/*
Copyright 2023 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, { useEffect, useMemo, useState } from "react";
import { Body as BodyText, IconButton, Tooltip } from "@vector-im/compound-web";
import { Icon as VideoCallIcon } from "@vector-im/compound-design-tokens/icons/video-call-solid.svg";
import { Icon as VoiceCallIcon } from "@vector-im/compound-design-tokens/icons/voice-call.svg";
import { Icon as ThreadsIcon } from "@vector-im/compound-design-tokens/icons/threads-solid.svg";
import { Icon as NotificationsIcon } from "@vector-im/compound-design-tokens/icons/notifications-solid.svg";
import { Icon as VerifiedIcon } from "@vector-im/compound-design-tokens/icons/verified.svg";
import { Icon as ErrorIcon } from "@vector-im/compound-design-tokens/icons/error.svg";
import { Icon as PublicIcon } from "@vector-im/compound-design-tokens/icons/public.svg";
import { EventType, JoinRule, type Room } from "matrix-js-sdk/src/matrix";
import { ViewRoomOpts } from "@matrix-org/react-sdk-module-api/lib/lifecycles/RoomViewLifecycle";

import { useRoomName } from "../../../hooks/useRoomName";
import { RightPanelPhases } from "../../../stores/right-panel/RightPanelStorePhases";
import { useTopic } from "../../../hooks/room/useTopic";
import { useAccountData } from "../../../hooks/useAccountData";
import { useMatrixClientContext } from "../../../contexts/MatrixClientContext";
import { useRoomMemberCount, useRoomMembers } from "../../../hooks/useRoomMembers";
import { _t } from "../../../languageHandler";
import { Flex } from "../../utils/Flex";
import { Box } from "../../utils/Box";
import { useRoomCall } from "../../../hooks/room/useRoomCall";
import { useRoomThreadNotifications } from "../../../hooks/room/useRoomThreadNotifications";
import { NotificationColor } from "../../../stores/notifications/NotificationColor";
import { useGlobalNotificationState } from "../../../hooks/useGlobalNotificationState";
import SdkConfig from "../../../SdkConfig";
import { useFeatureEnabled } from "../../../hooks/useSettings";
import { useEncryptionStatus } from "../../../hooks/useEncryptionStatus";
import { E2EStatus } from "../../../utils/ShieldUtils";
import FacePile from "../elements/FacePile";
import { useRoomState } from "../../../hooks/useRoomState";
import RoomAvatar from "../avatars/RoomAvatar";
import { formatCount } from "../../../utils/FormattingUtils";
import RightPanelStore from "../../../stores/right-panel/RightPanelStore";
import { Linkify, topicToHtml } from "../../../HtmlUtils";
import PosthogTrackers from "../../../PosthogTrackers";
import { VideoRoomChatButton } from "./RoomHeader/VideoRoomChatButton";

/**
 * A helper to transform a notification color to the what the Compound Icon Button
 * expects
 */
function notificationColorToIndicator(color: NotificationColor): React.ComponentProps<typeof IconButton>["indicator"] {
    if (color <= NotificationColor.None) {
        return undefined;
    } else if (color <= NotificationColor.Grey) {
        return "default";
    } else {
        return "highlight";
    }
}

export default function RoomHeader({
    room,
    additionalButtons,
}: {
    room: Room;
    additionalButtons?: ViewRoomOpts["buttons"];
}): JSX.Element {
    const client = useMatrixClientContext();

    const roomName = useRoomName(room);
    const roomTopic = useTopic(room);
    const roomState = useRoomState(room);

    const members = useRoomMembers(room, 2500);
    const memberCount = useRoomMemberCount(room, { throttleWait: 2500 });

    const { voiceCallDisabledReason, voiceCallClick, videoCallDisabledReason, videoCallClick } = useRoomCall(room);

    const groupCallsEnabled = useFeatureEnabled("feature_group_calls");
    /**
     * A special mode where only Element Call is used. In this case we want to
     * hide the voice call button
     */
    const useElementCallExclusively = useMemo(() => {
        return SdkConfig.get("element_call").use_exclusively && groupCallsEnabled;
    }, [groupCallsEnabled]);

    const threadNotifications = useRoomThreadNotifications(room);
    const globalNotificationState = useGlobalNotificationState();

    const directRoomsList = useAccountData<Record<string, string[]>>(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 e2eStatus = useEncryptionStatus(client, room);

    const notificationsEnabled = useFeatureEnabled("feature_notifications");

    const roomTopicBody = useMemo(
        () => topicToHtml(roomTopic?.text, roomTopic?.html),
        [roomTopic?.html, roomTopic?.text],
    );

    return (
        <Flex
            as="header"
            align="center"
            gap="var(--cpd-space-3x)"
            className="mx_RoomHeader light-panel"
            onClick={() => {
                RightPanelStore.instance.showOrHidePanel(RightPanelPhases.RoomSummary);
            }}
        >
            <RoomAvatar room={room} size="40px" />
            <Box flex="1" className="mx_RoomHeader_info">
                <BodyText
                    as="div"
                    size="lg"
                    weight="semibold"
                    dir="auto"
                    role="heading"
                    aria-level={1}
                    className="mx_RoomHeader_heading"
                >
                    <span className="mx_RoomHeader_truncated mx_lineClamp">{roomName}</span>

                    {!isDirectMessage && roomState.getJoinRule() === JoinRule.Public && (
                        <Tooltip label={_t("common|public_room")} side="right">
                            <PublicIcon
                                width="16px"
                                height="16px"
                                className="mx_RoomHeader_icon text-secondary"
                                aria-label={_t("common|public_room")}
                            />
                        </Tooltip>
                    )}

                    {isDirectMessage && e2eStatus === E2EStatus.Verified && (
                        <Tooltip label={_t("common|verified")} side="right">
                            <VerifiedIcon
                                width="16px"
                                height="16px"
                                className="mx_RoomHeader_icon mx_Verified"
                                aria-label={_t("common|verified")}
                            />
                        </Tooltip>
                    )}

                    {isDirectMessage && e2eStatus === E2EStatus.Warning && (
                        <Tooltip label={_t("room|header_untrusted_label")} side="right">
                            <ErrorIcon
                                width="16px"
                                height="16px"
                                className="mx_RoomHeader_icon mx_Untrusted"
                                aria-label={_t("room|header_untrusted_label")}
                            />
                        </Tooltip>
                    )}
                </BodyText>
                {roomTopic && (
                    <BodyText as="div" size="sm" className="mx_RoomHeader_topic mx_RoomHeader_truncated mx_lineClamp">
                        <Linkify>{roomTopicBody}</Linkify>
                    </BodyText>
                )}
            </Box>
            <Flex as="nav" align="center" gap="var(--cpd-space-2x)">
                {additionalButtons?.map((props) => {
                    const label = props.label();

                    return (
                        <Tooltip label={label} key={props.id}>
                            <IconButton
                                aria-label={label}
                                onClick={(event) => {
                                    event.stopPropagation();
                                    props.onClick();
                                }}
                            >
                                {typeof props.icon === "function" ? props.icon() : props.icon}
                            </IconButton>
                        </Tooltip>
                    );
                })}
                <Tooltip label={!videoCallDisabledReason ? _t("voip|video_call") : videoCallDisabledReason!}>
                    <IconButton
                        disabled={!!videoCallDisabledReason}
                        aria-label={!videoCallDisabledReason ? _t("voip|video_call") : videoCallDisabledReason!}
                        onClick={videoCallClick}
                    >
                        <VideoCallIcon />
                    </IconButton>
                </Tooltip>
                {!useElementCallExclusively && (
                    <Tooltip label={!voiceCallDisabledReason ? _t("voip|voice_call") : voiceCallDisabledReason!}>
                        <IconButton
                            disabled={!!voiceCallDisabledReason}
                            aria-label={!voiceCallDisabledReason ? _t("voip|voice_call") : voiceCallDisabledReason!}
                            onClick={voiceCallClick}
                        >
                            <VoiceCallIcon />
                        </IconButton>
                    </Tooltip>
                )}

                {/* Renders nothing when room is not a video room */}
                <VideoRoomChatButton room={room} />

                <Tooltip label={_t("common|threads")}>
                    <IconButton
                        indicator={notificationColorToIndicator(threadNotifications)}
                        onClick={(evt) => {
                            evt.stopPropagation();
                            RightPanelStore.instance.showOrHidePanel(RightPanelPhases.ThreadPanel);
                            PosthogTrackers.trackInteraction("WebRoomHeaderButtonsThreadsButton", evt);
                        }}
                        aria-label={_t("common|threads")}
                    >
                        <ThreadsIcon />
                    </IconButton>
                </Tooltip>
                {notificationsEnabled && (
                    <Tooltip label={_t("notifications|enable_prompt_toast_title")}>
                        <IconButton
                            indicator={notificationColorToIndicator(globalNotificationState.color)}
                            onClick={(evt) => {
                                evt.stopPropagation();
                                RightPanelStore.instance.showOrHidePanel(RightPanelPhases.NotificationPanel);
                            }}
                            aria-label={_t("notifications|enable_prompt_toast_title")}
                        >
                            <NotificationsIcon />
                        </IconButton>
                    </Tooltip>
                )}
            </Flex>
            {!isDirectMessage && (
                <BodyText
                    as="div"
                    size="sm"
                    weight="medium"
                    aria-label={_t("common|n_members", { count: memberCount })}
                    onClick={(e: React.MouseEvent) => {
                        RightPanelStore.instance.showOrHidePanel(RightPanelPhases.RoomMemberList);
                        e.stopPropagation();
                    }}
                >
                    <FacePile
                        className="mx_RoomHeader_members"
                        members={members.slice(0, 3)}
                        size="20px"
                        overflow={false}
                        viewUserOnClick={false}
                    >
                        {formatCount(memberCount)}
                    </FacePile>
                </BodyText>
            )}
        </Flex>
    );
}
