import { ElMessage } from 'element-plus'
import axios, {
    AxiosError,
    type AxiosInstance,
    type AxiosRequestConfig,
    type AxiosResponse,
    type InternalAxiosRequestConfig
} from 'axios'
import { showFullScreenLoading, tryHideFullScreenLoading } from '@/components/Loading/fullScreen'
import { LOGIN_URL } from '@/config'
import { type ResultData } from '@/api/interface'
import { ResultEnum } from '@/enums/httpEnum'
import { checkStatus } from './helper/checkStatus'
import { useUserStore } from '@/stores/modules/user'
import router from '@/routers'
import { refreshToken } from '@/api/user/login'
import { EventSourcePolyfill } from 'event-source-polyfill'

export interface CustomAxiosRequestConfig extends InternalAxiosRequestConfig {
    loading?: boolean
}

const config = {
    // 默认地址请求地址，可在 .env 开头文件中修改
    baseURL: import.meta.env.VITE_API_URL as string,
    // 设置超时时间（60s）
    timeout: 60000,
    // 跨域时候允许携带凭证
    withCredentials: true,
    // post请求指定数据类型以及编码
    headers: { 'Content-Type': 'application/json;charset=utf-8' }
}

class RequestHttp {
    service: AxiosInstance

    public constructor(config: AxiosRequestConfig) {
        // 创建实例
        this.service = axios.create(config)

        /**
         * @description 请求拦截器
         * 客户端发送请求 -> [请求拦截器] -> 服务器
         * token校验(JWT) : 接受服务器返回的 token,存储到 vuex/pinia/本地储存当中
         */
        this.service.interceptors.request.use(
            (config: CustomAxiosRequestConfig) => {
                isFirst = true
                const userStore = useUserStore()
                // 当前请求不需要显示 loading，在 api 服务中通过指定的第三个参数: { loading: false } 来控制
                config.loading ?? (config.loading = true)
                config.loading && showFullScreenLoading()
                if (config.headers && typeof config.headers.set === 'function') {
                    config.headers.set('Authorization', 'Bearer ' + userStore.accessToken)
                    config.headers.set('Is-Refresh-Token', userStore.isRefreshToken + '')
                }
                return config
            },
            (error: AxiosError) => {
                return Promise.reject(error)
            }
        )

        let isFirst = true
        /**
         * @description 响应拦截器
         *  服务器换返回信息 -> [拦截统一处理] -> 客户端JS获取到信息
         */
        this.service.interceptors.response.use(
            async (response: AxiosResponse) => {
                const { data } = response
                const userStore = useUserStore()
                tryHideFullScreenLoading()

                if (data.code === ResultEnum.ACCESSTOKEN_EXPIRED) {
                    // 用长token去换短token
                    userStore.setAccessToken(userStore.refreshToken)
                    userStore.setIsRefreshToken(true)
                    const result = await refreshToken()
                    if (result) {
                        //获取新token成功的话
                        // 有新的token后，重新请求
                        userStore.setAccessToken(result.data.accessToken)
                        userStore.setRefreshToken(result.data.refreshToken)
                        userStore.setIsRefreshToken(false)
                        userStore.setExp(1000 * 60 * 60 * 24 * 30)
                        response.config.headers.Authorization = `Bearer ${result.data.accessToken}` //重新请求前需要将更新后的新token更换掉之前无效的token,不然会死循环
                        const resp = await this.service.request(response.config)
                        return resp
                    } else {
                        // 刷新失效，跳转登录页
                    }
                }
                // 登陆失效
                if (data.code === ResultEnum.OVERDUE) {
                    //console.log('登陆失效')
                    userStore.setAccessToken('')
                    userStore.setRefreshToken('')
                    userStore.setIsRefreshToken(false)
                    userStore.setUserInfo({ id: '', name: '' })
                    userStore.setExp(0)
                    await router.replace(LOGIN_URL)
                    if (isFirst) {
                        //临时处理token失效弹窗多次
                        ElMessage.error(data.message)
                        isFirst = false
                    }
                    return Promise.reject(data)
                }
                // 全局错误信息拦截（防止下载文件的时候返回数据流，没有 code 直接报错）
                if (data.code && data.code !== ResultEnum.SUCCESS) {
                    if (data.message.includes('&')) {
                        let formattedMessage = data.message.split('&').join('<br>')
                        if (data.message.includes(':')) {
                            formattedMessage = formattedMessage.replace(':', '')
                        }
                        ElMessage.error({ message: formattedMessage, dangerouslyUseHTMLString: true })
                        return Promise.reject(data)
                    }

                    ElMessage.error(data.message)
                    return Promise.reject(data)
                }
                // 成功请求（在页面上除非特殊情况，否则不用处理失败逻辑）

                if (userStore.exp <= Date.now() && userStore.exp !== 0) {
                    userStore.setAccessToken('')
                    userStore.setRefreshToken('')
                    userStore.setIsRefreshToken(false)
                    userStore.setUserInfo({ id: '', name: '' })
                    userStore.setExp(0)
                    ElMessage.error('登录已过期，请重新登录!')
                    await router.replace(LOGIN_URL)
                    return Promise.reject(data)
                }
                // 对于blob类型的响应，返回完整的response对象以保留响应头
                if (response.config.responseType === 'blob') {
                    return response
                }
                return data
            },
            async (error: AxiosError) => {
                const { response } = error
                tryHideFullScreenLoading()
                //console.log('error', error.message)
                // 请求超时 && 网络错误单独判断，没有 response
                if (error.message.indexOf('timeout') !== -1) ElMessage.error('请求超时！请您稍后重试')
                if (error.message.indexOf('Network Error') !== -1) ElMessage.error('网络错误！请您稍后重试')
                // 根据服务器响应的错误状态码，做不同的处理
                if (response) checkStatus(response.status)
                // 服务器结果都没有返回(可能服务器错误可能客户端断网)，断网处理:可以跳转到断网页面
                if (!window.navigator.onLine) router.replace('/500')
                return Promise.reject(error)
            }
        )
    }

    /**
     * @description 常用请求方法封装
     */
    get<T>(url: string, params?: object, _object = {}): Promise<ResultData<T>> {
        return this.service.get(url, { params, ..._object })
    }

    post<T>(url: string, params?: object | string, _object = {}): Promise<ResultData<T>> {
        return this.service.post(url, params, _object)
    }

    put<T>(url: string, params?: object, _object = {}): Promise<ResultData<T>> {
        return this.service.put(url, params, _object)
    }

    delete<T>(url: string, params?: any, _object = {}): Promise<ResultData<T>> {
        return this.service.delete(url, { params, ..._object })
    }

    download(url: string, params?: object, _object = {}): Promise<BlobPart> {
        return this.service.post(url, params, { ..._object, responseType: 'blob' }).then(res => res.data)
    }

    downloadWithHeaders(url: string, params?: object, _object = {}): Promise<AxiosResponse<Blob>> {
        return this.service.post(url, params, { ..._object, responseType: 'blob' })
    }

    upload(url: string, params?: object, _object = {}): Promise<BlobPart> {
        return this.service.post(url, params, {
            ..._object,
            headers: { 'Content-Type': 'multipart/form-data' }
        })
    }

    /**
     * 针对excel的上传，默认返回的是blob类型，Excel没问题时返回json特殊处理
     */
    uploadExcel(url: string, params?: object, _object = {}): Promise<BlobPart> {
        return this.service
            .post(url, params, {
                ..._object,
                headers: { 'Content-Type': 'multipart/form-data' },
                responseType: 'blob'
            })
            .then(res => res.data)
    }

    // 添加SSE连接方法
    sse(url: string, params?: any): EventSource {
        const userStore = useUserStore()
        // 构造带参数的URL
        let requestUrl = config.baseURL + url
        if (params) {
            const searchParams = new URLSearchParams()
            for (const key in params) {
                if (Object.prototype.hasOwnProperty.call(params, key)) {
                    searchParams.append(key, String(params[key]))
                }
            }
            requestUrl += '?' + searchParams.toString()
        }

        // 创建EventSource连接
        const eventSource = new EventSourcePolyfill(requestUrl, {
            headers: {
                Authorization: 'Bearer ' + userStore.accessToken
            },
            // 增加超时时间到1200秒
            heartbeatTimeout: 1200000
        })

        // 设置默认的Authorization头部
        eventSource.addEventListener('open', function () {
            //console.log('SSE连接已建立')
        })
        // 添加错误处理
        eventSource.addEventListener('error', function (err) {
            console.error('SSE连接错误:', err)
        })

        return eventSource
    }
}

export default new RequestHttp(config)