/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
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** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
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** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
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****************************************************************************/

#include "qglobal.h"
#include "qrgb.h"
#include "qstringlist.h"

#include <algorithm>

QT_BEGIN_NAMESPACE

static inline int h2i(char hex)
{
    if (hex >= '0' && hex <= '9')
        return hex - '0';
    if (hex >= 'a' && hex <= 'f')
        return hex - 'a' + 10;
    if (hex >= 'A' && hex <= 'F')
        return hex - 'A' + 10;
    return -1;
}

static inline int hex2int(const char *s)
{
    return (h2i(s[0]) << 4) | h2i(s[1]);
}

static inline int hex2int(char s)
{
    int h = h2i(s);
    return (h << 4) | h;
}

bool qt_get_hex_rgb(const char *name, QRgb *rgb)
{
    if(name[0] != '#')
        return false;
    name++;
    int len = qstrlen(name);
    int a, r, g, b;
    a = 255;
    if (len == 12) {
        r = hex2int(name);
        g = hex2int(name + 4);
        b = hex2int(name + 8);
    } else if (len == 9) {
        r = hex2int(name);
        g = hex2int(name + 3);
        b = hex2int(name + 6);
    } else if (len == 8) {
        a = hex2int(name);
        r = hex2int(name + 2);
        g = hex2int(name + 4);
        b = hex2int(name + 6);
    } else if (len == 6) {
        r = hex2int(name);
        g = hex2int(name + 2);
        b = hex2int(name + 4);
    } else if (len == 3) {
        r = hex2int(name[0]);
        g = hex2int(name[1]);
        b = hex2int(name[2]);
    } else {
        r = g = b = -1;
    }
    if ((uint)r > 255 || (uint)g > 255 || (uint)b > 255 || (uint)a > 255) {
        *rgb = 0;
        return false;
    }
    *rgb = qRgba(r, g ,b, a);
    return true;
}

bool qt_get_hex_rgb(const QChar *str, int len, QRgb *rgb)
{
    if (len > 13)
        return false;
    char tmp[16];
    for(int i = 0; i < len; ++i)
        tmp[i] = str[i].toLatin1();
    tmp[len] = 0;
    return qt_get_hex_rgb(tmp, rgb);
}

#ifndef QT_NO_COLORNAMES

/*
  CSS color names = SVG 1.0 color names + transparent (rgba(0,0,0,0))
*/

#ifdef rgb
#  undef rgb
#endif
#define rgb(r,g,b) (0xff000000 | (r << 16) |  (g << 8) | b)

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

static const int rgbTblSize = sizeof(rgbTbl) / sizeof(RGBData);

#undef rgb

#if defined(Q_CC_MSVC) && _MSC_VER < 1600
inline bool operator<(const RGBData &data1, const RGBData &data2)
{ return qstrcmp(data1.name, data2.name) < 0; }
#endif

inline bool operator<(const char *name, const RGBData &data)
{ return qstrcmp(name, data.name) < 0; }
inline bool operator<(const RGBData &data, const char *name)
{ return qstrcmp(data.name, name) < 0; }

static bool get_named_rgb(const char *name_no_space, QRgb *rgb)
{
    const RGBData *r = std::lower_bound(rgbTbl, rgbTbl + rgbTblSize, name_no_space);
    if ((r != rgbTbl + rgbTblSize) && !(name_no_space < *r)) {
        *rgb = r->value;
        return true;
    }
    return false;
}

bool qt_get_named_rgb(const char *name, QRgb* rgb)
{
    int len = int(strlen(name));
    if(len > 255)
        return false;
    char name_no_space[256];
    int pos = 0;
    for(int i = 0; i < len; i++) {
        if(name[i] != '\t' && name[i] != ' ')
            name_no_space[pos++] = QChar::toLower(name[i]);
    }
    name_no_space[pos] = 0;

    return get_named_rgb(name_no_space, rgb);
}

bool qt_get_named_rgb(const QChar *name, int len, QRgb *rgb)
{
    if(len > 255)
        return false;
    char name_no_space[256];
    int pos = 0;
    for(int i = 0; i < len; i++) {
        if(name[i] != QLatin1Char('\t') && name[i] != QLatin1Char(' '))
            name_no_space[pos++] = name[i].toLower().toLatin1();
    }
    name_no_space[pos] = 0;
    return get_named_rgb(name_no_space, rgb);
}


uint qt_get_rgb_val(const char *name)
{
    QRgb r = 0;
    qt_get_named_rgb(name,&r);
    return r;
}

QStringList qt_get_colornames()
{
    int i = 0;
    QStringList lst;
    lst.reserve(rgbTblSize);
    for (i = 0; i < rgbTblSize; i++)
        lst << QLatin1String(rgbTbl[i].name);
    return lst;
}

#else

bool qt_get_named_rgb(const char *, QRgb*)
{
    return false;
}

uint qt_get_rgb_val(const char *)
{
    return 0;
}
QStringList qt_get_colornames()
{
    return QStringList();
}
#endif // QT_NO_COLORNAMES

QT_END_NAMESPACE