import React from 'react';
import PropTypes from 'prop-types';
import {
	View, StyleSheet, FlatList, Text, Image
} from 'react-native';
import { connect } from 'react-redux';
import SafeAreaView from 'react-native-safe-area-view';
import equal from 'deep-equal';

import Navigation from '../lib/Navigation';
import database from '../lib/realm';
import RocketChat from '../lib/rocketchat';
import UserItem from '../presentation/UserItem';
import debounce from '../utils/debounce';
import LoggedView from './View';
import sharedStyles from './Styles';
import I18n from '../i18n';
import Touch from '../utils/touch';
import { isIOS, isAndroid } from '../utils/deviceInfo';
import SearchBox from '../containers/SearchBox';
import Icons from '../lib/Icons';

const styles = StyleSheet.create({
	safeAreaView: {
		flex: 1,
		backgroundColor: isIOS ? '#F7F8FA' : '#E1E5E8'
	},
	separator: {
		marginLeft: 60
	},
	createChannelButton: {
		marginVertical: 25
	},
	createChannelContainer: {
		height: 47,
		backgroundColor: '#fff',
		flexDirection: 'row',
		alignItems: 'center'
	},
	createChannelIcon: {
		width: 24,
		height: 24,
		marginHorizontal: 18
	},
	createChannelText: {
		color: '#1D74F5',
		fontSize: 18
	}
});

@connect(state => ({
	baseUrl: state.settings.Site_Url || state.server ? state.server.server : ''
}))
/** @extends React.Component */
export default class NewMessageView extends LoggedView {
	static options() {
		return {
			topBar: {
				leftButtons: [{
					id: 'cancel',
					icon: isAndroid ? Icons.getSource('back') : undefined,
					text: isIOS ? I18n.t('Cancel') : undefined
				}]
			}
		};
	}

	static propTypes = {
		componentId: PropTypes.string,
		baseUrl: PropTypes.string,
		onPressItem: PropTypes.func.isRequired
	};

	constructor(props) {
		super('NewMessageView', props);
		this.data = database.objects('subscriptions').filtered('t = $0', 'd').sorted('roomUpdatedAt', true);
		this.state = {
			search: []
		};
		this.data.addListener(this.updateState);
		Navigation.events().bindComponent(this);
	}

	shouldComponentUpdate(nextProps, nextState) {
		const { search } = this.state;
		if (!equal(nextState.search, search)) {
			return true;
		}
		return false;
	}

	componentWillUnmount() {
		this.updateState.stop();
		this.data.removeAllListeners();
	}

	onSearchChangeText(text) {
		this.search(text);
	}

	onPressItem = async(item) => {
		const { onPressItem } = this.props;
		await this.dismiss();
		onPressItem(item);
	}

	navigationButtonPressed = ({ buttonId }) => {
		if (buttonId === 'cancel') {
			this.dismiss();
		}
	}

	dismiss = () => {
		const { componentId } = this.props;
		return Navigation.dismissModal(componentId);
	}

	// eslint-disable-next-line react/sort-comp
	updateState = debounce(() => {
		this.forceUpdate();
	}, 1000);

	search = async(text) => {
		const result = await RocketChat.search({ text, filterRooms: false });
		this.setState({
			search: result
		});
	}

	createChannel = () => {
		const { componentId } = this.props;
		Navigation.push(componentId, {
			component: {
				name: 'SelectedUsersView',
				passProps: {
					nextAction: 'CREATE_CHANNEL'
				},
				options: {
					topBar: {
						title: {
							text: I18n.t('Select_Users')
						}
					}
				}
			}
		});
	}

	renderHeader = () => (
		<View>
			<SearchBox onChangeText={text => this.onSearchChangeText(text)} testID='new-message-view-search' />
			<Touch onPress={this.createChannel} style={styles.createChannelButton} testID='new-message-view-create-channel'>
				<View style={[sharedStyles.separatorVertical, styles.createChannelContainer]}>
					<Image style={styles.createChannelIcon} source={{ uri: 'plus' }} />
					<Text style={styles.createChannelText}>{I18n.t('Create_Channel')}</Text>
				</View>
			</Touch>
		</View>
	)

	renderSeparator = () => <View style={[sharedStyles.separator, styles.separator]} />;

	renderItem = ({ item, index }) => {
		const { search } = this.state;
		const { baseUrl } = this.props;

		let style = {};
		if (index === 0) {
			style = { ...sharedStyles.separatorTop };
		}
		if (search.length > 0 && index === search.length - 1) {
			style = { ...style, ...sharedStyles.separatorBottom };
		}
		if (search.length === 0 && index === this.data.length - 1) {
			style = { ...style, ...sharedStyles.separatorBottom };
		}
		return (
			<UserItem
				name={item.search ? item.name : item.fname}
				username={item.search ? item.username : item.name}
				onPress={() => this.onPressItem(item)}
				baseUrl={baseUrl}
				testID={`new-message-view-item-${ item.name }`}
				style={style}
			/>
		);
	}

	renderList = () => {
		const { search } = this.state;
		return (
			<FlatList
				data={search.length > 0 ? search : this.data}
				extraData={this.state}
				keyExtractor={item => item._id}
				ListHeaderComponent={this.renderHeader}
				renderItem={this.renderItem}
				ItemSeparatorComponent={this.renderSeparator}
				keyboardShouldPersistTaps='always'
			/>
		);
	}

	render = () => (
		<SafeAreaView style={styles.safeAreaView} testID='new-message-view' forceInset={{ bottom: 'never' }}>
			{this.renderList()}
		</SafeAreaView>
	);
}