import React, { Component } from 'react';
import PropTypes from 'prop-types';
import {
	ScrollView, Text, View, FlatList, SafeAreaView
} from 'react-native';
import { connect } from 'react-redux';
import equal from 'deep-equal';
import { Q } from '@nozbe/watermelondb';

import Touch from '../../utils/touch';
import Avatar from '../../containers/Avatar';
import Status from '../../containers/Status/Status';
import RocketChat from '../../lib/rocketchat';
import log from '../../utils/log';
import I18n from '../../i18n';
import scrollPersistTaps from '../../utils/scrollPersistTaps';
import { CustomIcon } from '../../lib/Icons';
import styles from './styles';
import SidebarItem from './SidebarItem';
import { themes } from '../../constants/colors';
import database from '../../lib/database';
import { animateNextTransition } from '../../utils/layoutAnimation';
import { withTheme } from '../../theme';
import { withSplit } from '../../split';
import { getUserSelector } from '../../selectors/login';

const keyExtractor = item => item.id;

const Separator = React.memo(({ theme }) => <View style={[styles.separator, { borderColor: themes[theme].separatorColor }]} />);
Separator.propTypes = {
	theme: PropTypes.string
};

const permissions = [
	'view-statistics',
	'view-room-administration',
	'view-user-administration',
	'view-privileged-setting'
];

class Sidebar extends Component {
	static propTypes = {
		baseUrl: PropTypes.string,
		navigation: PropTypes.object,
		Site_Name: PropTypes.string.isRequired,
		user: PropTypes.object,
		activeItemKey: PropTypes.string,
		theme: PropTypes.string,
		loadingServer: PropTypes.bool,
		useRealName: PropTypes.bool,
		split: PropTypes.bool
	}

	constructor(props) {
		super(props);
		this.state = {
			showStatus: false,
			isAdmin: false,
			status: []
		};
	}

	componentDidMount() {
		this.setStatus();
		this.setIsAdmin();
	}

	componentWillReceiveProps(nextProps) {
		const { user, loadingServer } = this.props;
		if (nextProps.user && user && user.language !== nextProps.user.language) {
			this.setStatus();
		}
		if (loadingServer && nextProps.loadingServer !== loadingServer) {
			this.setIsAdmin();
		}
	}

	shouldComponentUpdate(nextProps, nextState) {
		const { status, showStatus, isAdmin } = this.state;
		const {
			Site_Name, user, baseUrl, activeItemKey, split, useRealName, theme
		} = this.props;
		if (nextState.showStatus !== showStatus) {
			return true;
		}
		if (nextProps.Site_Name !== Site_Name) {
			return true;
		}
		if (nextProps.Site_Name !== Site_Name) {
			return true;
		}
		if (nextProps.baseUrl !== baseUrl) {
			return true;
		}
		if (nextProps.activeItemKey !== activeItemKey) {
			return true;
		}
		if (nextProps.theme !== theme) {
			return true;
		}
		if (nextProps.user && user) {
			if (nextProps.user.language !== user.language) {
				return true;
			}
			if (nextProps.user.status !== user.status) {
				return true;
			}
			if (nextProps.user.username !== user.username) {
				return true;
			}
		}
		if (nextProps.split !== split) {
			return true;
		}
		if (nextProps.useRealName !== useRealName) {
			return true;
		}
		if (!equal(nextState.status, status)) {
			return true;
		}
		if (nextState.isAdmin !== isAdmin) {
			return true;
		}
		return false;
	}

	setStatus = () => {
		this.setState({
			status: [{
				id: 'online',
				name: I18n.t('Online')
			}, {
				id: 'busy',
				name: I18n.t('Busy')
			}, {
				id: 'away',
				name: I18n.t('Away')
			}, {
				id: 'offline',
				name: I18n.t('Invisible')
			}]
		});
	}

	async setIsAdmin() {
		const db = database.active;
		const { user } = this.props;
		const { roles } = user;
		try {
			if	(roles) {
				const permissionsCollection = db.collections.get('permissions');
				const permissionsFiltered = await permissionsCollection.query(Q.where('id', Q.oneOf(permissions))).fetch();
				const isAdmin = permissionsFiltered.reduce((result, permission) => (
					result || permission.roles.some(r => roles.indexOf(r) !== -1)),
				false);
				this.setState({ isAdmin });
			}
		} catch (e) {
			log(e);
		}
	}

	sidebarNavigate = (route) => {
		const { navigation } = this.props;
		navigation.navigate(route);
	}

	toggleStatus = () => {
		animateNextTransition();
		this.setState(prevState => ({ showStatus: !prevState.showStatus }));
	}

	renderStatusItem = ({ item }) => {
		const { user } = this.props;
		return (
			<SidebarItem
				text={item.name}
				left={<Status style={styles.status} size={12} status={item.id} />}
				current={user.status === item.id}
				onPress={() => {
					this.toggleStatus();
					if (user.status !== item.id) {
						try {
							RocketChat.setUserPresenceDefaultStatus(item.id);
						} catch (e) {
							log(e);
						}
					}
				}}
			/>
		);
	}

	renderNavigation = () => {
		const { isAdmin } = this.state;
		const { activeItemKey, theme } = this.props;
		return (
			<>
				<SidebarItem
					text={I18n.t('Chats')}
					left={<CustomIcon name='message' size={20} color={themes[theme].titleText} />}
					onPress={() => this.sidebarNavigate('RoomsListView')}
					testID='sidebar-chats'
					current={activeItemKey === 'ChatsStack'}
				/>
				<SidebarItem
					text={I18n.t('Profile')}
					left={<CustomIcon name='user' size={20} color={themes[theme].titleText} />}
					onPress={() => this.sidebarNavigate('ProfileView')}
					testID='sidebar-profile'
					current={activeItemKey === 'ProfileStack'}
				/>
				<SidebarItem
					text={I18n.t('Settings')}
					left={<CustomIcon name='cog' size={20} color={themes[theme].titleText} />}
					onPress={() => this.sidebarNavigate('SettingsView')}
					testID='sidebar-settings'
					current={activeItemKey === 'SettingsStack'}
				/>
				{isAdmin ? (
					<SidebarItem
						text={I18n.t('Admin_Panel')}
						left={<CustomIcon name='shield-alt' size={20} color={themes[theme].titleText} />}
						onPress={() => this.sidebarNavigate('AdminPanelView')}
						testID='sidebar-settings'
						current={activeItemKey === 'AdminPanelStack'}
					/>
				) : null}
			</>
		);
	}

	renderStatus = () => {
		const { status } = this.state;
		const { user } = this.props;
		return (
			<FlatList
				data={status}
				extraData={user}
				renderItem={this.renderStatusItem}
				keyExtractor={keyExtractor}
			/>
		);
	}

	render() {
		const { showStatus } = this.state;
		const {
			user, Site_Name, baseUrl, useRealName, split, theme
		} = this.props;

		if (!user) {
			return null;
		}
		return (
			<SafeAreaView testID='sidebar-view' style={[styles.container, { backgroundColor: themes[theme].focusedBackground }]}>
				<ScrollView
					style={[
						styles.container,
						{
							backgroundColor: split
								? themes[theme].backgroundColor
								: themes[theme].focusedBackground
						}
					]}
					{...scrollPersistTaps}
				>
					<Touch
						onPress={this.toggleStatus}
						testID='sidebar-toggle-status'
						style={styles.header}
						theme={theme}
					>
						<Avatar
							text={user.username}
							size={30}
							style={styles.avatar}
							baseUrl={baseUrl}
							userId={user.id}
							token={user.token}
						/>
						<View style={styles.headerTextContainer}>
							<View style={styles.headerUsername}>
								<Status style={styles.status} size={12} status={user && user.status} theme={theme} />
								<Text numberOfLines={1} style={[styles.username, { color: themes[theme].titleText }]}>{useRealName ? user.name : user.username}</Text>
							</View>
							<Text style={[styles.currentServerText, { color: themes[theme].titleText }]} numberOfLines={1}>{Site_Name}</Text>
						</View>
						<CustomIcon name='arrow-down' size={20} style={[styles.headerIcon, showStatus && styles.inverted, { color: themes[theme].titleText }]} />
					</Touch>

					{!split ? <Separator theme={theme} /> : null}

					{!showStatus && !split ? this.renderNavigation() : null}
					{showStatus ? this.renderStatus() : null}
					{!split ? <Separator theme={theme} /> : null}
				</ScrollView>
			</SafeAreaView>
		);
	}
}

const mapStateToProps = state => ({
	Site_Name: state.settings.Site_Name,
	user: getUserSelector(state),
	baseUrl: state.server.server,
	loadingServer: state.server.loading,
	useRealName: state.settings.UI_Use_Real_Name
});

export default connect(mapStateToProps)(withTheme(withSplit(Sidebar)));