(function (global, p5VendorJs) {
	if (!p5VendorJs.React) throw "Missing React"
	if (!p5VendorJs.ReactDOM) throw "Missing ReactDOM"
	if (!p5VendorJs.createReactClass) throw "Missing createReactClass"

	var DBG = DBG || 0;
	var DBG1 = 1;

	/**
	 * Loads props.url after mount.
	 * If props.url changed: clear, start loding new url.
	 * If props.url is empty: clear.
	 * 
	 * Clear: show props.emptyUrlContent || ''
	 * 
	 * @usage:
	 *   ReactDOM.render(
	 * 	     h(P5UI__AjaxContent, {
	 *           url: '',
	 * 	     }),
	 * 	     document.getElementById(HTML_ID)
	 *   )
	 * 
	 * props.url: url | null
	 * props.loading: html | null
	 * props.emptyContent: html | null - TODO: show when url is not defined
	 * 
	 */


	// var React = window.p5VendorJs.React;
	var createReactClass = window.p5VendorJs.createReactClass;
	var h = window.p5VendorJs.React.createElement;

	// 	componentDidMount: function () { console.log('MyWidget::componentDidMount...'); },
	// 	componentWillReceiveProps: function (nextProps) { console.log('MyWidget::componentWillReceiveProps(nextProps)...', nextProps); },
	// 	shouldComponentUpdate: function (nextProps, nextState) { console.log('MyWidget::shouldComponentUpdate(nextProps, nextState)...', nextProps, nextState); },
	// 	componentWillUpdate: function (nextProps, nextState) { console.log('MyWidget::componentWillUpdate(nextProps, nextState)...', nextProps, nextState); },
	// 	componentDidUpdate: function (prevProps, prevState) { console.log('MyWidget::componentDidUpdate(prevProps, prevState)...', prevProps, prevState); },
	// 	componentWillUnmount: function () { console.log('MyWidget::componentWillUnmount...'); },
	var P5UI__AjaxContent = createReactClass({
		_refContentEl: null,
		setContentElRef: function (el) {
			this._refContentEl = el;
		},
		getInitialState: function () {
			return {
				isLoading: false,
				postData: null, // if method = 'POST'
				response_type: null,
				response_msg: null,
				response_body: null,
			};
		},
		componentDidMount() {
			if (this.props.url) this._fetchContent();
		},
		componentDidUpdate(prevProps, prevState) {
			if (prevProps.url !== this.props.url) {
				this._fetchContent();
			}
		},

		_fetchContent: function () {
			this.setState({
				isLoading: true
			});
			// var _setState = this.setState.bind(this);
			var _handleFetchResponseSuccess = this._handleFetchResponseSuccess.bind(this);
			var _handleFetchResponseFail = this._handleFetchResponseFail.bind(this);
			var _handleFetchResponseJson = this._handleFetchResponseJson.bind(this);
			window.fetch(this.props.url,
				(!this.props.postData)
				?	{
						method: 'GET',
						headers: { 'Content-Type': 'application/json' },
						credentials: 'same-origin',
					}
				:	{
						method: 'POST',
						headers: { 'Content-Type': 'application/json' },
						credentials: 'same-origin',
						body: this.props.postData, // JSON.stringify(this.props.postData)
					}
			).then(function (response) {
				DBG1 && console.log("DBG:response", {
					status: response.status,
					response: response
				});
				response.text()
				.then(response.ok ? _handleFetchResponseSuccess : _handleFetchResponseFail)
				.catch(function (err) {
					_handleFetchResponseJson({
						response_type: 'error',
						response_msg: "" + err,
						response_body: null,
					})
				})
			}).then(function (data) {
				DBG1 && console.warn("DBG:response data", { data });
			}).catch(function (err) {
				DBG1 && console.log("Response Error #2:")
				DBG1 && console.error(err)
			})
		},

		_handleFetchResponseFail: function (responseText) {
			DBG1 && console.warn("DBG:response fail responseText", { responseText });
			if (!responseText) throw "Error";
			this._handleFetchResponseText(false, responseText)
		},

		_handleFetchResponseSuccess: function (responseText) {
			DBG1 && console.warn("DBG:response success responseText", { responseText });
			this._handleFetchResponseText(true, responseText)
		},

		_handleFetchResponseText: function (isOk, responseText) {
			DBG1 && console.warn("DBG:response _handleFetchResponseText", { isOk, responseText });
			if ('{' !== responseText.substr(0, 1)) throw "Response Parse Error: Expected json.";
			try {
				var jsonResponse = JSON.parse(responseText);
				if (!jsonResponse.msg) throw "Response Parse Error: Expected json with msg.";
				if (!isOk) throw jsonResponse.msg; // TODO: throw or just show alert for user

				this._handleFetchResponseJson(jsonResponse)
			} catch (err) {
				throw "Response Parse Error: " + err;
			}
		},

		_handleFetchResponseJson: function (jsonResponse) {
			DBG1 && console.warn("DBG:response _handleFetchResponseJson", { jsonResponse });
			this.setState({
				isLoading: false,
				response_type: jsonResponse.type,
				response_msg: jsonResponse.msg,
				response_body: jsonResponse.body,
			})
		},

		shouldComponentUpdate: function (nextProps, nextState) {
			DBG1 && console.warn("DBG:response shouldComponentUpdate", {
				props: this.props, nextProps,
				state: this.state, nextState,
			});
			if (!this.state.isLoading && nextState.isLoading) {
				doShowLoading(this.props, this._refContentEl);
			}
			if (!nextState.isLoading && nextState.response_type) {
				doParseResponseBody(nextState.response_type, nextState.response_msg, nextState.response_body, this._refContentEl);
			}
			return false; // render only once!
		},
		render: function () {
			DBG1 && console.log('DBG:render (TODO: render only once!)', { options: this.state.options });

			return h('div', {
				ref: this.setContentElRef,
				// dangerouslySetInnerHTML: { __html: this.renderContentHtml() }
			});
		}
	});

	function doParseResponseBody(type, msg, body, rootNode) {
		switch (type) {
			case 'error': return doNotify('error', (msg || "Wystąpił błąd"), rootNode);
			case 'success': return doShowContent(body, rootNode);
			default: return doNotify('warning', msg, rootNode);
		}
	}
	function doShowLoading(props, rootNode) {
		DBG1 && console.log('DBG:doShowLoading', { rootNode });
		if (!rootNode) return;
		rootNode.innerHTML = props.loading || '<p>Loading ...</p>';
		// DBG && rootNode.innerHTML += "\n" + '<pre>' + "props: " + JSON.stringify(props, null, 4) + '</pre>';
	}
	function doShowContent(body, rootNode) {
		DBG1 && console.log('DBG:doShowContent', { rootNode });
		if (!rootNode) return;
		if (body.reactNode) return p5UI__buildDom(body.reactNode, rootNode);
		if (body.html) return doShowHtmlContent(body.html, rootNode);
		if (typeof body === 'string' || body instanceof String) return doShowHtmlContent(body, rootNode);
		else {
			// TODO: if DBG
			rootNode.innerHTML = '<pre>' + JSON.stringify(body, null, 4) + '</pre>';
		}
	}
	function doShowHtmlContent(htmlContent, node) {
		node.innerHTML = htmlContent;
	}
	function doNotify(type, msg, rootNode) {
		// TODO: if (NOTIFY_USER_MODE) // 'inline' | 'notify'
		type = ('error' == type) ? 'danger' : type;
		rootNode.innerHTML = '<div class="alert alert-' + type + '" style="margin-bottom:0">' + msg + '</div>';
	}

	global.P5UI__AjaxContent = P5UI__AjaxContent;
})(window, window.p5VendorJs);