/*
Copyright 2023 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 type { Page, Request } from "@playwright/test";
import type { Client } from "./client";

export class Network {
    private isOffline = false;
    private readonly setupPromise: Promise<void>;

    constructor(private page: Page, private client: Client) {
        this.setupPromise = this.setupRoute();
    }

    /**
     * Checks if the request is from the client associated with this network object.
     * We do this so that other clients (eg: bots) are not affected by the network change.
     */
    private async isRequestFromOurClient(request: Request): Promise<boolean> {
        const accessToken = await this.client.evaluate((client) => client.getAccessToken());
        const authHeader = await request.headerValue("Authorization");
        return authHeader === `Bearer ${accessToken}`;
    }

    private async setupRoute() {
        await this.page.route("**/_matrix/**", async (route) => {
            if (this.isOffline && (await this.isRequestFromOurClient(route.request()))) {
                route.abort();
            } else {
                route.continue();
            }
        });
    }

    // Intercept all /_matrix/ networking requests for client and fail them
    async goOffline(): Promise<void> {
        await this.setupPromise;
        this.isOffline = true;
    }

    // Remove intercept on all /_matrix/ networking requests for this client
    async goOnline(): Promise<void> {
        await this.setupPromise;
        this.isOffline = false;
    }
}