import React from 'react';
import { Keyboard } from 'react-native';
import PropTypes from 'prop-types';
import { Q } from '@nozbe/watermelondb';
import { withSafeAreaInsets } from 'react-native-safe-area-context';
import { connect } from 'react-redux';
import { FlatList } from 'react-native-gesture-handler';
import { HeaderBackButton } from '@react-navigation/stack';

import StatusBar from '../containers/StatusBar';
import RoomHeader from '../containers/RoomHeader';
import { withTheme } from '../theme';
import SearchHeader from './ThreadMessagesView/SearchHeader';
import log, { events, logEvent } from '../utils/log';
import database from '../lib/database';
import { getUserSelector } from '../selectors/login';
import { getHeaderTitlePosition } from '../containers/Header';
import * as HeaderButton from '../containers/HeaderButton';
import BackgroundContainer from '../containers/BackgroundContainer';
import SafeAreaView from '../containers/SafeAreaView';
import ActivityIndicator from '../containers/ActivityIndicator';
import RoomItem, { ROW_HEIGHT } from '../presentation/RoomItem';
import RocketChat from '../lib/rocketchat';
import { withDimensions } from '../dimensions';
import { isIOS } from '../utils/deviceInfo';
import { themes } from '../constants/colors';
import debounce from '../utils/debounce';
import { showErrorAlert } from '../utils/info';
import { goRoom } from '../utils/goRoom';
import I18n from '../i18n';

const API_FETCH_COUNT = 25;

const getItemLayout = (data, index) => ({
	length: data.length,
	offset: ROW_HEIGHT * index,
	index
});
const keyExtractor = item => item._id;

class TeamChannelsView extends React.Component {
	static propTypes = {
		route: PropTypes.object,
		navigation: PropTypes.object,
		isMasterDetail: PropTypes.bool,
		insets: PropTypes.object,
		theme: PropTypes.string,
		useRealName: PropTypes.bool,
		width: PropTypes.number,
		StoreLastMessage: PropTypes.bool
	}

	constructor(props) {
		super(props);
		this.teamId = props.route.params?.teamId;
		this.state = {
			loading: true,
			loadingMore: false,
			data: [],
			isSearching: false,
			searchText: '',
			search: [],
			end: false
		};
		this.loadTeam();
	}

	componentDidMount() {
		this.load();
	}

	loadTeam = async() => {
		const db = database.active;
		try {
			const subCollection = db.get('subscriptions');
			this.teamChannels = await subCollection.query(
				Q.where('team_id', Q.eq(this.teamId))
			);
			this.team = this.teamChannels?.find(channel => channel.teamMain);
			this.setHeader();

			if (!this.team) {
				throw new Error();
			}
		} catch {
			const { navigation } = this.props;
			navigation.pop();
			showErrorAlert(I18n.t('Team_not_found'));
		}
	}

	load = debounce(async() => {
		const {
			loadingMore, data, search, isSearching, searchText, end
		} = this.state;

		const length = isSearching ? search.length : data.length;
		if (loadingMore || end) {
			return;
		}

		this.setState({ loadingMore: true });
		try {
			const result = await RocketChat.getTeamListRoom({
				teamId: this.teamId,
				offset: length,
				count: API_FETCH_COUNT,
				type: 'all',
				filter: searchText
			});

			if (result.success) {
				const newState = {
					loading: false,
					loadingMore: false,
					end: result.rooms.length < API_FETCH_COUNT
				};
				const rooms = result.rooms.map((room) => {
					const record = this.teamChannels?.find(c => c.rid === room._id);
					return record ?? room;
				});
				if (isSearching) {
					newState.search = [...search, ...rooms];
				} else {
					newState.data = [...data, ...rooms];
				}

				this.setState(newState);
			} else {
				this.setState({ loading: false, loadingMore: false });
			}
		} catch (e) {
			log(e);
			this.setState({ loading: false, loadingMore: false });
		}
	}, 300)

	getHeader = () => {
		const { isSearching } = this.state;
		const {
			navigation, isMasterDetail, insets, theme
		} = this.props;

		const { team } = this;
		if (!team) {
			return;
		}

		const headerTitlePosition = getHeaderTitlePosition({ insets, numIconsRight: 1 });

		if (isSearching) {
			return {
				headerTitleAlign: 'left',
				headerLeft: () => (
					<HeaderButton.Container left>
						<HeaderButton.Item
							iconName='close'
							onPress={this.onCancelSearchPress}
						/>
					</HeaderButton.Container>
				),
				headerTitle: () => <SearchHeader onSearchChangeText={this.onSearchChangeText} />,
				headerTitleContainerStyle: {
					left: headerTitlePosition.left,
					right: headerTitlePosition.right
				},
				headerRight: () => null
			};
		}

		const options = {
			headerShown: true,
			headerTitleAlign: 'left',
			headerTitleContainerStyle: {
				left: headerTitlePosition.left,
				right: headerTitlePosition.right
			},
			headerTitle: () => (
				<RoomHeader
					title={RocketChat.getRoomTitle(team)}
					subtitle={team.topic}
					type={team.t}
					onPress={this.goRoomActionsView}
					teamMain
				/>
			)
		};

		if (isMasterDetail) {
			options.headerLeft = () => <HeaderButton.CloseModal navigation={navigation} />;
		} else {
			options.headerLeft = () => (
				<HeaderBackButton
					labelVisible={false}
					onPress={() => navigation.pop()}
					tintColor={themes[theme].headerTintColor}
				/>
			);
		}

		options.headerRight = () => (
			<HeaderButton.Container>
				<HeaderButton.Item iconName='search' onPress={this.onSearchPress} />
			</HeaderButton.Container>
		);
		return options;
	}

	setHeader = () => {
		const { navigation } = this.props;
		const options = this.getHeader();
		navigation.setOptions(options);
	}

	onSearchPress = () => {
		logEvent(events.TC_SEARCH);
		this.setState({ isSearching: true }, () => this.setHeader());
	}

	onSearchChangeText = debounce((searchText) => {
		this.setState({
			searchText, search: [], loading: !!searchText, loadingMore: false, end: false
		}, () => {
			if (searchText) {
				this.load();
			}
		});
	}, 300)

	onCancelSearchPress = () => {
		logEvent(events.TC_CANCEL_SEARCH);
		const { isSearching } = this.state;
		if (!isSearching) {
			return;
		}
		Keyboard.dismiss();
		this.setState({
			searchText: null, isSearching: false, search: [], loadingMore: false, end: false
		}, () => {
			this.setHeader();
		});
	};

	goRoomActionsView = (screen) => {
		logEvent(events.TC_GO_ACTIONS);
		const { team } = this;
		const {
			navigation, isMasterDetail
		} = this.props;
		if (isMasterDetail) {
			navigation.navigate('ModalStackNavigator', {
				screen: screen ?? 'RoomActionsView',
				params: {
					rid: team.rid, t: team.t, room: team, showCloseModal: false
				}
			});
		} else {
			navigation.navigate('RoomActionsView', {
				rid: team.rid, t: team.t, room: team
			});
		}
	}

	getRoomTitle = item => RocketChat.getRoomTitle(item)

	getRoomAvatar = item => RocketChat.getRoomAvatar(item)

	onPressItem = debounce(async(item) => {
		logEvent(events.TC_GO_ROOM);
		const { navigation, isMasterDetail } = this.props;
		try {
			let params = {};
			if (item.rid) {
				params = item;
			} else {
				const { room } = await RocketChat.getRoomInfo(item._id);
				params = {
					rid: item._id, name: RocketChat.getRoomTitle(room), joinCodeRequired: room.joinCodeRequired, t: room.t, teamId: room.teamId
				};
			}
			if (isMasterDetail) {
				navigation.pop();
			}
			goRoom({ item: params, isMasterDetail, navigationMethod: navigation.push });
		} catch (e) {
			// do nothing
		}
	}, 1000, true);

	renderItem = ({ item }) => {
		const {
			StoreLastMessage,
			useRealName,
			theme,
			width
		} = this.props;
		return (
			<RoomItem
				item={item}
				theme={theme}
				type={item.t}
				showLastMessage={StoreLastMessage}
				onPress={this.onPressItem}
				width={width}
				useRealName={useRealName}
				getRoomTitle={this.getRoomTitle}
				getRoomAvatar={this.getRoomAvatar}
				swipeEnabled={false}
			/>
		);
	};

	renderFooter = () => {
		const { loadingMore } = this.state;
		const { theme } = this.props;
		if (loadingMore) {
			return <ActivityIndicator theme={theme} />;
		}
		return null;
	}

	renderScroll = () => {
		const {
			loading, data, search, isSearching, searchText
		} = this.state;
		if (loading) {
			return <BackgroundContainer loading />;
		}
		if (isSearching && !search.length) {
			return <BackgroundContainer text={searchText ? I18n.t('No_team_channels_found') : ''} />;
		}
		if (!isSearching && !data.length) {
			return <BackgroundContainer text={I18n.t('No_team_channels_found')} />;
		}

		return (
			<FlatList
				data={isSearching ? search : data}
				extraData={isSearching ? search : data}
				keyExtractor={keyExtractor}
				renderItem={this.renderItem}
				getItemLayout={getItemLayout}
				removeClippedSubviews={isIOS}
				keyboardShouldPersistTaps='always'
				onEndReached={() => this.load()}
				onEndReachedThreshold={0.5}
				ListFooterComponent={this.renderFooter}
			/>
		);
	};

	render() {
		console.count(`${ this.constructor.name }.render calls`);
		return (
			<SafeAreaView testID='team-channels-view'>
				<StatusBar />
				{this.renderScroll()}
			</SafeAreaView>
		);
	}
}

const mapStateToProps = state => ({
	baseUrl: state.server.server,
	user: getUserSelector(state),
	useRealName: state.settings.UI_Use_Real_Name,
	isMasterDetail: state.app.isMasterDetail,
	StoreLastMessage: state.settings.Store_Last_Message
});

export default connect(mapStateToProps)(withDimensions(withSafeAreaInsets(withTheme(TeamChannelsView))));