h;
            }

            // NOTE(deanm): According to the CSS spec s/l should only be
            // percentages, but we don't bother and let float or percentage.
            float s = parseCssFloat(params[1]);
            float l = parseCssFloat(params[2]);

            float m2 = l <= 0.5f ? l * (s + 1.0f) : l + s - l * s;
            float m1 = l * 2.0f - m2;

            return Color(
                clampCssByte(cssHueToRgb(m1, m2, h + 1.0f / 3.0f) * 255.0f),
                clampCssByte(cssHueToRgb(m1, m2, h) * 255.0f),
                clampCssByte(cssHueToRgb(m1, m2, h - 1.0f / 3.0f) * 255.0f),
                alpha);
        }
    }

    return {};
}

} // namespace CSSColorParser