/*
Copyright 2021 - 2022 The Matrix.org Foundation C.I.C.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

import React from 'react';
import { IEventRelation, MatrixEvent } from 'matrix-js-sdk/src/models/event';
import { EventTimelineSet } from 'matrix-js-sdk/src/models/event-timeline-set';
import { NotificationCountType, Room } from 'matrix-js-sdk/src/models/room';
import { Thread } from 'matrix-js-sdk/src/models/thread';

import BaseCard from "./BaseCard";
import ResizeNotifier from '../../../utils/ResizeNotifier';
import MessageComposer from '../rooms/MessageComposer';
import { RoomPermalinkCreator } from '../../../utils/permalinks/Permalinks';
import { Layout } from '../../../settings/enums/Layout';
import TimelinePanel from '../../structures/TimelinePanel';
import { E2EStatus } from '../../../utils/ShieldUtils';
import EditorStateTransfer from '../../../utils/EditorStateTransfer';
import RoomContext, { TimelineRenderingType } from '../../../contexts/RoomContext';
import dis from '../../../dispatcher/dispatcher';
import { _t } from '../../../languageHandler';
import { ActionPayload } from '../../../dispatcher/payloads';
import { Action } from '../../../dispatcher/actions';
import ContentMessages from '../../../ContentMessages';
import UploadBar from '../../structures/UploadBar';
import SettingsStore from '../../../settings/SettingsStore';
import JumpToBottomButton from '../rooms/JumpToBottomButton';
import { ViewRoomPayload } from "../../../dispatcher/payloads/ViewRoomPayload";
import Measured from '../elements/Measured';
import Heading from '../typography/Heading';
import { UPDATE_EVENT } from '../../../stores/AsyncStore';
import { SdkContextClass } from '../../../contexts/SDKContext';

interface IProps {
    room: Room;
    onClose: () => void;
    resizeNotifier: ResizeNotifier;
    permalinkCreator?: RoomPermalinkCreator;
    e2eStatus?: E2EStatus;
    classNames?: string;
    timelineSet?: EventTimelineSet;
    timelineRenderingType?: TimelineRenderingType;
    showComposer?: boolean;
    composerRelation?: IEventRelation;
}

interface IState {
    thread?: Thread;
    editState?: EditorStateTransfer;
    replyToEvent?: MatrixEvent;
    initialEventId?: string;
    isInitialEventHighlighted?: boolean;
    layout: Layout;
    atEndOfLiveTimeline: boolean;
    narrow: boolean;

    // settings:
    showReadReceipts?: boolean;
}

export default class TimelineCard extends React.Component<IProps, IState> {
    static contextType = RoomContext;

    private dispatcherRef: string;
    private layoutWatcherRef: string;
    private timelinePanel = React.createRef<TimelinePanel>();
    private card = React.createRef<HTMLDivElement>();
    private readReceiptsSettingWatcher: string;

    constructor(props: IProps) {
        super(props);
        this.state = {
            showReadReceipts: SettingsStore.getValue("showReadReceipts", props.room.roomId),
            layout: SettingsStore.getValue("layout"),
            atEndOfLiveTimeline: true,
            narrow: false,
        };
        this.readReceiptsSettingWatcher = null;
    }

    public componentDidMount(): void {
        SdkContextClass.instance.roomViewStore.addListener(UPDATE_EVENT, this.onRoomViewStoreUpdate);
        this.dispatcherRef = dis.register(this.onAction);
        this.readReceiptsSettingWatcher = SettingsStore.watchSetting("showReadReceipts", null, (...[,,, value]) =>
            this.setState({ showReadReceipts: value as boolean }),
        );
        this.layoutWatcherRef = SettingsStore.watchSetting("layout", null, (...[,,, value]) =>
            this.setState({ layout: value as Layout }),
        );
    }

    public componentWillUnmount(): void {
        SdkContextClass.instance.roomViewStore.removeListener(UPDATE_EVENT, this.onRoomViewStoreUpdate);

        if (this.readReceiptsSettingWatcher) {
            SettingsStore.unwatchSetting(this.readReceiptsSettingWatcher);
        }
        if (this.layoutWatcherRef) {
            SettingsStore.unwatchSetting(this.layoutWatcherRef);
        }

        dis.unregister(this.dispatcherRef);
    }

    private onRoomViewStoreUpdate = async (initial?: boolean): Promise<void> => {
        const newState: Pick<IState, any> = {
            initialEventId: SdkContextClass.instance.roomViewStore.getInitialEventId(),
            isInitialEventHighlighted: SdkContextClass.instance.roomViewStore.isInitialEventHighlighted(),
            replyToEvent: SdkContextClass.instance.roomViewStore.getQuotingEvent(),
        };

        this.setState(newState);
    };

    private onAction = (payload: ActionPayload): void => {
        switch (payload.action) {
            case Action.EditEvent:
                this.setState({
                    editState: payload.event ? new EditorStateTransfer(payload.event) : null,
                }, () => {
                    if (payload.event) {
                        this.timelinePanel.current?.scrollToEventIfNeeded(payload.event.getId());
                    }
                });
                break;
            default:
                break;
        }
    };

    private onScroll = (): void => {
        const timelinePanel = this.timelinePanel.current;
        if (!timelinePanel) return;
        if (timelinePanel.isAtEndOfLiveTimeline()) {
            this.setState({
                atEndOfLiveTimeline: true,
            });
        } else {
            this.setState({
                atEndOfLiveTimeline: false,
            });
        }

        if (this.state.initialEventId && this.state.isInitialEventHighlighted) {
            dis.dispatch<ViewRoomPayload>({
                action: Action.ViewRoom,
                room_id: this.props.room.roomId,
                event_id: this.state.initialEventId,
                highlighted: false,
                replyingToEvent: this.state.replyToEvent,
                metricsTrigger: undefined, // room doesn't change
            });
        }
    };

    private onMeasurement = (narrow: boolean): void => {
        this.setState({ narrow });
    };

    private jumpToLiveTimeline = () => {
        if (this.state.initialEventId && this.state.isInitialEventHighlighted) {
            // If we were viewing a highlighted event, firing view_room without
            // an event will take care of both clearing the URL fragment and
            // jumping to the bottom
            dis.dispatch({
                action: Action.ViewRoom,
                room_id: this.props.room.roomId,
            });
        } else {
            // Otherwise we have to jump manually
            this.timelinePanel.current?.jumpToLiveTimeline();
            dis.fire(Action.FocusSendMessageComposer);
        }
    };

    private renderTimelineCardHeader = (): JSX.Element => {
        return <div className="mx_BaseCard_header_title">
            <Heading size="h4" className="mx_BaseCard_header_title_heading">{ _t("Chat") }</Heading>
        </div>;
    };

    public render(): JSX.Element {
        const highlightedEventId = this.state.isInitialEventHighlighted
            ? this.state.initialEventId
            : null;

        let jumpToBottom;
        if (!this.state.atEndOfLiveTimeline) {
            jumpToBottom = (<JumpToBottomButton
                highlight={this.props.room.getUnreadNotificationCount(NotificationCountType.Highlight) > 0}
                onScrollToBottomClick={this.jumpToLiveTimeline}
            />);
        }

        const isUploading = ContentMessages.sharedInstance().getCurrentUploads(this.props.composerRelation).length > 0;

        const myMembership = this.props.room.getMyMembership();
        const showComposer = myMembership === "join";

        return (
            <RoomContext.Provider value={{
                ...this.context,
                timelineRenderingType: this.props.timelineRenderingType ?? this.context.timelineRenderingType,
                liveTimeline: this.props.timelineSet.getLiveTimeline(),
                narrow: this.state.narrow,
            }}>
                <BaseCard
                    className={this.props.classNames}
                    onClose={this.props.onClose}
                    withoutScrollContainer={true}
                    header={this.renderTimelineCardHeader()}
                    ref={this.card}
                >
                    <Measured
                        sensor={this.card.current}
                        onMeasurement={this.onMeasurement}
                    />
                    <div className="mx_TimelineCard_timeline">
                        { jumpToBottom }
                        <TimelinePanel
                            ref={this.timelinePanel}
                            showReadReceipts={this.state.showReadReceipts}
                            manageReadReceipts={true}
                            manageReadMarkers={false} // No RM support in the TimelineCard
                            sendReadReceiptOnLoad={true}
                            timelineSet={this.props.timelineSet}
                            showUrlPreview={this.context.showUrlPreview}
                            // The right panel timeline (and therefore threads) don't support IRC layout at this time
                            layout={this.state.layout === Layout.Bubble ? Layout.Bubble : Layout.Group}
                            hideThreadedMessages={false}
                            hidden={false}
                            showReactions={true}
                            className="mx_RoomView_messagePanel"
                            permalinkCreator={this.props.permalinkCreator}
                            membersLoaded={true}
                            editState={this.state.editState}
                            eventId={this.state.initialEventId}
                            resizeNotifier={this.props.resizeNotifier}
                            highlightedEventId={highlightedEventId}
                            onScroll={this.onScroll}
                        />
                    </div>

                    { isUploading && (
                        <UploadBar room={this.props.room} relation={this.props.composerRelation} />
                    ) }

                    { showComposer && (
                        <MessageComposer
                            room={this.props.room}
                            relation={this.props.composerRelation}
                            resizeNotifier={this.props.resizeNotifier}
                            replyToEvent={this.state.replyToEvent}
                            permalinkCreator={this.props.permalinkCreator}
                            e2eStatus={this.props.e2eStatus}
                            compact={true}
                        />
                    ) }
                </BaseCard>
            </RoomContext.Provider>
        );
    }
}
