/*
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, { useState } from "react";
import { Room, EventType, MatrixClient } from "matrix-js-sdk/src/matrix";
import { logger } from "matrix-js-sdk/src/logger";

import { _t } from "../../../languageHandler";
import AccessibleButton from "../elements/AccessibleButton";
import SpaceBasicSettings from "./SpaceBasicSettings";
import { avatarUrlForRoom } from "../../../Avatar";
import { htmlSerializeFromMdIfNeeded } from "../../../editor/serialize";
import { leaveSpace } from "../../../utils/leave-behaviour";
import { getTopic } from "../../../hooks/room/useTopic";
import SettingsTab from "../settings/tabs/SettingsTab";
import { SettingsSection } from "../settings/shared/SettingsSection";
import SettingsSubsection from "../settings/shared/SettingsSubsection";

interface IProps {
    matrixClient: MatrixClient;
    space: Room;
}

const SpaceSettingsGeneralTab: React.FC<IProps> = ({ matrixClient: cli, space }) => {
    const [busy, setBusy] = useState(false);
    const [error, setError] = useState("");

    const userId = cli.getUserId()!;

    const [newAvatar, setNewAvatar] = useState<File | null | undefined>(null); // undefined means to remove avatar
    const canSetAvatar = space.currentState.maySendStateEvent(EventType.RoomAvatar, userId);
    const avatarChanged = newAvatar !== null;

    const [name, setName] = useState<string>(space.name);
    const canSetName = space.currentState.maySendStateEvent(EventType.RoomName, userId);
    const nameChanged = name !== space.name;

    const currentTopic = getTopic(space)?.text ?? "";
    const [topic, setTopic] = useState(currentTopic);
    const canSetTopic = space.currentState.maySendStateEvent(EventType.RoomTopic, userId);
    const topicChanged = topic !== currentTopic;

    const onCancel = (): void => {
        setNewAvatar(null);
        setName(space.name);
        setTopic(currentTopic);
    };

    const onSave = async (): Promise<void> => {
        setBusy(true);
        const promises: Promise<unknown>[] = [];

        if (avatarChanged) {
            if (newAvatar) {
                promises.push(
                    (async (): Promise<void> => {
                        const { content_uri: url } = await cli.uploadContent(newAvatar);
                        await cli.sendStateEvent(space.roomId, EventType.RoomAvatar, { url }, "");
                    })(),
                );
            } else {
                promises.push(cli.sendStateEvent(space.roomId, EventType.RoomAvatar, {}, ""));
            }
        }

        if (nameChanged) {
            promises.push(cli.setRoomName(space.roomId, name));
        }

        if (topicChanged) {
            const htmlTopic = htmlSerializeFromMdIfNeeded(topic, { forceHTML: false });
            promises.push(cli.setRoomTopic(space.roomId, topic, htmlTopic));
        }

        const results = await Promise.allSettled(promises);
        setBusy(false);
        const failures = results.filter((r) => r.status === "rejected");
        if (failures.length > 0) {
            logger.error("Failed to save space settings: ", failures);
            setError(_t("room_settings|general|error_save_space_settings"));
        }
    };

    return (
        <SettingsTab>
            <SettingsSection heading={_t("common|general")}>
                <div>
                    <div>{_t("room_settings|general|description_space")}</div>

                    {error && <div className="mx_SpaceRoomView_errorText">{error}</div>}

                    <SpaceBasicSettings
                        avatarUrl={avatarUrlForRoom(space, 80, 80, "crop") ?? undefined}
                        avatarDisabled={busy || !canSetAvatar}
                        setAvatar={setNewAvatar}
                        name={name}
                        nameDisabled={busy || !canSetName}
                        setName={setName}
                        topic={topic}
                        topicDisabled={busy || !canSetTopic}
                        setTopic={setTopic}
                    />

                    <AccessibleButton
                        onClick={onCancel}
                        disabled={busy || !(avatarChanged || nameChanged || topicChanged)}
                        kind="link"
                    >
                        {_t("action|cancel")}
                    </AccessibleButton>
                    <AccessibleButton onClick={onSave} disabled={busy} kind="primary">
                        {busy ? _t("common|saving") : _t("room_settings|general|save")}
                    </AccessibleButton>
                </div>

                <SettingsSubsection heading={_t("room_settings|general|leave_space")}>
                    <AccessibleButton
                        kind="danger"
                        onClick={() => {
                            leaveSpace(space);
                        }}
                    >
                        {_t("room_settings|general|leave_space")}
                    </AccessibleButton>
                </SettingsSubsection>
            </SettingsSection>
        </SettingsTab>
    );
};

export default SpaceSettingsGeneralTab;
