ThreadNet-Web/src/components/views/dialogs/LeaveSpaceDialog.tsx

/*
Copyright 2021 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, { useMemo, useState } from "react";
import { Room } from "matrix-js-sdk/src/models/room";
import { JoinRule } from "matrix-js-sdk/src/@types/partials";

import { _t } from '../../../languageHandler';
import DialogButtons from "../elements/DialogButtons";
import BaseDialog from "../dialogs/BaseDialog";
import SpaceStore from "../../../stores/SpaceStore";
import SpaceChildrenPicker from "../spaces/SpaceChildrenPicker";

interface IProps {
    space: Room;
    onFinished(leave: boolean, rooms?: Room[]): void;
}

const isOnlyAdmin = (room: Room): boolean => {
    return !room.getJoinedMembers().some(member => {
        return member.userId !== room.client.credentials.userId && member.powerLevelNorm === 100;
    });
};

const LeaveSpaceDialog: React.FC<IProps> = ({ space, onFinished }) => {
    const spaceChildren = useMemo(() => SpaceStore.instance.getChildren(space.roomId), [space.roomId]);
    const [roomsToLeave, setRoomsToLeave] = useState<Room[]>([]);
    const selectedRooms = useMemo(() => new Set(roomsToLeave), [roomsToLeave]);

    let rejoinWarning;
    if (space.getJoinRule() !== JoinRule.Public) {
        rejoinWarning = _t("You won't be able to rejoin unless you are re-invited.");
    }

    let onlyAdminWarning;
    if (isOnlyAdmin(space)) {
        onlyAdminWarning = _t("You're the only admin of this space. " +
            "Leaving it will mean no one has control over it.");
    } else {
        const numChildrenOnlyAdminIn = roomsToLeave.filter(isOnlyAdmin).length;
        if (numChildrenOnlyAdminIn > 0) {
            onlyAdminWarning = _t("You're the only admin of some of the rooms or spaces you wish to leave. " +
                "Leaving them will leave them without any admins.");
        }
    }

    return <BaseDialog
        title={_t("Leave %(spaceName)s", { spaceName: space.name })}
        className="mx_LeaveSpaceDialog"
        contentId="mx_LeaveSpaceDialog"
        onFinished={() => onFinished(false)}
        fixedWidth={false}
    >
        <div className="mx_Dialog_content" id="mx_LeaveSpaceDialog">
            <p>
                { _t("Are you sure you want to leave <spaceName/>?", {}, {
                    spaceName: () => <b>{ space.name }</b>,
                }) }
                &nbsp;
                { rejoinWarning }
            </p>

            { spaceChildren.length > 0 && (
                <SpaceChildrenPicker
                    space={space}
                    spaceChildren={spaceChildren}
                    selected={selectedRooms}
                    onChange={setRoomsToLeave}
                    noneLabel={_t("Don't leave any")}
                    allLabel={_t("Leave all rooms and spaces")}
                    specificLabel={_t("Leave specific rooms and spaces")}
                />
            ) }

            { onlyAdminWarning && <div className="mx_LeaveSpaceDialog_section_warning">
                { onlyAdminWarning }
            </div> }
        </div>
        <DialogButtons
            primaryButton={_t("Leave space")}
            onPrimaryButtonClick={() => onFinished(true, roomsToLeave)}
            hasCancel={true}
            onCancel={onFinished}
        />
    </BaseDialog>;
};

export default LeaveSpaceDialog;