/**
 * v0.4.1 测试 — AriaEngine 外键级联 + clearAll 重置
 */

import { AriaEngine } from '../src/engine/aria/index';

import { installOPFSMock } from './helpers/opfs-mock';

beforeEach(() => { installOPFSMock(new Map()); });

const mkEngine = async (name: string): Promise<AriaEngine> => {
  const e = new AriaEngine({ storageBackend: 'opfs', walSyncMode: 'full' });
  await e.open(`cascade-${name}-${Date.now()}-${Math.random().toString(36).slice(2, 8)}`, 1);
  return e;
};

describe('[v0.4.1] AriaEngine 外键级联', () => {
  test('CASCADE：删除主表行时级联删除引用行', async () => {
    const e = await mkEngine('cas');
    await e.createTable({ name: 'users', columns: { id: { type: 'string', primaryKey: true } } });
    await e.createTable({ name: 'orders', columns: { id: { type: 'string', primaryKey: true }, user_id: { type: 'string', references: 'users.id', onDelete: 'CASCADE' } } });
    await e.insert('users', [{ id: 'u1' }, { id: 'u2' }]);
    await e.insert('orders', [{ id: 'o1', user_id: 'u1' }, { id: 'o2', user_id: 'u1' }, { id: 'o3', user_id: 'u2' }]);

    const count = await e.delete('users', { table: 'users', where: { id: 'u1' } });
    expect(count).toBe(3); // u1 + o1 + o2
    expect(await e.count('users')).toBe(1);
    expect(await e.count('orders')).toBe(1);
    const rest = await e.find('orders', { table: 'orders' });
    expect(rest[0].user_id).toBe('u2');
    await e.close();
  });

  test('CASCADE：多层递归（users → orders → order_items）', async () => {
    const e = await mkEngine('cas2');
    await e.createTable({ name: 'users', columns: { id: { type: 'string', primaryKey: true } } });
    await e.createTable({ name: 'orders', columns: { id: { type: 'string', primaryKey: true }, user_id: { type: 'string', references: 'users.id', onDelete: 'CASCADE' } } });
    await e.createTable({ name: 'order_items', columns: { id: { type: 'string', primaryKey: true }, order_id: { type: 'string', references: 'orders.id', onDelete: 'CASCADE' } } });
    await e.insert('users', [{ id: 'u1' }]);
    await e.insert('orders', [{ id: 'o1', user_id: 'u1' }]);
    await e.insert('order_items', [{ id: 'i1', order_id: 'o1' }, { id: 'i2', order_id: 'o1' }]);

    const count = await e.delete('users', { table: 'users', where: { id: 'u1' } });
    expect(count).toBe(4); // u1 + o1 + i1 + i2
    expect(await e.count('order_items')).toBe(0);
    await e.close();
  });

  test('SET NULL：删除主表行时引用列置 null', async () => {
    const e = await mkEngine('sn');
    await e.createTable({ name: 'users', columns: { id: { type: 'string', primaryKey: true } } });
    await e.createTable({ name: 'orders', columns: { id: { type: 'string', primaryKey: true }, user_id: { type: 'string', references: 'users.id', onDelete: 'SET NULL' } } });
    await e.insert('users', [{ id: 'u1' }]);
    await e.insert('orders', [{ id: 'o1', user_id: 'u1' }]);

    const count = await e.delete('users', { table: 'users', where: { id: 'u1' } });
    expect(count).toBe(1); // 仅 u1，引用行保留
    const rows = await e.find('orders', { table: 'orders' });
    expect(rows).toHaveLength(1);
    expect(rows[0].user_id).toBeNull();
    await e.close();
  });

  test('RESTRICT：存在引用行时禁止删除', async () => {
    const e = await mkEngine('res');
    await e.createTable({ name: 'users', columns: { id: { type: 'string', primaryKey: true } } });
    await e.createTable({ name: 'orders', columns: { id: { type: 'string', primaryKey: true }, user_id: { type: 'string', references: 'users.id', onDelete: 'RESTRICT' } } });
    await e.insert('users', [{ id: 'u1' }]);
    await e.insert('orders', [{ id: 'o1', user_id: 'u1' }]);

    await expect(e.delete('users', { table: 'users', where: { id: 'u1' } })).rejects.toThrow('Cannot delete');
    // 数据未被删除
    expect(await e.count('users')).toBe(1);
    expect(await e.count('orders')).toBe(1);
    await e.close();
  });

  test('CASCADE 同时清理二级索引（删除后按索引查不到）', async () => {
    const e = await mkEngine('cidx');
    await e.createTable({ name: 'users', columns: { id: { type: 'string', primaryKey: true } } });
    await e.createTable({ name: 'orders', columns: { id: { type: 'string', primaryKey: true }, user_id: { type: 'string', index: true, references: 'users.id', onDelete: 'CASCADE' } } });
    await e.insert('users', [{ id: 'u1' }]);
    await e.insert('orders', [{ id: 'o1', user_id: 'u1' }]);
    await e.delete('users', { table: 'users', where: { id: 'u1' } });
    const rows = await e.find('orders', { table: 'orders', where: { user_id: 'u1' } });
    expect(rows).toHaveLength(0);
    await e.close();
  });

  test('事务内级联删除可提交/回滚', async () => {
    const e = await mkEngine('ctx');
    await e.createTable({ name: 'users', columns: { id: { type: 'string', primaryKey: true } } });
    await e.createTable({ name: 'orders', columns: { id: { type: 'string', primaryKey: true }, user_id: { type: 'string', references: 'users.id', onDelete: 'CASCADE' } } });
    await e.insert('users', [{ id: 'u1' }]);
    await e.insert('orders', [{ id: 'o1', user_id: 'u1' }]);

    // rollback：级联删除被回滚
    await e.beginTransaction();
    await e.delete('users', { table: 'users', where: { id: 'u1' } });
    await e.rollbackTransaction();
    expect(await e.count('users')).toBe(1);
    expect(await e.count('orders')).toBe(1);

    // commit：级联删除生效
    await e.beginTransaction();
    await e.delete('users', { table: 'users', where: { id: 'u1' } });
    await e.commitTransaction();
    expect(await e.count('users')).toBe(0);
    expect(await e.count('orders')).toBe(0);
    await e.close();
  });
});

describe('[v0.4.1] AriaEngine clearAll', () => {
  test('clearAll 清空全部表与数据，实例可继续使用', async () => {
    const e = await mkEngine('clr');
    await e.createTable({ name: 'users', columns: { id: { type: 'string', primaryKey: true }, name: { type: 'string', index: true } } });
    await e.insert('users', [{ id: '1', name: 'Alice' }]);

    await e.clearAll();
    expect(await e.getTableNames()).toHaveLength(0);

    // 实例可继续建表使用
    await e.createTable({ name: 't2', columns: { id: { type: 'string', primaryKey: true } } });
    await e.insert('t2', [{ id: 'x' }]);
    expect(await e.count('t2')).toBe(1);
    await e.close();
  });

  test('clearAll 后重启（模拟刷新）无残留数据', async () => {
    const name = `clr2-${Date.now()}-${Math.random().toString(36).slice(2, 8)}`;
    let e = new AriaEngine({ storageBackend: 'opfs', walSyncMode: 'full' });
    await e.open(name, 1);
    await e.createTable({ name: 't', columns: { id: { type: 'string', primaryKey: true } } });
    await e.insert('t', [{ id: '1' }]);
    await e.clearAll();
    await e.close();

    // 重新打开（模拟页面刷新）：不应有残留表
    e = new AriaEngine({ storageBackend: 'opfs', walSyncMode: 'full' });
    await e.open(name, 1);
    expect(await e.getTableNames()).toHaveLength(0);
    await e.close();
  });
});

describe('[v0.4.1] AriaEngine ALTER TABLE', () => {
  test('DROP COLUMN 真正清除存储中的列值（find 副本不再残留）', async () => {
    const e = await mkEngine('alt');
    await e.createTable({ name: 'users', columns: { id: { type: 'string', primaryKey: true }, name: { type: 'string' }, email: { type: 'string' }, age: { type: 'number', default: 0 } } });
    await e.insert('users', [{ id: '1', name: 'Alice', email: 'a@x.com', age: 30 }]);
    await e.alterTable('users', 'ADD', { name: 'phone', type: 'string' });
    await e.insert('users', [{ id: '2', name: 'Frank', age: 33, phone: '123' }]);
    await e.alterTable('users', 'DROP', { name: 'phone', type: 'string' });

    const rows = await e.find('users', { table: 'users' });
    for (const row of rows) {
      expect('phone' in row).toBe(false);
    }
    await e.close();
  });

  test('ALTER 持久化：重启后 schema 与行一致', async () => {
    const name = `alt2-${Date.now()}-${Math.random().toString(36).slice(2, 8)}`;
    let e = new AriaEngine({ storageBackend: 'opfs', walSyncMode: 'full' });
    await e.open(name, 1);
    await e.createTable({ name: 'users', columns: { id: { type: 'string', primaryKey: true }, name: { type: 'string' } } });
    await e.insert('users', [{ id: '1', name: 'Alice' }]);
    await e.alterTable('users', 'ADD', { name: 'phone', type: 'string' });
    await e.insert('users', [{ id: '2', name: 'Frank', phone: '123' }]);
    await e.alterTable('users', 'DROP', { name: 'phone', type: 'string' });
    await e.close();

    e = new AriaEngine({ storageBackend: 'opfs', walSyncMode: 'full' });
    await e.open(name, 1);
    const schema = await e.getTableSchema('users');
    expect(Object.keys(schema!.columns)).not.toContain('phone');
    const rows = await e.find('users', { table: 'users' });
    for (const row of rows) expect('phone' in row).toBe(false);
    await e.close();
  });

  test('ALTER 模拟崩溃（不 close）重启：schema 与行一致', async () => {
    const name = `alt3-${Date.now()}-${Math.random().toString(36).slice(2, 8)}`;
    let e = new AriaEngine({ storageBackend: 'opfs', walSyncMode: 'full' });
    await e.open(name, 1);
    await e.createTable({ name: 'users', columns: { id: { type: 'string', primaryKey: true }, name: { type: 'string' } } });
    await e.insert('users', [{ id: '1', name: 'Alice' }]);
    await e.alterTable('users', 'ADD', { name: 'phone', type: 'string' });
    await e.insert('users', [{ id: '2', name: 'Frank', phone: '123' }]);
    await e.alterTable('users', 'DROP', { name: 'phone', type: 'string' });
    // 不 close，模拟崩溃

    e = new AriaEngine({ storageBackend: 'opfs', walSyncMode: 'full' });
    await e.open(name, 1);
    const schema = await e.getTableSchema('users');
    expect(Object.keys(schema!.columns)).not.toContain('phone');
    const rows = await e.find('users', { table: 'users' });
    for (const row of rows) expect('phone' in row).toBe(false);
    await e.close();
  });
});