// base64url (RFC 4648 §5), no padding — interfaces.md's shared conventions.
// Same implementation as extension/src/base64url.ts; duplicated rather than
// shared across the two independent build targets.

export function base64UrlDecode(s: string): Uint8Array {
    const unpadded = s.replace(/-/g, '+').replace(/_/g, '/');
    const padded = unpadded + '='.repeat((4 - (unpadded.length % 4)) % 4);
    const binary = atob(padded);
    const bytes = new Uint8Array(binary.length);
    for (let i = 0; i < binary.length; i++) {
        bytes[i] = binary.charCodeAt(i);
    }
    return bytes;
}

export function base64UrlEncode(bytes: Uint8Array): string {
    let binary = '';
    for (const byte of bytes) {
        binary += String.fromCharCode(byte);
    }
    return btoa(binary).replace(/\+/g, '-').replace(/\//g, '_').replace(/=+$/, '');
}