// @flow

import React, { PureComponent } from 'react';
import { Platform, TouchableOpacity } from 'react-native';
import Collapsible from 'react-native-collapsible';
import GestureRecognizer, { swipeDirections } from 'react-native-swipe-gestures';

import { ColorSchemeRegistry } from '../../../base/color-scheme';
import { BottomSheet, hideDialog, isDialogOpen } from '../../../base/dialog';
import { IconDragHandle } from '../../../base/icons';
import { CHAT_ENABLED, IOS_RECORDING_ENABLED, getFeatureFlag } from '../../../base/flags';
import { connect } from '../../../base/redux';
import { StyleType } from '../../../base/styles';
import { SharedDocumentButton } from '../../../etherpad';
import { InfoDialogButton, InviteButton } from '../../../invite';
import { AudioRouteButton } from '../../../mobile/audio-mode';
import { LiveStreamButton, RecordButton } from '../../../recording';
import { RoomLockButton } from '../../../room-lock';
import { ClosedCaptionButton } from '../../../subtitles';
import { TileViewButton } from '../../../video-layout';

import HelpButton from '../HelpButton';

import AudioOnlyButton from './AudioOnlyButton';
import RaiseHandButton from './RaiseHandButton';
import ToggleCameraButton from './ToggleCameraButton';
import styles from './styles';

/**
 * The type of the React {@code Component} props of {@link OverflowMenu}.
 */
type Props = {

    /**
     * The color-schemed stylesheet of the dialog feature.
     */
    _bottomSheetStyles: StyleType,

    /**
     * Whether the chat feature has been enabled. The meeting info button will be displayed in its place when disabled.
     */
    _chatEnabled: boolean,

    /**
     * True if the overflow menu is currently visible, false otherwise.
     */
    _isOpen: boolean,

    /**
     * Whether the recoding button should be enabled or not.
     */
    _recordingEnabled: boolean,

    /**
     * Used for hiding the dialog when the selection was completed.
     */
    dispatch: Function
};

type State = {

    /**
     * True if the 'more' button set needas to be rendered.
     */
    showMore: boolean
}

/**
 * The exported React {@code Component}. We need it to execute
 * {@link hideDialog}.
 *
 * XXX It does not break our coding style rule to not utilize globals for state,
 * because it is merely another name for {@code export}'s {@code default}.
 */
let OverflowMenu_; // eslint-disable-line prefer-const

/**
 * Implements a React {@code Component} with some extra actions in addition to
 * those in the toolbar.
 */
class OverflowMenu extends PureComponent<Props, State> {
    /**
     * Initializes a new {@code OverflowMenu} instance.
     *
     * @inheritdoc
     */
    constructor(props: Props) {
        super(props);

        this.state = {
            showMore: false
        };

        // Bind event handlers so they are only bound once per instance.
        this._onCancel = this._onCancel.bind(this);
        this._onSwipe = this._onSwipe.bind(this);
        this._onToggleMenu = this._onToggleMenu.bind(this);
        this._renderMenuExpandToggle = this._renderMenuExpandToggle.bind(this);
    }

    /**
     * Implements React's {@link Component#render()}.
     *
     * @inheritdoc
     * @returns {ReactElement}
     */
    render() {
        const { _bottomSheetStyles } = this.props;
        const { showMore } = this.state;

        const buttonProps = {
            afterClick: this._onCancel,
            showLabel: true,
            styles: _bottomSheetStyles.buttons
        };

        return (
            <BottomSheet
                onCancel = { this._onCancel }
                renderHeader = { this._renderMenuExpandToggle }>
                <AudioRouteButton { ...buttonProps } />
                <ToggleCameraButton { ...buttonProps } />
                <AudioOnlyButton { ...buttonProps } />
                <Collapsible collapsed = { !showMore }>
                    <RoomLockButton { ...buttonProps } />
                    <ClosedCaptionButton { ...buttonProps } />
                    {
                        this.props._recordingEnabled
                            && <RecordButton { ...buttonProps } />
                    }
                    <LiveStreamButton { ...buttonProps } />
                    <TileViewButton { ...buttonProps } />
                    <InviteButton { ...buttonProps } />
                    {
                        this.props._chatEnabled
                            && <InfoDialogButton { ...buttonProps } />
                    }
                    <RaiseHandButton { ...buttonProps } />
                    <SharedDocumentButton { ...buttonProps } />
                    <HelpButton { ...buttonProps } />
                </Collapsible>
            </BottomSheet>
        );
    }

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

    /**
     * Function to render the menu toggle in the bottom sheet header area.
     *
     * @returns {React$Element}
     */
    _renderMenuExpandToggle() {
        return (
            <GestureRecognizer
                config = {{
                    velocityThreshold: 0.1,
                    directionalOffsetThreshold: 30
                }}
                onSwipe = { this._onSwipe }
                style = { [
                    this.props._bottomSheetStyles.sheet,
                    styles.expandMenuContainer
                ] }>
                <TouchableOpacity onPress = { this._onToggleMenu }>
                    { /* $FlowFixMeProps */ }
                    <IconDragHandle style = { this.props._bottomSheetStyles.expandIcon } />
                </TouchableOpacity>
            </GestureRecognizer>
        );
    }

    _onCancel: () => boolean;

    /**
     * Hides this {@code OverflowMenu}.
     *
     * @private
     * @returns {boolean}
     */
    _onCancel() {
        if (this.props._isOpen) {
            this.props.dispatch(hideDialog(OverflowMenu_));

            return true;
        }

        return false;
    }

    _onSwipe: (string) => void;

    /**
     * Callback to be invoked when a swipe gesture is detected on the menu.
     *
     * @param {string} gestureName - The name of the swipe gesture.
     * @returns {void}
     */
    _onSwipe(gestureName) {
        const { showMore } = this.state;

        switch (gestureName) {
        case swipeDirections.SWIPE_UP:
            !showMore && this.setState({
                showMore: true
            });
            break;
        case swipeDirections.SWIPE_DOWN:
            if (showMore) {
                // If the menu is expanded, we collapse it.
                this.setState({
                    showMore: false
                });
            } else {
                // If the menu is not expanded, we close the menu
                this._onCancel();
            }
            break;
        }
    }

    _onToggleMenu: () => void;

    /**
     * Callback to be invoked when the expand menu button is pressed.
     *
     * @returns {void}
     */
    _onToggleMenu() {
        this.setState({
            showMore: !this.state.showMore
        });
    }
}

/**
 * Function that maps parts of Redux state tree into component props.
 *
 * @param {Object} state - Redux state.
 * @private
 * @returns {Props}
 */
function _mapStateToProps(state) {
    return {
        _bottomSheetStyles:
            ColorSchemeRegistry.get(state, 'BottomSheet'),
        _chatEnabled: getFeatureFlag(state, CHAT_ENABLED, true),
        _isOpen: isDialogOpen(state, OverflowMenu_),
        _recordingEnabled: Platform.OS !== 'ios' || getFeatureFlag(state, IOS_RECORDING_ENABLED)
    };
}

OverflowMenu_ = connect(_mapStateToProps)(OverflowMenu);

export default OverflowMenu_;