/**
 * v0.2.5 修复验证测试
 * 验证所有 P0/P1/P2 修复点
 */

import { VERSION } from '../src/constants';
import { MetonaSqlark } from '../src/core';
import { AriaEngine } from '../src/engine/aria/index';
import { MemoryEngine } from '../src/engine/memory';
import { parse } from '../src/sql/parser';
import { QueryExecutor } from '../src/query/executor';
import { WAL } from '../src/engine/aria/wal/log';
import { SSTableReader } from '../src/engine/aria/index/sstable';
import { BloomFilter } from '../src/engine/aria/index/bloom';
import { CryptoManager } from '../src/engine/aria/crypto';
import { PluginManager } from '../src/plugin/index';
import type { SSTableMeta } from '../src/engine/aria/types';
import type { MetonaPlugin } from '../src/constants';
import { createSchema } from '../src/table/schema';

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

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

// ---------------------------------------------------------------------------
// P0-1: 版本号统一
// ---------------------------------------------------------------------------

describe('[v0.2.5] P0-1: 版本号统一', () => {
  test('VERSION 常量为当前版本（0.6.0）', () => {
    expect(VERSION).toBe('0.7.3');
  });
});

// ---------------------------------------------------------------------------
// P0-2: AriaEngine OPFS 后端映射修复
// ---------------------------------------------------------------------------

describe('[v0.2.5] P0-2: AriaEngine OPFS 后端映射', () => {
  test('mode=aria + diskEngine=opfs 时应使用 opfs 后端', () => {
    const db = new MetonaSqlark({ name: `test-opfs-map-${Date.now()}-${Math.random().toString(36).slice(2, 8)}`, mode: 'aria', diskEngine: 'opfs' });
    // 不实际 open（需要浏览器环境），只验证 createEngine 逻辑
    // 通过 getEngine 在 init 后检查
    expect(db).toBeDefined();
  });

  test('mode=aria + diskEngine=indexeddb 时应使用 indexeddb 后端', () => {
    const db = new MetonaSqlark({ name: `test-idb-map-${Date.now()}-${Math.random().toString(36).slice(2, 8)}`, mode: 'aria', diskEngine: 'opfs' });
    expect(db).toBeDefined();
  });
});

// ---------------------------------------------------------------------------
// P0-3: _onError 接入执行路径
// ---------------------------------------------------------------------------

describe('[v0.2.5] P0-3: _onError 接入执行路径', () => {
  test('query 失败时调用 onError 回调', async () => {
    const errors: Error[] = [];
    const db = new MetonaSqlark({
      name: 'test-onerror',
      mode: 'memory',
      onError: (e) => errors.push(e),
    });
    await db.init();
    await db.defineTable('users', {
      id: { type: 'string', primaryKey: true },
      name: { type: 'string' },
    });

    // 故意执行不存在的表查询
    await expect(db.query('SELECT * FROM nonexistent')).rejects.toThrow();
    expect(errors.length).toBeGreaterThan(0);
    await db.close();
  });

  test('defineTable 失败时调用 onError', async () => {
    const errors: Error[] = [];
    const db = new MetonaSqlark({
      name: 'test-onerror2',
      mode: 'memory',
      onError: (e) => errors.push(e),
    });
    await db.init();
    await db.defineTable('dup', {
      id: { type: 'string', primaryKey: true },
    });
    // 重复创建
    await expect(db.defineTable('dup', {
      id: { type: 'string', primaryKey: true },
    })).rejects.toThrow();
    expect(errors.length).toBeGreaterThan(0);
    await db.close();
  });
});

// ---------------------------------------------------------------------------
// P0-4: maxRowsPerQuery 生效
// ---------------------------------------------------------------------------

describe('[v0.2.5] P0-4: maxRowsPerQuery 生效', () => {
  test('结果集被截断为 maxRowsPerQuery', async () => {
    const engine = new MemoryEngine();
    await engine.open('test-maxrows', 1);
    await engine.createTable(createSchema('items', {
      id: { type: 'string', primaryKey: true },
      val: { type: 'number' },
    }));

    // 插入 100 行
    for (let i = 0; i < 100; i++) {
      await engine.insert('items', [{ id: `item${i}`, val: i }]);
    }

    const executor = new QueryExecutor(engine, 10); // maxRowsPerQuery=10
    const stmt = parse('SELECT * FROM items');
    const result = await executor.execute(stmt) as Record<string, unknown>[];
    expect(result.length).toBe(10); // 截断为 10 行

    await engine.close();
  });

  test('maxRowsPerQuery=0 表示不限制', async () => {
    const engine = new MemoryEngine();
    await engine.open('test-nolimit', 1);
    await engine.createTable(createSchema('items', {
      id: { type: 'string', primaryKey: true },
    }));
    for (let i = 0; i < 50; i++) {
      await engine.insert('items', [{ id: `i${i}` }]);
    }
    const executor = new QueryExecutor(engine, 0);
    const stmt = parse('SELECT * FROM items');
    const result = await executor.execute(stmt) as Record<string, unknown>[];
    expect(result.length).toBe(50);
    await engine.close();
  });
});

// ---------------------------------------------------------------------------
// P0-5: WAL full 模式真正同步
// ---------------------------------------------------------------------------

describe('[v0.2.5] P0-5: WAL full 模式同步', () => {
  test('append 在 full 模式下是 async 且可 await', async () => {
    let appendCount = 0;
    const wal = new WAL({
      append: async (_data: Uint8Array) => { appendCount++; },
      readAll: async () => new Uint8Array(0),
      truncate: async () => {},
      exists: async () => false,
    }, true, 'full');

    // append 现在返回 Promise
    await wal.append({
      type: 1, // INSERT
      txnId: 0,
      tableName: 'test',
      key: 'k1',
      data: { v: 1 },
    } as any);

    expect(appendCount).toBe(1);
  });
});

// ---------------------------------------------------------------------------
// P0-6: PluginManager.install 传 db 实例
// ---------------------------------------------------------------------------

describe('[v0.2.5] P0-6: PluginManager.install 传 db 实例', () => {
  test('register 传 db 给 install', () => {
    let receivedDb: unknown = null;
    const plugin: MetonaPlugin = {
      name: 'test-plugin',
      install: (db) => { receivedDb = db; },
      destroy: () => {},
    };
    const pm = new PluginManager();
    const fakeDb = { name: 'fake' };
    pm.register(plugin, fakeDb);
    expect(receivedDb).toBe(fakeDb);
  });
});

// ---------------------------------------------------------------------------
// P1-7: SSTableReader 二分查找统一
// ---------------------------------------------------------------------------

describe('[v0.2.5] P1-7: SSTableReader 二分查找', () => {
  test('rangeScan 使用二分查找正确定位', () => {
    // 构建一个 SSTable 手工
    const { SSTableBuilder } = require('../src/engine/aria/index/sstable_builder');
    const builder = new SSTableBuilder(4096);
    // 添加足够多的条目以形成多个 block
    for (let i = 0; i < 100; i++) {
      const key = `key${String(i).padStart(5, '0')}`;
      builder.add(key, { data: `value${i}` });
    }
    const { sstableData } = builder.build();
    const meta: SSTableMeta = {
      id: 1,
      level: 0,
      minKey: 'key00000',
      maxKey: 'key00099',
      blockCount: 1,
      totalSize: sstableData.byteLength,
      bloomData: null,
    };
    const reader = new SSTableReader(sstableData, meta);

    // 精确查找
    const result = reader.get('key00050');
    expect(result).not.toBeNull();
    expect((result as any).data).toBe('value50');

    // 范围扫描
    const collected: string[] = [];
    reader.rangeScan('key00010', 'key00020', (k) => collected.push(k));
    expect(collected.length).toBeGreaterThan(0);
    expect(collected[0]).toBe('key00010');
  });
});

// ---------------------------------------------------------------------------
// P1-8: SQL 注入防护 — 表名校验
// 真实覆盖位置：tests/integrations/react.test.ts（useTable）
//                 tests/integrations/vue.test.ts（useSqlarkTable）
// 通过真实 hooks 调用触发 validateTableName，验证非法表名抛错。
// 注：v0.2.6 移除此处"复制正则自测"的伪测试（未触达真实代码）。
// ---------------------------------------------------------------------------

// ---------------------------------------------------------------------------
// P1-9: crypto 实例化
// ---------------------------------------------------------------------------

describe('[v0.2.5] P1-9: CryptoManager 实例化', () => {
  test('CryptoManager 可以独立实例化', () => {
    const cm1 = new CryptoManager();
    const cm2 = new CryptoManager();
    expect(cm1.enabled).toBe(false);
    expect(cm2.enabled).toBe(false);
    // 两个实例互不影响
    expect(cm1).not.toBe(cm2);
  });
});

// ---------------------------------------------------------------------------
// P2-14: ALTER TABLE 语法
// ---------------------------------------------------------------------------

describe('[v0.2.5] P2-14: ALTER TABLE', () => {
  test('解析 ALTER TABLE ADD COLUMN', () => {
    const stmt = parse('ALTER TABLE users ADD COLUMN email VARCHAR(255) UNIQUE');
    expect(stmt.type).toBe('ALTER_TABLE');
    expect((stmt as any).name).toBe('users');
    expect((stmt as any).action).toBe('ADD');
    expect((stmt as any).column.name).toBe('email');
  });

  test('解析 ALTER TABLE DROP COLUMN', () => {
    const stmt = parse('ALTER TABLE users DROP COLUMN email');
    expect(stmt.type).toBe('ALTER_TABLE');
    expect((stmt as any).action).toBe('DROP');
    expect((stmt as any).column.name).toBe('email');
  });

  test('执行 ALTER TABLE ADD COLUMN', async () => {
    const engine = new MemoryEngine();
    await engine.open('test-alter', 1);
    await engine.createTable(createSchema('users', {
      id: { type: 'string', primaryKey: true },
      name: { type: 'string' },
    }));

    const executor = new QueryExecutor(engine);
    const stmt = parse('ALTER TABLE users ADD COLUMN email VARCHAR(255)');
    await executor.execute(stmt);

    const schema = await engine.getTableSchema('users');
    expect(schema!.columns.email).toBeDefined();
    await engine.close();
  });

  test('执行 ALTER TABLE DROP COLUMN', async () => {
    const engine = new MemoryEngine();
    await engine.open('test-alter-drop', 1);
    await engine.createTable(createSchema('users', {
      id: { type: 'string', primaryKey: true },
      name: { type: 'string' },
      email: { type: 'string' },
    }));

    const executor = new QueryExecutor(engine);
    const stmt = parse('ALTER TABLE users DROP COLUMN email');
    await executor.execute(stmt);

    const schema = await engine.getTableSchema('users');
    expect(schema!.columns.email).toBeUndefined();
    await engine.close();
  });
});

// ---------------------------------------------------------------------------
// P2-15: TRUNCATE TABLE 语法
// ---------------------------------------------------------------------------

describe('[v0.2.5] P2-15: TRUNCATE TABLE', () => {
  test('解析 TRUNCATE TABLE', () => {
    const stmt = parse('TRUNCATE TABLE users');
    expect(stmt.type).toBe('TRUNCATE_TABLE');
    expect((stmt as any).name).toBe('users');
  });

  test('执行 TRUNCATE TABLE 清空数据', async () => {
    const engine = new MemoryEngine();
    await engine.open('test-truncate', 1);
    await engine.createTable(createSchema('items', {
      id: { type: 'string', primaryKey: true },
    }));
    await engine.insert('items', [
      { id: 'a' }, { id: 'b' }, { id: 'c' },
    ]);

    const executor = new QueryExecutor(engine);
    const stmt = parse('TRUNCATE TABLE items');
    await executor.execute(stmt);

    const rows = await engine.find('items', { table: 'items' });
    expect(rows.length).toBe(0);
    await engine.close();
  });
});

// ---------------------------------------------------------------------------
// P2-12: WAL 大小阈值接入 checkpoint
// ---------------------------------------------------------------------------

describe('[v0.2.5] P2-12: WAL 大小阈值', () => {
  test('CheckpointManager 接收 walSizeThreshold 参数', () => {
    const { CheckpointManager } = require('../src/engine/aria/wal/checkpoint');
    const fakeLsm = { flush: async () => {} };
    const fakeWal = { flush: async () => {}, checkpoint: async () => {}, getBufferedCount: () => 0 };
    const cm = new CheckpointManager(fakeLsm, fakeWal, null, 1000, 1024);
    expect(cm).toBeDefined();
  });
});

// ---------------------------------------------------------------------------
// P2-13: compactLevelSync 接口公开化
// ---------------------------------------------------------------------------

describe('[v0.2.5] P2-13: compactLevel public', () => {
  test('LSM.compactLevel 是 public 方法', () => {
    const { LSM } = require('../src/engine/aria/index/lsm');
    const lsm = new LSM({
      sstableStore: {
        save: async () => {}, load: async () => null, delete: async () => {},
        allocateId: async () => 1, listMeta: async () => [], saveMeta: async () => {}, deleteMeta: async () => {},
      },
    });
    expect(typeof lsm.compactLevel).toBe('function');
  });
});