/**
 * Object storing multiple named colors.
 * 
 * Example:
 * {
 *     primary: 'red',
 *     secondary: '#ff0000',
 * }
 */
interface ColorMap {
    [key: string]: string;
}

/**
 * List of supported colors.
 */
const COLORS: ColorMap = {
    'aliceblue': '#f0f8ff',
    'antiquewhite': '#faebd7',
    'aqua': '#00ffff',
    'aquamarine': '#7fffd4',
    'azure': '#f0ffff',
    'beige': '#f5f5dc',
    'bisque': '#ffe4c4',
    'black': '#000000',
    'blanchedalmond': '#ffebcd',
    'blue': '#0000ff',
    'blueviolet': '#8a2be2',
    'brown': '#a52a2a',
    'burlywood': '#deb887',
    'cadetblue': '#5f9ea0',
    'chartreuse': '#7fff00',
    'chocolate': '#d2691e',
    'coral': '#ff7f50',
    'cornflowerblue': '#6495ed',
    'cornsilk': '#fff8dc',
    'crimson': '#dc143c',
    'cyan': '#00ffff',
    'darkblue': '#00008b',
    'darkcyan': '#008b8b',
    'darkgoldenrod': '#b8860b',
    'darkgray': '#a9a9a9',
    'darkgreen': '#006400',
    'darkkhaki': '#bdb76b',
    'darkmagenta': '#8b008b',
    'darkolivegreen': '#556b2f',
    'darkorange': '#ff8c00',
    'darkorchid': '#9932cc',
    'darkred': '#8b0000',
    'darksalmon': '#e9967a',
    'darkseagreen': '#8fbc8f',
    'darkslateblue': '#483d8b',
    'darkslategray': '#2f4f4f',
    'darkturquoise': '#00ced1',
    'darkviolet': '#9400d3',
    'deeppink': '#ff1493',
    'deepskyblue': '#00bfff',
    'dimgray': '#696969',
    'dodgerblue': '#1e90ff',
    'firebrick': '#b22222',
    'floralwhite': '#fffaf0',
    'forestgreen': '#228b22',
    'fuchsia': '#ff00ff',
    'gainsboro': '#dcdcdc',
    'ghostwhite': '#f8f8ff',
    'gold': '#ffd700',
    'goldenrod': '#daa520',
    'gray': '#808080',
    'green': '#008000',
    'greenyellow': '#adff2f',
    'honeydew': '#f0fff0',
    'hotpink': '#ff69b4',
    'indianred ': '#cd5c5c',
    'indigo': '#4b0082',
    'ivory': '#fffff0',
    'khaki': '#f0e68c',
    'lavender': '#e6e6fa',
    'lavenderblush': '#fff0f5',
    'lawngreen': '#7cfc00',
    'lemonchiffon': '#fffacd',
    'lightblue': '#add8e6',
    'lightcoral': '#f08080',
    'lightcyan': '#e0ffff',
    'lightgoldenrodyellow': '#fafad2',
    'lightgrey': '#d3d3d3',
    'lightgreen': '#90ee90',
    'lightpink': '#ffb6c1',
    'lightsalmon': '#ffa07a',
    'lightseagreen': '#20b2aa',
    'lightskyblue': '#87cefa',
    'lightslategray': '#778899',
    'lightsteelblue': '#b0c4de',
    'lightyellow': '#ffffe0',
    'lime': '#00ff00',
    'limegreen': '#32cd32',
    'linen': '#faf0e6',
    'magenta': '#ff00ff',
    'maroon': '#800000',
    'mediumaquamarine': '#66cdaa',
    'mediumblue': '#0000cd',
    'mediumorchid': '#ba55d3',
    'mediumpurple': '#9370d8',
    'mediumseagreen': '#3cb371',
    'mediumslateblue': '#7b68ee',
    'mediumspringgreen': '#00fa9a',
    'mediumturquoise': '#48d1cc',
    'mediumvioletred': '#c71585',
    'midnightblue': '#191970',
    'mintcream': '#f5fffa',
    'mistyrose': '#ffe4e1',
    'moccasin': '#ffe4b5',
    'navajowhite': '#ffdead',
    'navy': '#000080',
    'oldlace': '#fdf5e6',
    'olive': '#808000',
    'olivedrab': '#6b8e23',
    'orange': '#ffa500',
    'orangered': '#ff4500',
    'orchid': '#da70d6',
    'palegoldenrod': '#eee8aa',
    'palegreen': '#98fb98',
    'paleturquoise': '#afeeee',
    'palevioletred': '#d87093',
    'papayawhip': '#ffefd5',
    'peachpuff': '#ffdab9',
    'peru': '#cd853f',
    'pink': '#ffc0cb',
    'plum': '#dda0dd',
    'powderblue': '#b0e0e6',
    'purple': '#800080',
    'rebeccapurple': '#663399',
    'red': '#ff0000',
    'rosybrown': '#bc8f8f',
    'royalblue': '#4169e1',
    'saddlebrown': '#8b4513',
    'salmon': '#fa8072',
    'sandybrown': '#f4a460',
    'seagreen': '#2e8b57',
    'seashell': '#fff5ee',
    'sienna': '#a0522d',
    'silver': '#c0c0c0',
    'skyblue': '#87ceeb',
    'slateblue': '#6a5acd',
    'slategray': '#708090',
    'snow': '#fffafa',
    'springgreen': '#00ff7f',
    'steelblue': '#4682b4',
    'tan': '#d2b48c',
    'teal': '#008080',
    'thistle': '#d8bfd8',
    'tomato': '#ff6347',
    'turquoise': '#40e0d0',
    'violet': '#ee82ee',
    'wheat': '#f5deb3',
    'white': '#ffffff',
    'whitesmoke': '#f5f5f5',
    'yellow': '#ffff00',
    'yellowgreen': '#9acd32'
};

/**
 * Returns a hexadecimal color string for a given color name or hex code.
 *
 * Example:
 * ```js
 * parseColor('red'); // "#ff0000"
 * parseColor('#0f0'); // "#00ff00"
 * ```
 *
 * @param colorName Color name (e.g., "red") or hex string (e.g., "#ff0000" or "#0f0").
 * @returns Hexadecimal color string in the format "#rrggbb".
 */
export function parseColor(colorName: string): string {
    if (colorName.startsWith('#')) {
        if (colorName.length === 4) {
            // support shorthand
            return `#${colorName[1]}${colorName[1]}${colorName[2]}${colorName[2]}${colorName[3]}${colorName[3]}`;
        } else {
            return colorName;
        }
    } else {
        return COLORS[colorName.toLowerCase()] || '#000000';
    }
}

/**
 * Parses a colors attribute string into a ColorMap object.
 *
 * Example:
 * ```js
 * parseColors('primary:red,secondary:#00ff00');
 * // Returns: { primary: '#ff0000', secondary: '#00ff00' }
 * ```
 *
 * @param colors Colors defined as a comma-separated string (e.g., "primary:red,secondary:#00ff00").
 * @returns Object mapping color names to hex strings, or undefined if input is invalid.
 */
export function parseColors(colors: any): ColorMap | undefined {
    if (!colors || typeof colors !== 'string') {
        return undefined;
    }

    const list = colors.split(',').filter(c => c).map(c => c.split(':')).filter(c => c.length == 2);

    return list.reduce<ColorMap>((p, c) => {
        const a = c[0];
        p[a.toLowerCase()] = parseColor(c[1]);
        return p;
    }, {});
}

/**
 * Parses a stroke attribute value to a supported numeric range.
 *
 * @param value Stroke value as a string or number ("light", 1, "1", "regular", 2, "2", "bold", 3, "3").
 * @returns Stroke value as 1, 2, or 3, or undefined if not valid.
 */
export function parseStroke(value: any): (1 | 2 | 3 | undefined) {
    if (value === 'light' || value === 1 || value === '1') {
        return 1;
    } else if (value === 'regular' || value === 2 || value === '2') {
        return 2;
    } else if (value === 'bold' || value === 3 || value === '3') {
        return 3;
    }

    return undefined;
}

/**
 * Parse state attribute.
 * @param value State value.
 * @returns Returns the state as a string if valid, otherwise undefined.
 */
export function parseState(value: any): (string | undefined) {
    if (typeof value === 'string') {
        return value;
    }

    return undefined;
}