/*!
 * KoliBri - The accessible HTML-Standard
 */
import { hex } from "wcag-contrast";
import rgba from "color-rgba";
import rgbaConvert from "rgba-convert";
export const getContrastYIQ = (r, g, b) => {
    const yiq = (r * 299 + g * 587 + b * 114) / 1000;
    return yiq >= 128 ? -1 : 1;
};
export const calcColorContrast = (baseColor, contrastColor, ratio, dir = 1) => {
    const color = [
        Math.max(Math.min(Math.round(contrastColor[0] + dir * Math.max(1, contrastColor[0] / 100)), 255), 0),
        Math.max(Math.min(Math.round(contrastColor[1] + dir * Math.max(1, contrastColor[1] / 100)), 255), 0),
        Math.max(Math.min(Math.round(contrastColor[2] + dir * Math.max(1, contrastColor[2] / 100)), 255), 0),
    ];
    const contrast = hex(rgbaConvert.hex(`rgba(${baseColor.join(',')},1)`), rgbaConvert.hex(`rgba(${color.join(',')},1)`));
    const summe = color[0] + color[1] + color[2];
    if (summe === 0 || summe === 765 || contrast > ratio) {
        return {
            background: baseColor,
            foreground: color,
            contrast,
        };
    }
    else {
        return calcColorContrast(baseColor, color, ratio, dir);
    }
};
const cache = new Map();
export const getColorContrast = (baseColor, contrastColor, ratio, dir = 1) => {
    if (cache.has(baseColor)) {
        return cache.get(baseColor);
    }
    const color = calcColorContrast(baseColor, contrastColor, ratio, dir);
    cache.set(baseColor, color);
    return color;
};
export const createContrastColorPair = (color, contrastRatio = 7) => {
    let baseColor = [0, 0, 0, 1];
    let contrastColor = [255, 255, 255, 1];
    if (typeof color === 'string') {
        baseColor = rgba(color);
        contrastColor = baseColor;
    }
    else if (typeof color === 'object' && color !== null && typeof color.background === 'string' && typeof color.foreground === 'string') {
        baseColor = rgba(color.background);
        if (typeof color.foreground === 'string') {
            contrastColor = rgba(color.foreground);
        }
        else {
            contrastColor = baseColor;
        }
    }
    const yiq = getContrastYIQ(baseColor[0], baseColor[1], baseColor[2]);
    const colorContrast = getColorContrast([baseColor[0], baseColor[1], baseColor[2]], [contrastColor[0], contrastColor[1], contrastColor[2]], contrastRatio, yiq);
    contrastColor = [...colorContrast.foreground, 1];
    return {
        background: rgbaConvert.hex(`rgba(${baseColor.join(',')})`),
        foreground: rgbaConvert.hex(`rgba(${contrastColor.join(',')})`),
        contrast: colorContrast.contrast,
    };
};
//# sourceMappingURL=contrast.js.map
