/**
 * ledgerStore reset 与 lockGeneration 守卫测试。
 * 验证 #1/#2 修复：reset() 递增 lockGeneration，addTransaction 中 gen 守卫生效。
 */
import { describe, expect, it, beforeEach, vi } from 'vitest';

// ledgerStore 间接依赖 txKeyStore → expo-file-system，mock 掉避免 react-native flow 语法解析失败
vi.mock('expo-file-system/legacy', () => ({
  documentDirectory: '',
  getInfoAsync: vi.fn().mockResolvedValue({ exists: false }),
  readAsStringAsync: vi.fn().mockResolvedValue('[]'),
  writeAsStringAsync: vi.fn().mockResolvedValue(undefined),
  moveAsync: vi.fn().mockResolvedValue(undefined),
}));

import { useLedgerStore } from '../src/store/ledgerStore';
import { MemoryBackend } from '../src/domain/platform/mobileStore';
import type { LedgerFile } from '../src/domain/core/types';

const sampleLedger: LedgerFile = {
  path: 'main.bean',
  content: `option "operating_currency" "CNY"
2026-01-01 open Assets:Alipay CNY
2026-01-01 open Expenses:Food CNY
include "mobile.bean"
`,
};

beforeEach(() => {
  useLedgerStore.getState().reset();
});

describe('ledgerStore reset 与 lockGeneration', () => {
  it('reset 后状态清空', () => {
    const state = useLedgerStore.getState();
    expect(state.ledger).toBeNull();
    expect(state.mobileStore).toBeNull();
    expect(state.mobileBean).toBe('');
    expect(state.isLoading).toBe(false);
    expect(state.error).toBeNull();
  });

  it('reset 后重新 loadLedger 正常工作', async () => {
    await useLedgerStore.getState().loadLedger([sampleLedger], new MemoryBackend());
    expect(useLedgerStore.getState().ledger).not.toBeNull();

    useLedgerStore.getState().reset();
    expect(useLedgerStore.getState().ledger).toBeNull();

    // 重新加载
    await useLedgerStore.getState().loadLedger([sampleLedger], new MemoryBackend());
    expect(useLedgerStore.getState().ledger).not.toBeNull();
    expect(useLedgerStore.getState().ledger?.transactions).toBeDefined();
  });

  it('reset 后 addTransaction 使用新的 mobileStore', async () => {
    const backend1 = new MemoryBackend();
    await useLedgerStore.getState().loadLedger([sampleLedger], backend1);
    const store1 = useLedgerStore.getState().mobileStore;

    useLedgerStore.getState().reset();

    const backend2 = new MemoryBackend();
    await useLedgerStore.getState().loadLedger([sampleLedger], backend2);
    const store2 = useLedgerStore.getState().mobileStore;

    // 两个 store 应该是不同的实例
    expect(store1).not.toBe(store2);
  });

  it('并发 addTransaction 串行化执行', async () => {
    await useLedgerStore.getState().loadLedger([sampleLedger], new MemoryBackend());

    const draft1 = {
      date: '2026-07-01',
      payee: '商户A',
      narration: '交易1',
      postings: [
        { account: 'Assets:Alipay', amount: '-100', currency: 'CNY' },
        { account: 'Expenses:Food', amount: '100', currency: 'CNY' },
      ],
    };

    const draft2 = {
      date: '2026-07-02',
      payee: '商户B',
      narration: '交易2',
      postings: [
        { account: 'Assets:Alipay', amount: '-200', currency: 'CNY' },
        { account: 'Expenses:Food', amount: '200', currency: 'CNY' },
      ],
    };

    // 并发执行两个 addTransaction
    const [result1, result2] = await Promise.all([
      useLedgerStore.getState().addTransaction(draft1),
      useLedgerStore.getState().addTransaction(draft2),
    ]);

    // MobileCommit 返回 content/diff，不包含 success 字段
    expect(result1.content).toBeDefined();
    expect(result2.content).toBeDefined();

    // 两笔交易都应该入账
    const bean = useLedgerStore.getState().mobileBean;
    expect(bean).toContain('商户A');
    expect(bean).toContain('商户B');
  });

  it('reset 后 addTransaction 报错（账本未加载）', async () => {
    await useLedgerStore.getState().loadLedger([sampleLedger], new MemoryBackend());

    const draft = {
      date: '2026-07-01',
      payee: '测试商户',
      narration: '测试交易',
      postings: [
        { account: 'Assets:Alipay', amount: '-50', currency: 'CNY' },
        { account: 'Expenses:Food', amount: '50', currency: 'CNY' },
      ],
    };

    // reset 后状态清空
    useLedgerStore.getState().reset();

    // 此时 addTransaction 应该报错
    await expect(useLedgerStore.getState().addTransaction(draft)).rejects.toThrow('账本未加载');
  });
});