/**
 * Executor + Builder + Memory 边缘覆盖测试
 */
import { MetonaSqlark } from '../src/core';
import { MemoryEngine } from '../src/engine/memory';
import { SelectQueryBuilder } from '../src/query/builder';
import { createSchema } from '../src/table/schema';

describe('边缘覆盖', () => {
  let db: MetonaSqlark;

  beforeEach(async () => {
    db = new MetonaSqlark({ name: 'test-edge', mode: 'memory' });
    await db.init();
    await db.defineTable('users', {
      id: { type: 'string', primaryKey: true },
      name: { type: 'string', required: true },
      age: { type: 'number' },
      active: { type: 'boolean', default: true },
    });
    await db.table('users').insertMany([
      { id: '1', name: 'Alice', age: 30, active: true },
      { id: '2', name: 'Bob', age: 25, active: true },
      { id: '3', name: 'Charlie', age: 35, active: false },
      { id: '4', name: 'Diana', age: 30, active: true },
    ]);
  });

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

  // ---- DISTINCT ----
  describe('DISTINCT', () => {
    it('SELECT DISTINCT 去重', async () => {
      const result = await db.query('SELECT DISTINCT age FROM users ORDER BY age') as Record<string, unknown>[];
      expect(result).toHaveLength(3); // 30,25,35
    });

    it('DISTINCT with WHERE', async () => {
      const result = await db.query("SELECT DISTINCT age FROM users WHERE active = TRUE") as Record<string, unknown>[];
      expect(result).toHaveLength(2); // 30,25
    });
  });

  // ---- $and / $or / $not ----
  describe('复杂 Where 条件', () => {
    it('$and 条件 (MemoryEngine 直接)', async () => {
      // $and 在 MemoryEngine 的 matchWhere 中解析
      const engine = new MemoryEngine();
      await engine.open('test', 1);
      await engine.createTable(createSchema('users', {
        id: { type: 'string', primaryKey: true }, age: { type: 'number' }, active: { type: 'boolean' },
      }));
      await engine.insert('users', [
        { id: '1', age: 30, active: true },
        { id: '2', age: 25, active: true },
        { id: '3', age: 30, active: false },
      ]);
      const rows = await engine.find('users', {
        table: 'users',
        where: { $and: [{ age: 30 }, { active: true }] } as any,
      });
      expect(rows).toHaveLength(1);
      await engine.close();
    });

    it('$or 条件 (MemoryEngine 直接)', async () => {
      const engine = new MemoryEngine();
      await engine.open('test2', 1);
      await engine.createTable(createSchema('users', {
        id: { type: 'string', primaryKey: true }, name: { type: 'string' },
      }));
      await engine.insert('users', [
        { id: '1', name: 'Alice' }, { id: '2', name: 'Bob' }, { id: '3', name: 'Charlie' },
      ]);
      const rows = await engine.find('users', {
        table: 'users',
        where: { $or: [{ name: 'Alice' }, { name: 'Bob' }] } as any,
      });
      expect(rows).toHaveLength(2);
      await engine.close();
    });

    it('$not 条件', async () => {
      const rows = await db.table('users').select().where({
        name: { $not: { $eq: 'Alice' } } as any,
      }).execute();
      expect(rows).toHaveLength(3);
    });

    it('$in + $nin', async () => {
      const r1 = await db.table('users').select().where({ age: { $in: [25, 35] } }).execute();
      expect(r1).toHaveLength(2);
      const r2 = await db.table('users').select().where({ age: { $nin: [30] } }).execute();
      expect(r2).toHaveLength(2);
    });

    it('$lt + $lte', async () => {
      const r = await db.table('users').select().where({ age: { $lt: 30 } }).execute();
      expect(r).toHaveLength(1); // Bob(25)
      const r2 = await db.table('users').select().where({ age: { $lte: 30 } }).execute();
      expect(r2).toHaveLength(3); // Alice+Diana(30)+Bob(25)
    });
  });

  // ---- QueryBuilder 全覆盖 ----
  describe('QueryBuilder 全覆盖', () => {
    let engine: MemoryEngine;
    beforeEach(async () => {
      engine = new MemoryEngine();
      await engine.open('test', 1);
      await engine.createTable(createSchema('users', {
        id: { type: 'string', primaryKey: true },
        name: { type: 'string', required: true },
      }));
      await engine.insert('users', [{ id: '1', name: 'Alice' }, { id: '2', name: 'Bob' }]);
    });
    afterEach(async () => { await engine.close(); });

    it('SelectQueryBuilder.as 别名', () => {
      const qb = new SelectQueryBuilder(engine, 'users').as('u');
      expect(qb.toAST().alias).toBe('u');
    });

    it('rightJoin', () => {
      const qb = new SelectQueryBuilder(engine, 'users');
      qb.rightJoin('orders', { 'users.id': { $col: 'orders.user_id' } }, 'o');
      expect(qb.toAST().joins![0].type).toBe('RIGHT');
    });

    it('join 默认为 INNER', () => {
      const qb = new SelectQueryBuilder(engine, 'users');
      qb.join('orders', { 'users.id': { $col: 'orders.user_id' } });
      expect(qb.toAST().joins![0].type).toBe('INNER');
    });
  });

  // ---- RIGHT JOIN SQL ----
  describe('RIGHT JOIN', () => {
    beforeEach(async () => {
      await db.defineTable('departments', {
        id: { type: 'number', primaryKey: true },
        name: { type: 'string' },
      });
      await db.table('departments').insertMany([
        { id: 1, name: 'Eng' }, { id: 2, name: 'Sales' },
      ]);
      await db.defineTable('emp', {
        id: { type: 'string', primaryKey: true },
        name: { type: 'string' },
        dept_id: { type: 'number' },
      });
      await db.table('emp').insert({ id: '1', name: 'Alice', dept_id: 1 });
    });

    it('RIGHT JOIN 保留右表无匹配行', async () => {
      const result = await db.query(
        'SELECT emp.name, departments.name FROM emp RIGHT JOIN departments ON emp.dept_id = departments.id',
      ) as Record<string, unknown>[];
      expect(result.length).toBeGreaterThanOrEqual(2);
    });
  });

  // ---- MemoryEngine 索引 ----
  describe('MemoryEngine 索引查找', () => {
    it('索引列 $eq 查询', async () => {
      // age 列标记为 index
      await db.defineTable('indexed_users', {
        id: { type: 'string', primaryKey: true },
        name: { type: 'string' },
        score: { type: 'number', index: true },
      });
      await db.table('indexed_users').insertMany([
        { id: '1', name: 'A', score: 100 },
        { id: '2', name: 'B', score: 200 },
        { id: '3', name: 'C', score: 100 },
      ]);
      // $eq 查询应使用索引
      const rows = await db.table('indexed_users').select().where({ score: 100 }).execute();
      expect(rows).toHaveLength(2);
    });

    it('唯一索引列查询', async () => {
      await db.defineTable('unique_users', {
        id: { type: 'string', primaryKey: true },
        email: { type: 'string', unique: true },
      });
      await db.table('unique_users').insertMany([
        { id: '1', email: 'a@t.com' },
        { id: '2', email: 'b@t.com' },
      ]);
      const rows = await db.table('unique_users').select().where({ email: 'a@t.com' }).execute();
      expect(rows).toHaveLength(1);
    });
  });

  // ---- GROUP BY 边缘 ----
  describe('GROUP BY 边缘', () => {
    it('单个 GROUP BY 列', async () => {
      const result = await db.query('SELECT active, COUNT(*) FROM users GROUP BY active') as Record<string, unknown>[];
      expect(result).toHaveLength(2);
    });

    it('AVG 空值处理 (GROUP BY)', async () => {
      await db.defineTable('scores', { id: { type: 'string', primaryKey: true }, dept: { type: 'string' }, val: { type: 'number' } });
      await db.table('scores').insertMany([{ id: '1', dept: 'A', val: 100 }, { id: '2', dept: 'A', val: 200 }]);
      const result = await db.query('SELECT dept, AVG(val) FROM scores GROUP BY dept') as Record<string, unknown>[];
      expect(result[0]['AVG(val)']).toBe(150);
    });
  });
});