export function clamp01(value) {
    return Math.min(1, Math.max(0, value));
}

export function clamp255(value) {
    return Math.min(255, Math.max(0, value));
}

export function rgbToHsl(r, g, b) {
    r /= 255;
    g /= 255;
    b /= 255;
    const max = Math.max(r, g, b);
    const min = Math.min(r, g, b);
    let h;
    let s;
    const l = (max + min) / 2;
    if (max === min) {
        h = 0;
        s = 0;
    } 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;
            default:
                h = (r - g) / d + 4;
        }
        h /= 6;
    }
    return { h, s, l };
}

export function hslToRgb(h, s, l) {
    let r;
    let g;
    let b;
    if (s === 0) {
        r = g = b = l;
    } else {
        const 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 {
        r: Math.round(r * 255),
        g: Math.round(g * 255),
        b: Math.round(b * 255)
    };
}

export function hueDistance(a, b) {
    let diff = Math.abs(a - b);
    diff = Math.min(diff, 1 - diff);
    return diff;
}
