//http 网络请求封装类（和业务相关的代码请不要写进这个类中）
// import UserDataStorage from './UserDataStorage';

class efunRequest {
	constructor() {
		this._url = '';
		this._params = {};
		this._data = {};
		this._header = {};
		this.xmlHTTPRequest = null;
		this._onSuccess = null;
		this._onFailed = null;
		this._deserialize = null;
		// 异步获取的
		this.uid = this.getuid();
	}
	async getuid() {
		const userinfo = await storage
			.load({
				key: 'userInfo'
			})
			.catch((error) => {
				return '';
			});
		if (userinfo === '') {
			return '';
		}
		return JSON.parse(userinfo).uid;
	}
	request(method) {
		const paramStr = () => {
			if (!this._params) {
				return '';
			}
			var pstr = '';
			for (let key in this._params) {
				pstr += `${key}=${this._params[key]}&`;
			}
			return pstr.slice(0, -1);
		};

		this.xmlHTTPRequest = new XMLHttpRequest();
		this.xmlHTTPRequest.open(method, this._url + '?' + paramStr(), true);
		this.xmlHTTPRequest.setRequestHeader(
			'Content-Type',
			'application/' + (method == 'POST' || method == 'PUT' ? 'x-www-form-urlencoded' : 'text')
		);
		console.log('====================================');
		console.log('uid', this.uid);
		console.log('====================================');
		this.xmlHTTPRequest.setRequestHeader('uid', this.uid ? this.uid : '');

		for (let key in this._header) {
			this.xmlHTTPRequest.setRequestHeader(key, this._header[key]);
		}

		this.xmlHTTPRequest.onreadystatechange = () => {
			this.whenResponse();
		};

		var sendBody = null;
		if (this._data && (method == 'POST' || method == 'PUT')) {
			var arr = new Array();
			var i = 0;
			for (var attr in this._data) {
				arr[i] = encodeURIComponent(attr) + '=' + encodeURIComponent(this._data[attr]);
				i++;
			}
			sendBody = '&' + arr.join('&');
		}
		this.xmlHTTPRequest.send(sendBody);
		return this;
	}

	get() {
		this.request('GET');
		return this;
	}

	post() {
		this.request('POST');
		return this;
	}

	put() {
		this.request('PUT');
		return this;
	}

	delete() {
		this.request('DELETE');
		return this;
	}

	whenResponse() {
		if (this.xmlHTTPRequest.readyState != 4) {
			return;
		}

		if (this._deserialize) {
			this._deserialize(this.xmlHTTPRequest.responseText, this);
			return;
		}

		let cb = this.xmlHTTPRequest.status == 200 ? this._onSuccess : this._onFailed;
		if (!cb) {
			return;
		}
		cb(this.xmlHTTPRequest.status, this.xmlHTTPRequest.responseText);
	}

	success(callback) {
		this._onSuccess = callback;
		return this;
	}

	fail(callback) {
		this._onFailed = callback;
		return this;
	}

	header(obj, rewrite) {
		if (rewrite) {
			this._header = obj;
		} else {
			for (let key in obj) {
				this._header[key] = obj[key];
			}
		}
		return this;
	}

	params(obj) {
		this._params = obj;
		return this;
	}

	data(obj) {
		this._data = obj;
		return this;
	}

	url(str) {
		this._url = str;
		return this;
	}

	responseDeserialize(func) {
		this._deserialize = func;
		return this;
	}

	static getHttpRequest() {
		let request = new efunRequest();
		// if (UserDataStorage.getToken()) {
		//     request.header({
		//         'Authentication': UserDataStorage.getToken()
		//     });
		// }
		request.responseDeserialize(function(res, req) {
			function callFailed(data) {
				if (req._onFailed) {
					req._onFailed(data);
				}
			}

			function callSuccess(data) {
				if (req._onSuccess) {
					req._onSuccess(data);
				}
			}

			let rObj = null;
			try {
				rObj = JSON.parse(res);
			} catch (e) {
				callFailed(e);
				return;
			}
			if (req.xmlHTTPRequest.status != 200) {
				callFailed(rObj);
				return;
			}
			if (!rObj.success) {
				callFailed(rObj);
				return;
			}
			callSuccess(rObj);
		});
		return request;
	}
}

export default efunRequest;