export class ElColorHelper {
    static shade(color, weight) {
        return ElColorHelper.mix('#000000', color, weight);
    }
    static tint(color, weight) {
        return ElColorHelper.mix('#ffffff', color, weight);
    }
    static mix(color1, color2, weight) {
        const d2h = (d) => d.toString(16);
        const h2d = (h) => parseInt(h, 16);
        let result = '#';
        for (let i = 1; i < 7; i += 2) {
            const firstPart = h2d(color1.substr(i, 2));
            const secondPart = h2d(color2.substr(i, 2));
            const resultPart = d2h(Math.floor(secondPart + (firstPart - secondPart) * (weight / 100.0)));
            result += ('0' + resultPart).slice(-2);
        }
        return result;
    }
    static hexToRgbA(hex, alpha) {
        let c;
        if (/^#([A-Fa-f0-9]{3}){1,2}$/.test(hex)) {
            c = hex.substring(1).split('');
            if (c.length === 3) {
                c = [c[0], c[0], c[1], c[1], c[2], c[2]];
            }
            c = '0x' + c.join('');
            return 'rgba(' + [(c >> 16) & 255, (c >> 8) & 255, c & 255].join(',') + ',' + alpha + ')';
        }
        throw new Error('Bad Hex');
    }
}
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