/**
 * v0.6.1-fix(P0) — 二级索引大数据量完整性回归测试
 *
 * 覆盖两类根因：
 * 1. LSM.put 的 `!this.flushing` 条件竞态（修复：每次 freeze 一律挂链）
 * 2. SSTable rangeScan 尾块漏读（索引键为块尾 key，locateBlockLE 排除
 *    尾 key 越界的下一块 → 范围扫描丢尾部数据；修复：endBlockIdx 多扫一块）
 */
import { AriaEngine } from '../../src/engine/aria/index';
import { createSchema } from '../../src/table/schema';
import { installOPFSMock } from '../helpers/opfs-mock';

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

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

describe('AriaEngine — 二级索引完整性（P0 回归）', () => {
  it('5 万行写入：索引查询与主表一致（修复前丢 106~771 条）', async () => {
    const engine = new AriaEngine({
      storageBackend: 'opfs',
      memtableSizeThreshold: 256 * 1024,
      checkpointInterval: 2000,
      walSyncMode: 'full',
    });
    await engine.open(uniqueDB(), 1);
    await engine.createTable(createSchema('big', {
      id: { type: 'string', primaryKey: true },
      val: { type: 'number' },
      tag: { type: 'string', index: true },
      name: { type: 'string' },
    }));

    const TOTAL = 50000;
    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}`, name: `User${idx}` });
      }
      await engine.insert('big', rows);
    }

    expect(await engine.count('big')).toBe(TOTAL);

    // 每个 tag 的索引查询都完整（修复前丢 106-771 条）
    for (let t = 0; t < 10; t++) {
      const viaIdx = await engine.find('big', { table: 'big', where: { tag: `t${t}` } });
      expect(viaIdx.length).toBe(5000);
    }

    // 崩溃恢复后索引仍完整
    await (engine as any).backend.close();
    (engine as any).opened = false;
    const engine2 = new AriaEngine({
      storageBackend: 'opfs',
      memtableSizeThreshold: 256 * 1024,
      checkpointInterval: 2000,
      walSyncMode: 'full',
    });
    await engine2.open((engine as any).dbName, 1);
    for (let t = 0; t < 10; t++) {
      const viaIdx = await engine2.find('big', { table: 'big', where: { tag: `t${t}` } });
      expect(viaIdx.length).toBe(5000);
    }
    await engine2.close();
  }, 180000);

  it('小批量高频写入（每批 50 行）触发极端 freeze 竞态', async () => {
    const engine = new AriaEngine({
      storageBackend: 'opfs',
      memtableSizeThreshold: 32 * 1024,
      checkpointInterval: 5000,
      walSyncMode: 'full',
    });
    await engine.open(uniqueDB(), 1);
    await engine.createTable(createSchema('items', {
      id: { type: 'string', primaryKey: true },
      tag: { type: 'string', index: true },
    }));

    const TOTAL = 4000;
    for (let i = 0; i < TOTAL; i++) {
      await engine.insert('items', [{ id: `k${i}`, tag: i % 3 === 0 ? 'a' : 'b' }]);
    }
    expect(await engine.count('items')).toBe(TOTAL);
    expect(await engine.find('items', { table: 'items', where: { tag: 'a' } })).toHaveLength(Math.ceil(TOTAL / 3));
    expect(await engine.find('items', { table: 'items', where: { tag: 'b' } })).toHaveLength(TOTAL - Math.ceil(TOTAL / 3));
    await engine.close();
  }, 120000);

  it('多索引列同时写入：每列索引都完整', async () => {
    const engine = new AriaEngine({
      storageBackend: 'opfs',
      memtableSizeThreshold: 64 * 1024,
      checkpointInterval: 5000,
      walSyncMode: 'full',
    });
    await engine.open(uniqueDB(), 1);
    await engine.createTable(createSchema('multi', {
      id: { type: 'string', primaryKey: true },
      cat: { type: 'string', index: true },
      grp: { type: 'number', index: true },
    }));

    const TOTAL = 6000;
    for (let batch = 0; batch < TOTAL / 100; batch++) {
      const rows = [] as Record<string, unknown>[];
      for (let i = 0; i < 100; i++) {
        const idx = batch * 100 + i;
        rows.push({ id: `k${idx}`, cat: idx % 2 === 0 ? 'even' : 'odd', grp: idx % 5 });
      }
      await engine.insert('multi', rows);
    }
    expect(await engine.find('multi', { table: 'multi', where: { cat: 'even' } })).toHaveLength(TOTAL / 2);
    expect(await engine.find('multi', { table: 'multi', where: { cat: 'odd' } })).toHaveLength(TOTAL / 2);
    expect(await engine.find('multi', { table: 'multi', where: { grp: 0 } })).toHaveLength(TOTAL / 5);
    expect(await engine.find('multi', { table: 'multi', where: { grp: 4 } })).toHaveLength(TOTAL / 5);
    await engine.close();
  }, 120000);
});