/**
 * v0.6.1 生产矩阵审计 — 模式 × 功能全组合验收
 *
 * 后端（opfs/kv/memory）× 特性（页面化/加密/压缩/WAL开关/同步模式）×
 * 功能（CRUD/二级索引/事务/崩溃恢复/主键变更一致性）
 *
 * 目标：全部组合生产级可用。任一组合同等断言 —— 数据完整、索引一致、崩溃恢复不丢。
 */
import { AriaEngine } from '../../src/engine/aria/index';
import { createSchema } from '../../src/table/schema';
import { SharedMemoryBackend } from '../../src/engine/kvstore/shared_memory_medium';
import { resetOPFSMock } from '../helpers/storage-harness';

let counter = 0;
function uniqueDB(): string {
  return `mx-${Date.now()}-${++counter}-${Math.random().toString(36).slice(2, 6)}`;
}

const SCHEMA = () => createSchema('big', {
  id: { type: 'string', primaryKey: true },
  val: { type: 'number' },
  tag: { type: 'string', index: true },
  grp: { type: 'number', index: true },
  name: { type: 'string' },
});

/** 写入 total 行（tag/grp 双索引） */
async function seed(engine: AriaEngine, table: string, total: number): Promise<void> {
  for (let batch = 0; batch < total / 1000; batch++) {
    const rows = [] as Record<string, unknown>[];
    for (let i = 0; i < 1000; i++) {
      const idx = batch * 1000 + i;
      rows.push({ id: `k${idx}`, val: idx, tag: `t${idx % 10}`, grp: idx % 5, name: `U${idx}` });
    }
    await engine.insert(table, rows);
  }
}

/** 双索引完整性断言 */
async function assertIndexes(engine: AriaEngine, table: string, total: number): Promise<void> {
  expect(await engine.count(table)).toBe(total);
  for (let t = 0; t < 10; t++) {
    expect(await engine.find(table, { table, where: { tag: `t${t}` } })).toHaveLength(total / 10);
  }
  for (let g = 0; g < 5; g++) {
    expect(await engine.find(table, { table, where: { grp: g } })).toHaveLength(total / 5);
  }
}

/** 崩溃恢复：关闭后端 → 新引擎重开同库 */
async function reopen(dbName: string, config: Record<string, unknown>): Promise<AriaEngine> {
  const engine2 = new AriaEngine(config as never);
  await engine2.open(dbName, 1);
  return engine2;
}

beforeEach(() => {
  SharedMemoryBackend.clearRegistry();
  resetOPFSMock();
});

describe('生产矩阵审计 — 后端 × 核心功能', () => {
  const coreConfig = (backend: string): Record<string, unknown> => ({
    storageBackend: backend,
    memtableSizeThreshold: 256 * 1024,
    checkpointInterval: 5000,
    walSyncMode: 'full',
  });

  it('kv × 3 万行 + 双索引 + 事务 + 崩溃恢复', async () => {
    const dbName = uniqueDB();
    const engine = new AriaEngine(coreConfig('kv') as never);
    await engine.open(dbName, 1);
    await engine.createTable(SCHEMA());
    await seed(engine, 'big', 30000);
    // 事务：提交一批更新
    await engine.beginTransaction();
    for (let i = 0; i < 100; i++) {
      await engine.update('big', { table: 'big', where: { id: `k${i}` } }, { name: `Tx${i}` });
    }
    await engine.commitTransaction();
    await assertIndexes(engine, 'big', 30000);
    const row = await engine.find('big', { table: 'big', where: { id: 'k50' } });
    expect(row[0].name).toBe('Tx50');
    // 事务回滚不产生残留
    await engine.beginTransaction();
    for (let i = 1000; i < 1100; i++) {
      await engine.update('big', { table: 'big', where: { id: `k${i}` } }, { name: `Rx${i}` });
    }
    await engine.rollbackTransaction();
    expect((await engine.find('big', { table: 'big', where: { id: 'k1050' } }))[0].name).toBe('U1050');
    // 崩溃恢复
    await (engine as any).backend.close();
    (engine as any).opened = false;
    const engine2 = await reopen(dbName, coreConfig('kv'));
    await assertIndexes(engine2, 'big', 30000);
    expect((await engine2.find('big', { table: 'big', where: { id: 'k50' } }))[0].name).toBe('Tx50');
    await engine2.close();
  }, 600000);

  it('opfs × 3 万行 + 双索引 + 崩溃恢复', async () => {
    const dbName = uniqueDB();
    const engine = new AriaEngine(coreConfig('opfs') as never);
    await engine.open(dbName, 1);
    await engine.createTable(SCHEMA());
    await seed(engine, 'big', 30000);
    await assertIndexes(engine, 'big', 30000);
    await (engine as any).backend.close();
    (engine as any).opened = false;
    const engine2 = await reopen(dbName, coreConfig('opfs'));
    await assertIndexes(engine2, 'big', 30000);
    await engine2.close();
  }, 600000);

  it('memory × 2 万行 + 双索引 + 事务回滚', async () => {
    const engine = new AriaEngine(coreConfig('memory') as never);
    await engine.open(uniqueDB(), 1);
    await engine.createTable(SCHEMA());
    await seed(engine, 'big', 20000);
    await engine.beginTransaction();
    await engine.update('big', { table: 'big', where: { id: 'k7' } }, { tag: 't9' });
    await engine.rollbackTransaction();
    await assertIndexes(engine, 'big', 20000);
    // 更新后索引一致（无脏数据）——k7 从 t7 移到 t9
    await engine.update('big', { table: 'big', where: { id: 'k7' } }, { tag: 't9' });
    expect(await engine.find('big', { table: 'big', where: { tag: 't9' } })).toHaveLength(2001);
    expect(await engine.find('big', { table: 'big', where: { tag: 't7' } })).toHaveLength(1999);
    await engine.close();
  }, 600000);
});

describe('生产矩阵审计 — 特性组合', () => {
  it('kv × 加密 × 压缩 × 页面化（默认开）→ 2 万行 + 崩溃恢复', async () => {
    const dbName = uniqueDB();
    const cfg = {
      storageBackend: 'kv', memtableSizeThreshold: 256 * 1024, checkpointInterval: 5000,
      walSyncMode: 'full', compression: true, encryption: { password: 'matrix-secret' },
    };
    const engine = new AriaEngine(cfg as never);
    await engine.open(dbName, 1);
    await engine.createTable(SCHEMA());
    await seed(engine, 'big', 20000);
    await assertIndexes(engine, 'big', 20000);
    await (engine as any).backend.close();
    (engine as any).opened = false;
    const engine2 = await reopen(dbName, cfg);
    await assertIndexes(engine2, 'big', 20000);
    await engine2.close();
    // 错误密码必须拒绝打开
    const bad = new AriaEngine({ ...cfg, encryption: { password: 'wrong' } } as never);
    await expect(bad.open(dbName, 1)).rejects.toThrow();
  }, 600000);

  it('kv × pageStorage:false（整 value）→ 2 万行 + 崩溃恢复', async () => {
    const dbName = uniqueDB();
    const cfg = {
      storageBackend: 'kv', memtableSizeThreshold: 256 * 1024, checkpointInterval: 5000,
      walSyncMode: 'full', pageStorage: false,
    };
    const engine = new AriaEngine(cfg as never);
    await engine.open(dbName, 1);
    await engine.createTable(SCHEMA());
    await seed(engine, 'big', 20000);
    await assertIndexes(engine, 'big', 20000);
    await (engine as any).backend.close();
    (engine as any).opened = false;
    const engine2 = await reopen(dbName, cfg);
    await assertIndexes(engine2, 'big', 20000);
    await engine2.close();
  }, 600000);

  it('opfs × 加密 × 压缩 × 页面化全开 → 2 万行 + 崩溃恢复', async () => {
    const dbName = uniqueDB();
    const cfg = {
      storageBackend: 'opfs', memtableSizeThreshold: 256 * 1024, checkpointInterval: 5000,
      walSyncMode: 'full', compression: true, encryption: { password: 'matrix-secret' },
      pageStorage: true,
    };
    const engine = new AriaEngine(cfg as never);
    await engine.open(dbName, 1);
    await engine.createTable(SCHEMA());
    await seed(engine, 'big', 20000);
    await assertIndexes(engine, 'big', 20000);
    await (engine as any).backend.close();
    (engine as any).opened = false;
    const engine2 = await reopen(dbName, cfg);
    await assertIndexes(engine2, 'big', 20000);
    await engine2.close();
  }, 600000);

  it('opfs × walEnabled:false → 写入 + 优雅关闭后重开完整', async () => {
    const dbName = uniqueDB();
    const cfg = {
      storageBackend: 'opfs', memtableSizeThreshold: 128 * 1024, checkpointInterval: 2000,
      walEnabled: false, pageStorage: false,
    };
    const engine = new AriaEngine(cfg as never);
    await engine.open(dbName, 1);
    await engine.createTable(SCHEMA());
    await seed(engine, 'big', 20000);
    await assertIndexes(engine, 'big', 20000);
    // 优雅关闭：close 等待后台链 + checkpoint 落盘 → 重开完整
    await engine.close();
    const engine2 = await reopen(dbName, cfg);
    await assertIndexes(engine2, 'big', 20000);
    await engine2.close();
  }, 600000);

  it('kv × walEnabled:false → 写入 + 优雅关闭后重开完整', async () => {
    const dbName = uniqueDB();
    const cfg = {
      storageBackend: 'kv', memtableSizeThreshold: 128 * 1024, checkpointInterval: 2000,
      walEnabled: false, pageStorage: false,
    };
    const engine = new AriaEngine(cfg as never);
    await engine.open(dbName, 1);
    await engine.createTable(SCHEMA());
    await seed(engine, 'big', 20000);
    await assertIndexes(engine, 'big', 20000);
    await engine.close();
    const engine2 = await reopen(dbName, cfg);
    await assertIndexes(engine2, 'big', 20000);
    await engine2.close();
  }, 600000);

  it('kv × walSyncMode:batch → 优雅关闭后重开完整（崩溃保底已 checkpoint 数据）', async () => {
    const dbName = uniqueDB();
    const cfg = {
      storageBackend: 'kv', memtableSizeThreshold: 256 * 1024, checkpointInterval: 3000,
      walSyncMode: 'batch',
    };
    const engine = new AriaEngine(cfg as never);
    await engine.open(dbName, 1);
    await engine.createTable(SCHEMA());
    await seed(engine, 'big', 20000);
    await assertIndexes(engine, 'big', 20000);
    await engine.close();
    const engine2 = await reopen(dbName, cfg);
    await assertIndexes(engine2, 'big', 20000);
    await engine2.close();
  }, 600000);

  it('opfs × walSyncMode:none → 优雅关闭后重开完整（checkpoint 兜底）', async () => {
    const dbName = uniqueDB();
    const cfg = {
      storageBackend: 'opfs', memtableSizeThreshold: 128 * 1024, checkpointInterval: 3000,
      walSyncMode: 'none', pageStorage: false,
    };
    const engine = new AriaEngine(cfg as never);
    await engine.open(dbName, 1);
    await engine.createTable(SCHEMA());
    await seed(engine, 'big', 20000);
    await assertIndexes(engine, 'big', 20000);
    await engine.close();
    const engine2 = await reopen(dbName, cfg);
    await assertIndexes(engine2, 'big', 20000);
    await engine2.close();
  }, 600000);
});

describe('生产矩阵审计 — 主键变更索引一致性（三后端）', () => {
  it('kv × 主键变更：新旧索引无脏数据', async () => {
    const engine = new AriaEngine({ storageBackend: 'kv', memtableSizeThreshold: 256 * 1024, checkpointInterval: 100000 } as never);
    await engine.open(uniqueDB(), 1);
    await engine.createTable(SCHEMA());
    await engine.insert('big', [{ id: 'a1', val: 1, tag: 'x', grp: 1, name: 'A' }]);
    // 主键 a1 → b1（tag/grp 不变）
    await engine.update('big', { table: 'big', where: { id: 'a1' } }, { id: 'b1' });
    expect(await engine.count('big')).toBe(1);
    expect(await engine.find('big', { table: 'big', where: { tag: 'x' } })).toHaveLength(1);
    expect(await engine.find('big', { table: 'big', where: { id: 'a1' } })).toHaveLength(0);
    await engine.close();
  }, 300000);

  it('opfs × 主键变更 + 崩溃恢复：索引一致', async () => {
    const dbName = uniqueDB();
    const engine = new AriaEngine({ storageBackend: 'opfs', memtableSizeThreshold: 256 * 1024, checkpointInterval: 100000, pageStorage: false } as never);
    await engine.open(dbName, 1);
    await engine.createTable(SCHEMA());
    for (let i = 0; i < 5000; i++) {
      await engine.insert('big', [{ id: `k${i}`, val: i, tag: `t${i % 10}`, grp: i % 5, name: `U${i}` }]);
    }
    for (let i = 0; i < 5000; i += 10) {
      await engine.update('big', { table: 'big', where: { id: `k${i}` } }, { id: `p${i}` });
    }
    await (engine as any).backend.close();
    (engine as any).opened = false;
    const engine2 = new AriaEngine({ storageBackend: 'opfs', memtableSizeThreshold: 256 * 1024, checkpointInterval: 100000, pageStorage: false } as never);
    await engine2.open(dbName, 1);
    expect(await engine2.count('big')).toBe(5000);
    for (let t = 0; t < 10; t++) {
      expect(await engine2.find('big', { table: 'big', where: { tag: `t${t}` } })).toHaveLength(500);
    }
    await engine2.close();
  }, 600000);

  it('memory × 级联删除 + 索引清理', async () => {
    const engine = new AriaEngine({ storageBackend: 'memory', memtableSizeThreshold: 256 * 1024 } as never);
    await engine.open(uniqueDB(), 1);
    await engine.createTable(createSchema('parent', {
      id: { type: 'string', primaryKey: true },
      tag: { type: 'string', index: true },
    }));
    await engine.createTable(createSchema('child', {
      id: { type: 'string', primaryKey: true },
      pid: { type: 'string', references: 'parent.id', onDelete: 'CASCADE', index: true },
    }));
    for (let i = 0; i < 2000; i++) {
      await engine.insert('parent', [{ id: `p${i}`, tag: `t${i % 10}` }]);
      await engine.insert('child', [{ id: `c${i}`, pid: `p${i}` }]);
    }
    await engine.delete('parent', { table: 'parent', where: { id: 'p5' } });
    expect(await engine.count('child')).toBe(1999);
    expect(await engine.find('child', { table: 'child', where: { pid: 'p5' } })).toHaveLength(0);
    await engine.close();
  }, 300000);
});