/*
Copyright 2024 New Vector Ltd.
Copyright 2017-2020 The Matrix.org Foundation C.I.C.
Copyright 2019 Travis Ralston

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

import { useCallback, useEffect, useState } from "react";
import { base32 } from "rfc4648";
import { capitalize } from "lodash";
import { type IWidget, type IWidgetData } from "matrix-widget-api";
import { type Room, ClientEvent, type MatrixClient, RoomStateEvent, type MatrixEvent } from "matrix-js-sdk/src/matrix";
import { KnownMembership } from "matrix-js-sdk/src/types";
import { logger } from "matrix-js-sdk/src/logger";
import { CallType } from "matrix-js-sdk/src/webrtc/call";
import { LOWERCASE, secureRandomString, secureRandomStringFrom } from "matrix-js-sdk/src/randomstring";

import PlatformPeg from "../PlatformPeg";
import SdkConfig from "../SdkConfig";
import dis from "../dispatcher/dispatcher";
import WidgetEchoStore from "../stores/WidgetEchoStore";
import { IntegrationManagers } from "../integrations/IntegrationManagers";
import { WidgetType } from "../widgets/WidgetType";
import { Jitsi } from "../widgets/Jitsi";
import { objectClone } from "./objects";
import { _t } from "../languageHandler";
import WidgetStore, { type IApp, isAppWidget } from "../stores/WidgetStore";
import { parseUrl } from "./UrlUtils";
import { useEventEmitter } from "../hooks/useEventEmitter";
import { WidgetLayoutStore } from "../stores/widgets/WidgetLayoutStore";
import { type IWidgetEvent, type UserWidget } from "./WidgetUtils-types";

// How long we wait for the state event echo to come back from the server
// before waitFor[Room/User]Widget rejects its promise
const WIDGET_WAIT_TIME = 20000;

export type { IWidgetEvent, UserWidget };

export default class WidgetUtils {
    /**
     * Returns true if user is able to send state events to modify widgets in this room
     * (Does not apply to non-room-based / user widgets)
     * @param client The matrix client of the logged-in user
     * @param roomId -- The ID of the room to check
     * @returns Boolean -- true if the user can modify widgets in this room
     * @throws Error -- specifies the error reason
     */
    public static canUserModifyWidgets(client: MatrixClient, roomId?: string): boolean {
        if (!roomId) {
            logger.warn("No room ID specified");
            return false;
        }

        if (!client) {
            logger.warn("User must be be logged in");
            return false;
        }

        const room = client.getRoom(roomId);
        if (!room) {
            logger.warn(`Room ID ${roomId} is not recognised`);
            return false;
        }

        const me = client.getUserId();
        if (!me) {
            logger.warn("Failed to get user ID");
            return false;
        }

        if (room.getMyMembership() !== KnownMembership.Join) {
            logger.warn(`User ${me} is not in room ${roomId}`);
            return false;
        }

        // TODO: Enable support for m.widget event type (https://github.com/vector-im/element-web/issues/13111)
        return room.currentState.maySendStateEvent("im.vector.modular.widgets", me);
    }

    // TODO: Generify the name of this function. It's not just scalar.
    /**
     * Returns true if specified url is a scalar URL, typically https://scalar.vector.im/api
     * @param matrixClient The matrix client of the logged-in user
     * @param  {[type]}  testUrlString URL to check
     * @returns {Boolean} True if specified URL is a scalar URL
     */
    public static isScalarUrl(testUrlString?: string): boolean {
        if (!testUrlString) {
            logger.error("Scalar URL check failed. No URL specified");
            return false;
        }

        const testUrl = parseUrl(testUrlString);
        let scalarUrls = SdkConfig.get().integrations_widgets_urls;
        if (!scalarUrls || scalarUrls.length === 0) {
            const defaultManager = IntegrationManagers.sharedInstance().getPrimaryManager();
            if (defaultManager) {
                scalarUrls = [defaultManager.apiUrl];
            } else {
                scalarUrls = [];
            }
        }

        for (let i = 0; i < scalarUrls.length; i++) {
            const scalarUrl = parseUrl(scalarUrls[i]);
            if (testUrl && scalarUrl) {
                if (
                    testUrl.protocol === scalarUrl.protocol &&
                    testUrl.host === scalarUrl.host &&
                    scalarUrl.pathname &&
                    testUrl.pathname?.startsWith(scalarUrl.pathname)
                ) {
                    return true;
                }
            }
        }
        return false;
    }

    /**
     * Returns a promise that resolves when a widget with the given
     * ID has been added as a user widget (ie. the accountData event
     * arrives) or rejects after a timeout
     *
     * @param client The matrix client of the logged-in user
     * @param widgetId The ID of the widget to wait for
     * @param add True to wait for the widget to be added,
     *     false to wait for it to be deleted.
     * @returns {Promise} that resolves when the widget is in the
     *     requested state according to the `add` param
     */
    public static waitForUserWidget(client: MatrixClient, widgetId: string, add: boolean): Promise<void> {
        return new Promise((resolve, reject) => {
            // Tests an account data event, returning true if it's in the state
            // we're waiting for it to be in
            function eventInIntendedState(ev?: MatrixEvent): boolean {
                if (!ev) return false;
                if (add) {
                    return ev.getContent()[widgetId] !== undefined;
                } else {
                    return ev.getContent()[widgetId] === undefined;
                }
            }

            const startingAccountDataEvent = client.getAccountData("m.widgets");
            if (eventInIntendedState(startingAccountDataEvent)) {
                resolve();
                return;
            }

            function onAccountData(ev: MatrixEvent): void {
                const currentAccountDataEvent = client.getAccountData("m.widgets");
                if (eventInIntendedState(currentAccountDataEvent)) {
                    client.removeListener(ClientEvent.AccountData, onAccountData);
                    clearTimeout(timerId);
                    resolve();
                }
            }
            const timerId = window.setTimeout(() => {
                client.removeListener(ClientEvent.AccountData, onAccountData);
                reject(new Error("Timed out waiting for widget ID " + widgetId + " to appear"));
            }, WIDGET_WAIT_TIME);
            client.on(ClientEvent.AccountData, onAccountData);
        });
    }

    /**
     * Returns a promise that resolves when a widget with the given
     * ID has been added as a room widget in the given room (ie. the
     * room state event arrives) or rejects after a timeout
     *
     * @param client The matrix client of the logged-in user
     * @param {string} widgetId The ID of the widget to wait for
     * @param {string} roomId The ID of the room to wait for the widget in
     * @param {boolean} add True to wait for the widget to be added,
     *     false to wait for it to be deleted.
     * @returns {Promise} that resolves when the widget is in the
     *     requested state according to the `add` param
     */
    public static waitForRoomWidget(
        client: MatrixClient,
        widgetId: string,
        roomId: string,
        add: boolean,
    ): Promise<void> {
        return new Promise((resolve, reject) => {
            // Tests a list of state events, returning true if it's in the state
            // we're waiting for it to be in
            function eventsInIntendedState(evList?: MatrixEvent[]): boolean {
                const widgetPresent = evList?.some((ev) => {
                    return ev.getContent() && ev.getContent()["id"] === widgetId;
                });
                if (add) {
                    return !!widgetPresent;
                } else {
                    return !widgetPresent;
                }
            }

            const room = client.getRoom(roomId);
            // TODO: Enable support for m.widget event type (https://github.com/vector-im/element-web/issues/13111)
            const startingWidgetEvents = room?.currentState.getStateEvents("im.vector.modular.widgets");
            if (eventsInIntendedState(startingWidgetEvents)) {
                resolve();
                return;
            }

            function onRoomStateEvents(ev: MatrixEvent): void {
                if (ev.getRoomId() !== roomId || ev.getType() !== "im.vector.modular.widgets") return;

                // TODO: Enable support for m.widget event type (https://github.com/vector-im/element-web/issues/13111)
                const currentWidgetEvents = room?.currentState.getStateEvents("im.vector.modular.widgets");

                if (eventsInIntendedState(currentWidgetEvents)) {
                    client.removeListener(RoomStateEvent.Events, onRoomStateEvents);
                    clearTimeout(timerId);
                    resolve();
                }
            }
            const timerId = window.setTimeout(() => {
                client.removeListener(RoomStateEvent.Events, onRoomStateEvents);
                reject(new Error("Timed out waiting for widget ID " + widgetId + " to appear"));
            }, WIDGET_WAIT_TIME);
            client.on(RoomStateEvent.Events, onRoomStateEvents);
        });
    }

    public static setUserWidget(
        client: MatrixClient,
        widgetId: string,
        widgetType: WidgetType,
        widgetUrl: string,
        widgetName: string,
        widgetData: IWidgetData,
    ): Promise<void> {
        // Get the current widgets and clone them before we modify them, otherwise
        // we'll modify the content of the old event.
        const userWidgets = objectClone(WidgetUtils.getUserWidgets(client));

        // Delete existing widget with ID
        try {
            delete userWidgets[widgetId];
        } catch {
            logger.error(`$widgetId is non-configurable`);
        }

        const addingWidget = Boolean(widgetUrl);

        const userId = client.getSafeUserId();

        const content = {
            id: widgetId,
            type: widgetType.preferred,
            url: widgetUrl,
            name: widgetName,
            data: widgetData,
            creatorUserId: userId,
        };

        // Add new widget / update
        if (addingWidget) {
            userWidgets[widgetId] = {
                content: content,
                sender: userId,
                state_key: widgetId,
                type: "m.widget",
                id: widgetId,
            };
        }

        // This starts listening for when the echo comes back from the server
        // since the widget won't appear added until this happens. If we don't
        // wait for this, the action will complete but if the user is fast enough,
        // the widget still won't actually be there.
        return client
            .setAccountData("m.widgets", userWidgets)
            .then(() => {
                return WidgetUtils.waitForUserWidget(client, widgetId, addingWidget);
            })
            .then(() => {
                dis.dispatch({ action: "user_widget_updated" });
            });
    }

    public static setRoomWidget(
        client: MatrixClient,
        roomId: string,
        widgetId: string,
        widgetType?: WidgetType,
        widgetUrl?: string,
        widgetName?: string,
        widgetData?: IWidgetData,
        widgetAvatarUrl?: string,
    ): Promise<void> {
        let content: Partial<IWidget> & { avatar_url?: string };

        const addingWidget = Boolean(widgetUrl);

        if (addingWidget) {
            content = {
                // TODO: Enable support for m.widget event type (https://github.com/vector-im/element-web/issues/13111)
                // For now we'll send the legacy event type for compatibility with older apps/elements
                type: widgetType?.legacy,
                url: widgetUrl,
                name: widgetName,
                data: widgetData,
                avatar_url: widgetAvatarUrl,
            };
        } else {
            content = {};
        }

        return WidgetUtils.setRoomWidgetContent(client, roomId, widgetId, content as IWidget);
    }

    public static setRoomWidgetContent(
        client: MatrixClient,
        roomId: string,
        widgetId: string,
        content: IWidget & Record<string, any>,
    ): Promise<void> {
        const addingWidget = !!content.url;

        WidgetEchoStore.setRoomWidgetEcho(roomId, widgetId, content);

        // TODO: Enable support for m.widget event type (https://github.com/vector-im/element-web/issues/13111)
        return client
            .sendStateEvent(roomId, "im.vector.modular.widgets", content, widgetId)
            .then(() => {
                return WidgetUtils.waitForRoomWidget(client, widgetId, roomId, addingWidget);
            })
            .finally(() => {
                WidgetEchoStore.removeRoomWidgetEcho(roomId, widgetId);
            });
    }

    /**
     * Get room specific widgets
     * @param  {Room} room The room to get widgets force
     * @returns {[object]} Array containing current / active room widgets
     */
    public static getRoomWidgets(room: Room): MatrixEvent[] {
        // TODO: Enable support for m.widget event type (https://github.com/vector-im/element-web/issues/13111)
        const appsStateEvents = room.currentState.getStateEvents("im.vector.modular.widgets");
        if (!appsStateEvents) {
            return [];
        }

        return appsStateEvents.filter((ev) => {
            return ev.getContent().type && ev.getContent().url;
        });
    }

    /**
     * Get user specific widgets (not linked to a specific room)
     * @param client The matrix client of the logged-in user
     * @returns {object} Event content object containing current / active user widgets
     */
    public static getUserWidgets(client: MatrixClient | undefined): Record<string, UserWidget> {
        if (!client) {
            throw new Error("User not logged in");
        }
        const userWidgets = client.getAccountData("m.widgets");
        if (userWidgets && userWidgets.getContent()) {
            return userWidgets.getContent();
        }
        return {};
    }

    /**
     * Get user specific widgets (not linked to a specific room) as an array
     * @param client The matrix client of the logged-in user
     * @returns {[object]} Array containing current / active user widgets
     */
    public static getUserWidgetsArray(client: MatrixClient | undefined): UserWidget[] {
        return Object.values(WidgetUtils.getUserWidgets(client));
    }

    /**
     * Get active stickerpicker widgets (stickerpickers are user widgets by nature)
     * @param client The matrix client of the logged-in user
     * @returns {[object]} Array containing current / active stickerpicker widgets
     */
    public static getStickerpickerWidgets(client: MatrixClient | undefined): UserWidget[] {
        const widgets = WidgetUtils.getUserWidgetsArray(client);
        return widgets.filter((widget) => widget.content?.type === "m.stickerpicker");
    }

    /**
     * Get all integration manager widgets for this user.
     * @param client The matrix client of the logged-in user
     * @returns {Object[]} An array of integration manager user widgets.
     */
    public static getIntegrationManagerWidgets(client: MatrixClient | undefined): UserWidget[] {
        const widgets = WidgetUtils.getUserWidgetsArray(client);
        return widgets.filter((w) => w.content?.type === "m.integration_manager");
    }

    /**
     * Remove all stickerpicker widgets (stickerpickers are user widgets by nature)
     * @param client The matrix client of the logged-in user
     * @returns {Promise} Resolves on account data updated
     */
    public static async removeStickerpickerWidgets(client: MatrixClient | undefined): Promise<void> {
        if (!client) {
            throw new Error("User not logged in");
        }
        const widgets = client.getAccountData("m.widgets");
        if (!widgets) return;
        const userWidgets: Record<string, IWidgetEvent> = widgets.getContent() || {};
        Object.entries(userWidgets).forEach(([key, widget]) => {
            if (widget.content && widget.content.type === "m.stickerpicker") {
                delete userWidgets[key];
            }
        });
        await client.setAccountData("m.widgets", userWidgets);
    }

    public static async addJitsiWidget(
        client: MatrixClient,
        roomId: string,
        type: CallType,
        name: string,
        isVideoChannel: boolean,
        oobRoomName?: string,
    ): Promise<void> {
        const domain = Jitsi.getInstance().preferredDomain;
        const auth = (await Jitsi.getInstance().getJitsiAuth()) ?? undefined;

        // Must be globally unique, although predicatablity is not important, the js-sdk has functions to generate
        // secure ranom strings, and speed is not important here.
        const widgetId = secureRandomString(24);

        let confId: string;
        if (auth === "openidtoken-jwt") {
            // Create conference ID from room ID
            // For compatibility with Jitsi, use base32 without padding.
            // More details here:
            // https://github.com/matrix-org/prosody-mod-auth-matrix-user-verification
            confId = base32.stringify(new TextEncoder().encode(roomId), { pad: false });
        } else {
            // Create a random conference ID (capitalised so the name looks sensible in Jitsi)
            confId = `Jitsi${capitalize(secureRandomStringFrom(24, LOWERCASE))}`;
        }

        // TODO: Remove URL hacks when the mobile clients eventually support v2 widgets
        const widgetUrl = new URL(WidgetUtils.getLocalJitsiWrapperUrl({ auth }));
        widgetUrl.search = ""; // Causes the URL class use searchParams instead
        widgetUrl.searchParams.set("confId", confId);

        await WidgetUtils.setRoomWidget(client, roomId, widgetId, WidgetType.JITSI, widgetUrl.toString(), name, {
            conferenceId: confId,
            roomName: oobRoomName ?? client.getRoom(roomId)?.name,
            isAudioOnly: type === CallType.Voice,
            isVideoChannel,
            domain,
            auth,
        });
    }

    public static makeAppConfig(
        appId: string,
        app: Partial<IApp>,
        senderUserId: string,
        roomId: string | undefined,
        eventId: string | undefined,
    ): IApp {
        if (!senderUserId) {
            throw new Error("Widgets must be created by someone - provide a senderUserId");
        }
        app.creatorUserId = senderUserId;

        app.id = appId;
        app.roomId = roomId;
        app.eventId = eventId;
        app.name = app.name || app.type;

        return app as IApp;
    }

    public static getLocalJitsiWrapperUrl(opts: { forLocalRender?: boolean; auth?: string } = {}): string {
        // NB. we can't just encodeURIComponent all of these because the $ signs need to be there
        const queryStringParts = [
            "conferenceDomain=$domain",
            "conferenceId=$conferenceId",
            "isAudioOnly=$isAudioOnly",
            "startWithAudioMuted=$startWithAudioMuted",
            "startWithVideoMuted=$startWithVideoMuted",
            "isVideoChannel=$isVideoChannel",
            "displayName=$matrix_display_name",
            "avatarUrl=$matrix_avatar_url",
            "userId=$matrix_user_id",
            "roomId=$matrix_room_id",
            "theme=$theme",
            "roomName=$roomName",
            `supportsScreensharing=${PlatformPeg.get()?.supportsJitsiScreensharing()}`,
            "language=$org.matrix.msc2873.client_language",
        ];
        if (opts.auth) {
            queryStringParts.push(`auth=${opts.auth}`);
        }
        const queryString = queryStringParts.join("&");

        let baseUrl = window.location.href;
        if (window.location.protocol !== "https:" && !opts.forLocalRender) {
            // Use an external wrapper if we're not locally rendering the widget. This is usually
            // the URL that will end up in the widget event, so we want to make sure it's relatively
            // safe to send.
            // We'll end up using a local render URL when we see a Jitsi widget anyways, so this is
            // really just for backwards compatibility and to appease the spec.
            baseUrl = PlatformPeg.get()!.baseUrl;
        }
        const url = new URL("jitsi.html#" + queryString, baseUrl); // this strips hash fragment from baseUrl
        return url.href;
    }

    public static getWidgetName(app?: IWidget): string {
        return app?.name?.trim() || _t("widget|no_name");
    }

    public static getWidgetDataTitle(app?: IWidget): string {
        return app?.data?.title?.trim() || "";
    }

    public static getWidgetUid(app?: IApp | IWidget): string {
        return app ? WidgetUtils.calcWidgetUid(app.id, isAppWidget(app) ? app.roomId : undefined) : "";
    }

    public static calcWidgetUid(widgetId: string, roomId?: string): string {
        return roomId ? `room_${roomId}_${widgetId}` : `user_${widgetId}`;
    }

    public static editWidget(room: Room, app: IWidget): void {
        // noinspection JSIgnoredPromiseFromCall
        IntegrationManagers.sharedInstance()
            .getPrimaryManager()
            ?.open(room, "type_" + app.type, app.id);
    }

    public static isManagedByManager(app: IWidget): boolean {
        if (WidgetUtils.isScalarUrl(app.url)) {
            const managers = IntegrationManagers.sharedInstance();
            if (managers.hasManager()) {
                // TODO: Pick the right manager for the widget
                const defaultManager = managers.getPrimaryManager();
                return WidgetUtils.isScalarUrl(defaultManager?.apiUrl);
            }
        }
        return false;
    }
}

/**
 * Hook to get the widgets for a room and update when they change
 * @param room the room to get widgets for
 */
export const useWidgets = (room: Room): IApp[] => {
    const [apps, setApps] = useState<IApp[]>(() => WidgetStore.instance.getApps(room.roomId));

    const updateApps = useCallback(() => {
        // Copy the array so that we always trigger a re-render, as some updates mutate the array of apps/settings
        setApps([...WidgetStore.instance.getApps(room.roomId)]);
    }, [room]);

    useEffect(updateApps, [room, updateApps]);
    useEventEmitter(WidgetStore.instance, room.roomId, updateApps);
    useEventEmitter(WidgetLayoutStore.instance, WidgetLayoutStore.emissionForRoom(room), updateApps);

    return apps;
};
