import React from 'react';
import PropTypes from 'prop-types';
import { Text, View, StyleSheet, Button, SafeAreaView, Dimensions } from 'react-native';
import { ListView } from 'realm/react-native';
import { connect } from 'react-redux';
import { bindActionCreators } from 'redux';

import * as actions from '../actions';
import { openRoom } from '../actions/rooms';
import realm from '../lib/realm';
import RocketChat from '../lib/rocketchat';
import Message from '../containers/Message';
import MessageBox from '../containers/MessageBox';
import KeyboardView from '../presentation/KeyboardView';

const ds = new ListView.DataSource({ rowHasChanged: (r1, r2) => r1._id !== r2._id });
const styles = StyleSheet.create({
	container: {
		flex: 1,
		backgroundColor: '#fff'
	},
	safeAreaView: {
		flex: 1
	},
	list: {
		flex: 1,
		transform: [{ scaleY: -1 }]
	},
	separator: {
		height: 1,
		backgroundColor: '#CED0CE'
	},
	bannerContainer: {
		backgroundColor: 'orange'
	},
	bannerText: {
		margin: 5,
		textAlign: 'center',
		color: '#a00'
	},
	loadingMore: {
		transform: [{ scaleY: -1 }],
		textAlign: 'center',
		padding: 5,
		color: '#ccc'
	}
});

@connect(
	state => ({
		usersTyping: state.room.usersTyping,
		server: state.server.server,
		Site_Url: state.settings.Site_Url,
		Message_TimeFormat: state.settings.Message_TimeFormat,
		loading: state.messages.isFetching
	}),
	dispatch => ({
		actions: bindActionCreators(actions, dispatch),
		openRoom: rid => dispatch(openRoom({ rid }))
	})
)
export default class RoomView extends React.Component {
	static propTypes = {
		navigation: PropTypes.object.isRequired,
		openRoom: PropTypes.func.isRequired,
		rid: PropTypes.string,
		sid: PropTypes.string,
		name: PropTypes.string,
		server: PropTypes.string,
		Site_Url: PropTypes.string,
		Message_TimeFormat: PropTypes.string,
		loading: PropTypes.bool
	};

	constructor(props) {
		super(props);

		this.sid = props.navigation.state.params.room.sid;
		this.rid =
			props.rid ||
			props.navigation.state.params.room.rid ||
			realm.objectForPrimaryKey('subscriptions', this.sid).rid;

		this.data = realm
			.objects('messages')
			.filtered('_server.id = $0 AND rid = $1', this.props.server, this.rid)
			.sorted('ts', true);
		this.state = {
			slow: false,
			dataSource: ds.cloneWithRows([]),
			loaded: true,
			joined: typeof props.rid === 'undefined'
		};
	}

	componentWillMount() {
		this.props.navigation.setParams({
			title:
				this.props.name ||
				this.props.navigation.state.params.room.name ||
				realm.objectForPrimaryKey('subscriptions', this.sid).name
		});
		this.timer = setTimeout(() => this.setState({ slow: true }), 5000);
		this.props.openRoom(this.rid);
		this.data.addListener(this.updateState);
	}
	componentDidMount() {
		this.updateState();
	}
	componentDidUpdate() {
		return !this.props.loading && clearTimeout(this.timer);
	}
	componentWillUnmount() {
		clearTimeout(this.timer);
		this.data.removeAllListeners();
	}

	onEndReached = () => {
		const rowCount = this.state.dataSource.getRowCount();
		if (
			rowCount &&
			this.state.loaded &&
			this.state.loadingMore !== true &&
			this.state.end !== true
		) {
			this.setState({
				loadingMore: true
			});

			const lastRowData = this.data[rowCount - 1];
			RocketChat.loadMessagesForRoom(this.rid, lastRowData.ts, ({ end }) => {
				this.setState({
					loadingMore: false,
					end
				});
			});
		}
	};

	updateState = () => {
		this.setState({
			dataSource: ds.cloneWithRows(this.data)
		});
	};

	sendMessage = message => RocketChat.sendMessage(this.rid, message);

	joinRoom = async() => {
		await RocketChat.joinRoom(this.props.rid);
		this.setState({
			joined: true
		});
	};

	renderBanner = () =>
		(this.state.slow && this.props.loading ? (
			<View style={styles.bannerContainer}>
				<Text style={styles.bannerText}>Loading new messages...</Text>
			</View>
		) : null);

	renderItem = ({ item }) => (
		<Message
			id={item._id}
			item={item}
			baseUrl={this.props.Site_Url}
			Message_TimeFormat={this.props.Message_TimeFormat}
		/>
	);

	renderSeparator = () => <View style={styles.separator} />;

	renderFooter = () => {
		if (!this.state.joined) {
			return (
				<View>
					<Text>You are in preview mode.</Text>
					<Button title='Join' onPress={this.joinRoom} />
				</View>
			);
		}
		return <MessageBox ref={box => (this.box = box)} onSubmit={this.sendMessage} rid={this.rid} />;
	};

	renderHeader = () => {
		if (this.state.loadingMore) {
			return <Text style={styles.loadingMore}>Loading more messages...</Text>;
		}

		if (this.state.end) {
			return <Text style={styles.loadingMore}>Start of conversation</Text>;
		}
	};

	render() {
		const { height } = Dimensions.get('window');
		return (
			<KeyboardView contentContainerStyle={styles.container} keyboardVerticalOffset={64}>
				{this.renderBanner()}
				<SafeAreaView style={styles.safeAreaView}>
					<ListView
						enableEmptySections
						style={styles.list}
						onEndReachedThreshold={height / 2}
						renderFooter={this.renderHeader}
						onEndReached={this.onEndReached}
						dataSource={this.state.dataSource}
						renderRow={item => this.renderItem({ item })}
						initialListSize={10}
					/>
					{this.props.usersTyping ? <Text>{this.props.usersTyping.join(',')}</Text> : null}
				</SafeAreaView>
				{this.renderFooter()}
			</KeyboardView>
		);
	}
}