import { Buffer } from 'node:buffer';
import { createHash, generateKeyPairSync, sign } from 'node:crypto';

export function signedFixture(bytes) {
    const { publicKey, privateKey } = generateKeyPairSync('ed25519');
    const keyId = Buffer.alloc(8, 7);
    const key = Buffer.concat([
        Buffer.from('Ed'),
        keyId,
        publicKey.export({ type: 'spki', format: 'der' }).subarray(-32),
    ]);
    const signature = sign(
        null,
        createHash('blake2b512').update(bytes).digest(),
        privateKey,
    );
    const trusted = 'timestamp:123456';
    const globalSignature = sign(
        null,
        Buffer.concat([signature, Buffer.from(trusted)]),
        privateKey,
    );
    return {
        publicKey: Buffer.from(
            `untrusted comment: test\n${key.toString('base64')}\n`,
        ).toString('base64'),
        signature: Buffer.from(
            `untrusted comment: test\n${Buffer.concat([Buffer.from('ED'), keyId, signature]).toString('base64')}\ntrusted comment: ${trusted}\n${globalSignature.toString('base64')}\n`,
        ).toString('base64'),
    };
}