import { test } from 'node:test';
import assert from 'node:assert/strict';
import { createRequire } from 'node:module';
import { mkdirSync, mkdtempSync, writeFileSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { join, resolve } from 'node:path';
import { spawnSync } from 'node:child_process';

import { acquireWriterLease, writerLockPathFor } from '../packages/core/src/writer-lease.ts';

const require = createRequire(import.meta.url);
const { DatabaseSync } = require('node:sqlite');
const repoRoot = resolve(new URL('..', import.meta.url).pathname);

test('a passive query does not mutate the index while a fresh daemon owns writes', () => {
  const home = mkdtempSync(join(tmpdir(), 'obelisk-daemon-arbitration-'));
  const obeliskDir = join(home, '.obelisk');
  const dbPath = join(obeliskDir, 'obelisk.sqlite');
  mkdirSync(obeliskDir, { recursive: true });

  const db = new DatabaseSync(dbPath);
  db.exec('CREATE TABLE index_state (jsonl_path TEXT PRIMARY KEY, mtime REAL, lines_processed INTEGER)');
  const marker = db.prepare('INSERT INTO index_state (jsonl_path, mtime, lines_processed) VALUES (?, ?, 0)');
  const now = Date.now();
  marker.run('__app_heartbeat__', now);
  db.close();

  const queryPath = join(home, 'query.mjs');
  writeFileSync(queryPath, "return 'read-only';");
  const result = spawnSync(process.execPath, ['packages/core/src/runtime.mjs', '--query', queryPath], {
    cwd: repoRoot,
    env: { ...process.env, HOME: home },
    encoding: 'utf8',
  });
  assert.equal(result.status, 0, result.stderr || result.stdout);
  assert.equal(JSON.parse(result.stdout), 'read-only');

  const check = new DatabaseSync(dbPath, { readOnly: true });
  const tables = check.prepare("SELECT name FROM sqlite_master WHERE type='table' ORDER BY name").all().map(row => row.name);
  check.close();
  assert.deepEqual(tables, ['index_state']);
});

test('attune refuses to mutate the index while a fresh daemon owns writes', () => {
  const home = mkdtempSync(join(tmpdir(), 'obelisk-daemon-attune-'));
  const obeliskDir = join(home, '.obelisk');
  const dbPath = join(obeliskDir, 'obelisk.sqlite');
  mkdirSync(obeliskDir, { recursive: true });
  const db = new DatabaseSync(dbPath);
  db.exec('CREATE TABLE index_state (jsonl_path TEXT PRIMARY KEY, mtime REAL, lines_processed INTEGER)');
  const marker = db.prepare('INSERT INTO index_state (jsonl_path, mtime, lines_processed) VALUES (?, ?, 0)');
  const now = Date.now();
  marker.run('__app_heartbeat__', now);
  db.close();

  const attunePath = join(home, 'attune.mjs');
  writeFileSync(attunePath, 'return true;');
  const result = spawnSync(process.execPath, ['packages/core/src/runtime.mjs', '--attune', attunePath], {
    cwd: repoRoot,
    env: { ...process.env, HOME: home },
    encoding: 'utf8',
  });
  assert.equal(result.status, 1);
  assert.match(JSON.parse(result.stdout).error, /daemon owns index writes/i);

  const check = new DatabaseSync(dbPath, { readOnly: true });
  const tables = check.prepare("SELECT name FROM sqlite_master WHERE type='table' ORDER BY name").all().map(row => row.name);
  check.close();
  assert.deepEqual(tables, ['index_state']);
});

test('a passive query stays read-only when another process holds the writer lease', () => {
  const home = mkdtempSync(join(tmpdir(), 'obelisk-writer-owned-'));
  const obeliskDir = join(home, '.obelisk');
  const dbPath = join(obeliskDir, 'obelisk.sqlite');
  mkdirSync(obeliskDir, { recursive: true });
  const db = new DatabaseSync(dbPath);
  db.exec('CREATE TABLE index_state (jsonl_path TEXT PRIMARY KEY, mtime REAL, lines_processed INTEGER)');
  db.close();

  const lease = acquireWriterLease({
    lockPath: writerLockPathFor(dbPath),
    openDb: path => new DatabaseSync(path),
  });
  assert.ok(lease);
  try {
    const queryPath = join(home, 'query.mjs');
    writeFileSync(queryPath, "return 'writer-busy';");
    const result = spawnSync(process.execPath, ['packages/core/src/runtime.mjs', '--query', queryPath], {
      cwd: repoRoot,
      env: { ...process.env, HOME: home },
      encoding: 'utf8',
    });
    assert.equal(result.status, 0, result.stderr || result.stdout);
    assert.equal(JSON.parse(result.stdout), 'writer-busy');
  } finally {
    lease.release();
  }

  const check = new DatabaseSync(dbPath, { readOnly: true });
  const tables = check.prepare("SELECT name FROM sqlite_master WHERE type='table' ORDER BY name").all().map(row => row.name);
  check.close();
  assert.deepEqual(tables, ['index_state']);
});

test('a passive query fails closed when daemon ownership cannot be read', () => {
  const home = mkdtempSync(join(tmpdir(), 'obelisk-daemon-ownership-error-'));
  const obeliskDir = join(home, '.obelisk');
  const dbPath = join(obeliskDir, 'obelisk.sqlite');
  mkdirSync(obeliskDir, { recursive: true });
  const db = new DatabaseSync(dbPath);
  db.exec('CREATE TABLE index_state (jsonl_path TEXT PRIMARY KEY)');
  db.close();

  const lease = acquireWriterLease({
    lockPath: writerLockPathFor(dbPath),
    openDb: path => new DatabaseSync(path),
  });
  assert.ok(lease);
  try {
    const queryPath = join(home, 'query.mjs');
    writeFileSync(queryPath, "return 'ownership-unknown';");
    const result = spawnSync(process.execPath, ['packages/core/src/runtime.mjs', '--query', queryPath], {
      cwd: repoRoot,
      env: { ...process.env, HOME: home },
      encoding: 'utf8',
    });
    assert.equal(result.status, 1, result.stderr || result.stdout);
    assert.match(JSON.parse(result.stdout).error, /no such column: mtime/i);
  } finally {
    lease.release();
  }
});