import React from 'react';
import PropTypes from 'prop-types';
import {
	View, SectionList, Text, Alert
} from 'react-native';
import { connect } from 'react-redux';
import { SafeAreaView } from 'react-navigation';
import equal from 'deep-equal';

import { leaveRoom as leaveRoomAction } from '../../actions/room';
import styles from './styles';
import sharedStyles from '../Styles';
import Avatar from '../../containers/Avatar';
import Status from '../../containers/Status';
import Touch from '../../utils/touch';
import database, { safeAddListener } from '../../lib/realm';
import RocketChat from '../../lib/rocketchat';
import log from '../../utils/log';
import RoomTypeIcon from '../../containers/RoomTypeIcon';
import I18n from '../../i18n';
import scrollPersistTaps from '../../utils/scrollPersistTaps';
import { CustomIcon } from '../../lib/Icons';
import DisclosureIndicator from '../../containers/DisclosureIndicator';
import StatusBar from '../../containers/StatusBar';
import { COLOR_WHITE } from '../../constants/colors';

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

@connect(state => ({
	user: {
		id: state.login.user && state.login.user.id,
		token: state.login.user && state.login.user.token
	},
	baseUrl: state.settings.Site_Url || state.server ? state.server.server : ''
}), dispatch => ({
	leaveRoom: (rid, t) => dispatch(leaveRoomAction(rid, t))
}))
export default class RoomActionsView extends React.Component {
	static navigationOptions = {
		title: I18n.t('Actions')
	}

	static propTypes = {
		baseUrl: PropTypes.string,
		navigation: PropTypes.object,
		user: PropTypes.shape({
			id: PropTypes.string,
			token: PropTypes.string
		}),
		leaveRoom: PropTypes.func
	}

	constructor(props) {
		super(props);
		this.rid = props.navigation.getParam('rid');
		this.t = props.navigation.getParam('t');
		this.rooms = database.objects('subscriptions').filtered('rid = $0', this.rid);
		this.state = {
			room: this.rooms[0] || { rid: this.rid, t: this.t },
			membersCount: 0,
			member: {},
			joined: this.rooms.length > 0,
			canViewMembers: false
		};
	}

	async componentDidMount() {
		const { room } = this.state;
		if (!room._id) {
			try {
				const result = await RocketChat.getChannelInfo(room.rid);
				if (result.success) {
					this.setState({ room: { ...result.channel, rid: result.channel._id } });
				}
			} catch (error) {
				console.log('RoomActionsView -> getChannelInfo -> error', error);
			}
		}

		if (room && room.t !== 'd' && this.canViewMembers) {
			try {
				const counters = await RocketChat.getRoomCounters(room.rid, room.t);
				if (counters.success) {
					this.setState({ membersCount: counters.members, joined: counters.joined });
				}
			} catch (error) {
				console.log('RoomActionsView -> getRoomCounters -> error', error);
			}
		} else if (room.t === 'd') {
			this.updateRoomMember();
		}
		safeAddListener(this.rooms, this.updateRoom);
	}

	shouldComponentUpdate(nextProps, nextState) {
		const {
			room, membersCount, member, joined, canViewMembers
		} = this.state;
		if (nextState.membersCount !== membersCount) {
			return true;
		}
		if (nextState.joined !== joined) {
			return true;
		}
		if (nextState.canViewMembers !== canViewMembers) {
			return true;
		}
		if (!equal(nextState.room, room)) {
			return true;
		}
		if (!equal(nextState.member, member)) {
			return true;
		}
		return false;
	}

	componentWillUnmount() {
		this.rooms.removeAllListeners();
	}

	onPressTouchable = (item) => {
		if (item.route) {
			const { navigation } = this.props;
			navigation.navigate(item.route, item.params);
		}
		if (item.event) {
			return item.event();
		}
	}

	// TODO: move to componentDidMount
	get canAddUser() {
		const { room, joined } = this.state;
		const { rid, t } = room;

		const userInRoom = joined;
		const permissions = RocketChat.hasPermission(['add-user-to-joined-room', 'add-user-to-any-c-room', 'add-user-to-any-p-room'], rid);

		if (userInRoom && permissions['add-user-to-joined-room']) {
			return true;
		}
		if (t === 'c' && permissions['add-user-to-any-c-room']) {
			return true;
		}
		if (t === 'p' && permissions['add-user-to-any-p-room']) {
			return true;
		}
		return false;
	}

	// TODO: move to componentDidMount
	get canViewMembers() {
		const { room } = this.state;
		const { rid, t, broadcast } = room;
		if (broadcast) {
			const viewBroadcastMemberListPermission = 'view-broadcast-member-list';
			const permissions = RocketChat.hasPermission([viewBroadcastMemberListPermission], rid);
			if (!permissions[viewBroadcastMemberListPermission]) {
				return false;
			}
		}

		// This method is executed only in componentDidMount and returns a value
		// We save the state to read in render
		const result = (t === 'c' || t === 'p');
		this.setState({ canViewMembers: result });
		return result;
	}

	get sections() {
		const {
			room, membersCount, canViewMembers, joined
		} = this.state;
		const {
			rid, t, blocker, notifications
		} = room;

		const notificationsAction = {
			icon: notifications ? 'bell' : 'Bell-off',
			name: I18n.t(`${ notifications ? 'Enable' : 'Disable' }_notifications`),
			event: this.toggleNotifications,
			testID: 'room-actions-notifications'
		};

		const sections = [{
			data: [{
				icon: 'star',
				name: I18n.t('Room_Info'),
				route: 'RoomInfoView',
				// forward room only if room isn't joined
				params: { rid, t, room: joined ? null : room },
				testID: 'room-actions-info'
			}],
			renderItem: this.renderRoomInfo
		}, {
			data: [
				{
					icon: 'livechat',
					name: I18n.t('Voice_call'),
					disabled: true,
					testID: 'room-actions-voice'
				},
				{
					icon: 'video',
					name: I18n.t('Video_call'),
					disabled: true,
					testID: 'room-actions-video'
				}
			],
			renderItem: this.renderItem
		}, {
			data: [
				{
					icon: 'file-generic',
					name: I18n.t('Files'),
					route: 'MessagesView',
					params: { rid, t, name: 'Files' },
					testID: 'room-actions-files'
				},
				{
					icon: 'at',
					name: I18n.t('Mentions'),
					route: 'MessagesView',
					params: { rid, t, name: 'Mentions' },
					testID: 'room-actions-mentioned'
				},
				{
					icon: 'star',
					name: I18n.t('Starred'),
					route: 'MessagesView',
					params: { rid, t, name: 'Starred' },
					testID: 'room-actions-starred'
				},
				{
					icon: 'magnifier',
					name: I18n.t('Search'),
					route: 'SearchMessagesView',
					params: { rid },
					testID: 'room-actions-search'
				},
				{
					icon: 'share',
					name: I18n.t('Share'),
					disabled: true,
					testID: 'room-actions-share'
				},
				{
					icon: 'pin',
					name: I18n.t('Pinned'),
					route: 'MessagesView',
					params: { rid, t, name: 'Pinned' },
					testID: 'room-actions-pinned'
				}
			],
			renderItem: this.renderItem
		}];

		if (t === 'd') {
			sections.push({
				data: [
					{
						icon: 'ban',
						name: I18n.t(`${ blocker ? 'Unblock' : 'Block' }_user`),
						type: 'danger',
						event: this.toggleBlockUser,
						testID: 'room-actions-block-user'
					}
				],
				renderItem: this.renderItem
			});
			sections[2].data.push(notificationsAction);
		} else if (t === 'c' || t === 'p') {
			const actions = [];

			if (canViewMembers) {
				actions.push({
					icon: 'team',
					name: I18n.t('Members'),
					description: membersCount > 0 ? `${ membersCount } ${ I18n.t('members') }` : null,
					route: 'RoomMembersView',
					params: { rid },
					testID: 'room-actions-members'
				});
			}

			if (this.canAddUser) {
				actions.push({
					icon: 'user-plus',
					name: I18n.t('Add_user'),
					route: 'SelectedUsersView',
					params: {
						nextActionID: 'ADD_USER',
						rid,
						title: I18n.t('Add_user')
					},
					testID: 'room-actions-add-user'
				});
			}
			sections[2].data = [...actions, ...sections[2].data];

			if (joined) {
				sections[2].data.push(notificationsAction);
				sections.push({
					data: [
						{
							icon: 'sign-out',
							name: I18n.t('Leave_channel'),
							type: 'danger',
							event: this.leaveChannel,
							testID: 'room-actions-leave-channel'
						}
					],
					renderItem: this.renderItem
				});
			}
		}
		return sections;
	}

	updateRoom = () => {
		if (this.rooms.length > 0) {
			this.setState({ room: JSON.parse(JSON.stringify(this.rooms[0])) });
		}
	}

	updateRoomMember = async() => {
		const { room } = this.state;
		const { rid } = room;
		const { user } = this.props;

		try {
			const roomUserId = RocketChat.getRoomMemberId(rid, user.id);
			const result = await RocketChat.getUserInfo(roomUserId);
			if (result.success) {
				this.setState({ member: result.user });
			}
		} catch (e) {
			log('RoomActions updateRoomMember', e);
			this.setState({ member: {} });
		}
	}

	toggleBlockUser = () => {
		const { room } = this.state;
		const { rid, blocker } = room;
		const { member } = this.state;
		try {
			RocketChat.toggleBlockUser(rid, member._id, !blocker);
		} catch (e) {
			log('toggleBlockUser', e);
		}
	}

	leaveChannel = () => {
		const { room } = this.state;
		const { leaveRoom } = this.props;

		Alert.alert(
			I18n.t('Are_you_sure_question_mark'),
			I18n.t('Are_you_sure_you_want_to_leave_the_room', { room: room.t === 'd' ? room.fname : room.name }),
			[
				{
					text: I18n.t('Cancel'),
					style: 'cancel'
				},
				{
					text: I18n.t('Yes_action_it', { action: I18n.t('leave') }),
					style: 'destructive',
					onPress: () => leaveRoom(room.rid, room.t)
				}
			]
		);
	}

	toggleNotifications = () => {
		const { room } = this.state;
		try {
			const notifications = {
				mobilePushNotifications: room.notifications ? 'default' : 'nothing'
			};
			RocketChat.saveNotificationSettings(room.rid, notifications);
		} catch (e) {
			log('toggleNotifications', e);
		}
	}

	renderRoomInfo = ({ item }) => {
		const { room, member } = this.state;
		const { name, t, topic } = room;
		const { baseUrl, user } = this.props;

		return (
			this.renderTouchableItem([
				<Avatar
					key='avatar'
					text={name}
					size={50}
					style={styles.avatar}
					type={t}
					baseUrl={baseUrl}
					userId={user.id}
					token={user.token}
				>
					{t === 'd' && member._id ? <Status style={sharedStyles.status} id={member._id} /> : null }
				</Avatar>,
				<View key='name' style={styles.roomTitleContainer}>
					{room.t === 'd'
						? <Text style={styles.roomTitle}>{room.fname}</Text>
						: (
							<View style={styles.roomTitleRow}>
								<RoomTypeIcon type={room.prid ? 'discussion' : room.t} />
								<Text style={styles.roomTitle}>{room.prid ? room.fname : room.name}</Text>
							</View>
						)
					}
					<Text style={styles.roomDescription} ellipsizeMode='tail' numberOfLines={1}>{t === 'd' ? `@${ name }` : topic}</Text>
				</View>,
				<DisclosureIndicator key='disclosure-indicator' />
			], item)
		);
	}

	renderTouchableItem = (subview, item) => (
		<Touch
			onPress={() => this.onPressTouchable(item)}
			underlayColor={COLOR_WHITE}
			activeOpacity={0.5}
			accessibilityLabel={item.name}
			accessibilityTraits='button'
			testID={item.testID}
		>
			<View style={[styles.sectionItem, item.disabled && styles.sectionItemDisabled]}>
				{subview}
			</View>
		</Touch>
	)

	renderItem = ({ item }) => {
		const subview = item.type === 'danger' ? [
			<CustomIcon key='icon' name={item.icon} size={24} style={[styles.sectionItemIcon, styles.textColorDanger]} />,
			<Text key='name' style={[styles.sectionItemName, styles.textColorDanger]}>{ item.name }</Text>
		] : [
			<CustomIcon key='left-icon' name={item.icon} size={24} style={styles.sectionItemIcon} />,
			<Text key='name' style={styles.sectionItemName}>{ item.name }</Text>,
			item.description ? <Text key='description' style={styles.sectionItemDescription}>{ item.description }</Text> : null,
			<DisclosureIndicator key='disclosure-indicator' />
		];
		return this.renderTouchableItem(subview, item);
	}

	renderSectionSeparator = (data) => {
		if (data.trailingItem) {
			return <View style={[styles.sectionSeparator, data.leadingSection && styles.sectionSeparatorBorder]} />;
		}
		if (!data.trailingSection) {
			return <View style={styles.sectionSeparatorBorder} />;
		}
		return null;
	}

	render() {
		return (
			<SafeAreaView style={styles.container} testID='room-actions-view' forceInset={{ bottom: 'never' }}>
				<StatusBar />
				<SectionList
					contentContainerStyle={styles.contentContainer}
					style={styles.container}
					stickySectionHeadersEnabled={false}
					sections={this.sections}
					SectionSeparatorComponent={this.renderSectionSeparator}
					ItemSeparatorComponent={renderSeparator}
					keyExtractor={item => item.name}
					testID='room-actions-list'
					{...scrollPersistTaps}
				/>
			</SafeAreaView>
		);
	}
}