class Server {
	constructor(apiDataUrl, websocketUrl) {
		this.socketHandlers = [];
		this.apidataurl = apiDataUrl;
		this.websocketurl = websocketUrl;
		this.webSocket = null;
	}
	apiGet = (path) => {
		return new Promise((resolve, reject) => {
			var r = new XMLHttpRequest();
			r.open("GET", this.apidataurl + path, true);
			r.onreadystatechange = function (response) {
				if (r.readyState == 4 && r.status == 200) {
					resolve(JSON.parse(r.responseText));
				}
				if (r.readyState == 4 && r.status != 200) {
					reject(JSON.parse(r.response));
				}
				return;
			}
			r.onerror = function (response) {
				console.error("onerror", response, r);
				reject(r.responseText);
			}
			r.setRequestHeader("Content-Type", "application/json");
			r.send();
		});
	};

	apiPost = (path, data) => {
		return new Promise((resolve, reject) => {
			var r = new XMLHttpRequest();
			r.open("POST", this.apidataurl + path, true);
			r.onreadystatechange = function (response) {
				if (r.readyState == 4 && r.status == 200) {
					resolve(JSON.parse(r.responseText));
				}
				if (r.readyState == 4 && r.status != 200) {
					reject(r.responseText);
				}
				return;
			}
			r.onerror = function (response) {
				console.error("onerror", response, r);
				reject(r.responseText);
			}
			r.setRequestHeader("Content-Type", "application/json");
			let jsonData = JSON.stringify(data);
			r.send(jsonData);
		});
	};

	websocketConnect = () => {
		this.webSocket = new WebSocket(this.websocketurl);
		this.webSocket.onmessage = this.handleWebsocketMessage;
		this.webSocket.onopen = this.handleWebsocketOpen;
		this.webSocket.onclose = this.handleWebsocketClose;
		this.webSocket.onerror = this.handleWebsocketError;
	};

	websocketSend = (message) => {
		try {
			this.ebSocket.send(message);
		} catch (error) {
			console.error("websocket", error);
		}
	};

	attachWebsocketHandler = (handler) => {
		this.socketHandlers.push(handler);
	}

	removeWebsocketHandler = (handler) => {
		this.socketHandlers.splice(this.socketHandlers.indexOf(handler), 1);
	}

	handleWebsocketMessage = (event) => {
		this.socketHandlers.forEach(handler => {
			if(handler.hasOwnProperty("onmessage")){
				handler.onmessage(event.data);
			}
		})
	}

	handleWebsocketOpen = (event) => {
		this.socketHandlers.forEach(handler => {
			if(handler.hasOwnProperty("onopen")){
				handler.onopen(event);
			}
		})
	}

	handleWebsocketClose = (event) => {
		this.socketHandlers.forEach(handler => {
			if(handler.hasOwnProperty("onclose")){
				handler.onclose(event);
			}
		})
	}

	handleWebsocketError = (event) => {
		this.socketHandlers.forEach(handler => {
			if(handler.hasOwnProperty("onerror")){
				handler.onerror(event);
			}
		})
	}
}