import { describe, expect, it, beforeEach, vi } from 'vitest';

// ledgerStore/importStore 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 { useImportStore } from '../src/store/importStore';
import { useSettingsStore } from '../src/store/settingsStore';
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
2026-01-01 open Expenses:Uncategorized CNY
2026-01-01 open Income:Uncategorized CNY
include "mobile.bean"
`,
};

const sampleStatement = '交易时间,金额(元),收/支,交易对方,商品说明,交易订单号\n2026-07-01,24.50,支出,咖啡店,冰美式,ORDER-1\n2026-07-02,5000,收入,公司,工资,ORDER-2';

// 每个测试前重置 store（zustand 单例需手动重置）
beforeEach(() => {
  useLedgerStore.getState().reset();
  useImportStore.getState().clear();
  useSettingsStore.getState().hydrate({});
});

describe('ledgerStore', () => {
  it('loadLedger 解析账本并初始化 mobile.bean 存储', async () => {
    await useLedgerStore.getState().loadLedger([sampleLedger], new MemoryBackend());
    const state = useLedgerStore.getState();
    expect(state.ledger).not.toBeNull();
    expect(state.ledger!.accounts.size).toBe(4);
    expect(state.mobileBean).toContain('include "mobile.bean"');
    expect(state.error).toBeNull();
  });

  it('addTransaction 写入 mobile.bean（并发安全）', async () => {
    await useLedgerStore.getState().loadLedger([sampleLedger], new MemoryBackend());
    const commit = await useLedgerStore.getState().addTransaction({
      date: '2026-07-10', narration: '午餐',
      postings: [{ account: 'Assets:Alipay', amount: '-20', currency: 'CNY' }, { account: 'Expenses:Food', amount: '20', currency: 'CNY' }],
    });
    expect(commit.content).toContain('午餐');
    expect(useLedgerStore.getState().mobileBean).toContain('午餐');
  });

  // 回归：用户反馈"添加交易后最近交易还是 0"。
  // 根因：addTransaction 只更新了 mobileBean 字符串，未重新解析 ledger.transactions。
  // parseLedger 不解析 include 指令，需把 mobile.bean 作为额外文件传入。
  it('addTransaction 后 ledger.transactions 包含新交易', async () => {
    await useLedgerStore.getState().loadLedger([sampleLedger], new MemoryBackend());
    expect(useLedgerStore.getState().ledger!.transactions).toHaveLength(0);

    await useLedgerStore.getState().addTransaction({
      date: '2026-07-10', narration: '午餐',
      postings: [{ account: 'Assets:Alipay', amount: '-20', currency: 'CNY' }, { account: 'Expenses:Food', amount: '20', currency: 'CNY' }],
    });

    const txns = useLedgerStore.getState().ledger!.transactions;
    expect(txns).toHaveLength(1);
    expect(txns[0].narration).toBe('午餐');
    expect(txns[0].postings).toHaveLength(2);
  });

  it('addTransaction 多笔后 ledger.transactions 全部可见', async () => {
    await useLedgerStore.getState().loadLedger([sampleLedger], new MemoryBackend());
    for (const n of [1, 2, 3]) {
      await useLedgerStore.getState().addTransaction({
        date: '2026-07-10', narration: `t${n}`,
        postings: [{ account: 'Assets:Alipay', amount: `-${n}`, currency: 'CNY' }, { account: 'Expenses:Food', amount: `${n}`, currency: 'CNY' }],
      });
    }
    const txns = useLedgerStore.getState().ledger!.transactions;
    expect(txns).toHaveLength(3);
    expect(txns.map(t => t.narration).sort()).toEqual(['t1', 't2', 't3']);
  });

  it('replaceMobileBean 后 ledger.transactions 同步更新', async () => {
    await useLedgerStore.getState().loadLedger([sampleLedger], new MemoryBackend());
    await useLedgerStore.getState().replaceMobileBean(
      '2026-07-10 * "导入交易"\n  Assets:Alipay  -50 CNY\n  Expenses:Food\n',
    );
    const txns = useLedgerStore.getState().ledger!.transactions;
    expect(txns).toHaveLength(1);
    expect(txns[0].narration).toBe('导入交易');
  });

  it('addTransaction 多笔并发不丢失', async () => {
    await useLedgerStore.getState().loadLedger([sampleLedger], new MemoryBackend());
    await Promise.all([1, 2, 3].map(n =>
      useLedgerStore.getState().addTransaction({
        date: '2026-07-10', narration: `t${n}`,
        postings: [{ account: 'Assets:Alipay', amount: `-${n}`, currency: 'CNY' }, { account: 'Expenses:Food', amount: `${n}`, currency: 'CNY' }],
      }),
    ));
    const content = useLedgerStore.getState().mobileBean;
    expect(content).toContain('t1');
    expect(content).toContain('t2');
    expect(content).toContain('t3');
  });

  it('未加载账本时 addTransaction 抛错', async () => {
    await expect(useLedgerStore.getState().addTransaction({
      date: '2026-07-10', narration: 'x',
      postings: [{ account: 'A', amount: '-1', currency: 'CNY' }, { account: 'B', amount: '1', currency: 'CNY' }],
    })).rejects.toThrow('账本未加载');
  });

  it('不平衡交易 addTransaction 抛错并设置 error', async () => {
    await useLedgerStore.getState().loadLedger([sampleLedger], new MemoryBackend());
    await expect(useLedgerStore.getState().addTransaction({
      date: '2026-07-10', narration: '错误',
      postings: [{ account: 'Assets:Alipay', amount: '-1', currency: 'CNY' }, { account: 'Expenses:Food', amount: '0.9', currency: 'CNY' }],
    })).rejects.toThrow();
  });

  it('replaceMobileBean 直接替换内容', async () => {
    await useLedgerStore.getState().loadLedger([sampleLedger], new MemoryBackend());
    await useLedgerStore.getState().replaceMobileBean('REPLACED');
    expect(useLedgerStore.getState().mobileBean).toBe('REPLACED');
  });

  it('refresh 重新解析账本', async () => {
    await useLedgerStore.getState().loadLedger([sampleLedger], new MemoryBackend());
    // refresh 不改变账户数（文件未变）
    await useLedgerStore.getState().refresh();
    expect(useLedgerStore.getState().ledger!.accounts.size).toBe(4);
  });

  it('reset 回到初始状态', async () => {
    await useLedgerStore.getState().loadLedger([sampleLedger], new MemoryBackend());
    useLedgerStore.getState().reset();
    const state = useLedgerStore.getState();
    expect(state.ledger).toBeNull();
    expect(state.mobileStore).toBeNull();
    expect(state.mobileBean).toBe('');
  });
});

describe('importStore', () => {
  beforeEach(async () => {
    await useLedgerStore.getState().loadLedger([sampleLedger], new MemoryBackend());
  });

  it('setContext 设置规则/分类', () => {
    useImportStore.getState().setContext({
      rules: [{ id: 'r1', priority: 10, counterpartyContains: '咖啡', sourceAccount: 'Assets:Alipay', categoryAccount: 'Expenses:Food', hits: 0 }],
    });
    expect(useImportStore.getState().rules).toHaveLength(1);
  });

  it('importCsv 生成事件', () => {
    const events = useImportStore.getState().importCsv(sampleStatement, 'alipay-csv-v1');
    expect(events).toHaveLength(2);
    expect(useImportStore.getState().events).toHaveLength(2);
  });

  it('process 走 BillPipeline 生成草稿', async () => {
    useImportStore.getState().importCsv(sampleStatement, 'alipay-csv-v1');
    const ledger = useLedgerStore.getState().ledger!;
    const result = await useImportStore.getState().process(ledger, []);
    expect(result.drafts.length).toBeGreaterThan(0);
    expect(useImportStore.getState().pendingDrafts.length).toBeGreaterThan(0);
  });

  it('confirmDraft 移除已确认草稿并返回它', async () => {
    useImportStore.getState().importCsv(sampleStatement, 'alipay-csv-v1');
    const ledger = useLedgerStore.getState().ledger!;
    await useImportStore.getState().process(ledger, []);
    const before = useImportStore.getState().pendingDrafts.length;
    const confirmed = useImportStore.getState().confirmDraft(0);
    expect(confirmed).not.toBeNull();
    expect(useImportStore.getState().pendingDrafts.length).toBe(before - 1);
  });

  it('rejectDraft 移除草稿', async () => {
    useImportStore.getState().importCsv(sampleStatement, 'alipay-csv-v1');
    const ledger = useLedgerStore.getState().ledger!;
    await useImportStore.getState().process(ledger, []);
    const before = useImportStore.getState().pendingDrafts.length;
    useImportStore.getState().rejectDraft(0);
    expect(useImportStore.getState().pendingDrafts.length).toBe(before - 1);
  });

  it('clear 清空本次导入', async () => {
    useImportStore.getState().importCsv(sampleStatement, 'alipay-csv-v1');
    const ledger = useLedgerStore.getState().ledger!;
    await useImportStore.getState().process(ledger, []);
    useImportStore.getState().clear();
    expect(useImportStore.getState().events).toHaveLength(0);
    expect(useImportStore.getState().pendingDrafts).toHaveLength(0);
  });
});

describe('settingsStore', () => {
  it('默认值正确', () => {
    const s = useSettingsStore.getState();
    expect(s.dedupEnabled).toBe(true);
    expect(s.transferRecognitionEnabled).toBe(true);
    expect(s.themeMode).toBe('system');
    expect(s.locale).toBe('zh');
    expect(s.appLockEnabled).toBe(false);
  });

  it('updateDedupConfig 局部更新', () => {
    useSettingsStore.getState().updateDedupConfig({ timeWindowMinutes: 10 });
    expect(useSettingsStore.getState().dedupConfig.timeWindowMinutes).toBe(10);
    expect(useSettingsStore.getState().dedupConfig.checkAccountLink).toBe(true);  // 其他字段保留
  });

  it('updateTransferConfig 局部更新', () => {
    useSettingsStore.getState().updateTransferConfig({ timeWindowHours: 48 });
    expect(useSettingsStore.getState().transferConfig.timeWindowHours).toBe(48);
  });

  it('setThemeMode / setLocale / setAppLockEnabled', () => {
    useSettingsStore.getState().setThemeMode('dark');
    useSettingsStore.getState().setLocale('en');
    useSettingsStore.getState().setAppLockEnabled(true);
    const s = useSettingsStore.getState();
    expect(s.themeMode).toBe('dark');
    expect(s.locale).toBe('en');
    expect(s.appLockEnabled).toBe(true);
  });

  it('persistTo 钩子在状态变更后被调用', () => {
    // 使用 store 的 subscribe 来验证状态变更通知
    const changes: string[] = [];
    const unsub = useSettingsStore.subscribe((state, prevState) => {
      if (state !== prevState) {
        changes.push(state.themeMode);
      }
    });
    useSettingsStore.getState().setThemeMode('dark');
    expect(changes).toHaveLength(1);
    expect(changes[0]).toBe('dark');
    unsub();
  });

  it('hydrate 从持久化源恢复', () => {
    useSettingsStore.getState().hydrate({ themeMode: 'dark', locale: 'en', appLockEnabled: true });
    const s = useSettingsStore.getState();
    expect(s.themeMode).toBe('dark');
    expect(s.locale).toBe('en');
    expect(s.appLockEnabled).toBe(true);
    // 未提供的字段用默认值
    expect(s.dedupEnabled).toBe(true);
  });
});
