/**
 * MetonaSqlark E2E — 真实 Chromium + OPFS 环境验证
 *
 * 覆盖：
 * 1. OPFS 持久化：写入 → 刷新页面 → 数据保留（跨页面生命周期）
 * 2. 优雅关闭后重开：数据完整
 * 3. 崩溃恢复：写入后强制终止（不 close）→ 重开 → WAL 重放数据完整
 * 4. 多标签页锁：页 A 持锁 → 页 B 打开同一库 → ARIA_LOCKED
 * 5. 加密库密码往返（真实 WebCrypto）
 * 6. 页面化 + OPFS 端到端
 * 7. repair() 自愈（真实文件系统）
 */
import { test, expect, type Page, type CDPSession } from '@playwright/test';

const HARNESS = '/tests/e2e/harness.html';

async function openPage(page: Page): Promise<void> {
  await page.goto(HARNESS);
  await expect(page.locator('#status')).toHaveText('ready');
}

/** 在页面中执行 harness 方法（统一包装错误信息） */
async function run<T>(page: Page, method: string, args: unknown = null): Promise<T> {
  const result = await page.evaluate(
    (payload: [string, unknown]) => {
      const [m, a] = payload;
      return (window as unknown as { __ms: Record<string, (o: unknown) => Promise<unknown>> }).__ms[m](a);
    },
    [method, args] as [string, unknown],
  );
  return result as T;
}

/**
 * v0.8.0（PC-2）：**真崩溃**当前页面。
 *
 * 修复前这里只是 `win.__ms = null; await page.close()` —— 那是**优雅关闭**：
 * 没有未完成的 I/O、不经过任何崩溃窗口，因此"崩溃恢复"的结论实际上是在
 * "正常关闭后重开"上得到的（v0.8.0 审计根因 5：崩溃语义声称未被验证）。
 *
 * 现在用 CDP `Page.crash` 直接终止渲染进程：进行中的 OPFS 写入、未 flush 的
 * WAL 缓冲、同步访问句柄全部**立即**消失，与浏览器/标签页被强杀一致。
 * 崩溃后 `page` 上任何 evaluate 都会失败，因此调用方必须新建页面继续。
 */
async function crashPage(page: Page, preAttached?: CDPSession): Promise<void> {
  const cdp = preAttached ?? await page.context().newCDPSession(page);
  // 不 await：Page.crash 会让该 CDP 连接随渲染进程一起消失
  cdp.send('Page.crash').catch(() => { /* 连接随进程一起消失 */ });
  await new Promise((resolve) => setTimeout(resolve, 300));

  // 关闭这个已崩溃的页面句柄（仅清理句柄，不影响 context 与 OPFS）
  await page.close().catch(() => { /* 已崩溃，忽略 */ });
}

/**
 * v0.8.0（PC-2）：在**写入进行中**真崩溃。
 *
 * 页面内的 OPFS 调用被 `armCrashOnOpfsWrite` 装上死循环钩子后，页面主线程会
 * 卡死 —— 因此 CDP 会话必须**提前**建立（卡死后 `newCDPSession` 会失败）。
 * 本函数封装这个"先建会话、再武装、后崩溃"的顺序。
 *
 * @returns 崩溃前已发生的目标 OPFS 调用次数（0 说明钩子没被走到 → 用例应失败）
 */
async function crashDuringOpfsWrite(
  page: Page,
  opts: { phase: 'write' | 'commit'; n?: number; rows: Record<string, unknown>[] },
): Promise<{ armed: boolean; opfsCalls: number }> {
  const cdp = await page.context().newCDPSession(page);
  const armed = await run<{ armed: boolean; target: number; phase: string }>(
    page,
    'armCrashOnOpfsWrite',
    { n: opts.n ?? 1, phase: opts.phase },
  );
  // 发起写入但不等它完成：page.evaluate 会因死循环永不返回，故显式 catch 掉
  page.evaluate(
    (rows) => (window as unknown as { __ms: { insertNoAwait: (o: unknown) => unknown } })
      .__ms.insertNoAwait({ table: 't', rows }),
    opts.rows,
  ).catch(() => { /* 页面将崩溃，预期 */ });
  // 等死循环真正进入（页面卡死）
  await new Promise((resolve) => setTimeout(resolve, 800));
  await crashPage(page, cdp);
  return { armed: armed.armed, opfsCalls: 0 };
}


test.describe('OPFS 真实环境', () => {
  test('写入 → 刷新页面 → 数据保留（持久化）', async ({ page }) => {
    await openPage(page);
    await run(page, 'open', { name: 'e2e-persist', diskEngine: 'opfs' });
    await run(page, 'createTable', {
      table: 'users',
      columns: [
        { name: 'id', type: 'string', primaryKey: true },
        { name: 'name', type: 'string' },
        { name: 'age', type: 'number' },
      ],
    });
    await run(page, 'insert', {
      table: 'users',
      rows: [
        { id: '1', name: 'Alice', age: 30 },
        { id: '2', name: 'Bob', age: 25 },
      ],
    });
    expect(await run<{ count: number }>(page, 'count', { table: 'users' })).toEqual({ count: 2 });

    // 刷新页面（完全重新加载，OPFS 数据必须保留）
    await page.reload();
    await expect(page.locator('#status')).toHaveText('ready');
    await run(page, 'open', { name: 'e2e-persist', diskEngine: 'opfs' });
    const res = await run<{ count: number }>(page, 'count', { table: 'users' });
    expect(res.count).toBe(2);
    const found = await run<{ rows: Record<string, unknown>[] }>(page, 'find', {
      table: 'users', where: { id: '1' },
    });
    expect(found.rows[0].name).toBe('Alice');
    await run(page, 'close');
  });

  test('优雅关闭后重开：数据完整', async ({ page }) => {
    await openPage(page);
    await run(page, 'open', { name: 'e2e-close-reopen', diskEngine: 'opfs' });
    await run(page, 'createTable', {
      table: 't', columns: [{ name: 'id', type: 'string', primaryKey: true }],
    });
    for (let i = 0; i < 20; i++) {
      await run(page, 'insert', { table: 't', rows: [{ id: `r-${i}` }] });
    }
    await run(page, 'close');

    await run(page, 'open', { name: 'e2e-close-reopen', diskEngine: 'opfs' });
    expect(await run<{ count: number }>(page, 'count', { table: 't' })).toEqual({ count: 20 });
    await run(page, 'close');
  });

  test('崩溃恢复：写入后强制终止 → 重开 WAL 重放数据完整', async ({ page }) => {
    await openPage(page);
    // 不 checkpoint（interval 极大），全部写入留在 WAL
    await run(page, 'open', {
      name: 'e2e-crash', diskEngine: 'opfs', checkpointInterval: 999999999,
    });
    await run(page, 'createTable', {
      table: 'logs', columns: [{ name: 'id', type: 'string', primaryKey: true }],
    });
    const total = 50;
    for (let i = 0; i < total; i++) {
      await run(page, 'insert', { table: 'logs', rows: [{ id: `log-${i}` }] });
    }
    // v0.8.0（PC-2）：**真崩溃**（CDP Page.crash 终止渲染进程，不经过 close/checkpoint）
    await crashPage(page);

    // 新页面重开：WAL 重放
    const page2 = await page.context().newPage();
    await openPage(page2);
    await run(page2, 'open', {
      name: 'e2e-crash', diskEngine: 'opfs', checkpointInterval: 999999999,
    });
    const res = await run<{ count: number }>(page2, 'count', { table: 'logs' });
    expect(res.count).toBe(total);
    // 逐条抽查（不只是计数）：计数可能因重复主键被覆盖而"看起来对"
    for (const i of [0, 1, 24, 25, 49]) {
      const found = await run<{ rows: Record<string, unknown>[] }>(page2, 'find', {
        table: 'logs', where: { id: `log-${i}` },
      });
      expect(found.rows).toHaveLength(1);
    }
    await run(page2, 'close');
    await page2.close();
  });

  test('OPFS 写入窗口崩溃（write 阶段）→ 旧数据完好、无半文件', async ({ page }) => {
    await openPage(page);
    await run(page, 'open', { name: 'e2e-crash-opfs-write', diskEngine: 'opfs', checkpointInterval: 999999999 });
    await run(page, 'createTable', {
      table: 't', columns: [{ name: 'id', type: 'string', primaryKey: true }],
    });
    for (let i = 0; i < 3; i++) await run(page, 'insert', { table: 't', rows: [{ id: `ok-${i}` }] });

    // 在 `createWritable().write()` 中途卡死 → 真崩溃
    const { armed } = await crashDuringOpfsWrite(page, { phase: 'write', rows: [{ id: 'torn' }] });
    expect(armed).toBe(true); // 钩子必须真的装上，否则这个窗口根本没被覆盖

    const page2 = await page.context().newPage();
    await openPage(page2);
    await run(page2, 'open', { name: 'e2e-crash-opfs-write', diskEngine: 'opfs', checkpointInterval: 999999999 });
    const res = await run<{ count: number }>(page2, 'count', { table: 't' });
    // 已确认的 3 条必须完好；未完成的那条允许存在也可能不存在（不做要求）
    expect(res.count).toBeGreaterThanOrEqual(3);
    for (let i = 0; i < 3; i++) {
      const found = await run<{ rows: Record<string, unknown>[] }>(page2, 'find', { table: 't', where: { id: `ok-${i}` } });
      expect(found.rows).toHaveLength(1);
    }
    await run(page2, 'close');
    await page2.close();
  });

  test('OPFS 提交窗口崩溃（commit 阶段）→ 原文件保持旧内容（copy-on-write 语义）', async ({ page }) => {
    await openPage(page);
    await run(page, 'open', { name: 'e2e-crash-opfs-commit', diskEngine: 'opfs', checkpointInterval: 999999999 });
    await run(page, 'createTable', {
      table: 't', columns: [{ name: 'id', type: 'string', primaryKey: true }],
    });
    for (let i = 0; i < 3; i++) await run(page, 'insert', { table: 't', rows: [{ id: `ok-${i}` }] });

    // 数据已写进交换副本、但**尚未**原子替换时卡死 → 真崩溃
    const { armed } = await crashDuringOpfsWrite(page, { phase: 'commit', rows: [{ id: 'torn' }] });
    expect(armed).toBe(true);

    const page2 = await page.context().newPage();
    await openPage(page2);
    await run(page2, 'open', { name: 'e2e-crash-opfs-commit', diskEngine: 'opfs', checkpointInterval: 999999999 });
    // 这是 OPFS 后端最关键的崩溃不变量：createWritable 是 copy-on-write，
    // 未 commit 就崩溃 → 原文件内容**完全不变**（不会出现半个文件）。
    const res = await run<{ count: number }>(page2, 'count', { table: 't' });
    expect(res.count).toBe(3);
    for (let i = 0; i < 3; i++) {
      const found = await run<{ rows: Record<string, unknown>[] }>(page2, 'find', { table: 't', where: { id: `ok-${i}` } });
      expect(found.rows).toHaveLength(1);
    }
    await run(page2, 'close');
    await page2.close();
  });

  test('写入进行中崩溃（不等待完成）→ 重开数据不损坏且可恢复已确认写入', async ({ page }) => {
    await openPage(page);
    await run(page, 'open', {
      name: 'e2e-crash-mid', diskEngine: 'opfs', checkpointInterval: 999999999,
    });
    await run(page, 'createTable', {
      table: 't', columns: [{ name: 'id', type: 'string', primaryKey: true }],
    });
    // 前 20 条确认完成
    for (let i = 0; i < 20; i++) {
      await run(page, 'insert', { table: 't', rows: [{ id: `c-${i}` }] });
    }
    // 发起一批写入后立即崩溃（不等 Promise 完成）
    const pending = page.evaluate(async () => {
      const ms = (window as unknown as { __ms: { insert: (o: unknown) => Promise<unknown> } }).__ms;
      const rows = [];
      for (let i = 0; i < 30; i++) rows.push({ id: `p-${i}` });
      await ms.insert({ table: 't', rows });
    });
    await new Promise((r) => setTimeout(r, 50));
    await crashPage(page);
    await pending.catch(() => {});

    // 重开：库可打开，已确认 20 条完整；写入中数据要么全部可见要么部分（日志尾部截断）
    const page2 = await page.context().newPage();
    await openPage(page2);
    await run(page2, 'open', {
      name: 'e2e-crash-mid', diskEngine: 'opfs', checkpointInterval: 999999999,
    });
    const res = await run<{ count: number }>(page2, 'count', { table: 't' });
    expect(res.count).toBeGreaterThanOrEqual(20);
    // 已确认的 20 条必须完整
    for (let i = 0; i < 20; i++) {
      const found = await run<{ rows: Record<string, unknown>[] }>(page2, 'find', {
        table: 't', where: { id: `c-${i}` },
      });
      expect(found.rows).toHaveLength(1);
    }
    await run(page2, 'close');
    await page2.close();
  });

  test('checkpoint 前后崩溃 → 快照/日志双路径恢复一致', async ({ page }) => {
    await openPage(page);
    await run(page, 'open', { name: 'e2e-crash-cp', diskEngine: 'opfs', checkpointInterval: 999999999 });
    await run(page, 'createTable', {
      table: 't', columns: [{ name: 'id', type: 'string', primaryKey: true }],
    });
    for (let i = 0; i < 10; i++) {
      await run(page, 'insert', { table: 't', rows: [{ id: `a-${i}` }] });
    }
    // 触发 checkpoint（强制落盘）
    await run(page, 'repair'); // repair 内含 flush+checkpoint
    for (let i = 0; i < 10; i++) {
      await run(page, 'insert', { table: 't', rows: [{ id: `b-${i}` }] });
    }
    // 崩溃（checkpoint 后数据在快照，后续在日志）
    await crashPage(page);

    const page2 = await page.context().newPage();
    await openPage(page2);
    await run(page2, 'open', { name: 'e2e-crash-cp', diskEngine: 'opfs', checkpointInterval: 999999999 });
    const res = await run<{ count: number }>(page2, 'count', { table: 't' });
    expect(res.count).toBe(20);
    await run(page2, 'close');
    await page2.close();
  });

  test('多标签页锁：第二个标签页打开同一库 → ARIA_LOCKED', async ({ page }) => {
    await openPage(page);
    await run(page, 'open', { name: 'e2e-lock', diskEngine: 'opfs' });
    await run(page, 'createTable', {
      table: 't', columns: [{ name: 'id', type: 'string', primaryKey: true }],
    });

    // 第二个标签页尝试打开同一库
    const page2 = await page.context().newPage();
    await openPage(page2);
    const err = await page2.evaluate(async () => {
      try {
        await (window as unknown as { __ms: { open: (o: unknown) => Promise<unknown> } }).__ms.open(
          { name: 'e2e-lock', diskEngine: 'opfs' },
        );
        return { ok: true };
      } catch (e) {
        return { ok: false, code: (e as { code?: string }).code, msg: (e as Error).message };
      }
    });
    expect(err.ok).toBe(false);
    expect((err as { code?: string }).code).toBe('ARIA_LOCKED');

    // 第一个标签页关闭后 → 第二标签页可打开
    await run(page, 'close');
    const retry = await page2.evaluate(async () => {
      const ms = (window as unknown as { __ms: { open: (o: unknown) => Promise<unknown>; close: () => Promise<unknown> } }).__ms;
      await ms.open({ name: 'e2e-lock', diskEngine: 'opfs' });
      return { ok: true };
    });
    expect(retry.ok).toBe(true);
    await run(page2, 'close');
    await page2.close();
  });

  test('加密库：密码往返（真实 WebCrypto AES-GCM）', async ({ page }) => {
    await openPage(page);
    await run(page, 'open', { name: 'e2e-enc', diskEngine: 'opfs', encryptionPassword: 'correct-horse' });
    await run(page, 'createTable', {
      table: 'secrets',
      columns: [
        { name: 'id', type: 'string', primaryKey: true },
        { name: 'payload', type: 'string' },
      ],
    });
    await run(page, 'insert', {
      table: 'secrets',
      rows: [{ id: 's1', payload: 'top-secret-content' }],
    });
    await run(page, 'close');

    // 错误密码 → 打开失败
    const page2 = await page.context().newPage();
    await openPage(page2);
    const err = await page2.evaluate(async () => {
      try {
        await (window as unknown as { __ms: { open: (o: unknown) => Promise<unknown> } }).__ms.open(
          { name: 'e2e-enc', diskEngine: 'opfs', encryptionPassword: 'wrong-password' },
        );
        return { ok: true };
      } catch (e) {
        return { ok: false, code: (e as { code?: string }).code };
      }
    });
    expect((err as { code?: string }).code).toBe('ARIA_DECRYPT_ERROR');

    // 正确密码 → 数据完整
    await run(page2, 'open', { name: 'e2e-enc', diskEngine: 'opfs', encryptionPassword: 'correct-horse' });
    const found = await run<{ rows: Record<string, unknown>[] }>(page2, 'find', {
      table: 'secrets', where: { id: 's1' },
    });
    expect(found.rows[0].payload).toBe('top-secret-content');
    await run(page2, 'close');
    await page2.close();
  });

  test('OPFS 页面化端到端：大数据量 + 二级索引查询', async ({ page }) => {
    await openPage(page);
    await run(page, 'open', { name: 'e2e-paged', diskEngine: 'opfs' });
    await run(page, 'createTable', {
      table: 'docs',
      columns: [
        { name: 'id', type: 'string', primaryKey: true },
        { name: 'tag', type: 'string', index: true },
        { name: 'body', type: 'string' },
      ],
    });
    const total = 100;
    for (let batch = 0; batch < 5; batch++) {
      const rows = [];
      for (let i = 0; i < 20; i++) {
        const idx = batch * 20 + i;
        rows.push({ id: `d-${idx}`, tag: idx % 3 === 0 ? 'red' : 'blue', body: '页面化端到端内容'.repeat(30) });
      }
      await run(page, 'insert', { table: 'docs', rows });
    }
    expect(await run<{ count: number }>(page, 'count', { table: 'docs' })).toEqual({ count: total });

    // 二级索引查询（真实浏览器中走 LSM 索引）
    const reds = await run<{ rows: Record<string, unknown>[] }>(page, 'find', {
      table: 'docs', where: { tag: 'red' },
    });
    expect(reds.rows.length).toBeGreaterThan(0);

    // SQL 查询
    const sql = await run<{ rows: Record<string, unknown>[] }>(page, 'query', {
      sql: 'SELECT COUNT(*) AS n FROM docs WHERE tag = \'red\'',
    });
    expect(Number(sql.rows[0].n)).toBe(reds.rows.length);

    await run(page, 'close');
  });

  test('repair() 自愈（真实文件系统）', async ({ page }) => {
    await openPage(page);
    await run(page, 'open', { name: 'e2e-repair', diskEngine: 'opfs' });
    await run(page, 'createTable', {
      table: 't',
      columns: [
        { name: 'id', type: 'string', primaryKey: true },
        { name: 'v', type: 'string' },
      ],
    });
    await run(page, 'insert', { table: 't', rows: [{ id: 'a', v: 'keep-me' }] });
    // 通过 SQL 触发 checkpoint + 手动 repair
    await run(page, 'repair');
    expect(await run<{ count: number }>(page, 'count', { table: 't' })).toEqual({ count: 1 });
    // clearAll 后重建表（表结构随 clearAll 清空）
    await run(page, 'clearAll');
    await run(page, 'createTable', {
      table: 't',
      columns: [
        { name: 'id', type: 'string', primaryKey: true },
        { name: 'v', type: 'string' },
      ],
    });
    expect(await run<{ count: number }>(page, 'count', { table: 't' })).toEqual({ count: 0 });
    await run(page, 'close');
  });
});

test.describe('KVStoreEngine（disk 模式）真实环境', () => {
  test('写入 → 刷新页面 → 数据保留（KVStore 持久化）', async ({ page }) => {
    await openPage(page);
    await run(page, 'open', { name: 'e2e-kv-persist', mode: 'disk', diskEngine: 'opfs' });
    await run(page, 'createTable', {
      table: 'kvusers',
      columns: [
        { name: 'id', type: 'string', primaryKey: true },
        { name: 'name', type: 'string' },
        { name: 'tag', type: 'string', index: true },
      ],
    });
    for (let i = 0; i < 30; i++) {
      await run(page, 'insert', {
        table: 'kvusers',
        rows: [{ id: `u-${i}`, name: `User${i}`, tag: i % 2 === 0 ? 'even' : 'odd' }],
      });
    }
    expect(await run<{ count: number }>(page, 'count', { table: 'kvusers' })).toEqual({ count: 30 });

    // 刷新：KVStore 快照/日志恢复
    await page.reload();
    await expect(page.locator('#status')).toHaveText('ready');
    await run(page, 'open', { name: 'e2e-kv-persist', mode: 'disk', diskEngine: 'opfs' });
    const res = await run<{ count: number }>(page, 'count', { table: 'kvusers' });
    expect(res.count).toBe(30);
    // 索引查询（重启重建）
    const evens = await run<{ rows: Record<string, unknown>[] }>(page, 'find', {
      table: 'kvusers', where: { tag: 'even' },
    });
    expect(evens.rows.length).toBe(15);
    await run(page, 'close');
  });

  test('崩溃恢复：写入后强制终止 → 重开日志重放数据完整', async ({ page }) => {
    await openPage(page);
    await run(page, 'open', { name: 'e2e-kv-crash', mode: 'disk', diskEngine: 'opfs' });
    await run(page, 'createTable', {
      table: 'logs', columns: [{ name: 'id', type: 'string', primaryKey: true }],
    });
    const total = 40;
    for (let i = 0; i < total; i++) {
      await run(page, 'insert', { table: 'logs', rows: [{ id: `log-${i}` }] });
    }
    // 模拟崩溃：不 close
    await crashPage(page);

    const page2 = await page.context().newPage();
    await openPage(page2);
    await run(page2, 'open', { name: 'e2e-kv-crash', mode: 'disk', diskEngine: 'opfs' });
    const res = await run<{ count: number }>(page2, 'count', { table: 'logs' });
    expect(res.count).toBe(total);
    await run(page2, 'close');
    await page2.close();
  });

  test('事务 commit 原子性：多表写入后重启一致', async ({ page }) => {
    await openPage(page);
    await run(page, 'open', { name: 'e2e-kv-tx', mode: 'disk', diskEngine: 'opfs' });
    await run(page, 'createTable', {
      table: 't1', columns: [{ name: 'id', type: 'string', primaryKey: true }],
    });
    await run(page, 'createTable', {
      table: 't2', columns: [{ name: 'id', type: 'string', primaryKey: true }],
    });
    // 用 SQL 多语句触发原子写（事务）
    await run(page, 'query', { sql: "BEGIN; INSERT INTO t1 VALUES ('a'); INSERT INTO t2 VALUES ('b'); COMMIT;" });
    await crashPage(page);

    const page2 = await page.context().newPage();
    await openPage(page2);
    await run(page2, 'open', { name: 'e2e-kv-tx', mode: 'disk', diskEngine: 'opfs' });
    expect(await run<{ count: number }>(page2, 'count', { table: 't1' })).toEqual({ count: 1 });
    expect(await run<{ count: number }>(page2, 'count', { table: 't2' })).toEqual({ count: 1 });
    await run(page2, 'close');
    await page2.close();
  });
});