/*
Copyright 2020 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, {
    ChangeEvent,
    SyntheticEvent,
    useCallback,
    useContext,
    useEffect,
    useMemo,
    useRef,
    useState,
} from "react";
import classNames from "classnames";
import {
    MenuItem,
    Separator,
    ToggleMenuItem,
    Text,
    Badge,
    Heading,
    IconButton,
    Link,
    Search,
    Form,
} from "@vector-im/compound-web";
import FavouriteIcon from "@vector-im/compound-design-tokens/assets/web/icons/favourite";
import { Icon as UserAddIcon } from "@vector-im/compound-design-tokens/icons/user-add.svg";
import LinkIcon from "@vector-im/compound-design-tokens/assets/web/icons/link";
import SettingsIcon from "@vector-im/compound-design-tokens/assets/web/icons/settings";
import { Icon as ExportArchiveIcon } from "@vector-im/compound-design-tokens/icons/export-archive.svg";
import LeaveIcon from "@vector-im/compound-design-tokens/assets/web/icons/leave";
import FilesIcon from "@vector-im/compound-design-tokens/assets/web/icons/files";
import PollsIcon from "@vector-im/compound-design-tokens/assets/web/icons/polls";
import PinIcon from "@vector-im/compound-design-tokens/assets/web/icons/pin";
import { Icon as LockIcon } from "@vector-im/compound-design-tokens/icons/lock-solid.svg";
import { Icon as LockOffIcon } from "@vector-im/compound-design-tokens/icons/lock-off.svg";
import PublicIcon from "@vector-im/compound-design-tokens/assets/web/icons/public";
import ErrorIcon from "@vector-im/compound-design-tokens/assets/web/icons/error";
import { Icon as ChevronDownIcon } from "@vector-im/compound-design-tokens/icons/chevron-down.svg";
import { EventType, JoinRule, Room, RoomStateEvent } from "matrix-js-sdk/src/matrix";

import MatrixClientContext from "../../../contexts/MatrixClientContext";
import { useIsEncrypted } from "../../../hooks/useIsEncrypted";
import BaseCard, { Group } from "./BaseCard";
import { _t } from "../../../languageHandler";
import RoomAvatar from "../avatars/RoomAvatar";
import AccessibleButton from "../elements/AccessibleButton";
import defaultDispatcher from "../../../dispatcher/dispatcher";
import { RightPanelPhases } from "../../../stores/right-panel/RightPanelStorePhases";
import Modal from "../../../Modal";
import ShareDialog from "../dialogs/ShareDialog";
import { useEventEmitter, useEventEmitterState } from "../../../hooks/useEventEmitter";
import WidgetUtils from "../../../utils/WidgetUtils";
import { IntegrationManagers } from "../../../integrations/IntegrationManagers";
import SettingsStore from "../../../settings/SettingsStore";
import WidgetAvatar from "../avatars/WidgetAvatar";
import WidgetStore, { IApp } from "../../../stores/WidgetStore";
import { E2EStatus } from "../../../utils/ShieldUtils";
import { RoomPermalinkCreator } from "../../../utils/permalinks/Permalinks";
import RoomContext, { TimelineRenderingType } from "../../../contexts/RoomContext";
import { UIComponent, UIFeature } from "../../../settings/UIFeature";
import { ChevronFace, ContextMenuTooltipButton, useContextMenu } from "../../structures/ContextMenu";
import { WidgetContextMenu } from "../context_menus/WidgetContextMenu";
import { useFeatureEnabled } from "../../../hooks/useSettings";
import { usePinnedEvents } from "./PinnedMessagesCard";
import { Container, MAX_PINNED, WidgetLayoutStore } from "../../../stores/widgets/WidgetLayoutStore";
import RoomName from "../elements/RoomName";
import UIStore from "../../../stores/UIStore";
import ExportDialog from "../dialogs/ExportDialog";
import RightPanelStore from "../../../stores/right-panel/RightPanelStore";
import PosthogTrackers from "../../../PosthogTrackers";
import { shouldShowComponent } from "../../../customisations/helpers/UIComponents";
import { PollHistoryDialog } from "../dialogs/PollHistoryDialog";
import { Flex } from "../../utils/Flex";
import RoomListStore, { LISTS_UPDATE_EVENT } from "../../../stores/room-list/RoomListStore";
import { DefaultTagID } from "../../../stores/room-list/models";
import { tagRoom } from "../../../utils/room/tagRoom";
import { canInviteTo } from "../../../utils/room/canInviteTo";
import { inviteToRoom } from "../../../utils/room/inviteToRoom";
import { useAccountData } from "../../../hooks/useAccountData";
import { useRoomState } from "../../../hooks/useRoomState";
import { useTopic } from "../../../hooks/room/useTopic";
import { Linkify, topicToHtml } from "../../../HtmlUtils";
import { Box } from "../../utils/Box";
import { onRoomTopicLinkClick } from "../elements/RoomTopic";
import { useDispatcher } from "../../../hooks/useDispatcher";
import { Action } from "../../../dispatcher/actions";
import { Key } from "../../../Keyboard";
import { useTransition } from "../../../hooks/useTransition";
import { useIsVideoRoom } from "../../../utils/video-rooms";

interface IProps {
    room: Room;
    permalinkCreator: RoomPermalinkCreator;
    onSearchChange?: (e: ChangeEvent) => void;
    onSearchCancel?: () => void;
    focusRoomSearch?: boolean;
}

interface IAppsSectionProps {
    room: Room;
}

export const useWidgets = (room: Room): IApp[] => {
    const [apps, setApps] = useState<IApp[]>(() => WidgetStore.instance.getApps(room.roomId));

    const updateApps = useCallback(() => {
        // Copy the array so that we always trigger a re-render, as some updates mutate the array of apps/settings
        setApps([...WidgetStore.instance.getApps(room.roomId)]);
    }, [room]);

    useEffect(updateApps, [room, updateApps]);
    useEventEmitter(WidgetStore.instance, room.roomId, updateApps);
    useEventEmitter(WidgetLayoutStore.instance, WidgetLayoutStore.emissionForRoom(room), updateApps);

    return apps;
};

interface IAppRowProps {
    app: IApp;
    room: Room;
}

const AppRow: React.FC<IAppRowProps> = ({ app, room }) => {
    const name = WidgetUtils.getWidgetName(app);
    const dataTitle = WidgetUtils.getWidgetDataTitle(app);
    const subtitle = dataTitle && " - " + dataTitle;
    const [canModifyWidget, setCanModifyWidget] = useState<boolean>();

    useEffect(() => {
        setCanModifyWidget(WidgetUtils.canUserModifyWidgets(room.client, room.roomId));
    }, [room.client, room.roomId]);

    const onOpenWidgetClick = (): void => {
        RightPanelStore.instance.pushCard({
            phase: RightPanelPhases.Widget,
            state: { widgetId: app.id },
        });
    };

    const isPinned = WidgetLayoutStore.instance.isInContainer(room, app, Container.Top);
    const togglePin = isPinned
        ? () => {
              WidgetLayoutStore.instance.moveToContainer(room, app, Container.Right);
          }
        : () => {
              WidgetLayoutStore.instance.moveToContainer(room, app, Container.Top);
          };

    const [menuDisplayed, handle, openMenu, closeMenu] = useContextMenu<HTMLDivElement>();
    let contextMenu;
    if (menuDisplayed) {
        const rect = handle.current?.getBoundingClientRect();
        const rightMargin = rect?.right ?? 0;
        const topMargin = rect?.top ?? 0;
        contextMenu = (
            <WidgetContextMenu
                chevronFace={ChevronFace.None}
                right={UIStore.instance.windowWidth - rightMargin}
                bottom={UIStore.instance.windowHeight - topMargin}
                onFinished={closeMenu}
                app={app}
            />
        );
    }

    const cannotPin = !isPinned && !WidgetLayoutStore.instance.canAddToContainer(room, Container.Top);

    let pinTitle: string;
    if (cannotPin) {
        pinTitle = _t("right_panel|pinned_messages|limits", { count: MAX_PINNED });
    } else {
        pinTitle = isPinned ? _t("action|unpin") : _t("action|pin");
    }

    const isMaximised = WidgetLayoutStore.instance.isInContainer(room, app, Container.Center);
    const toggleMaximised = isMaximised
        ? () => {
              WidgetLayoutStore.instance.moveToContainer(room, app, Container.Right);
          }
        : () => {
              WidgetLayoutStore.instance.moveToContainer(room, app, Container.Center);
          };

    const maximiseTitle = isMaximised ? _t("action|close") : _t("action|maximise");

    let openTitle = "";
    if (isPinned) {
        openTitle = _t("widget|unpin_to_view_right_panel");
    } else if (isMaximised) {
        openTitle = _t("widget|close_to_view_right_panel");
    }

    const classes = classNames("mx_BaseCard_Button mx_RoomSummaryCard_Button", {
        mx_RoomSummaryCard_Button_pinned: isPinned,
        mx_RoomSummaryCard_Button_maximised: isMaximised,
    });

    return (
        <div className={classes} ref={handle}>
            <AccessibleButton
                className="mx_RoomSummaryCard_icon_app"
                onClick={onOpenWidgetClick}
                // only show a tooltip if the widget is pinned
                title={!(isPinned || isMaximised) ? undefined : openTitle}
                disabled={isPinned || isMaximised}
            >
                <WidgetAvatar app={app} size="20px" />
                <span>{name}</span>
                {subtitle}
            </AccessibleButton>

            {canModifyWidget && (
                <ContextMenuTooltipButton
                    className="mx_RoomSummaryCard_app_options"
                    isExpanded={menuDisplayed}
                    onClick={openMenu}
                    title={_t("common|options")}
                />
            )}

            <AccessibleButton
                className="mx_RoomSummaryCard_app_pinToggle"
                onClick={togglePin}
                title={pinTitle}
                disabled={cannotPin}
            />
            <AccessibleButton
                className="mx_RoomSummaryCard_app_maximiseToggle"
                onClick={toggleMaximised}
                title={maximiseTitle}
            />

            {contextMenu}
        </div>
    );
};

const AppsSection: React.FC<IAppsSectionProps> = ({ room }) => {
    const apps = useWidgets(room);
    // Filter out virtual widgets
    const realApps = useMemo(() => apps.filter((app) => app.eventId !== undefined), [apps]);

    const onManageIntegrations = (): void => {
        const managers = IntegrationManagers.sharedInstance();
        if (!managers.hasManager()) {
            managers.openNoManagerDialog();
        } else {
            // noinspection JSIgnoredPromiseFromCall
            managers.getPrimaryManager()?.open(room);
        }
    };

    let copyLayoutBtn: JSX.Element | null = null;
    if (realApps.length > 0 && WidgetLayoutStore.instance.canCopyLayoutToRoom(room)) {
        copyLayoutBtn = (
            <AccessibleButton kind="link" onClick={() => WidgetLayoutStore.instance.copyLayoutToRoom(room)}>
                {_t("widget|set_room_layout")}
            </AccessibleButton>
        );
    }

    return (
        <Group className="mx_RoomSummaryCard_appsGroup" title={_t("right_panel|widgets_section")}>
            {realApps.map((app) => (
                <AppRow key={app.id} app={app} room={room} />
            ))}
            {copyLayoutBtn}
            <AccessibleButton kind="link" onClick={onManageIntegrations}>
                {realApps.length > 0 ? _t("right_panel|edit_integrations") : _t("right_panel|add_integrations")}
            </AccessibleButton>
        </Group>
    );
};

const onRoomFilesClick = (): void => {
    RightPanelStore.instance.pushCard({ phase: RightPanelPhases.FilePanel }, true);
};

const onRoomPinsClick = (): void => {
    RightPanelStore.instance.pushCard({ phase: RightPanelPhases.PinnedMessages }, true);
};

const onRoomSettingsClick = (ev: Event): void => {
    defaultDispatcher.dispatch({ action: "open_room_settings" });
    PosthogTrackers.trackInteraction("WebRightPanelRoomInfoSettingsButton", ev);
};

const RoomTopic: React.FC<Pick<IProps, "room">> = ({ room }): JSX.Element | null => {
    const [expanded, setExpanded] = useState(false);

    const topic = useTopic(room);
    const body = topicToHtml(topic?.text, topic?.html);

    const onEditClick = (e: SyntheticEvent): void => {
        e.preventDefault();
        e.stopPropagation();
        defaultDispatcher.dispatch({ action: "open_room_settings" });
    };

    if (!body) {
        return (
            <Flex
                as="section"
                direction="column"
                justify="center"
                gap="var(--cpd-space-2x)"
                className="mx_RoomSummaryCard_topic"
            >
                <Box flex="1">
                    <Link kind="primary" onClick={onEditClick}>
                        <Text size="sm" weight="regular">
                            {_t("right_panel|add_topic")}
                        </Text>
                    </Link>
                </Box>
            </Flex>
        );
    }

    const content = expanded ? <Linkify>{body}</Linkify> : body;
    return (
        <Flex
            as="section"
            direction="column"
            justify="center"
            gap="var(--cpd-space-2x)"
            className={classNames("mx_RoomSummaryCard_topic", {
                mx_RoomSummaryCard_topic_collapsed: !expanded,
            })}
        >
            <Box flex="1" className="mx_RoomSummaryCard_topic_container">
                <Text
                    size="sm"
                    weight="regular"
                    onClick={(ev: React.MouseEvent): void => {
                        if (ev.target instanceof HTMLAnchorElement) {
                            onRoomTopicLinkClick(ev);
                            return;
                        }
                        setExpanded(!expanded);
                    }}
                >
                    {content}
                </Text>
                <IconButton
                    className="mx_RoomSummaryCard_topic_chevron"
                    size="24px"
                    onClick={() => setExpanded(!expanded)}
                >
                    <ChevronDownIcon />
                </IconButton>
            </Box>
            {expanded && (
                <Box flex="1" className="mx_RoomSummaryCard_topic_edit">
                    <Link kind="primary" onClick={onEditClick}>
                        <Text size="sm" weight="regular">
                            {_t("action|edit")}
                        </Text>
                    </Link>
                </Box>
            )}
        </Flex>
    );
};

const RoomSummaryCard: React.FC<IProps> = ({
    room,
    permalinkCreator,
    onSearchChange,
    onSearchCancel,
    focusRoomSearch,
}) => {
    const cli = useContext(MatrixClientContext);

    const onShareRoomClick = (): void => {
        Modal.createDialog(ShareDialog, {
            target: room,
        });
    };

    const onRoomExportClick = async (): Promise<void> => {
        Modal.createDialog(ExportDialog, {
            room,
        });
    };

    const onRoomPollHistoryClick = (): void => {
        Modal.createDialog(PollHistoryDialog, {
            room,
            matrixClient: cli,
            permalinkCreator,
        });
    };

    const onLeaveRoomClick = (): void => {
        defaultDispatcher.dispatch({
            action: "leave_room",
            room_id: room.roomId,
        });
    };

    const isRoomEncrypted = useIsEncrypted(cli, room);
    const roomContext = useContext(RoomContext);
    const e2eStatus = roomContext.e2eStatus;
    const isVideoRoom = useIsVideoRoom(room);

    const roomState = useRoomState(room);
    const directRoomsList = useAccountData<Record<string, string[]>>(room.client, EventType.Direct);
    const [isDirectMessage, setDirectMessage] = useState(false);
    useEffect(() => {
        for (const [, dmRoomList] of Object.entries(directRoomsList)) {
            if (dmRoomList.includes(room?.roomId ?? "")) {
                setDirectMessage(true);
                break;
            }
        }
    }, [room, directRoomsList]);

    const searchInputRef = useRef<HTMLInputElement>(null);
    useDispatcher(defaultDispatcher, (payload) => {
        if (payload.action === Action.FocusMessageSearch) {
            searchInputRef.current?.focus();
        }
    });
    // Clear the search field when the user leaves the search view
    useTransition(
        (prevTimelineRenderingType) => {
            if (
                prevTimelineRenderingType === TimelineRenderingType.Search &&
                roomContext.timelineRenderingType !== TimelineRenderingType.Search &&
                searchInputRef.current
            ) {
                searchInputRef.current.value = "";
            }
        },
        [roomContext.timelineRenderingType],
    );

    const alias = room.getCanonicalAlias() || room.getAltAliases()[0] || "";
    const header = (
        <header className="mx_RoomSummaryCard_container">
            <RoomAvatar room={room} size="80px" viewAvatarOnClick />
            <RoomName room={room}>
                {(name) => (
                    <Heading
                        as="h1"
                        size="md"
                        weight="semibold"
                        className="mx_RoomSummaryCard_roomName text-primary"
                        title={name}
                    >
                        {name}
                    </Heading>
                )}
            </RoomName>
            <Text
                as="div"
                size="sm"
                weight="semibold"
                className="mx_RoomSummaryCard_alias text-secondary"
                title={alias}
            >
                {alias}
            </Text>

            <Flex as="section" justify="center" gap="var(--cpd-space-2x)" className="mx_RoomSummaryCard_badges">
                {!isDirectMessage && roomState.getJoinRule() === JoinRule.Public && (
                    <Badge kind="default">
                        <PublicIcon width="1em" />
                        {_t("common|public_room")}
                    </Badge>
                )}

                {isRoomEncrypted && e2eStatus !== E2EStatus.Warning && (
                    <Badge kind="success">
                        <LockIcon width="1em" />
                        {_t("common|encrypted")}
                    </Badge>
                )}

                {!e2eStatus && (
                    <Badge kind="default">
                        <LockOffIcon width="1em" />
                        {_t("common|unencrypted")}
                    </Badge>
                )}

                {e2eStatus === E2EStatus.Warning && (
                    <Badge kind="critical">
                        <ErrorIcon width="1em" />
                        {_t("common|not_trusted")}
                    </Badge>
                )}
            </Flex>

            <RoomTopic room={room} />
        </header>
    );

    const pinningEnabled = useFeatureEnabled("feature_pinning");
    const pinCount = usePinnedEvents(pinningEnabled ? room : undefined)?.length;

    const roomTags = useEventEmitterState(RoomListStore.instance, LISTS_UPDATE_EVENT, () =>
        RoomListStore.instance.getTagsForRoom(room),
    );
    const canInviteToState = useEventEmitterState(room, RoomStateEvent.Update, () => canInviteTo(room));
    const isFavorite = roomTags.includes(DefaultTagID.Favourite);

    return (
        <BaseCard
            hideHeaderButtons
            id="room-summary-panel"
            className="mx_RoomSummaryCard"
            ariaLabelledBy="room-summary-panel-tab"
            role="tabpanel"
        >
            <Flex
                as="header"
                className="mx_RoomSummaryCard_header"
                gap="var(--cpd-space-3x)"
                align="center"
                justify="space-between"
            >
                {onSearchChange && (
                    <Form.Root className="mx_RoomSummaryCard_search" onSubmit={(e) => e.preventDefault()}>
                        <Search
                            placeholder={_t("room|search|placeholder")}
                            name="room_message_search"
                            onChange={onSearchChange}
                            className="mx_no_textinput"
                            ref={searchInputRef}
                            autoFocus={focusRoomSearch}
                            onKeyDown={(e) => {
                                if (searchInputRef.current && e.key === Key.ESCAPE) {
                                    searchInputRef.current.value = "";
                                    onSearchCancel?.();
                                }
                            }}
                        />
                    </Form.Root>
                )}
            </Flex>

            {header}

            <Separator />

            <div role="menubar" aria-orientation="vertical">
                <ToggleMenuItem
                    Icon={FavouriteIcon}
                    label={_t("room|context_menu|favourite")}
                    checked={isFavorite}
                    onChange={() => tagRoom(room, DefaultTagID.Favourite)}
                    // XXX: https://github.com/element-hq/compound/issues/288
                    onSelect={() => {}}
                />
                <MenuItem
                    Icon={UserAddIcon}
                    label={_t("action|invite")}
                    disabled={!canInviteToState}
                    onSelect={() => inviteToRoom(room)}
                />
                <MenuItem Icon={LinkIcon} label={_t("action|copy_link")} onSelect={onShareRoomClick} />
                <MenuItem Icon={SettingsIcon} label={_t("common|settings")} onSelect={onRoomSettingsClick} />

                <Separator />
                {!isVideoRoom && (
                    <>
                        <MenuItem Icon={FilesIcon} label={_t("right_panel|files_button")} onSelect={onRoomFilesClick} />
                        <MenuItem
                            Icon={PollsIcon}
                            label={_t("right_panel|polls_button")}
                            onSelect={onRoomPollHistoryClick}
                        />
                        {pinningEnabled && (
                            <MenuItem
                                Icon={PinIcon}
                                label={_t("right_panel|pinned_messages_button")}
                                onSelect={onRoomPinsClick}
                            >
                                <Text as="span" size="sm">
                                    {pinCount}
                                </Text>
                            </MenuItem>
                        )}
                        <MenuItem
                            Icon={ExportArchiveIcon}
                            label={_t("export_chat|title")}
                            onSelect={onRoomExportClick}
                        />
                    </>
                )}

                <Separator />

                <MenuItem
                    Icon={LeaveIcon}
                    kind="critical"
                    label={_t("action|leave_room")}
                    onSelect={onLeaveRoomClick}
                />
            </div>

            {SettingsStore.getValue(UIFeature.Widgets) &&
                !isVideoRoom &&
                shouldShowComponent(UIComponent.AddIntegrations) && <AppsSection room={room} />}
        </BaseCard>
    );
};

export default RoomSummaryCard;