/**
 * v0.1.13 外键级联测试
 * 覆盖 ON DELETE CASCADE / SET NULL / RESTRICT
 */

import { MetonaSqlark } from '../src/core';
import { parse } from '../src/sql/parser';

// ===================================================================
//  SQL Parser 外键语法
// ===================================================================

describe('v0.1.13 外键级联 — Parser', () => {
  it('REFERENCES 语法解析', () => {
    const stmt = parse(`CREATE TABLE orders (
      id STRING PRIMARY KEY,
      user_id STRING REFERENCES users(id)
    )`);
    expect(stmt.type).toBe('CREATE_TABLE');
    if (stmt.type === 'CREATE_TABLE') {
      const col = stmt.columns.find((c) => c.name === 'user_id');
      expect(col).toBeTruthy();
      expect(col!.references).toBe('users.id');
    }
  });

  it('REFERENCES + ON DELETE CASCADE', () => {
    const stmt = parse(`CREATE TABLE orders (
      id STRING PRIMARY KEY,
      user_id STRING REFERENCES users(id) ON DELETE CASCADE
    )`);
    if (stmt.type === 'CREATE_TABLE') {
      const col = stmt.columns.find((c) => c.name === 'user_id');
      expect(col!.onDelete).toBe('CASCADE');
    }
  });

  it('REFERENCES + ON DELETE SET NULL', () => {
    const stmt = parse(`CREATE TABLE orders (
      id STRING PRIMARY KEY,
      user_id STRING REFERENCES users(id) ON DELETE SET NULL
    )`);
    if (stmt.type === 'CREATE_TABLE') {
      const col = stmt.columns.find((c) => c.name === 'user_id');
      expect(col!.onDelete).toBe('SET NULL');
    }
  });

  it('REFERENCES + ON UPDATE CASCADE', () => {
    const stmt = parse(`CREATE TABLE orders (
      id STRING PRIMARY KEY,
      user_id STRING REFERENCES users(id) ON UPDATE CASCADE
    )`);
    if (stmt.type === 'CREATE_TABLE') {
      const col = stmt.columns.find((c) => c.name === 'user_id');
      expect(col!.onUpdate).toBe('CASCADE');
    }
  });

  it('REFERENCES + 同时 ON DELETE 和 ON UPDATE', () => {
    const stmt = parse(`CREATE TABLE orders (
      id STRING PRIMARY KEY,
      user_id STRING REFERENCES users(id) ON DELETE CASCADE ON UPDATE RESTRICT
    )`);
    if (stmt.type === 'CREATE_TABLE') {
      const col = stmt.columns.find((c) => c.name === 'user_id');
      expect(col!.onDelete).toBe('CASCADE');
      expect(col!.onUpdate).toBe('RESTRICT');
    }
  });
});

// ===================================================================
//  ON DELETE CASCADE 执行
// ===================================================================

describe('v0.1.13 外键级联 — ON DELETE CASCADE', () => {
  let db: MetonaSqlark;

  beforeEach(async () => {
    db = new MetonaSqlark({ name: 'fk-cascade-test', mode: 'memory' });
    await db.init();
    await db.defineTable('users', {
      id: { type: 'string', primaryKey: true },
      name: { type: 'string', required: true },
    });
    await db.defineTable('orders', {
      id: { type: 'string', primaryKey: true },
      user_id: { type: 'string', references: 'users.id', onDelete: 'CASCADE' },
      amount: { type: 'number' },
    });

    await db.table('users').insertMany([
      { id: '1', name: 'Alice' },
      { id: '2', name: 'Bob' },
    ]);
    await db.table('orders').insertMany([
      { id: 'o1', user_id: '1', amount: 100 },
      { id: 'o2', user_id: '1', amount: 200 },
      { id: 'o3', user_id: '2', amount: 50 },
    ]);
  });

  afterEach(async () => { await db.close(); });

  it('删除用户 → 级联删除其订单', async () => {
    // 删除 Alice
    await db.table('users').delete().where({ id: '1' }).execute();

    // Alice 被删除
    expect(await db.table('users').count()).toBe(1);
    // Alice 的订单也被删除
    const orders = await db.table('orders').select().execute();
    expect(orders).toHaveLength(1);
    expect(orders[0].user_id).toBe('2');
  });

  it('删除没有订单的用户 → 不会级联删除', async () => {
    // 先查总数
    const userCount = await db.table('users').count();
    const orderCount = await db.table('orders').count();

    // 删除一个没有任何订单的用户（创建临时用户）
    await db.table('users').insert({ id: '3', name: 'Eve' });
    await db.table('users').delete().where({ id: '3' }).execute();

    // 订单应该不变
    expect(await db.table('orders').count()).toBe(orderCount);
  });

  it('SQL DELETE 触发级联', async () => {
    await db.query("DELETE FROM users WHERE id = '2'");
    const orders = await db.table('orders').select().execute();
    expect(orders).toHaveLength(2); // 只剩 Alice 的 2 个订单
    for (const o of orders) {
      expect(o.user_id).toBe('1');
    }
  });
});

// ===================================================================
//  ON DELETE SET NULL
// ===================================================================

describe('v0.1.13 外键级联 — ON DELETE SET NULL', () => {
  let db: MetonaSqlark;

  beforeEach(async () => {
    db = new MetonaSqlark({ name: 'fk-setnull-test', mode: 'memory' });
    await db.init();
    await db.defineTable('users', {
      id: { type: 'string', primaryKey: true },
      name: { type: 'string', required: true },
    });
    await db.defineTable('orders', {
      id: { type: 'string', primaryKey: true },
      user_id: { type: 'string', references: 'users.id', onDelete: 'SET NULL' },
      amount: { type: 'number' },
    });

    await db.table('users').insert({ id: '1', name: 'Alice' });
    await db.table('orders').insert({ id: 'o1', user_id: '1', amount: 100 });
  });

  afterEach(async () => { await db.close(); });

  it('删除用户 → 订单 user_id 设为 NULL', async () => {
    await db.table('users').delete().where({ id: '1' }).execute();
    const orders = await db.table('orders').select().execute();
    expect(orders).toHaveLength(1);
    expect(orders[0].user_id).toBeNull();
  });
});

// ===================================================================
//  ON DELETE RESTRICT
// ===================================================================

describe('v0.1.13 外键级联 — ON DELETE RESTRICT', () => {
  let db: MetonaSqlark;

  beforeEach(async () => {
    db = new MetonaSqlark({ name: 'fk-restrict-test', mode: 'memory' });
    await db.init();
    await db.defineTable('users', {
      id: { type: 'string', primaryKey: true },
      name: { type: 'string', required: true },
    });
    await db.defineTable('orders', {
      id: { type: 'string', primaryKey: true },
      user_id: { type: 'string', references: 'users.id', onDelete: 'RESTRICT' },
      amount: { type: 'number' },
    });

    await db.table('users').insert({ id: '1', name: 'Alice' });
    await db.table('orders').insert({ id: 'o1', user_id: '1', amount: 100 });
  });

  afterEach(async () => { await db.close(); });

  it('RESTRICT 模式下删除用户 → 不级联（保留孤儿订单）', async () => {
    await db.table('users').delete().where({ id: '1' }).execute();
    // 订单仍然存在
    const orders = await db.table('orders').select().execute();
    expect(orders).toHaveLength(1);
    expect(orders[0].user_id).toBe('1');
  });

  it('无 references 的列不受影响', async () => {
    await db.table('users').delete().where({ id: '1' }).execute();
    expect(await db.table('orders').count()).toBe(1);
  });
});