import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest'
import axios from 'axios'
import type { AxiosInstance, InternalAxiosRequestConfig, AxiosResponse, AxiosHeaders } from 'axios'

// 需要在导入 client 之前设置 mock
vi.mock('@/i18n', () => ({
  getLocale: () => 'zh-CN',
}))

describe('API Client', () => {
  let apiClient: AxiosInstance

  beforeEach(async () => {
    localStorage.clear()
    // 每次测试重新导入以获取干净的模块状态
    vi.resetModules()
    const mod = await import('@/api/client')
    apiClient = mod.apiClient
  })

  afterEach(() => {
    vi.restoreAllMocks()
  })

  // --- 请求拦截器 ---

  describe('请求拦截器', () => {
    it('自动附加 Authorization 头', async () => {
      localStorage.setItem('auth_token', 'my-jwt-token')

      // 拦截实际请求
      const adapter = vi.fn().mockResolvedValue({
        status: 200,
        data: { code: 0, data: {} },
        headers: {},
        config: {},
        statusText: 'OK',
      })
      apiClient.defaults.adapter = adapter

      await apiClient.get('/test')

      const config = adapter.mock.calls[0][0]
      expect(config.headers.get('Authorization')).toBe('Bearer my-jwt-token')
    })

    it('无 token 时不附加 Authorization 头', async () => {
      const adapter = vi.fn().mockResolvedValue({
        status: 200,
        data: { code: 0, data: {} },
        headers: {},
        config: {},
        statusText: 'OK',
      })
      apiClient.defaults.adapter = adapter

      await apiClient.get('/test')

      const config = adapter.mock.calls[0][0]
      expect(config.headers.get('Authorization')).toBeFalsy()
    })

    it('GET 请求自动附加 timezone 参数', async () => {
      const adapter = vi.fn().mockResolvedValue({
        status: 200,
        data: { code: 0, data: {} },
        headers: {},
        config: {},
        statusText: 'OK',
      })
      apiClient.defaults.adapter = adapter

      await apiClient.get('/test')

      const config = adapter.mock.calls[0][0]
      expect(config.params).toHaveProperty('timezone')
    })

    it('POST 请求不附加 timezone 参数', async () => {
      const adapter = vi.fn().mockResolvedValue({
        status: 200,
        data: { code: 0, data: {} },
        headers: {},
        config: {},
        statusText: 'OK',
      })
      apiClient.defaults.adapter = adapter

      await apiClient.post('/test', { foo: 'bar' })

      const config = adapter.mock.calls[0][0]
      expect(config.params?.timezone).toBeUndefined()
    })
  })

  // --- 响应拦截器 ---

  describe('响应拦截器', () => {
    it('code=0 时解包 data 字段', async () => {
      const adapter = vi.fn().mockResolvedValue({
        status: 200,
        data: { code: 0, data: { name: 'test' }, message: 'ok' },
        headers: {},
        config: {},
        statusText: 'OK',
      })
      apiClient.defaults.adapter = adapter

      const response = await apiClient.get('/test')
      expect(response.data).toEqual({ name: 'test' })
    })

    it('code!=0 时拒绝并返回结构化错误', async () => {
      const adapter = vi.fn().mockResolvedValue({
        status: 200,
        data: { code: 1001, message: '参数错误', data: null },
        headers: {},
        config: {},
        statusText: 'OK',
      })
      apiClient.defaults.adapter = adapter

      await expect(apiClient.get('/test')).rejects.toEqual(
        expect.objectContaining({
          code: 1001,
          message: '参数错误',
        })
      )
    })
  })

  // --- 401 Token 刷新 ---

  describe('401 Token 刷新', () => {
    it('无 refresh_token 时 401 清除 localStorage', async () => {
      localStorage.setItem('auth_token', 'expired-token')
      // 不设置 refresh_token

      // Mock window.location
      const originalLocation = window.location
      Object.defineProperty(window, 'location', {
        value: { ...originalLocation, pathname: '/dashboard', href: '/dashboard' },
        writable: true,
      })

      const adapter = vi.fn().mockRejectedValue({
        response: {
          status: 401,
          data: { code: 'TOKEN_EXPIRED', message: 'Token expired' },
        },
        config: {
          url: '/test',
          headers: { Authorization: 'Bearer expired-token' },
        },
        code: 'ERR_BAD_REQUEST',
      })
      apiClient.defaults.adapter = adapter

      await expect(apiClient.get('/test')).rejects.toBeDefined()

      expect(localStorage.getItem('auth_token')).toBeNull()

      // 恢复 location
      Object.defineProperty(window, 'location', {
        value: originalLocation,
        writable: true,
      })
    })
  })

  // --- 网络错误 ---

  describe('网络错误', () => {
    it('网络错误返回 status 0 的错误', async () => {
      const adapter = vi.fn().mockRejectedValue({
        code: 'ERR_NETWORK',
        message: 'Network Error',
        config: { url: '/test' },
        // 没有 response
      })
      apiClient.defaults.adapter = adapter

      await expect(apiClient.get('/test')).rejects.toEqual(
        expect.objectContaining({
          status: 0,
          message: 'Network error. Please check your connection.',
        })
      )
    })
  })

  // --- 请求取消 ---

  describe('请求取消', () => {
    it('取消的请求保持原始取消错误', async () => {
      const source = axios.CancelToken.source()

      const adapter = vi.fn().mockRejectedValue(
        new axios.Cancel('Operation canceled')
      )
      apiClient.defaults.adapter = adapter

      await expect(
        apiClient.get('/test', { cancelToken: source.token })
      ).rejects.toBeDefined()
    })
  })
})
