/*
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 fetchMock from "fetch-mock-jest";
import { completeAuthorizationCodeGrant } from "matrix-js-sdk/src/oidc/authorize";
import * as randomStringUtils from "matrix-js-sdk/src/randomstring";
import { BearerTokenResponse } from "matrix-js-sdk/src/oidc/validate";
import { mocked } from "jest-mock";
import { Crypto } from "@peculiar/webcrypto";
import { getRandomValues } from "node:crypto";

import { completeOidcLogin, startOidcLogin } from "../../../src/utils/oidc/authorize";
import { makeDelegatedAuthConfig } from "../../test-utils/oidc";
import { OidcClientError } from "../../../src/utils/oidc/error";
import { mockPlatformPeg } from "../../test-utils";

jest.unmock("matrix-js-sdk/src/randomstring");

jest.mock("matrix-js-sdk/src/oidc/authorize", () => ({
    ...jest.requireActual("matrix-js-sdk/src/oidc/authorize"),
    completeAuthorizationCodeGrant: jest.fn(),
}));

const webCrypto = new Crypto();

describe("OIDC authorization", () => {
    const issuer = "https://auth.com/";
    const homeserverUrl = "https://matrix.org";
    const identityServerUrl = "https://is.org";
    const clientId = "xyz789";
    const baseUrl = "https://test.com";

    const delegatedAuthConfig = makeDelegatedAuthConfig(issuer);

    // to restore later
    const realWindowLocation = window.location;

    beforeEach(() => {
        // @ts-ignore allow delete of non-optional prop
        delete window.location;
        // @ts-ignore ugly mocking
        window.location = {
            href: baseUrl,
            origin: baseUrl,
        };

        jest.spyOn(randomStringUtils, "randomString").mockRestore();
        mockPlatformPeg();
        Object.defineProperty(window, "crypto", {
            value: {
                getRandomValues,
                randomUUID: jest.fn().mockReturnValue("not-random-uuid"),
                subtle: webCrypto.subtle,
            },
        });
    });

    beforeAll(() => {
        fetchMock.get(`${delegatedAuthConfig.issuer}.well-known/openid-configuration`, delegatedAuthConfig.metadata);
    });

    afterAll(() => {
        window.location = realWindowLocation;
    });

    describe("startOidcLogin()", () => {
        it("navigates to authorization endpoint with correct parameters", async () => {
            await startOidcLogin(delegatedAuthConfig, clientId, homeserverUrl);

            const expectedScopeWithoutDeviceId = `openid urn:matrix:org.matrix.msc2967.client:api:* urn:matrix:org.matrix.msc2967.client:device:`;

            const authUrl = new URL(window.location.href);

            expect(authUrl.searchParams.get("response_mode")).toEqual("query");
            expect(authUrl.searchParams.get("response_type")).toEqual("code");
            expect(authUrl.searchParams.get("client_id")).toEqual(clientId);
            expect(authUrl.searchParams.get("code_challenge_method")).toEqual("S256");

            // scope ends with a 10char randomstring deviceId
            const scope = authUrl.searchParams.get("scope")!;
            expect(scope.substring(0, scope.length - 10)).toEqual(expectedScopeWithoutDeviceId);
            expect(scope.substring(scope.length - 10)).toBeTruthy();

            // random string, just check they are set
            expect(authUrl.searchParams.has("state")).toBeTruthy();
            expect(authUrl.searchParams.has("nonce")).toBeTruthy();
            expect(authUrl.searchParams.has("code_challenge")).toBeTruthy();
        });
    });

    describe("completeOidcLogin()", () => {
        const state = "test-state-444";
        const code = "test-code-777";
        const queryDict = {
            code,
            state: state,
        };

        const tokenResponse: BearerTokenResponse = {
            access_token: "abc123",
            refresh_token: "def456",
            scope: "test",
            token_type: "Bearer",
            expires_at: 12345,
        };

        beforeEach(() => {
            mocked(completeAuthorizationCodeGrant)
                .mockClear()
                .mockResolvedValue({
                    oidcClientSettings: {
                        clientId,
                        issuer,
                    },
                    tokenResponse,
                    homeserverUrl,
                    identityServerUrl,
                    idTokenClaims: {
                        aud: "123",
                        iss: issuer,
                        sub: "123",
                        exp: 123,
                        iat: 456,
                    },
                });
        });

        it("should throw when query params do not include state and code", async () => {
            await expect(async () => await completeOidcLogin({})).rejects.toThrow(
                OidcClientError.InvalidQueryParameters,
            );
        });

        it("should make request complete authorization code grant", async () => {
            await completeOidcLogin(queryDict);

            expect(completeAuthorizationCodeGrant).toHaveBeenCalledWith(code, state);
        });

        it("should return accessToken, configured homeserver and identityServer", async () => {
            const result = await completeOidcLogin(queryDict);

            expect(result).toEqual({
                accessToken: tokenResponse.access_token,
                refreshToken: tokenResponse.refresh_token,
                homeserverUrl,
                identityServerUrl,
                issuer,
                clientId,
                idTokenClaims: result.idTokenClaims,
            });
        });
    });
});