let lastTimestamp = -Infinity;
let sequence = 0;
function fillRandomBytes(bytes) {
    if (globalThis.crypto?.getRandomValues) {
        globalThis.crypto.getRandomValues(bytes);
        return;
    }
    for (let i = 0; i < bytes.length; i++) {
        bytes[i] = Math.floor(Math.random() * 256);
    }
}
/** Generate a time-ordered UUIDv7. */
export function uuidv7() {
    const random = new Uint8Array(16);
    fillRandomBytes(random);
    const timestamp = Date.now();
    if (timestamp > lastTimestamp) {
        sequence = random[6] * 0x1000000 + random[7] * 0x10000 + random[8] * 0x100 + random[9];
        lastTimestamp = timestamp;
    }
    else {
        sequence = (sequence + 1) >>> 0;
        if (sequence === 0)
            lastTimestamp++;
    }
    const bytes = new Uint8Array(16);
    bytes[0] = (lastTimestamp / 0x10000000000) & 0xff;
    bytes[1] = (lastTimestamp / 0x100000000) & 0xff;
    bytes[2] = (lastTimestamp / 0x1000000) & 0xff;
    bytes[3] = (lastTimestamp / 0x10000) & 0xff;
    bytes[4] = (lastTimestamp / 0x100) & 0xff;
    bytes[5] = lastTimestamp & 0xff;
    bytes[6] = 0x70 | ((sequence >>> 28) & 0x0f);
    bytes[7] = (sequence >>> 20) & 0xff;
    bytes[8] = 0x80 | ((sequence >>> 14) & 0x3f);
    bytes[9] = (sequence >>> 6) & 0xff;
    bytes[10] = ((sequence & 0x3f) << 2) | (random[10] & 0x03);
    bytes[11] = random[11];
    bytes[12] = random[12];
    bytes[13] = random[13];
    bytes[14] = random[14];
    bytes[15] = random[15];
    const hex = Array.from(bytes, (byte) => byte.toString(16).padStart(2, "0"));
    return `${hex.slice(0, 4).join("")}-${hex.slice(4, 6).join("")}-${hex.slice(6, 8).join("")}-${hex.slice(8, 10).join("")}-${hex.slice(10, 16).join("")}`;
}
//# sourceMappingURL=uuid.js.map