import axios, {AxiosRequestConfig} from 'axios'

const API_URL_KEY = 'API_URL'
const API_URL = localStorage.getItem(API_URL_KEY) || "http://localhost:8080"

// 设置默认的请求头
axios.defaults.headers.post['Content-Type'] = 'application/json;charset=UTF-8'
const service = axios.create({
    baseURL: API_URL,
    timeout: 10000
})

/**
 * 默认的结果拦截器
 */
service.interceptors.response.use((response) => {
    if (response && response.status === 200) {
        return response.data
    } else {
        return Promise.reject(response ? response.data : response)
    }
})

/**
 * API工具类
 * @author zhongming
 */
export default class ApiUtils {

    /**
     * 设置api地址
     * @param baseUrl api地址
     */
    public static setApiUrl(baseUrl: string) {
        localStorage.setItem(API_URL_KEY, baseUrl)
    }

    /**
     * 获取api地址
     */
    public static getApiUrl(): string | null {
        return localStorage.getItem(API_URL_KEY)
    }

    /**
     * 发送ajax请求
     * @param url
     * @param parameter
     * @param headers
     * @param timeout
     * @param customeConfig 自定义配置
     */
    public static postAjax(url: string, parameter?: any, headers?: {[index: string]: any}, timeout?: number, customeConfig?: AxiosRequestConfig): Promise<any> {
        headers = headers || {}
        parameter = parameter || {}
        customeConfig = customeConfig || {}
        const config: AxiosRequestConfig = {
            ...customeConfig,
            headers: headers
        }
        if (timeout) {
            config['timeout'] = timeout
        }
        return service.post(url, parameter, config)

    }

    /**
     * 批量上传文件
     * @param url
     * @param fileList
     * @param parameter
     * @param headers
     * @param timeout
     * @param customeConfig
     */
    public static batchUpload(url: string, fileList: Array<File>, parameter?: any, headers?: {[index: string]: any}, timeout?: number, customeConfig?: AxiosRequestConfig): Promise<any> {
        const formData: FormData = new FormData();
        fileList.forEach((file) => {
            formData.append('files', file)
        })
        return ApiUtils.doUploadFile(url, formData, parameter, headers, timeout, customeConfig)
    }

    /**
     * 上传文件
     * @param url
     * @param file
     * @param parameter
     * @param headers
     * @param timeout
     * @param customeConfig
     */
    public static upload(url: string, file: File, parameter?: any, headers?: {[index: string]: any}, timeout?: number, customeConfig?: AxiosRequestConfig): Promise<any> {
        const formData: FormData = new FormData();
        formData.append('file', file)
        return ApiUtils.doUploadFile(url, formData, parameter, headers, timeout, customeConfig)
    }

    /**
     * 执行文件上传
     * @param url
     * @param formData
     * @param parameter
     * @param headers
     * @param timeout
     * @param customeConfig
     */
    private static doUploadFile(url: string, formData: FormData, parameter?: any, headers?: {[index: string]: any}, timeout?: number, customeConfig?: AxiosRequestConfig): Promise<any> {
        customeConfig = customeConfig || {}
        // 添加其他参数
        if (parameter) {
            Object.keys(parameter)
                .forEach(key => {
                    formData.append(key, parameter[key])
                })
        }
        // 设置请求头
        const postHeaders = Object.assign({
            'Content-Type': 'multipart/form-data'
        }, headers || {})
        const config: AxiosRequestConfig = {
            ...customeConfig,
            headers: postHeaders
        }
        if (timeout) {
            config['timeout'] = timeout
        }
        return service.post(url, formData, config);
    }


}

export {
    service
}