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

// Mock @tarojs/taro
vi.mock('@tarojs/taro', () => ({
  default: {
    request: vi.fn(),
    getStorageSync: vi.fn(() => ''),
    setStorageSync: vi.fn(),
    showToast: vi.fn(),
    reLaunch: vi.fn(() => Promise.resolve()),
    getCurrentPages: vi.fn(() => []),
  },
}));

// Mock secure-storage to use simple values
vi.mock('@/utils/secure-storage', () => ({
  secureGet: vi.fn((key: string) => {
    const store: Record<string, string> = { access_token: 'test-token', tenant_id: 'test-tenant' };
    return store[key] || '';
  }),
  secureSet: vi.fn(),
  secureRemove: vi.fn(),
}));

import Taro from '@tarojs/taro';
import { api, clearRequestCache, resetForTesting, setCachedPatientId } from '@/services/request';

describe('request module', () => {
  beforeEach(() => {
    vi.clearAllMocks();
    resetForTesting();
  });

  describe('api.get', () => {
    it('should call Taro.request with correct method and url', async () => {
      const mockData = { success: true, data: { items: [] } };
      vi.mocked(Taro.request).mockResolvedValue({ statusCode: 200, data: mockData } as any);

      const result = await api.get('/health/patients', { page: 1 });

      expect(Taro.request).toHaveBeenCalledWith(
        expect.objectContaining({
          url: expect.stringContaining('/health/patients?page=1'),
          method: 'GET',
        }),
      );
    });

    it('should build query string from params', async () => {
      vi.mocked(Taro.request).mockResolvedValue({ statusCode: 200, data: { success: true, data: null } } as any);

      await api.get('/test', { foo: 'bar', baz: 42 });

      const call = vi.mocked(Taro.request).mock.calls[0][0];
      expect(call.url).toContain('foo=bar');
      expect(call.url).toContain('baz=42');
    });

    it('should skip undefined and empty params', async () => {
      vi.mocked(Taro.request).mockResolvedValue({ statusCode: 200, data: { success: true, data: null } } as any);

      await api.get('/test', { foo: 'bar', empty: '', missing: undefined });

      const call = vi.mocked(Taro.request).mock.calls[0][0];
      expect(call.url).toContain('foo=bar');
      expect(call.url).not.toContain('empty');
      expect(call.url).not.toContain('missing');
    });

    it('should cache GET responses', async () => {
      vi.mocked(Taro.request).mockResolvedValue({ statusCode: 200, data: { success: true, data: { id: '1' } } } as any);

      const r1 = await api.get('/cached');
      const r2 = await api.get('/cached');

      expect(Taro.request).toHaveBeenCalledTimes(1);
      expect(r1).toEqual(r2);
    });
  });

  describe('api.post', () => {
    it('should send POST with body', async () => {
      vi.mocked(Taro.request).mockResolvedValue({ statusCode: 200, data: { success: true, data: { id: 'new' } } } as any);

      await api.post('/health/patients', { name: 'Test' });

      expect(Taro.request).toHaveBeenCalledWith(
        expect.objectContaining({
          method: 'POST',
          data: { name: 'Test' },
        }),
      );
    });
  });

  describe('api.put', () => {
    it('should send PUT with body', async () => {
      vi.mocked(Taro.request).mockResolvedValue({ statusCode: 200, data: { success: true, data: {} } } as any);

      await api.put('/health/patients/p1', { name: 'Updated', version: 1 });

      expect(Taro.request).toHaveBeenCalledWith(
        expect.objectContaining({
          method: 'PUT',
          data: { name: 'Updated', version: 1 },
        }),
      );
    });
  });

  describe('api.delete', () => {
    it('should send DELETE request', async () => {
      vi.mocked(Taro.request).mockResolvedValue({ statusCode: 200, data: { success: true, data: null } } as any);

      await api.delete('/health/patients/p1');

      expect(Taro.request).toHaveBeenCalledWith(
        expect.objectContaining({ method: 'DELETE' }),
      );
    });
  });

  describe('error handling', () => {
    it('should throw on 403 with permission error', async () => {
      vi.mocked(Taro.request).mockResolvedValue({ statusCode: 403, data: {} } as any);

      await expect(api.get('/forbidden')).rejects.toThrow('权限不足');
    });

    it('should throw on 500 with server error', async () => {
      vi.mocked(Taro.request).mockResolvedValue({ statusCode: 500, data: {} } as any);

      await expect(api.get('/error')).rejects.toThrow('服务器错误');
    });

    it('should throw on network error', async () => {
      vi.mocked(Taro.request).mockRejectedValue({ errMsg: 'request:fail timeout' });

      await expect(api.get('/timeout')).rejects.toThrow('网络超时');
    });

    it('should throw on API failure with message', async () => {
      vi.mocked(Taro.request).mockResolvedValue({
        statusCode: 200,
        data: { success: false, message: '参数错误' },
      } as any);

      await expect(api.get('/bad-params')).rejects.toThrow('参数错误');
    });
  });

  describe('ResponseCache', () => {
    it('should cache GET responses and return cached on second call', async () => {
      vi.mocked(Taro.request).mockResolvedValue({ statusCode: 200, data: { success: true, data: { id: '1' } } } as any);

      await api.get('/cached-test');
      await api.get('/cached-test');

      expect(Taro.request).toHaveBeenCalledTimes(1);
    });

    it('should not cache POST requests', async () => {
      vi.mocked(Taro.request).mockResolvedValue({ statusCode: 200, data: { success: true, data: {} } } as any);

      await api.post('/no-cache', { a: 1 });
      await api.post('/no-cache', { a: 1 });

      expect(Taro.request).toHaveBeenCalledTimes(2);
    });

    it('clearRequestCache should clear cached entries', async () => {
      vi.mocked(Taro.request).mockResolvedValue({ statusCode: 200, data: { success: true, data: { v: 1 } } } as any);

      await api.get('/clear-test');
      clearRequestCache();
      await api.get('/clear-test');

      expect(Taro.request).toHaveBeenCalledTimes(2);
    });
  });

  describe('setCachedPatientId', () => {
    it('should isolate cache entries by patient ID', async () => {
      vi.mocked(Taro.request).mockResolvedValue({ statusCode: 200, data: { success: true, data: { v: 1 } } } as any);
      setCachedPatientId('patient-A');
      await api.get('/health/data');

      setCachedPatientId('patient-B');
      await api.get('/health/data');

      // 不同 patient ID 应各自发请求（缓存隔离）
      expect(Taro.request).toHaveBeenCalledTimes(2);
    });
  });

  describe('requestUnlimited', () => {
    it('should bypass concurrency limiter', async () => {
      vi.mocked(Taro.request).mockResolvedValue({ statusCode: 200, data: { success: true, data: 'ok' } } as any);

      const { requestUnlimited } = await import('@/services/request');
      await requestUnlimited('GET', '/health/test');

      expect(Taro.request).toHaveBeenCalledWith(
        expect.objectContaining({ method: 'GET' }),
      );
    });
  });

  describe('ConcurrencyLimiter', () => {
    it('should queue requests when at capacity', async () => {
      const { ConcurrencyLimiter } = await import('@/services/request/limiter');
      const limiter = new ConcurrencyLimiter(2);
      const order: number[] = [];

      const acquire1 = limiter.acquire();
      const acquire2 = limiter.acquire();
      // Third acquire should queue
      const acquire3 = limiter.acquire().then(() => order.push(3));

      order.push(1);
      order.push(2);

      // Release one to unblock the third
      limiter.release();
      await acquire3;

      expect(order).toContain(3);
      limiter.release();
      limiter.release();
    });

    it('should release in FIFO order', async () => {
      const { ConcurrencyLimiter } = await import('@/services/request/limiter');
      const limiter = new ConcurrencyLimiter(1);
      const order: string[] = [];

      await limiter.acquire(); // fills the slot

      const p2 = limiter.acquire().then(() => order.push('second'));
      const p3 = limiter.acquire().then(() => order.push('third'));

      limiter.release(); // releases second
      await p2;
      limiter.release(); // releases third
      await p3;

      expect(order).toEqual(['second', 'third']);
    });
  });

  describe('ResponseCache LRU', () => {
    it('should update insertion order on cache hit', async () => {
      const { ResponseCache } = await import('@/services/request/cache');
      const cache = new ResponseCache(3, 60_000);
      cache.setPatientId('p1');

      cache.set('/a', 'data-a');
      cache.set('/b', 'data-b');
      cache.set('/c', 'data-c');

      // Access /a to move it to the end (most recently used)
      cache.get('/a');

      // Adding /d should evict /b (oldest after /a was accessed)
      cache.set('/d', 'data-d');

      expect(cache.get('/b')).toBeNull();
      expect(cache.get('/a')).toBe('data-a');
      expect(cache.get('/d')).toBe('data-d');
    });

    it('should expire entries based on TTL', async () => {
      const { ResponseCache } = await import('@/services/request/cache');
      vi.useFakeTimers();
      const cache = new ResponseCache(100, 1000);
      cache.setPatientId('p1');

      cache.set('/expiring', 'data', 500);
      expect(cache.get('/expiring')).toBe('data');

      vi.advanceTimersByTime(600);
      expect(cache.get('/expiring')).toBeNull();

      vi.useRealTimers();
    });
  });

  describe('token refresh & 401 retry', () => {
    it('should throw immediately when isLoggingOut is true', async () => {
      const { markLoggingOut } = await import('@/services/request');
      vi.mocked(Taro.request).mockResolvedValue({ statusCode: 401, data: {} } as any);

      markLoggingOut();
      await expect(api.get('/protected')).rejects.toThrow('登录已过期');
    });

    it('should attempt token refresh on 401', async () => {
      const mockStore: Record<string, string> = {
        access_token: 'expired-token',
        refresh_token: 'valid-refresh',
        tenant_id: 'test-tenant',
      };

      // Override secureGet for this test
      const { secureGet } = await import('@/utils/secure-storage');
      vi.mocked(secureGet).mockImplementation((key: string) => mockStore[key] || '');

      // First call: 401 → triggers refresh
      // Refresh call: success
      // Retry call: success
      vi.mocked(Taro.request)
        .mockResolvedValueOnce({ statusCode: 401, data: {} } as any)
        .mockResolvedValueOnce({ statusCode: 200, data: { success: true, data: { access_token: 'new-token', refresh_token: 'new-refresh', expires_in: 3600 } } } as any)
        .mockResolvedValueOnce({ statusCode: 200, data: { success: true, data: { result: 'ok' } } } as any);

      const result = await api.get('/needs-auth');

      expect(result).toEqual({ result: 'ok' });
      // 3 calls: initial 401 + refresh + retry
      expect(Taro.request).toHaveBeenCalledTimes(3);
    });

    it('should redirect to login when refresh fails', async () => {
      const mockStore: Record<string, string> = {
        access_token: 'expired-token',
        refresh_token: 'bad-refresh',
        tenant_id: 'test-tenant',
      };

      const { secureGet } = await import('@/utils/secure-storage');
      vi.mocked(secureGet).mockImplementation((key: string) => mockStore[key] || '');
      vi.mocked(Taro.getCurrentPages).mockReturnValue([{ path: 'pages/home' } as any]);

      vi.mocked(Taro.request)
        .mockResolvedValueOnce({ statusCode: 401, data: {} } as any)
        .mockResolvedValueOnce({ statusCode: 401, data: {} } as any); // refresh fails

      await expect(api.get('/protected-resource')).rejects.toThrow('登录已过期');
      expect(Taro.reLaunch).toHaveBeenCalledWith({ url: '/pages/login/index' });
    });
  });

  describe('safeReLaunch dedup', () => {
    it('should only call reLaunch once for concurrent requests', async () => {
      const { markLoggingOut } = await import('@/services/request');
      vi.mocked(Taro.request).mockResolvedValue({ statusCode: 401, data: {} } as any);
      vi.mocked(Taro.getCurrentPages).mockReturnValue([{ path: 'pages/home' } as any]);

      const mockStore: Record<string, string> = {
        access_token: 'expired',
        refresh_token: 'bad',
        tenant_id: 't1',
      };
      const { secureGet } = await import('@/utils/secure-storage');
      vi.mocked(secureGet).mockImplementation((key: string) => mockStore[key] || '');

      // First call sets isLoggingOut, second call hits early exit
      await expect(api.get('/test1')).rejects.toThrow();
      await expect(api.get('/test2')).rejects.toThrow();

      // reLaunch should be called at most once
      expect(vi.mocked(Taro.reLaunch).mock.calls.length).toBeLessThanOrEqual(1);
    });
  });
});