/*
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.
*/

/// <reference types="cypress" />

import type { ISendEventResponse, MatrixClient, Room } from "matrix-js-sdk/src/matrix";
import { HomeserverInstance } from "../plugins/utils/homeserver";
import { Credentials } from "./homeserver";
import Chainable = Cypress.Chainable;

interface CreateBotOpts {
    /**
     * A prefix to use for the userid. If unspecified, "bot_" will be used.
     */
    userIdPrefix?: string;
    /**
     * Whether the bot should automatically accept all invites.
     */
    autoAcceptInvites?: boolean;
    /**
     * The display name to give to that bot user
     */
    displayName?: string;
    /**
     * Whether or not to start the syncing client.
     */
    startClient?: boolean;
    /**
     * Whether or not to generate cross-signing keys
     */
    bootstrapCrossSigning?: boolean;
}

const defaultCreateBotOptions = {
    userIdPrefix: "bot_",
    autoAcceptInvites: true,
    startClient: true,
    bootstrapCrossSigning: true,
} as CreateBotOpts;

export interface CypressBot extends MatrixClient {
    __cypress_password: string;
}

declare global {
    // eslint-disable-next-line @typescript-eslint/no-namespace
    namespace Cypress {
        interface Chainable {
            /**
             * Returns a new Bot instance
             * @param homeserver the instance on which to register the bot user
             * @param opts create bot options
             */
            getBot(homeserver: HomeserverInstance, opts: CreateBotOpts): Chainable<CypressBot>;
            /**
             * Returns a new Bot instance logged in as an existing user
             * @param homeserver the instance on which to register the bot user
             * @param username the username for the bot to log in with
             * @param password the password for the bot to log in with
             * @param opts create bot options
             */
            loginBot(
                homeserver: HomeserverInstance,
                username: string,
                password: string,
                opts: CreateBotOpts,
            ): Chainable<MatrixClient>;
            /**
             * Let a bot join a room
             * @param cli The bot's MatrixClient
             * @param roomId ID of the room to join
             */
            botJoinRoom(cli: MatrixClient, roomId: string): Chainable<Room>;
            /**
             * Let a bot join a room by name
             * @param cli The bot's MatrixClient
             * @param roomName Name of the room to join
             */
            botJoinRoomByName(cli: MatrixClient, roomName: string): Chainable<Room>;
            /**
             * Send a message as a bot into a room
             * @param cli The bot's MatrixClient
             * @param roomId ID of the room to join
             * @param message the message body to send
             */
            botSendMessage(cli: MatrixClient, roomId: string, message: string): Chainable<ISendEventResponse>;
        }
    }
}

function setupBotClient(
    homeserver: HomeserverInstance,
    credentials: Credentials,
    opts: CreateBotOpts,
): Chainable<MatrixClient> {
    opts = Object.assign({}, defaultCreateBotOptions, opts);
    return cy.window({ log: false }).then((win) => {
        const keys = {};

        const getCrossSigningKey = (type: string) => {
            return keys[type];
        };

        const saveCrossSigningKeys = (k: Record<string, Uint8Array>) => {
            Object.assign(keys, k);
        };

        const cli = new win.matrixcs.MatrixClient({
            baseUrl: homeserver.baseUrl,
            userId: credentials.userId,
            deviceId: credentials.deviceId,
            accessToken: credentials.accessToken,
            store: new win.matrixcs.MemoryStore(),
            scheduler: new win.matrixcs.MatrixScheduler(),
            cryptoStore: new win.matrixcs.MemoryCryptoStore(),
            cryptoCallbacks: { getCrossSigningKey, saveCrossSigningKeys },
        });

        if (opts.autoAcceptInvites) {
            cli.on(win.matrixcs.RoomMemberEvent.Membership, (event, member) => {
                if (member.membership === "invite" && member.userId === cli.getUserId()) {
                    cli.joinRoom(member.roomId);
                }
            });
        }

        if (!opts.startClient) {
            return cy.wrap(cli);
        }

        return cy.wrap(
            cli
                .initCrypto()
                .then(() => cli.setGlobalErrorOnUnknownDevices(false))
                .then(() => cli.startClient())
                .then(async () => {
                    if (opts.bootstrapCrossSigning) {
                        await cli.bootstrapCrossSigning({
                            authUploadDeviceSigningKeys: async (func) => {
                                await func({
                                    type: "m.login.password",
                                    identifier: {
                                        type: "m.id.user",
                                        user: credentials.userId,
                                    },
                                    password: credentials.password,
                                });
                            },
                        });
                    }
                })
                .then(() => cli),
            // extra timeout, as this sometimes takes a while
            { timeout: 30_000 },
        );
    });
}

Cypress.Commands.add("getBot", (homeserver: HomeserverInstance, opts: CreateBotOpts): Chainable<CypressBot> => {
    opts = Object.assign({}, defaultCreateBotOptions, opts);
    const username = Cypress._.uniqueId(opts.userIdPrefix);
    const password = Cypress._.uniqueId("password_");
    return cy
        .registerUser(homeserver, username, password, opts.displayName)
        .then((credentials) => {
            cy.log(`Registered bot user ${username} with displayname ${opts.displayName}`);
            return setupBotClient(homeserver, credentials, opts);
        })
        .then((client): Chainable<CypressBot> => {
            Object.assign(client, { __cypress_password: password });
            return cy.wrap(client as CypressBot);
        });
});

Cypress.Commands.add(
    "loginBot",
    (
        homeserver: HomeserverInstance,
        username: string,
        password: string,
        opts: CreateBotOpts,
    ): Chainable<MatrixClient> => {
        opts = Object.assign({}, defaultCreateBotOptions, { bootstrapCrossSigning: false }, opts);
        return cy.loginUser(homeserver, username, password).then((credentials) => {
            return setupBotClient(homeserver, credentials, opts);
        });
    },
);

Cypress.Commands.add("botJoinRoom", (cli: MatrixClient, roomId: string): Chainable<Room> => {
    return cy.wrap(cli.joinRoom(roomId));
});

Cypress.Commands.add("botJoinRoomByName", (cli: MatrixClient, roomName: string): Chainable<Room> => {
    const room = cli.getRooms().find((r) => r.getDefaultRoomName(cli.getUserId()) === roomName);

    if (room) {
        return cy.botJoinRoom(cli, room.roomId);
    }

    return cy.wrap(Promise.reject(`Bot room join failed. Cannot find room '${roomName}'`));
});

Cypress.Commands.add(
    "botSendMessage",
    (cli: MatrixClient, roomId: string, message: string): Chainable<ISendEventResponse> => {
        return cy.wrap(
            cli.sendMessage(roomId, {
                msgtype: "m.text",
                body: message,
            }),
            { log: false },
        );
    },
);
