const GET = 'GET';
const POST = 'POST';
const PUT = 'PUT';
const FORM = 'FORM';
const DELETE = 'DELETE';
import config from '@/config/index.js'
const baseURL = config.BASE_URL;

const waitingList = [] //等待队列
const excutingList = [] //执行队列

function request(method, url, data, type, lodingFlag = true) {
	if (lodingFlag) {
		uni.showLoading({
			mask: true,
		})
	}
	return new Promise(function(resolve, reject) {
		let token = uni.getStorageSync('token')
		let header = {
			'content-type': type ? 'application/x-www-form-urlencoded;charset=UTF-8' : 'application/json',
			'Authorization': token,
			'lang': uni.getStorageSync('locale') === 'zh-Hans' ? 'zh_CN' : 'zh-tw',
		}
		const requestTask = uni.request({
			url: baseURL + url,
			method: method,
			data: data,
			header: header,
			success: (res) => {
				//判断状态码
				if (lodingFlag) {
					uni.hideLoading()
				}
				if (res.data.code == 200 || res.data.code == 0) {
					resolve(res.data);
					uni.hideLoading()
					return
				}
				if (res.data.code == 502) {
					resolve(res.data);
					uni.showToast({
						title: res.data.msg,
						duration: 2000,
						icon: 'none',
						mask: true,
					})
					uni.hideLoading()
					return
				}
				if (res.data.code == 1 || res.data.code == 500) {
					uni.showToast({
						title: res.data.data || res.data.msg,
						duration: 2000,
						icon: 'none',
						mask: true,
					})
					uni.hideLoading()
					return
				}
				if (res.data.code == 401 || res.data.code == 510 || res.data.code == 504 || res
					.data
					.code == 505) {
					uni.clearStorageSync()
					handleLogout('登录过期，请重新登录')
					return
				}

				if (res.data.code == 501) {
					uni.showToast({
						title: res.data.msg,
						duration: 2000,
						icon: 'none',
						mask: true,
					})
					uni.hideLoading()
					return
				}
				if (res.data.code == 506) {
					resolve(res.data);
					uni.hideLoading()
					return
				}

				uni.showToast({
					title: res.data.msg || '服务器错误',
					duration: 2000,
					icon: 'none',
					mask: true,
				})
				uni.hideLoading()

			},
			fail(err) {
				if (lodingFlag) {
					uni.hideLoading()
				}
				reject(err)
			},
			complete: () => {
				const excutingIndex = excutingList.findIndex(item => item === requestTask)
				excutingList.splice(excutingIndex, 1)
				const [apiFn] = waitingList
				if (excutingList.length === 0 && typeof apiFn === 'function') {
					apiFn()
					waitingList.splice(0, 1)
				}
			},
		})
		excutingList.push(requestTask)
	})


}

// 被冻结跳转到登录页并取消后续请求
function handleLogout(str) {
	let routeStr = getCurrentPages()[getCurrentPages().length - 1].route
	// 无论 showLogoutModal 是多少，遇到 401 都要弹窗并强制退出
	uni.setStorageSync('showLogoutModal', 0)
	uni.showModal({
		title: '提示',
		content: str,
		showCancel: false,
		success: function(res) {
			if (res.confirm) {
				if (routeStr == 'pages/login/login') {
					return
				}
				uni.reLaunch({
					url: '/pages/login/login'
				})
			}
		}
	});
	clearAllRequest()
}

// 清除请求队列
function clearAllRequest() {
	if (excutingList.length > 0) {
		for (var i = 0; i < excutingList.length; i++) {
			const item = excutingList[i]
			if (item && item.abort) {
				item.abort()
			}
		}
		excutingList.length = 0
		waitingList.length = 0
	}
}

export default {
	get: (url, data, type = false, lodingFlag = true) => request(GET, url, data, type, lodingFlag),
	post: (url, data, type = false, lodingFlag = true) => request(POST, url, data, type, lodingFlag),
	put: (url, data, type = false, lodingFlag = true) => request(PUT, url, data, type, lodingFlag),
	FORM: (url, data, type = false, lodingFlag = true) => request(FORM, url, data, type, lodingFlag),
	delete: (url, data, type = false, lodingFlag = true) => request(DELETE, url, data, type, lodingFlag),
	upload: (url, filePath, name = 'file', formData = {}) => {
		uni.showLoading({ mask: true })
		return new Promise((resolve, reject) => {
			let token = uni.getStorageSync('token')
			uni.uploadFile({
				url: baseURL + url,
				filePath: filePath,
				name: name,
				formData: formData,
				header: {
					'Authorization': token,
					'lang': uni.getStorageSync('locale') === 'zh-Hans' ? 'zh_CN' : 'zh-tw',
				},
				success: (res) => {
					uni.hideLoading()
					try {
						const data = JSON.parse(res.data)
						if (data.code == 200 || data.code == 0) {
							resolve(data)
						} else {
							uni.showToast({
								title: data.msg || '上传失败',
								icon: 'none'
							})
							reject(data)
						}
					} catch (e) {
						reject(e)
					}
				},
				fail: (err) => {
					uni.hideLoading()
					reject(err)
				}
			})
		})
	}
}