/**
 * 网络请求封装
 * 支持请求拦截、响应拦截、Loading显示、错误处理
 */

export type ApiResponse<T> = {
	code: number
	message: string
	data: T | null
}

export type RequestConfig = {
	url: string
	method?: 'GET' | 'POST' | 'PUT' | 'DELETE'
	data?: any
	header?: any
	showLoading?: boolean
	loadingText?: string
	showError?: boolean
}

const BASE_URL = 'https://28j56530c4.oicp.vip'
const TIMEOUT = 10000
let loadingCount = 0

function showLoading(text: string = '加载中...') {
	loadingCount++
	if (loadingCount === 1) {
		uni.showLoading({ title: text, mask: true })
	}
}

function hideLoading() {
	loadingCount--
	if (loadingCount <= 0) {
		loadingCount = 0
		uni.hideLoading()
	}
}

function getToken(): string {
	return uni.getStorageSync('token') as string ?? ''
}

function requestInterceptor(config: RequestConfig): RequestConfig {
	if (!config.url.startsWith('http')) config.url = BASE_URL + config.url

	const token = getToken()
	config.header = config.header ?? {}
	config.header['Content-Type'] = 'application/json'
	if (token) config.header['Authorization'] = `Bearer ${token}`

	if (config.showLoading !== false) showLoading(config.loadingText)
	return config
}

function responseInterceptor<T>(response: any, config: RequestConfig): ApiResponse<T> | null {
	if (config.showLoading !== false) hideLoading()

	if (response.statusCode !== 200) {
		handleError(response.statusCode, '网络请求失败', config.showError)
		return null
	}

	const rawResult = response.data as any
	const result: ApiResponse<T> = {
		code: Number(rawResult?.code ?? rawResult?.Code),
		message: String(rawResult?.message ?? rawResult?.Message ?? ''),
		data: (rawResult?.data ?? rawResult?.Data ?? null) as T | null
	}

	if (result.code !== 200) {
		handleError(result.code, result.message, config.showError)
		return null
	}
	return result
}

function handleError(code: number, message: string, showError: boolean = true) {
	console.error(`[Request Error] Code: ${code}, Message: ${message}`)
	if (!showError) return

	let errorMsg = message
	if (code === 401) {
		errorMsg = '登录已过期,请重新登录'
		uni.removeStorageSync('token')
		uni.removeStorageSync('userInfo')
		uni.reLaunch({ url: '/pages/login/index' })
	} else if (code === 403) {
		errorMsg = '没有权限访问'
	} else if (code === 404) {
		errorMsg = '请求的资源不存在'
	} else if (code === 500) {
		errorMsg = '服务器错误,请稍后重试'
	} else if (code === -1) {
		errorMsg = '网络异常'
	}

	uni.showToast({ title: errorMsg, icon: 'none', duration: 2000 })
}

export function request<T>(config: RequestConfig): Promise<ApiResponse<T> | null> {
	return new Promise((resolve) => {
		const finalConfig = requestInterceptor(config)
		uni.request({
			url: finalConfig.url,
			method: finalConfig.method ?? 'GET',
			data: finalConfig.data,
			header: finalConfig.header,
			timeout: TIMEOUT,
			success: (res) => resolve(responseInterceptor<T>(res, finalConfig)),
			fail: (err) => {
				if (finalConfig.showLoading !== false) hideLoading()
				handleError(-1, err.errMsg ?? '网络连接失败', finalConfig.showError)
				resolve(null)
			}
		})
	})
}

export function get<T>(url: string, data?: any, config?: Partial<RequestConfig>): Promise<ApiResponse<T> | null> {
	return request<T>({ url, method: 'GET', data, ...config })
}

export function post<T>(url: string, data?: any, config?: Partial<RequestConfig>): Promise<ApiResponse<T> | null> {
	return request<T>({ url, method: 'POST', data, ...config })
}

export function put<T>(url: string, data?: any, config?: Partial<RequestConfig>): Promise<ApiResponse<T> | null> {
	return request<T>({ url, method: 'PUT', data, ...config })
}

export function del<T>(url: string, data?: any, config?: Partial<RequestConfig>): Promise<ApiResponse<T> | null> {
	return request<T>({ url, method: 'DELETE', data, ...config })
}