// @flow

import { DrawerActions } from '@react-navigation/native';
import React from 'react';
import {
    Animated,
    SafeAreaView,
    TextInput,
    TouchableHighlight,
    TouchableOpacity,
    View
} from 'react-native';

import { getName } from '../../app/functions';
import { ColorSchemeRegistry } from '../../base/color-scheme';
import { translate } from '../../base/i18n';
import { Icon, IconMenu, IconWarning } from '../../base/icons';
import JitsiStatusBar from '../../base/modal/components/JitsiStatusBar';
import { LoadingIndicator, Text } from '../../base/react';
import { connect } from '../../base/redux';
import BaseTheme from '../../base/ui/components/BaseTheme.native';

import {
    AbstractWelcomePage,
    _mapStateToProps as _abstractMapStateToProps,
    type Props as AbstractProps
} from './AbstractWelcomePage';
import VideoSwitch from './VideoSwitch';
import WelcomePageTabs from './WelcomePageTabs';
import styles, { PLACEHOLDER_TEXT_COLOR } from './styles';


type Props = AbstractProps & {

    /**
     * The color schemed style of the Header component.
     */
    _headerStyles: Object,

    /**
     * Default prop for navigating between screen components(React Navigation).
     */
    navigation: Object,

    /**
     * Default prop for navigating between screen components(React Navigation).
     */
    route: Object,

    /**
     * The translate function.
     */
    t: Function
};

/**
 * The native container rendering the welcome page.
 *
 * @augments AbstractWelcomePage
 */
class WelcomePage extends AbstractWelcomePage<*> {
    /**
     * Constructor of the Component.
     *
     * @inheritdoc
     */
    constructor(props: Props) {
        super(props);

        // $FlowExpectedError
        this.state._fieldFocused = false;

        // $FlowExpectedError
        this.state.hintBoxAnimation = new Animated.Value(0);

        // Bind event handlers so they are only bound once per instance.
        this._onFieldFocusChange = this._onFieldFocusChange.bind(this);
        this._renderHintBox = this._renderHintBox.bind(this);

        // Specially bind functions to avoid function definition on render.
        this._onFieldBlur = this._onFieldFocusChange.bind(this, false);
        this._onFieldFocus = this._onFieldFocusChange.bind(this, true);
    }

    _onFieldBlur: () => void;

    _onFieldFocus: () => void;

    _onJoin: () => void;

    _onRoomChange: (string) => void;

    _updateRoomname: () => void;

    /**
     * Implements React's {@link Component#componentDidMount()}. Invoked
     * immediately after mounting occurs. Creates a local video track if none
     * is available and the camera permission was already granted.
     *
     * @inheritdoc
     * @returns {void}
     */
    componentDidMount() {
        super.componentDidMount();

        this._updateRoomname();

        const {
            _headerStyles,
            navigation
        } = this.props;

        navigation.setOptions({
            headerLeft: () => (
                <TouchableOpacity
                    /* eslint-disable-next-line react/jsx-no-bind */
                    onPress = { () =>
                        navigation.dispatch(DrawerActions.openDrawer()) }
                    style = { styles.drawerNavigationIcon }>
                    <Icon
                        size = { 20 }
                        src = { IconMenu }
                        style = { _headerStyles.headerButtonIcon } />
                </TouchableOpacity>
            ),
            // eslint-disable-next-line react/no-multi-comp
            headerRight: () =>
                <VideoSwitch />
        });
    }

    /**
     * Implements React's {@link Component#render()}. Renders a prompt for
     * entering a room name.
     *
     * @inheritdoc
     * @returns {ReactElement}
     */
    render() {
        // We want to have the welcome page support the reduced UI layout,
        // but we ran into serious issues enabling it so we disable it
        // until we have a proper fix in place. We leave the code here though, because
        // this part should be fine when the bug is fixed.
        //
        // NOTE: when re-enabling, don't forget to uncomment the respective _mapStateToProps line too

        /*
        const { _reducedUI } = this.props;

        if (_reducedUI) {
            return this._renderReducedUI();
        }
        */

        return this._renderFullUI();
    }

    /**
     * Renders the insecure room name warning.
     *
     * @inheritdoc
     */
    _doRenderInsecureRoomNameWarning() {
        return (
            <View
                style = { [
                    styles.messageContainer,
                    styles.insecureRoomNameWarningContainer
                ] }>
                <Icon
                    src = { IconWarning }
                    style = { styles.insecureRoomNameWarningIcon } />
                <Text style = { styles.insecureRoomNameWarningText }>
                    { this.props.t('security.insecureRoomNameWarning') }
                </Text>
            </View>
        );
    }

    /**
     * Constructs a style array to handle the hint box animation.
     *
     * @private
     * @returns {Array<Object>}
     */
    _getHintBoxStyle() {
        return [
            styles.messageContainer,
            styles.hintContainer,
            {
                // $FlowExpectedError
                opacity: this.state.hintBoxAnimation
            }
        ];
    }

    _onFieldFocusChange: (boolean) => void;

    /**
     * Callback for when the room field's focus changes so the hint box
     * must be rendered or removed.
     *
     * @private
     * @param {boolean} focused - The focused state of the field.
     * @returns {void}
     */
    _onFieldFocusChange(focused) {
        if (focused) {
            // Stop placeholder animation.
            // $FlowExpectedError
            this._clearTimeouts();
            this.setState({
                _fieldFocused: true,
                roomPlaceholder: ''
            });
        } else {
            // Restart room placeholder animation.
            this._updateRoomname();
        }

        Animated.timing(

            // $FlowExpectedError
            this.state.hintBoxAnimation,

            // $FlowExpectedError
            {
                duration: 300,
                toValue: focused ? 1 : 0
            })
            .start(animationState =>

                // $FlowExpectedError
                animationState.finished

                // $FlowExpectedError
                && !focused
                    && this.setState({
                        _fieldFocused: false
                    }));
    }

    _renderHintBox: () => React$Element<any>;

    /**
     * Renders the hint box if necessary.
     *
     * @private
     * @returns {React$Node}
     */
    _renderHintBox() {
        const { t } = this.props;

        // $FlowExpectedError
        if (this.state._fieldFocused) {
            return (
                <Animated.View style = { this._getHintBoxStyle() }>
                    <View style = { styles.hintTextContainer } >
                        <Text style = { styles.hintText }>
                            { t('welcomepage.roomnameHint') }
                        </Text>
                    </View>
                    <View style = { styles.hintButtonContainer } >
                        { this._renderJoinButton() }
                    </View>
                </Animated.View>
            );
        }

        return null;
    }

    /**
     * Renders the join button.
     *
     * @private
     * @returns {ReactElement}
     */
    _renderJoinButton() {
        const { t } = this.props;
        let children;


        if (this.state.joining) {
            // TouchableHighlight is picky about what its children can be, so
            // wrap it in a native component, i.e. View to avoid having to
            // modify non-native children.
            children = (
                <View>
                    <LoadingIndicator
                        color = { styles.buttonText.color }
                        size = 'small' />
                </View>
            );
        } else {
            children = (
                <Text style = { styles.buttonText }>
                    { this.props.t('welcomepage.join') }
                </Text>
            );
        }

        return (
            <TouchableHighlight
                accessibilityLabel =
                    { t('welcomepage.accessibilityLabel.join') }
                onPress = { this._onJoin }
                style = { styles.button }
                underlayColor = { BaseTheme.palette.ui12 }>
                { children }
            </TouchableHighlight>
        );
    }

    /**
     * Renders the full welcome page.
     *
     * @returns {ReactElement}
     */
    _renderFullUI() {
        const roomnameAccLabel = 'welcomepage.accessibilityLabel.roomname';
        const { t } = this.props;

        return (
            <>
                <JitsiStatusBar />
                <View style = { styles.welcomePage }>
                    <SafeAreaView style = { styles.roomContainer } >
                        <View style = { styles.joinControls } >
                            <Text style = { styles.enterRoomText }>
                                { t('welcomepage.roomname') }
                            </Text>
                            {/* // $FlowExpectedError*/}
                            <TextInput
                                accessibilityLabel = { t(roomnameAccLabel) }
                                autoCapitalize = { 'none' }
                                autoComplete = { 'off' }
                                autoCorrect = { false }
                                autoFocus = { false }
                                onBlur = { this._onFieldBlur }
                                onChangeText = { this._onRoomChange }
                                onFocus = { this._onFieldFocus }
                                onSubmitEditing = { this._onJoin }
                                placeholder = { this.state.roomPlaceholder }
                                placeholderTextColor = { PLACEHOLDER_TEXT_COLOR }
                                returnKeyType = { 'go' }
                                spellCheck = { false }
                                style = { styles.textInput }
                                underlineColorAndroid = 'transparent'
                                value = { this.state.room } />
                            {

                                // $FlowExpectedError
                                this._renderInsecureRoomNameWarning()
                            }
                            {
                                this._renderHintBox()
                            }
                        </View>
                    </SafeAreaView>
                    {/* // $FlowExpectedError*/}
                    <WelcomePageTabs disabled = { this.state._fieldFocused } />
                </View>
            </>
        );
    }

    /**
     * Renders a "reduced" version of the welcome page.
     *
     * @returns {ReactElement}
     */
    _renderReducedUI() {
        const { t } = this.props;

        return (
            <View style = { styles.reducedUIContainer }>
                <Text style = { styles.reducedUIText }>
                    { t('welcomepage.reducedUIText', { app: getName() }) }
                </Text>
            </View>
        );
    }
}

/**
 * Maps part of the Redux state to the props of this component.
 *
 * @param {Object} state - The Redux state.
 * @returns {Object}
 */
function _mapStateToProps(state) {
    return {
        ..._abstractMapStateToProps(state),
        _headerStyles: ColorSchemeRegistry.get(state, 'Header')

        // _reducedUI: state['features/base/responsive-ui'].reducedUI
    };
}

export default translate(connect(_mapStateToProps)(WelcomePage));