import assert from 'node:assert/strict';
import { readFile } from 'node:fs/promises';
import { dirname, resolve } from 'node:path';
import { fileURLToPath } from 'node:url';
import { loadConfig } from '../dist/config.js';
import { closeMySqlPool, createMySqlPool } from '../dist/db/mysql.js';
import { LegacyReadRepository } from '../dist/db/legacy-read-repository.js';
import { TaskRepository } from '../dist/tasks/task-repository.js';
import {
  executeMigrationPlan,
  loadMigrationPlan,
  splitSqlStatements
} from '../dist/db/migration-runner.js';

const expectedTables = [
  'qipai_async_tasks',
  'qipai_audit_logs',
  'qipai_devices',
  'qipai_legacy_table_mappings',
  'qipai_members',
  'qipai_orders',
  'qipai_outbox_events',
  'qipai_payments',
  'qipai_rooms',
  'qipai_schema_migrations',
  'qipai_stores',
  'qipai_tenants'
];
const repoRoot = resolve(dirname(fileURLToPath(import.meta.url)), '../..');

async function readCoreTables(pool) {
  const placeholders = expectedTables.map(() => '?').join(', ');
  const [rows] = await pool.query(
    `SELECT table_name AS tableName
     FROM information_schema.tables
     WHERE table_schema = DATABASE()
       AND table_name IN (${placeholders})
     ORDER BY table_name`,
    expectedTables
  );
  return rows.map((row) => row.tableName);
}

async function readMigrationVersions(pool) {
  const [rows] = await pool.query(
    `SELECT version, name
     FROM qipai_schema_migrations
     WHERE version IN (?, ?)
     ORDER BY version`,
    ['2026061601', '2026061802']
  );
  return rows;
}

async function loadLegacyFixture(pool) {
  const fixtureSql = await readFile(
    resolve(repoRoot, 'database/fixtures/2026061801_m01b_legacy_schema.sql'),
    'utf8'
  );
  const statements = splitSqlStatements(fixtureSql);
  for (const statement of statements) {
    await pool.query(statement);
  }
  return statements.length;
}

async function assertLegacyCompatibility(pool) {
  const repository = new LegacyReadRepository(pool);
  const stores = await repository.listStores({ tenantId: 1 });
  const rooms = await repository.listRooms({ tenantId: 1, parentId: 101 });
  const orders = await repository.listOrders({ tenantId: 1, parentId: 1001 });
  const devices = await repository.listDevices({ tenantId: 1, parentId: 1001 });

  assert.deepEqual(stores.map((record) => record.legacyId), [101]);
  assert.deepEqual(rooms.map((record) => record.legacyId), [1001, 1002]);
  assert.deepEqual(devices.map((record) => record.code), ['SANITIZED-DEVICE-001']);
  assert.equal(orders.length, 1);
  assert.equal(orders[0].code, 'LEGACY-SANITIZED-001');
  assert.equal(orders[0].totalAmountCents, 2580);
  assert.equal(orders[0].paidAmountCents, 2000);
  assert.equal(orders[0].renewalAmountCents, 580);
  assert.equal(orders[0].groupAmountCents, 0);
  assert.equal(orders[0].refundAmountCents, null);
}

async function assertTaskDurability(pool) {
  await pool.query(
    `INSERT INTO qipai_tenants (code, name)
     VALUES ('M01C-TEST', 'M01C sanitized test tenant')`
  );
  const firstRepository = new TaskRepository(pool);
  const firstEnqueue = await firstRepository.enqueue({
    tenantId: '1',
    taskType: 'order.advance',
    idempotencyKey: 'order:501:paid',
    payload: { orderId: '501' },
    maxAttempts: 3
  });
  const duplicateEnqueue = await firstRepository.enqueue({
    tenantId: '1',
    taskType: 'order.advance',
    idempotencyKey: 'order:501:paid',
    payload: { orderId: '501' },
    maxAttempts: 3
  });
  assert.equal(firstEnqueue.created, true);
  assert.equal(duplicateEnqueue.created, false);
  assert.equal(duplicateEnqueue.id, firstEnqueue.id);

  const restartedRepository = new TaskRepository(pool);
  const claimed = await restartedRepository.claimNext('worker-after-restart', 30_000);
  assert.equal(claimed?.id, firstEnqueue.id);
  assert.equal(claimed?.attempts, 1);
  assert.equal(await restartedRepository.complete(claimed.id, 'worker-after-restart'), true);

  const [rows] = await pool.query(
    `SELECT status, attempts FROM qipai_async_tasks WHERE id = ?`,
    [firstEnqueue.id]
  );
  assert.deepEqual(rows, [{ status: 'SUCCEEDED', attempts: 1 }]);
}

const config = loadConfig();
assert.equal(config.mysql.passwordConfigured, true, 'Live migration test requires a temporary password.');
assert.match(
  config.mysql.database,
  /^qipai_m01c_test_[a-z0-9_]+$/,
  'Live migration test refuses to use a non-temporary database.'
);

const plans = {
  up: await loadMigrationPlan('up'),
  verify: await loadMigrationPlan('verify'),
  down: await loadMigrationPlan('down')
};
const pool = createMySqlPool(config);

try {
  const legacyFixtureStatements = await loadLegacyFixture(pool);
  await assertLegacyCompatibility(pool);
  console.log('PASS: sanitized legacy fixture is readable before migration.');

  await executeMigrationPlan(pool, plans.up);
  await executeMigrationPlan(pool, plans.verify);
  assert.deepEqual(await readCoreTables(pool), expectedTables);
  assert.deepEqual(await readMigrationVersions(pool), [
    { version: '2026061601', name: 'm01b_core_schema' },
    { version: '2026061802', name: 'm01c_async_tasks' }
  ]);
  await assertTaskDurability(pool);
  await assertLegacyCompatibility(pool);
  console.log('PASS: first up, verify and durable task restart check completed.');

  await executeMigrationPlan(pool, plans.down);
  assert.deepEqual(await readCoreTables(pool), []);
  await assertLegacyCompatibility(pool);
  console.log('PASS: down removed all M01-B/M01-C tables.');

  await executeMigrationPlan(pool, plans.up);
  await executeMigrationPlan(pool, plans.verify);
  assert.deepEqual(await readCoreTables(pool), expectedTables);
  assert.deepEqual(await readMigrationVersions(pool), [
    { version: '2026061601', name: 'm01b_core_schema' },
    { version: '2026061802', name: 'm01c_async_tasks' }
  ]);
  await assertLegacyCompatibility(pool);
  console.log('PASS: second up and verify restored the schema.');

  console.log(JSON.stringify({
    mysqlHost: config.mysql.host,
    databaseClass: 'temporary',
    sequence: ['up', 'verify', 'down', 'up', 'verify'],
    checksums: {
      up: plans.up.checksum,
      verify: plans.verify.checksum,
      down: plans.down.checksum
    },
    statementCounts: {
      up: plans.up.statements.length,
      verify: plans.verify.statements.length,
      down: plans.down.statements.length
    },
    legacyFixtureStatements,
    legacyCompatibilityChecks: [
      'stores',
      'rooms',
      'orders',
      'devices',
      'tenant isolation',
      'decimal cents'
    ]
  }, null, 2));
} finally {
  await closeMySqlPool(pool);
}