/**
 * v0.8.0 回归 —— Aria SAVEPOINT 语义根治
 *
 * 覆盖两个此前会导致**静默数据错误**的缺陷：
 *
 *  A3 已回滚的行在崩溃重启后复活
 *     `ROLLBACK TO <savepoint>` 此前只改内存快照、不写 WAL，而 COMMIT 会把整个
 *     txnId 标记为已提交，恢复时按"该事务的全部记录"重放 —— 于是被回滚掉的写入
 *     被重新应用。实测：实时只剩 a，崩溃重开变成 a+b。
 *     修复：savepoint 回滚写入 SAVEPOINT_ROLLBACK 记录（携带 replayFromIndex
 *     边界），恢复时只应用"保存点之后、最后一个标记之前"的写入。
 *
 *  A4 跨事务复用的陈旧 savepoint 静默丢弃当前事务的写入
 *     savepoints 在 commit/rollback 时从不清空，且 rollbackToSavepoint 不校验归属。
 *     实测：新事务 update 后 ROLLBACK TO 上一事务遗留的名字 + COMMIT，写入凭空消失。
 *     修复：事务结束清空 savepoint；回滚前校验 txnId 归属。
 */
import { MetonaSqlark } from '../src/core';
import { AriaEngine } from '../src/engine/aria/index';

describe('[v0.8.0] A4 跨事务 savepoint 泄漏', () => {
  test('陈旧 savepoint 名不可重用，当前事务写入不被替换', async () => {
    const db = await MetonaSqlark.create({ name: 'v080-sp-stale', mode: 'aria', diskEngine: 'memory' } as never);
    await db.defineTable('t', { id: { type: 'string', primaryKey: true }, v: { type: 'number' } });
    await db.query("INSERT INTO t VALUES ('x', 0)");

    await db.query('BEGIN');
    await db.query("UPDATE t SET v = 9 WHERE id='x'");
    await db.query('SAVEPOINT sp');
    await db.query('COMMIT');
    expect((await db.query("SELECT v FROM t WHERE id='x'") as Array<{ v: number }>)[0].v).toBe(9);

    await db.query('BEGIN');
    await db.query("UPDATE t SET v = 5 WHERE id='x'");
    // 上一事务的 savepoint 随事务结束失效
    await expect(db.query('ROLLBACK TO sp')).rejects.toMatchObject({ code: 'SAVEPOINT_NOT_FOUND' });
    await db.query('COMMIT');
    // 关键：本事务的写入必须保留（此前会被旧快照静默替换回 9）
    expect((await db.query("SELECT v FROM t WHERE id='x'") as Array<{ v: number }>)[0].v).toBe(5);
    await db.close();
  });
});

describe('[v0.8.0] A3 savepoint 回滚的崩溃一致性', () => {
  /** kv 后端介质按库名存于全局注册表且 close 不清数据 → 新引擎 open 同名库 = 崩溃重启 */
  const CFG = { storageBackend: 'kv' as const, walSyncMode: 'full' as const, checkpointInterval: 999999 };

  test('回滚到保存点后提交：崩溃重放不得复活已回滚的行', async () => {
    const eng = new AriaEngine(CFG) as unknown as {
      open(n: string, v: number): Promise<void>;
      createTable(s: unknown): Promise<void>;
      beginTransaction(): Promise<void>;
      insert(t: string, r: unknown[]): Promise<unknown>;
      savepoint(n: string): Promise<void>;
      rollbackToSavepoint(n: string): Promise<void>;
      commitTransaction(): Promise<void>;
      find(t: string, q: unknown): Promise<Array<Record<string, unknown>>>;
      close(): Promise<void>;
    };
    await eng.open('v080-sp-crash', 1);
    await eng.createTable({ name: 't', columns: { id: { type: 'string', primaryKey: true } } });
    await eng.beginTransaction();
    await eng.insert('t', [{ id: 'a' }]);
    await eng.savepoint('s');
    await eng.insert('t', [{ id: 'b' }]);
    await eng.rollbackToSavepoint('s');
    await eng.commitTransaction();
    const live = (await eng.find('t', { table: 't' })).map((r) => r.id).sort();

    // 崩溃：不调用 close()（close 会 checkpoint 截断 WAL，掩盖重放路径）
    const eng2 = new AriaEngine(CFG) as unknown as typeof eng;
    await eng2.open('v080-sp-crash', 1);
    const after = (await eng2.find('t', { table: 't' })).map((r) => r.id).sort();

    expect(live).toEqual(['a']);
    expect(after).toEqual(live); // 不得复活 b
    await eng2.close();
  });

  test('无 savepoint 的普通事务崩溃重放仍然完整（不得误伤）', async () => {
    const eng = new AriaEngine(CFG) as unknown as {
      open(n: string, v: number): Promise<void>;
      createTable(s: unknown): Promise<void>;
      beginTransaction(): Promise<void>;
      insert(t: string, r: unknown[]): Promise<unknown>;
      commitTransaction(): Promise<void>;
      find(t: string, q: unknown): Promise<Array<Record<string, unknown>>>;
      close(): Promise<void>;
    };
    await eng.open('v080-sp-crash2', 1);
    await eng.createTable({ name: 't', columns: { id: { type: 'string', primaryKey: true } } });
    await eng.beginTransaction();
    await eng.insert('t', [{ id: 'a' }]);
    await eng.insert('t', [{ id: 'b' }]);
    await eng.commitTransaction();
    const live = (await eng.find('t', { table: 't' })).map((r) => r.id).sort();

    const eng2 = new AriaEngine(CFG) as unknown as typeof eng;
    await eng2.open('v080-sp-crash2', 1);
    const after = (await eng2.find('t', { table: 't' })).map((r) => r.id).sort();
    expect(live).toEqual(['a', 'b']);
    expect(after).toEqual(live);
    await eng2.close();
  });

  test('多个保存点：回到最早保存点，其后写入全部丢弃', async () => {
    const eng = new AriaEngine(CFG) as unknown as {
      open(n: string, v: number): Promise<void>;
      createTable(s: unknown): Promise<void>;
      beginTransaction(): Promise<void>;
      insert(t: string, r: unknown[]): Promise<unknown>;
      savepoint(n: string): Promise<void>;
      rollbackToSavepoint(n: string): Promise<void>;
      commitTransaction(): Promise<void>;
      find(t: string, q: unknown): Promise<Array<Record<string, unknown>>>;
      close(): Promise<void>;
    };
    await eng.open('v080-sp-multi', 1);
    await eng.createTable({ name: 't', columns: { id: { type: 'string', primaryKey: true } } });
    await eng.beginTransaction();
    await eng.insert('t', [{ id: 'a' }]);
    await eng.savepoint('s1');
    await eng.insert('t', [{ id: 'b' }]);
    await eng.savepoint('s2');
    await eng.insert('t', [{ id: 'c' }]);
    await eng.rollbackToSavepoint('s1');
    await eng.commitTransaction();
    const live = (await eng.find('t', { table: 't' })).map((r) => r.id).sort();

    const eng2 = new AriaEngine(CFG) as unknown as typeof eng;
    await eng2.open('v080-sp-multi', 1);
    const after = (await eng2.find('t', { table: 't' })).map((r) => r.id).sort();

    expect(live).toEqual(['a']);
    expect(after).toEqual(['a']);
    await eng2.close();
  });
});