const React = require("react");
const moment = require("moment");
const ReactDOM = require("react-dom");
const Ps = require("perfect-scrollbar");
const ReactEmoji = require("react-emoji");
const ReactAutolink = require("react-autolink");

const MessageBrowser = React.createClass({
	getInitialState() {
		return {
			browserState: "",
			messages: [],
			page: 0,
			limit: 250,
			search: ""
		}
	},

	handleNextPage(e) {
		e.preventDefault();
		const page = this.state.page;
		this.setState({ page: page + 1 });
		this.loadMessages();
	},

	handlePreviousPage(e) {
		e.preventDefault();
		const page = this.state.page;
		if (page < 1) return;
		this.setState({ page: page - 1 });
		this.loadMessages();
	},

	pageHandlers() {
		let previous;
		if (this.state.page > 0) {
			previous = (
				<a className="btn btn-xs btn-primary add-right"
					onClick={this.handlePreviousPage}>Prev</a>
			);
		}
		let next;
		if (this.state.messages.length === this.state.limit) {
			next = (
				<a className="btn btn-xs btn-primary" 
					onClick={this.handleNextPage}>Next</a>
			);
		}
		return (
			<div>
				{previous}
				<span className="add-right">
					{this.state.page}
				</span>
				{next}
			</div>
		);
	},

	loadMessages() {
		const limit = this.state.limit;
		const page = this.state.page;
		let data = {
			limit: limit,
			page: page
		};

		if (this.state.search.length) {
			data.query = this.state.search;
		}

		this.setState({ browserState: "Retrieving messages"});
		$.ajax({
			url: "/api/messages",
			data: data
		})
		.done(data => {
			this.setState({
				messages: data.messages,
				browserState: ""
			});
		})
		.fail(error => {
			console.error(error);
			this.setState({
				browserState: `Unable to retrieve messages.`
			});
		})
	},

	componentDidMount() {
		this.loadMessages();
	},

	updateLimit(e) {
		let newLimit = parseInt(e.target.value, 10);
		if (isNaN(newLimit) || newLimit > 250) newLimit = 250;
		this.setState({ limit: newLimit });
	},

	updateSearch(e) {
		this.setState({ search: e.target.value });
	},

	render() {
		let browserState;
		if (this.state.browserState.length) {
			browserState = (
				<div className="col-xs-7">
					<div className="well">{this.state.browserState}</div>
				</div>
			);
		}
		const messages = this.state.messages.map(message => {
			return (
				<tr key={message._id}>
					<td className="col-xs-2">{(new Date(message.createdAt)).toString()}</td>
					<td className="col-xs-3">{message.author.username}</td>
					<td className="col-xs-5">{message.content}</td>
					<td className="col-xs-2">{message._id}</td>
				</tr>
			);
		});
		return (
			<div className="row">
				<div className="col-xs-5">
					<div className="form-horizontal">
					  <div className="form-group">
					    <label className="col-sm-3 control-label">Max Results</label>
					    <div className="col-sm-9">
					      <input type="number" className="form-control" 
					      	onChange={this.updateLimit}
					      	value={this.state.limit}></input>
					    </div>
					  </div>
					  <div className="form-group">
					    <label className="col-sm-3 control-label">Search Filter</label>
					    <div className="col-sm-9">
					      <input type="text" className="form-control" 
					      	onChange={this.updateSearch}
					      	value={this.state.search}></input>
					    </div>
					  </div>
					  <div className="form-group">
					  	<div className="col-sm-offset-3 col-sm-9">
						  	<button 
									className="btn btn-primary"
									onClick={this.loadMessages}>Search</button>
					  	</div>
					  </div>
					  <div className="row">
						  <div className="col-sm-offset-3 col-sm-9">
						  	<p>Page Control</p>
						  	{this.pageHandlers()}
					  	</div>
				  	</div>
				  </div>
				</div>
				{browserState}
				<div className="col-xs-12">
					<table className="table">
						<thead>
							<tr>
								<th>Date</th>
								<th>Author</th>
								<th>Message</th>
								<th>ID</th>
							</tr>
						</thead>
						<tbody>
							{messages}
						</tbody>
					</table>
				</div>
			</div>
		);
	}
});

const Chatroom = exports.Chatroom = React.createClass({
	propTypes: {
		messages: React.PropTypes.array.isRequired,
		socket: React.PropTypes.object.isRequired,
		user: React.PropTypes.object.isRequired
	},

	getInitialState() {
		return {
			autoScroll: true
		};
	},

	componentDidMount() {
		let self = this;

		this.scrollListener = _.debounce((event) => {
			self.temporarilyDisableAutoScroll(event);
		}, 300, {
		  leading: false,
		  trailing: true
		});

		let node = ReactDOM.findDOMNode(this.refs.messageContainer);
		node.addEventListener('scroll', this.scrollListener);

		$(window).on("load", this.scrollToBottom);
	},

	componentWillUnmount() {
		node.removeEventListener('scroll', this.scrollListener);
		clearTimeout(this.disableScrollTimer);
	},

	loadMoreMessages() {
		const earliestMessage = this.props.messages[0];
		if (earliestMessage === undefined) return;
		this.props.socket.emit("message:refresh", {
			before: earliestMessage.createdAt
		});
	},

	sendMessage(message) {
		this.props.socket.emit("newMessage", {message: message});
	},

	clearAutoScrollTimeout() {
		if (this.disableScrollTimer) clearTimeout(this.disableScrollTimer);
	},

	temporarilyDisableAutoScroll(event) {
		let self = this;
		let node = event.target;
		if (node) {
			if (node.scrollHeight - node.scrollTop === node.clientHeight) {
				this.setState({ autoScroll: true });
				this.clearAutoScrollTimeout();
			}
			if (node.scrollHeight - node.scrollTop - node.clientHeight < 50) return;
		}
		this.setState({ autoScroll: false });
		this.clearAutoScrollTimeout();
		this.disableScrollTimer = setTimeout(() => {
			self.setState({
				autoScroll: true
			})
		}, 10000);
	},

	componentDidUpdate(prevProps) {
		if (prevProps.messages.length < this.props.messages.length) {
			this.scrollToBottom();
		}
	},

	scrollToBottom() {
		if (!this.state.autoScroll) return;
		let node = ReactDOM.findDOMNode(this.refs.messageContainer);
	  node.scrollTop = node.scrollHeight;
	},

	render() {
		const socket = this.props.socket;
		const messages = this.props.messages.map(message => {
			if (message) {
				return <ChatMessage message={message} 
									key={message._id}
									socket={socket}
									user={this.props.user} />
			}
		});
		return (
			<div>
				<ul className="chat" id="chatmessages" ref="messageContainer" 
					style={{height: this.props.containerHeight - 170}}>
					<li className="text-center ">
						<a href="#"
							onClick={this.loadMoreMessages}
							className="btn btn-primary btn-xs">
							Load more messages
						</a>
					</li>
					{messages}
				</ul>
				<div>
					<MessageBar socket={socket}/>
				</div>
			</div>
		);
	}
});

const imgurRegex = /^(https?:\/\/i\.imgur\.com\/\S*\.(jpg|png))$/i;

const ChatMessage = React.createClass({
	propTypes: {
		user: React.PropTypes.object.isRequired,
		socket: React.PropTypes.object.isRequired,
		message: React.PropTypes.object.isRequired
	},

	mixins: [
    ReactAutolink,
    ReactEmoji
  ],

  getInitialState() {
  	return {
  		createdAt: ""
  	}
  },

	messageContent: function () {
		let self = this;
		let message = self.props.message.content
		if (message.match(imgurRegex)) {
			return (
				<div className="imgur-container">
					<a href={message} target="_blank">
						<img className="imgur-chat" src={message} />
					</a>
				</div>
			);
		}

		return (
			<p className="wordwrap">
			{
				self.autolink(message, { 
					target: "_blank", 
					rel: "nofollow" 
				}).map((elem) => {
					if (_.isString(elem)) {
						return self.emojify(elem);
					} else {
						return elem;
					}
				})
			}
			</p>
		);
	},

	messageTime() {
		let self = this;
		let ts = new Date(self.props.message.createdAt);
		let t = ts.toLocaleTimeString(undefined,{hour:"2-digit", minute:"2-digit"});
		let d = ts.toLocaleDateString(undefined,{month: "2-digit", day:"2-digit"});
		let r = "";
		return r.concat(d," ", t);
	},

	render() {
		let deleteButton;
		let user = this.props.user;
		if (user && user.admin) {
			deleteButton = <DeleteMessageButton messageId={this.props.message._id} 
				socket={this.props.socket}/>;
		}
		return (
			<li className="left clearfix chat-message list-unstyled">
				<span className="chat-img pull-left">
						<img 
							src={this.props.message.author.avatar} 
							alt="User Avatar" 
							className="chat-avatar" />
				</span>
				<div className="chat-body clearfix">
					<div className="header">
						<strong className="primary-font">
							{this.props.message.author.username}
							</strong>
						<small className="pull-right text-muted">
							<span className="hidden-xs">
								{this.messageTime()}
							</span>
							{deleteButton}
						</small>
					</div>
					{this.messageContent()}
				</div>
			</li>
		);
	}
});

const DeleteMessageButton = React.createClass({
	propTypes: {
		socket: React.PropTypes.object.isRequired
	},

	handleClick (e) {
		e.preventDefault();
		this.props.socket.emit("message:delete", {
			id: this.props.messageId
		});
	},

	render() {
		return (
			<a href="#" onClick={this.handleClick}>
				<i className="fa fa-trash-o"></i>
			</a>
		);
	}
})

const MessageBar = React.createClass({
	propTypes: {
		socket: React.PropTypes.object.isRequired
	},

	sendMessage(content) {
		this.props.socket.emit("message:new", {
			content: content
		});
	},

	getInitialState() {
		return {
			statusMessage: null
		};
	},

	checkInputLength() {
		const input = ReactDOM.findDOMNode(this.refs.content).value;
		const currentStatusMessage = this.state.statusMessage;
		if (input.length > 256) {
			return this.setState({
				statusMessage: "Maximum of 256 characters will be saved"
			})
		}
		if (currentStatusMessage !== null) {
			this.setState({
				statusMessage: null
			});
		}
	},

	handleInputChange() {
		// Noop, later assigned as debounced method in componentWillMount
	},

	handleSubmit(e) {
		e.preventDefault();
		let content = ReactDOM.findDOMNode(this.refs.content).value.trim();
		if (!content) return;
		ReactDOM.findDOMNode(this.refs.content).value = '';
		this.sendMessage(content);
		return;
	},

	componentWillMount() {
		this.handleInputChange = _.debounce(this.checkInputLength, {
			leading: false,
			trailing: true
		});
	},

	render() {
		let statusMessage;
		if (this.state.statusMessage !== null) {
			statusMessage = <div className="input-group">
				<small>{this.state.statusMessage}</small>
			</div>;
		}
		return (

			<form onSubmit={this.handleSubmit} autoComplete="off">
				<div className="input-group">
					<input 
						id="message-input" 
						type="text" 
						className="form-control message-input" 
						ref="content"
						onChange={this.handleInputChange}
						autoComplete="off"
						placeholder="Be polite please..." />
					<span className="input-group-btn">
						<input 
							type="submit" 
							className="btn btn-primary" 
							id="btn-chat" 
							value="Send" />
					</span>
				</div>
				{statusMessage}
			</form>
		);
	}
});