import axios, { AxiosHeaders } from 'axios'
import { afterEach, describe, expect, it, vi } from 'vitest'
import {
  ApiResponseError,
  getApiErrorDetails,
  http,
  registerAuthRefreshHandler,
  registerAuthSessionExpiredHandler,
  unwrapApiResponse,
} from './http'

const originalAdapter = http.defaults.adapter

afterEach(() => {
  http.defaults.adapter = originalAdapter
  registerAuthRefreshHandler(async () => { throw new Error('refresh handler is not configured') })
  registerAuthSessionExpiredHandler(() => undefined)
})

describe('API error diagnostics', () => {
  it('treats only body code 200 as success', () => {
    expect(unwrapApiResponse({ code: '200', message: 'success', data: { id: '1' } }))
      .toEqual({ id: '1' })
    expect(() => unwrapApiResponse({ code: '0', message: 'legacy success code', data: null }))
      .toThrow(ApiResponseError)
  })

  it('keeps business request and trace identifiers when unwrapping fails', () => {
    expect(() => unwrapApiResponse({
      code: 'A0403',
      message: '无权限',
      data: null,
      requestId: 'request-1',
      traceId: 'trace-1',
    })).toThrow(ApiResponseError)

    try {
      unwrapApiResponse({ code: 'A0403', message: '无权限', data: null, requestId: 'request-1', traceId: 'trace-1' })
    } catch (error) {
      expect(getApiErrorDetails(error)).toEqual({
        message: '无权限',
        code: 'A0403',
        requestId: 'request-1',
        traceId: 'trace-1',
      })
    }
  })

  it('extracts identifiers from an HTTP error envelope', () => {
    const error = new axios.AxiosError('Request failed', 'ERR_BAD_RESPONSE', undefined, undefined, {
      status: 503,
      statusText: 'Service Unavailable',
      headers: {},
      config: { headers: new AxiosHeaders() },
      data: { code: 'S0503', message: '服务不可用', requestId: 'request-2', traceId: 'trace-2' },
    })

    expect(getApiErrorDetails(error)).toEqual({
      message: '服务不可用',
      code: 'S0503',
      requestId: 'request-2',
      traceId: 'trace-2',
    })
  })

  it('explains a proxy 413 response without a JSON error envelope', () => {
    const error = new axios.AxiosError('Request failed', 'ERR_BAD_REQUEST', undefined, undefined, {
      status: 413,
      statusText: 'Payload Too Large',
      headers: {},
      config: { headers: new AxiosHeaders() },
      data: '<html>Request Entity Too Large</html>',
    })

    expect(getApiErrorDetails(error)).toEqual({
      message: '上传文件的请求体过大，服务器已拒绝；请压缩后重试，如文件未超过 5MB，请联系管理员检查网关上传限制',
      code: 'HTTP_413',
      requestId: undefined,
      traceId: undefined,
    })
  })

  it('notifies session expiry once when concurrent 401 requests share a failed refresh', async () => {
    const refresh = vi.fn(async () => { throw new Error('refresh token expired') })
    const expired = vi.fn()
    registerAuthRefreshHandler(refresh)
    registerAuthSessionExpiredHandler(expired)
    http.defaults.adapter = async (config) => {
      throw new axios.AxiosError('Unauthorized', 'ERR_BAD_REQUEST', config, undefined, {
        status: 401,
        statusText: 'Unauthorized',
        headers: {},
        config,
        data: { code: 'A0401', message: '登录状态已过期' },
      })
    }

    const results = await Promise.allSettled([
      http.get('/platform/v1/orders'),
      http.get('/platform/v1/warehouses'),
    ])

    expect(results.every((result) => result.status === 'rejected')).toBe(true)
    expect(refresh).toHaveBeenCalledTimes(1)
    expect(expired).toHaveBeenCalledTimes(1)
  })
})