/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */

import { expect } from 'chai';
import sinon, { SinonStubbedInstance } from 'sinon';
import { SecretStorage } from 'vscode';
import { PROVIDER_ID } from '../config/constants';
import { SecretStorageFake } from '../test/helpers/secret-storage';
import { AuthStorage, RefreshableAuthenticationSession } from './storage';

const SESSIONS_KEY = `${PROVIDER_ID}.sessions`;
const DEFAULT_SESSION: RefreshableAuthenticationSession = {
  id: '1',
  refreshToken: '//42',
  account: { id: 'foo', label: 'bar' },
  scopes: ['baz'],
};

describe('ServerStorage', () => {
  let secretsStub: SinonStubbedInstance<
    Pick<SecretStorage, 'get' | 'store' | 'delete'>
  >;
  let authStorage: AuthStorage;

  beforeEach(() => {
    secretsStub = new SecretStorageFake();
    authStorage = new AuthStorage(
      secretsStub as Partial<SecretStorage> as SecretStorage,
    );
  });

  afterEach(() => {
    sinon.restore();
  });

  describe('getSessions', () => {
    it('returns no sessions when none are stored', async () => {
      await expect(authStorage.getSession()).to.eventually.equal(undefined);

      sinon.assert.calledOnceWithExactly(secretsStub.get, SESSIONS_KEY);
    });

    it('returns a single session when one is stored', async () => {
      await authStorage.storeSession(DEFAULT_SESSION);

      await expect(authStorage.getSession()).to.eventually.deep.equal(
        DEFAULT_SESSION,
      );

      sinon.assert.calledOnceWithExactly(secretsStub.get, SESSIONS_KEY);
    });

    it('throws an error when the stored sessions do not conform to the expected schema', async () => {
      secretsStub.store(
        SESSIONS_KEY,
        JSON.stringify([
          { ...DEFAULT_SESSION, account: "shouldn't be a string" },
        ]),
      );

      await expect(authStorage.getSession()).to.eventually.be.rejectedWith(
        /received string/,
      );
    });
  });

  describe('storeSession', () => {
    it('stores the provided session', async () => {
      await authStorage.storeSession(DEFAULT_SESSION);

      await expect(authStorage.getSession()).to.eventually.deep.equal(
        DEFAULT_SESSION,
      );
      sinon.assert.calledOnceWithExactly(
        secretsStub.store,
        SESSIONS_KEY,
        JSON.stringify([DEFAULT_SESSION]),
      );
    });

    it('overrides the existing stored session', async () => {
      const newSession = { ...DEFAULT_SESSION, id: '2' };
      await authStorage.storeSession(DEFAULT_SESSION);

      await authStorage.storeSession(newSession);

      await expect(authStorage.getSession()).to.eventually.deep.equal(
        newSession,
      );
      sinon.assert.calledTwice(secretsStub.store);
      sinon.assert.calledWith(
        secretsStub.store.firstCall,
        SESSIONS_KEY,
        JSON.stringify([DEFAULT_SESSION]),
      );
      sinon.assert.calledWith(
        secretsStub.store.secondCall,
        SESSIONS_KEY,
        JSON.stringify([newSession]),
      );
    });
  });

  describe('removeSession', () => {
    it('returns undefined when no sessions exist', async () => {
      await expect(
        authStorage.removeSession(DEFAULT_SESSION.id),
      ).to.eventually.equal(undefined);

      sinon.assert.notCalled(secretsStub.delete);
    });

    it('returns undefined when the session does not exist', async () => {
      await authStorage.storeSession(DEFAULT_SESSION);

      await expect(
        authStorage.removeSession('does not exist'),
      ).to.eventually.equal(undefined);

      sinon.assert.notCalled(secretsStub.delete);
    });

    it('returns the session when it is the only one and is removed', async () => {
      await authStorage.storeSession(DEFAULT_SESSION);

      await expect(
        authStorage.removeSession(DEFAULT_SESSION.id),
      ).to.eventually.deep.equal(DEFAULT_SESSION);

      sinon.assert.calledOnceWithExactly(secretsStub.delete, SESSIONS_KEY);
    });
  });
});