/**
 * @param {string} ratio z.B "10:9", "   9:8  "
 * @return {[number, number]} represents ration width vs height
 * */
export function parseRatio(ratio = "10:9") {
    const validInputPattern = /^(\d+)(:|\s+)(\d+)$/g;
    const separator = /:|\s+/;
    const cleanupInput = ratio.trim();
    if ( validInputPattern.test(cleanupInput) ) {
        const r = cleanupInput.split(separator);
        return [Number.parseInt(r[0]), Number.parseInt(r[1])];
    } else {
        throw new RangeError("[tv-size] Seitenverhältnis ist nicht gültig")
    }
}

/**
 * @return {number} diagonal
 * */
export function parseDiagonal (diagonal="") {
    const cleanupDiagonal = diagonal.trim().replaceAll(",", ".");
    const validPattern = /^(\d+)(\.(\d)*)*$/g;
    if (validPattern.test(cleanupDiagonal)) {
        const d = Number.parseFloat(cleanupDiagonal) ;
        if(d > 0) {
            return d;
        }
    }
    throw new RangeError("[tv-size] Ungültige Diagonal");
}

/**
 * @return {[number, number]} [width, height]
 * */
export function calculateTvSize(ratio, diagonal) {
    const r = ratio[0] / ratio[1];
    const h = diagonal / (Math.sqrt(r*r + 1));
    const b = r*h;
    return [b,h];
}

export function formatTvSize(width, height) {
    return [width.toFixed(2).replace(".", ","), height.toFixed(2).replace(".", ",")];
}