/**
 * IndexedDBEngine 完整测试（使用 fake-indexeddb）
 * 每次测试使用独立的数据库名避免版本冲突
 */

import 'fake-indexeddb/auto';
import { IndexedDBEngine } from '../../src/engine/indexeddb';
import { createSchema } from '../../src/table/schema';

let dbCounter = 0;

describe('IndexedDBEngine', () => {
  let engine: IndexedDBEngine;
  let dbName: string;

  const userSchema = createSchema('users', {
    id: { type: 'string', primaryKey: true },
    name: { type: 'string', required: true },
    age: { type: 'number', default: 0 },
    email: { type: 'string', unique: true },
  });

  beforeEach(async () => {
    dbName = `test-idb-${++dbCounter}`;
    engine = new IndexedDBEngine();
    await engine.open(dbName, 1);
  });

  afterEach(async () => {
    if (engine.isOpen()) {
      await engine.close();
    }
    // 清理：删除 IndexedDB 数据库
    try {
      indexedDB.deleteDatabase(dbName);
    } catch {}
  });

  // ---- 生命周期 ----

  describe('生命周期', () => {
    it('打开和关闭', async () => {
      expect(engine.isOpen()).toBe(true);
      await engine.close();
      expect(engine.isOpen()).toBe(false);
    });

    it('未打开时操作抛出错误', async () => {
      await engine.close();
      await expect(engine.count('users')).rejects.toThrow('not opened');
    });

    it('可以重新打开', async () => {
      await engine.close();
      await engine.open(dbName, 2);
      expect(engine.isOpen()).toBe(true);
    });
  });

  // ---- 表管理 ----

  describe('表管理', () => {
    it('创建和删除表', async () => {
      await engine.createTable(userSchema);
      expect(await engine.hasTable('users')).toBe(true);

      await engine.dropTable('users');
      expect(await engine.hasTable('users')).toBe(false);
    });

    it('表名列表', async () => {
      await engine.createTable(userSchema);
      const names = await engine.getTableNames();
      expect(names).toContain('users');
    });

    it('获取表结构', async () => {
      await engine.createTable(userSchema);
      const schema = await engine.getTableSchema('users');
      expect(schema).not.toBeNull();
      expect(schema!.name).toBe('users');
    });

    it('获取不存在的表结构返回 null', async () => {
      const schema = await engine.getTableSchema('nonexistent');
      expect(schema).toBeNull();
    });
  });

  // ---- 插入 ----

  describe('插入', () => {
    beforeEach(async () => {
      await engine.createTable(userSchema);
    });

    it('插入单行', async () => {
      const pks = await engine.insert('users', [
        { id: '1', name: 'Alice', age: 30, email: 'alice@test.com' },
      ]);
      expect(pks).toEqual(['1']);
      expect(await engine.count('users')).toBe(1);
    });

    it('插入多行', async () => {
      await engine.insert('users', [
        { id: '1', name: 'Alice', age: 30, email: 'a@t.com' },
        { id: '2', name: 'Bob', age: 25, email: 'b@t.com' },
      ]);
      expect(await engine.count('users')).toBe(2);
    });

    it('必填字段缺失抛出错误', async () => {
      await expect(
        engine.insert('users', [{ id: '1', email: 'a@t.com' }]),
      ).rejects.toThrow('required');
    });
  });

  // ---- 查询 ----

  describe('查询', () => {
    beforeEach(async () => {
      await engine.createTable(userSchema);
      await engine.insert('users', [
        { id: '1', name: 'Alice', age: 30, email: 'alice@test.com' },
        { id: '2', name: 'Bob', age: 25, email: 'bob@test.com' },
        { id: '3', name: 'Charlie', age: 35, email: 'charlie@test.com' },
      ]);
    });

    it('查询所有', async () => {
      const rows = await engine.find('users', { table: 'users' });
      expect(rows).toHaveLength(3);
    });

    it('WHERE 条件', async () => {
      const rows = await engine.find('users', {
        table: 'users',
        where: { age: { $gt: 28 } },
      });
      expect(rows).toHaveLength(2);
    });

    it('ORDER BY + LIMIT', async () => {
      const rows = await engine.find('users', {
        table: 'users',
        orderBy: [{ column: 'age', direction: 'desc' }],
        limit: 2,
      });
      expect(rows.map(r => r.age)).toEqual([35, 30]);
    });

    it('列选择', async () => {
      const rows = await engine.find('users', {
        table: 'users',
        columns: ['id'],
        where: { id: '1' },
      });
      expect(Object.keys(rows[0])).toEqual(['id']);
    });
  });

  // ---- 更新 ----

  describe('更新', () => {
    beforeEach(async () => {
      await engine.createTable(userSchema);
      await engine.insert('users', [
        { id: '1', name: 'Alice', age: 30, email: 'a@t.com' },
        { id: '2', name: 'Bob', age: 25, email: 'b@t.com' },
      ]);
    });

    it('更新匹配行', async () => {
      const count = await engine.update(
        'users',
        { table: 'users', where: { id: '1' } },
        { age: 31 },
      );
      expect(count).toBe(1);
      const rows = await engine.find('users', { table: 'users', where: { id: '1' } });
      expect(rows[0].age).toBe(31);
    });

    it('更新所有行', async () => {
      const count = await engine.update(
        'users',
        { table: 'users' },
        { age: 100 },
      );
      expect(count).toBe(2);
    });
  });

  // ---- 删除 ----

  describe('删除', () => {
    beforeEach(async () => {
      await engine.createTable(userSchema);
      await engine.insert('users', [
        { id: '1', name: 'Alice', age: 30, email: 'a@t.com' },
        { id: '2', name: 'Bob', age: 25, email: 'b@t.com' },
      ]);
    });

    it('条件删除', async () => {
      const count = await engine.delete('users', {
        table: 'users',
        where: { id: '1' },
      });
      expect(count).toBe(1);
      expect(await engine.count('users')).toBe(1);
    });

    it('清空表', async () => {
      await engine.clear('users');
      expect(await engine.count('users')).toBe(0);
      // 表结构仍存在
      expect(await engine.hasTable('users')).toBe(true);
    });

    it('删除不存在的表抛出错误', async () => {
      await expect(
        engine.delete('nonexistent', { table: 'nonexistent' }),
      ).rejects.toThrow();
    });
  });

  // ---- Count ----

  describe('Count', () => {
    beforeEach(async () => {
      await engine.createTable(userSchema);
      await engine.insert('users', [
        { id: '1', name: 'Alice', age: 30, email: 'a@t.com' },
        { id: '2', name: 'Bob', age: 25, email: 'b@t.com' },
      ]);
    });

    it('count 全部', async () => {
      expect(await engine.count('users')).toBe(2);
    });

    it('count with where', async () => {
      expect(await engine.count('users', {
        table: 'users',
        where: { age: { $gt: 28 } },
      })).toBe(1);
    });
  });

  // ---- 复杂 Where 条件 ----

  describe('复杂 Where', () => {
    beforeEach(async () => {
      await engine.createTable(userSchema);
      await engine.insert('users', [
        { id: '1', name: 'Alice', age: 30, email: 'a@t.com' },
        { id: '2', name: 'Bob', age: 25, email: 'b@t.com' },
        { id: '3', name: 'Charlie', age: 35, email: 'c@t.com' },
      ]);
    });

    it('$like 模糊匹配', async () => {
      const rows = await engine.find('users', {
        table: 'users',
        where: { name: { $like: 'A%' } },
      });
      expect(rows).toHaveLength(1);
    });

    it('$in 列表', async () => {
      const rows = await engine.find('users', {
        table: 'users',
        where: { id: { $in: ['1', '3'] } },
      });
      expect(rows).toHaveLength(2);
    });

    it('$ne 不等于', async () => {
      const rows = await engine.find('users', {
        table: 'users',
        where: { age: { $ne: 25 } },
      });
      expect(rows).toHaveLength(2);
    });

    it('$gte $lte 范围', async () => {
      const rows = await engine.find('users', {
        table: 'users',
        where: { age: { $gte: 25, $lte: 30 } },
      });
      expect(rows).toHaveLength(2);
    });
  });

  // ---- 并发/多次操作 ----

  describe('多次操作', () => {
    it('连续创建删除表', async () => {
      await engine.createTable(userSchema);
      expect(await engine.hasTable('users')).toBe(true);
      await engine.dropTable('users');
      expect(await engine.hasTable('users')).toBe(false);
      await engine.createTable(userSchema);
      expect(await engine.hasTable('users')).toBe(true);
    });

    it('插入后查询再更新再查询', async () => {
      await engine.createTable(userSchema);
      await engine.insert('users', [
        { id: '1', name: 'Alice', age: 30, email: 'a@t.com' },
      ]);
      let rows = await engine.find('users', { table: 'users' });
      expect(rows[0].age).toBe(30);

      await engine.update('users', { table: 'users' }, { age: 31 });
      rows = await engine.find('users', { table: 'users' });
      expect(rows[0].age).toBe(31);
    });
  });
});