function hexToRgb(hex) {
    const normalized = hex.startsWith("#") ? hex.slice(1) : hex;
    const r = parseInt(normalized.slice(0, 2), 16);
    const g = parseInt(normalized.slice(2, 4), 16);
    const b = parseInt(normalized.slice(4, 6), 16);
    return { r, g, b };
}
function parseOscHexChannel(channel) {
    if (!/^[0-9a-f]+$/i.test(channel)) {
        return undefined;
    }
    const max = 16 ** channel.length - 1;
    if (max <= 0) {
        return undefined;
    }
    return Math.round((parseInt(channel, 16) / max) * 255);
}
const OSC11_BACKGROUND_COLOR_RESPONSE_PATTERN = /^\x1b\]11;([^\x07\x1b]*)(?:\x07|\x1b\\)$/i;
export function isOsc11BackgroundColorResponse(data) {
    return OSC11_BACKGROUND_COLOR_RESPONSE_PATTERN.test(data);
}
export function parseOsc11BackgroundColor(data) {
    const match = data.match(OSC11_BACKGROUND_COLOR_RESPONSE_PATTERN);
    if (!match) {
        return undefined;
    }
    const value = match[1].trim();
    if (value.startsWith("#")) {
        const hex = value.slice(1);
        if (/^[0-9a-f]{6}$/i.test(hex)) {
            return hexToRgb(value);
        }
        if (/^[0-9a-f]{12}$/i.test(hex)) {
            const r = parseOscHexChannel(hex.slice(0, 4));
            const g = parseOscHexChannel(hex.slice(4, 8));
            const b = parseOscHexChannel(hex.slice(8, 12));
            return r !== undefined && g !== undefined && b !== undefined ? { r, g, b } : undefined;
        }
        return undefined;
    }
    const rgbValue = value.replace(/^rgba?:/i, "");
    const [red, green, blue] = rgbValue.split("/");
    if (red === undefined || green === undefined || blue === undefined) {
        return undefined;
    }
    const r = parseOscHexChannel(red);
    const g = parseOscHexChannel(green);
    const b = parseOscHexChannel(blue);
    return r !== undefined && g !== undefined && b !== undefined ? { r, g, b } : undefined;
}
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