/*
Copyright 2024 New Vector Ltd.
Copyright 2022 The Matrix.org Foundation C.I.C.

SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only
Please see LICENSE files in the repository root for full details.
*/

import { sleep } from "matrix-js-sdk/src/utils";
import React, { ReactNode } from "react";
import { EventStatus, MatrixEventEvent, Room, MatrixClient, MatrixError } from "matrix-js-sdk/src/matrix";

import Modal, { IHandle } from "../Modal";
import Spinner from "../components/views/elements/Spinner";
import { _t } from "../languageHandler";
import ErrorDialog from "../components/views/dialogs/ErrorDialog";
import { isMetaSpace } from "../stores/spaces";
import SpaceStore from "../stores/spaces/SpaceStore";
import dis from "../dispatcher/dispatcher";
import { ViewRoomPayload } from "../dispatcher/payloads/ViewRoomPayload";
import { Action } from "../dispatcher/actions";
import { ViewHomePagePayload } from "../dispatcher/payloads/ViewHomePagePayload";
import LeaveSpaceDialog from "../components/views/dialogs/LeaveSpaceDialog";
import { AfterLeaveRoomPayload } from "../dispatcher/payloads/AfterLeaveRoomPayload";
import { bulkSpaceBehaviour } from "./space";
import { SdkContextClass } from "../contexts/SDKContext";
import SettingsStore from "../settings/SettingsStore";

export async function leaveRoomBehaviour(
    matrixClient: MatrixClient,
    roomId: string,
    retry = true,
    spinner = true,
): Promise<void> {
    let spinnerModal: IHandle<any> | undefined;
    if (spinner) {
        spinnerModal = Modal.createDialog(Spinner, undefined, "mx_Dialog_spinner");
    }

    let leavingAllVersions = true;
    const history = matrixClient.getRoomUpgradeHistory(
        roomId,
        false,
        SettingsStore.getValue("feature_dynamic_room_predecessors"),
    );
    if (history && history.length > 0) {
        const currentRoom = history[history.length - 1];
        if (currentRoom.roomId !== roomId) {
            // The user is trying to leave an older version of the room. Let them through
            // without making them leave the current version of the room.
            leavingAllVersions = false;
        }
    }

    const room = matrixClient.getRoom(roomId);

    // should not encounter this
    if (!room) {
        throw new Error(`Expected to find room for id ${roomId}`);
    }

    // await any queued messages being sent so that they do not fail
    await Promise.all(
        room
            .getPendingEvents()
            .filter((ev) => {
                return [EventStatus.QUEUED, EventStatus.ENCRYPTING, EventStatus.SENDING].includes(ev.status!);
            })
            .map(
                (ev) =>
                    new Promise<void>((resolve, reject) => {
                        const handler = (): void => {
                            if (ev.status === EventStatus.NOT_SENT) {
                                spinnerModal?.close();
                                reject(ev.error);
                            }

                            if (!ev.status || ev.status === EventStatus.SENT) {
                                ev.off(MatrixEventEvent.Status, handler);
                                resolve();
                            }
                        };

                        ev.on(MatrixEventEvent.Status, handler);
                    }),
            ),
    );

    let results: { [roomId: string]: Error | MatrixError | null } = {};
    if (!leavingAllVersions) {
        try {
            await matrixClient.leave(roomId);
        } catch (e) {
            if (e instanceof MatrixError) {
                const message = e.data.error || _t("room|leave_unexpected_error");
                results[roomId] = Object.assign(new Error(message), { errcode: e.data.errcode, data: e.data });
            } else if (e instanceof Error) {
                results[roomId] = e;
            } else {
                results[roomId] = new Error("Failed to leave room for unknown causes");
            }
        }
    } else {
        results = await matrixClient.leaveRoomChain(roomId, retry);
    }

    if (retry) {
        const limitExceededError = Object.values(results).find(
            (e) => (e as MatrixError)?.errcode === "M_LIMIT_EXCEEDED",
        ) as MatrixError;
        if (limitExceededError) {
            await sleep(limitExceededError.data.retry_after_ms ?? 100);
            return leaveRoomBehaviour(matrixClient, roomId, false, false);
        }
    }

    spinnerModal?.close();

    const errors = Object.entries(results).filter((r) => !!r[1]);
    if (errors.length > 0) {
        const messages: ReactNode[] = [];
        for (const roomErr of errors) {
            const err = roomErr[1] as MatrixError; // [0] is the roomId
            let message = _t("room|leave_unexpected_error");
            if (err?.errcode && err.message) {
                if (err.errcode === "M_CANNOT_LEAVE_SERVER_NOTICE_ROOM") {
                    Modal.createDialog(ErrorDialog, {
                        title: _t("room|leave_server_notices_title"),
                        description: _t("room|leave_server_notices_description"),
                    });
                    return;
                }
                message = results[roomId]!.message;
            }
            messages.push(message, React.createElement("BR")); // createElement to avoid using a tsx file in utils
        }
        Modal.createDialog(ErrorDialog, {
            title: _t("room|leave_error_title"),
            description: messages,
        });
        return;
    }

    if (SdkContextClass.instance.roomViewStore.getRoomId() === roomId) {
        // We were viewing the room that was just left. In order to avoid
        // accidentally viewing the next room in the list and clearing its
        // notifications, switch to a neutral ground such as the home page or
        // space landing page.
        if (isMetaSpace(SpaceStore.instance.activeSpace)) {
            dis.dispatch<ViewHomePagePayload>({ action: Action.ViewHomePage });
        } else if (SpaceStore.instance.activeSpace === roomId) {
            // View the parent space, if there is one
            const parent = SpaceStore.instance.getCanonicalParent(roomId);
            if (parent !== null) {
                dis.dispatch<ViewRoomPayload>({
                    action: Action.ViewRoom,
                    room_id: parent.roomId,
                    metricsTrigger: undefined, // other
                });
            } else {
                dis.dispatch<ViewHomePagePayload>({ action: Action.ViewHomePage });
            }
        } else {
            dis.dispatch<ViewRoomPayload>({
                action: Action.ViewRoom,
                room_id: SpaceStore.instance.activeSpace,
                metricsTrigger: undefined, // other
            });
        }
    }
}

export const leaveSpace = (space: Room): void => {
    Modal.createDialog(
        LeaveSpaceDialog,
        {
            space,
            onFinished: async (leave: boolean, rooms: Room[]): Promise<void> => {
                if (!leave) return;
                await bulkSpaceBehaviour(space, rooms, (room) => leaveRoomBehaviour(space.client, room.roomId));

                dis.dispatch<AfterLeaveRoomPayload>({
                    action: Action.AfterLeaveRoom,
                    room_id: space.roomId,
                });
            },
        },
        "mx_LeaveSpaceDialog_wrapper",
    );
};