import assert from 'node:assert/strict';
import {createHash} from 'node:crypto';
import {readFileSync, writeFileSync} from 'node:fs';
import {join} from 'node:path';

const root = process.cwd();
const directory = join(root, 'userspace/tests/fixtures');
const source = readFileSync(join(directory, 'core-tools.raw'));
const disk = Buffer.from(source);
const block = 512;
assert.equal(disk.length, 2048 * block);
assert.equal(disk.readUInt32LE(16 * block + 32), 5);
for (const [lba, slot] of [[17, 5], [18, 5], [18, 6], [18, 7],
  [25, 0], [25, 1]]) {
  const at = lba * block + slot * 32;
  assert.ok(disk.subarray(at, at + 32).every(byte => byte === 0),
    `unused fixture slot ${lba}:${slot}`);
}
const entry = (at, id, name) => {
  disk[at] = 1;
  disk[at + 1] = name.length;
  disk.writeUInt32LE(id, at + 4);
  disk.write(name, at + 8, 'ascii');
};
disk.writeUInt32LE(6, 16 * block + 32);
entry(17 * block + 5 * 32, 6, 'SUB');
const sub = 18 * block + 5 * 32;
disk.writeUInt32LE(6, sub);
disk.writeUInt32LE(2, sub + 4);
disk.writeBigUInt64LE(512n, sub + 8);
disk.writeBigUInt64LE(25n, sub + 16);
disk.writeUInt32LE(2, sub + 24);
entry(25 * block, 7, 'INNER');
entry(25 * block + 32, 8, 'HIDDEN');
disk.writeUInt32LE(7, 18 * block + 6 * 32);
disk.writeUInt32LE(8, 18 * block + 7 * 32);
const sha256 = bytes => createHash('sha256').update(bytes).digest('hex');
const image = join(directory, 'core-tools-ls.raw');
const manifest = join(directory, 'core-tools-ls.json');
writeFileSync(image, disk);
writeFileSync(manifest, JSON.stringify({
  schema: 'turkos-k1295-ls-fixture/v1',
  image: 'core-tools-ls.raw', bytes: disk.length, sha256: sha256(disk),
  parent: {image: 'core-tools.raw', sha256: sha256(source)},
  directories: [
    {path: '/', entries: ['README', 'KERNEL', 'MULTI', 'TAIL', 'ONE', 'SUB']},
    {path: '/SUB', entries: ['INNER', 'HIDDEN']},
  ],
  visibility: {hidden: ['HIDDEN'], deniedPaths: ['/SUB']},
}, null, 2) + '\n');
console.log(JSON.stringify({image, manifest, sha256: sha256(disk)}));