/*
Copyright 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, { FC } from "react";
import { Room, JoinRule, MatrixClient } from "matrix-js-sdk/src/matrix";

import { _t } from "../../../languageHandler";
import RightPanelStore from "../../../stores/right-panel/RightPanelStore";
import { RightPanelPhases } from "../../../stores/right-panel/RightPanelStorePhases";
import { useAsyncMemo } from "../../../hooks/useAsyncMemo";
import { useRoomState } from "../../../hooks/useRoomState";
import { useFeatureEnabled } from "../../../hooks/useSettings";
import { useRoomMemberCount, useMyRoomMembership } from "../../../hooks/useRoomMembers";
import AccessibleButton from "../elements/AccessibleButton";

interface IProps {
    room: Room;
}

const RoomInfoLine: FC<IProps> = ({ room }) => {
    // summary will begin as undefined whilst loading and go null if it fails to load or we are not invited.
    const summary = useAsyncMemo(async (): Promise<Awaited<ReturnType<MatrixClient["getRoomSummary"]>> | null> => {
        if (room.getMyMembership() !== "invite") return null;
        try {
            return await room.client.getRoomSummary(room.roomId);
        } catch (e) {
            return null;
        }
    }, [room]);
    const joinRule = useRoomState(room, (state) => state.getJoinRule());
    const membership = useMyRoomMembership(room);
    const memberCount = useRoomMemberCount(room);

    const elementCallVideoRoomsEnabled = useFeatureEnabled("feature_element_call_video_rooms");
    const isVideoRoom = room.isElementVideoRoom() || (elementCallVideoRoomsEnabled && room.isCallRoom());

    let iconClass: string;
    let roomType: string;
    if (isVideoRoom) {
        iconClass = "mx_RoomInfoLine_video";
        roomType = _t("common|video_room");
    } else if (joinRule === JoinRule.Public) {
        iconClass = "mx_RoomInfoLine_public";
        roomType = room.isSpaceRoom() ? _t("common|public_space") : _t("common|public_room");
    } else {
        iconClass = "mx_RoomInfoLine_private";
        roomType = room.isSpaceRoom() ? _t("common|private_space") : _t("common|private_room");
    }

    let members: JSX.Element | undefined;
    if (membership === "invite" && summary) {
        // Don't trust local state and instead use the summary API
        members = (
            <span className="mx_RoomInfoLine_members">
                {_t("common|n_members", { count: summary.num_joined_members })}
            </span>
        );
    } else if (memberCount && summary !== undefined) {
        // summary is not still loading
        const viewMembers = (): void =>
            RightPanelStore.instance.setCard({
                phase: room.isSpaceRoom() ? RightPanelPhases.SpaceMemberList : RightPanelPhases.RoomMemberList,
            });

        members = (
            <AccessibleButton kind="link" className="mx_RoomInfoLine_members" onClick={viewMembers}>
                {_t("common|n_members", { count: memberCount })}
            </AccessibleButton>
        );
    }

    return (
        <div className={`mx_RoomInfoLine ${iconClass}`}>
            {roomType}
            {members}
        </div>
    );
};

export default RoomInfoLine;
