/**
 * The SQLite vault store, with persistence as the headline property.
 *
 * This exists because of 2026-08-12: the blob store fell back to memory when
 * its path was unset, worked perfectly, and lost every profile on the next
 * container recreate — with no error anywhere. A backup store that forgets is
 * worse than none, so "survives a close and reopen" is tested directly rather
 * than assumed from the fact that SQLite is involved.
 */
import { describe, test, expect, afterEach } from 'bun:test';
import { unlinkSync } from 'node:fs';
import { join } from 'node:path';
import { tmpdir } from 'node:os';
import { SqliteVaultStore } from '../src/sqlite-vault-store.js';

const paths: string[] = [];
function scratch(name: string): string {
  const p = join(tmpdir(), `shade-vault-${name}-${process.pid}-${Math.random().toString(36).slice(2)}.db`);
  paths.push(p);
  return p;
}

afterEach(() => {
  for (const p of paths.splice(0)) {
    for (const suffix of ['', '-wal', '-shm']) {
      try {
        unlinkSync(p + suffix);
      } catch {
        // Not every WAL sidecar exists; absence is fine.
      }
    }
  }
});

const VAULT = 'a'.repeat(64);
const HASH = 'b'.repeat(64);

describe('persistence', () => {
  test('objects, owner and log survive a close and reopen', async () => {
    const path = scratch('reopen');
    const first = new SqliteVaultStore(path);
    await first.setOwner(VAULT, new Uint8Array([1, 2, 3, 4]));
    await first.putObject(VAULT, HASH, new Uint8Array([9, 8, 7]));
    await first.appendLog(VAULT, { seq: 1, manifest: HASH, at: 1700, bytes: 3 });
    first.close();

    const second = new SqliteVaultStore(path);
    expect(await second.getOwner(VAULT)).toEqual(new Uint8Array([1, 2, 3, 4]));
    expect(await second.getObject(VAULT, HASH)).toEqual(new Uint8Array([9, 8, 7]));
    expect(await second.head(VAULT)).toBe(1);
    expect((await second.log(VAULT))[0]!.manifest).toBe(HASH);
    second.close();
  });

  test('binary content round-trips without base64 mangling', async () => {
    // Objects are ciphertext: every byte value occurs, including 0x00.
    const path = scratch('binary');
    const store = new SqliteVaultStore(path);
    const bytes = new Uint8Array(256);
    for (let i = 0; i < 256; i++) bytes[i] = i;
    await store.putObject(VAULT, HASH, bytes);
    store.close();

    const reopened = new SqliteVaultStore(path);
    expect(await reopened.getObject(VAULT, HASH)).toEqual(bytes);
    reopened.close();
  });
});

describe('semantics', () => {
  test('an empty vault has head 0 and no owner', async () => {
    const store = new SqliteVaultStore(scratch('empty'));
    expect(await store.head(VAULT)).toBe(0);
    expect(await store.getOwner(VAULT)).toBeNull();
    expect(await store.log(VAULT)).toEqual([]);
    expect(await store.usage(VAULT)).toBe(0);
    store.close();
  });

  test('re-putting the same hash is a no-op, not a duplicate', async () => {
    // The name IS the content hash, so a repeat is the same bytes by
    // definition. Usage must not double.
    const store = new SqliteVaultStore(scratch('dupe'));
    await store.putObject(VAULT, HASH, new Uint8Array(100));
    await store.putObject(VAULT, HASH, new Uint8Array(100));
    expect(await store.usage(VAULT)).toBe(100);
    store.close();
  });

  test('vaults are isolated from each other', async () => {
    const store = new SqliteVaultStore(scratch('isolated'));
    const other = 'c'.repeat(64);
    await store.putObject(VAULT, HASH, new Uint8Array([1]));
    expect(await store.hasObject(other, HASH)).toBe(false);
    expect(await store.getObject(other, HASH)).toBeNull();
    expect(await store.usage(other)).toBe(0);
    store.close();
  });

  test('the log is ordered oldest-first and limit counts back from the head', async () => {
    const store = new SqliteVaultStore(scratch('log'));
    for (let seq = 1; seq <= 5; seq++) {
      await store.appendLog(VAULT, { seq, manifest: `${seq}`.repeat(64), at: seq, bytes: seq });
    }
    expect((await store.log(VAULT)).map((e) => e.seq)).toEqual([1, 2, 3, 4, 5]);
    // A client asking for the last two wants 4 and 5, still in order.
    expect((await store.log(VAULT, 2)).map((e) => e.seq)).toEqual([4, 5]);
    expect(await store.head(VAULT)).toBe(5);
    store.close();
  });

  test('a duplicate seq is rejected by the primary key', async () => {
    // The route layer refuses this first, but the store is the last line:
    // two rows with the same seq would make history ambiguous.
    const store = new SqliteVaultStore(scratch('seq'));
    await store.appendLog(VAULT, { seq: 1, manifest: HASH, at: 1, bytes: 1 });
    expect(store.appendLog(VAULT, { seq: 1, manifest: HASH, at: 2, bytes: 1 })).rejects.toThrow();
    store.close();
  });
});