import { AdminSessionService } from './admin-session.service';
import type { IamService } from '../iam/iam.service';

/**
 * Revocable admin sessions.
 *
 * Two contracts are locked down here. First, with tracking off nothing changes:
 * no `jti`, no row, and no extra query on an authenticated request. Second, with
 * it on, a revoked session stops working immediately — which is the whole point,
 * because before this table an issued token was usable for its full 12h no matter
 * what happened centrally.
 */
describe('AdminSessionService', () => {
  const ORIGINAL_ENV = process.env;

  const build = (opts: { iamEnabled?: boolean; tracking?: string | null } = {}) => {
    process.env = { ...ORIGINAL_ENV };
    delete process.env.AUTH_SESSION_TRACKING;
    if (opts.tracking != null) process.env.AUTH_SESSION_TRACKING = opts.tracking;

    const prisma = {
      adminSession: {
        create: jest.fn().mockResolvedValue({}),
        findUnique: jest.fn(),
        updateMany: jest.fn().mockResolvedValue({ count: 2 }),
      },
    };
    const iam = { enabled: opts.iamEnabled ?? false } as IamService;

    return { service: new AdminSessionService(prisma as never, iam), prisma };
  };

  afterEach(() => {
    process.env = ORIGINAL_ENV;
  });

  /* ─────────────── off by default ─────────────── */

  it('is off in a deployment that does not use the identity service', () => {
    expect(build().service.enabled).toBe(false);
  });

  it('turns itself on with the identity service, so central revocation reaches us', () => {
    expect(build({ iamEnabled: true }).service.enabled).toBe(true);
  });

  it('can be turned on on its own', () => {
    expect(build({ tracking: 'true' }).service.enabled).toBe(true);
  });

  it('can be turned off explicitly even with the identity service on', () => {
    // Opting out of the per-request lookup; central revocation then cannot reach here
    expect(build({ iamEnabled: true, tracking: 'false' }).service.enabled).toBe(false);
  });

  /* ─────────────── unchanged behaviour while off ─────────────── */

  it('issues no token id and writes no row while off', async () => {
    const { service, prisma } = build();

    expect(service.newTokenId()).toBeNull();
    await service.record({ jti: 'x', adminId: 'a' });

    expect(prisma.adminSession.create).not.toHaveBeenCalled();
  });

  it('authenticates without a database lookup while off', async () => {
    const { service, prisma } = build();

    await expect(service.isActive('some-jti')).resolves.toBe(true);
    expect(prisma.adminSession.findUnique).not.toHaveBeenCalled();
  });

  /* ─────────────── enforcement while on ─────────────── */

  it('accepts a live session', async () => {
    const { service, prisma } = build({ iamEnabled: true });
    prisma.adminSession.findUnique.mockResolvedValue({ revokedAt: null });

    await expect(service.isActive('jti-1')).resolves.toBe(true);
  });

  it('refuses a revoked session', async () => {
    const { service, prisma } = build({ iamEnabled: true });
    prisma.adminSession.findUnique.mockResolvedValue({ revokedAt: new Date() });

    // The gap this closes: previously the token kept working until it expired
    await expect(service.isActive('jti-1')).resolves.toBe(false);
  });

  it('refuses a token whose session row is gone', async () => {
    const { service, prisma } = build({ iamEnabled: true });
    prisma.adminSession.findUnique.mockResolvedValue(null);

    await expect(service.isActive('jti-1')).resolves.toBe(false);
  });

  it('keeps tokens issued before tracking was switched on working', async () => {
    const { service, prisma } = build({ iamEnabled: true });

    // Such a token carries no jti; refusing it would sign every admin out at once
    await expect(service.isActive(undefined)).resolves.toBe(true);
    expect(prisma.adminSession.findUnique).not.toHaveBeenCalled();
  });

  /* ─────────────── recording and revoking ─────────────── */

  it('records the session with an expiry derived from the token lifetime', async () => {
    process.env.JWT_EXPIRES_IN = '12h';
    const { service, prisma } = build({ iamEnabled: true });
    process.env.JWT_EXPIRES_IN = '12h';

    await service.record({ jti: 'jti-1', adminId: 'admin-1', iamSessionId: 'sid-1', iamSub: 'sub-1' });

    const data = prisma.adminSession.create.mock.calls[0][0].data;
    expect(data).toMatchObject({ jti: 'jti-1', adminId: 'admin-1', iamSessionId: 'sid-1' });
    expect(data.expiresAt.getTime()).toBeGreaterThan(Date.now() + 11 * 3600 * 1000);
  });

  it('never breaks login when the session row cannot be written', async () => {
    const { service, prisma } = build({ iamEnabled: true });
    prisma.adminSession.create.mockRejectedValue(new Error('unique violation'));

    // Worst case is a session that cannot be revoked early — not a failed login
    await expect(service.record({ jti: 'jti-1', adminId: 'a' })).resolves.toBeUndefined();
  });

  it('revokes by the identity service session id', async () => {
    const { service, prisma } = build({ iamEnabled: true });

    await expect(service.revokeByIamSession('sid-1')).resolves.toBe(2);
    expect(prisma.adminSession.updateMany).toHaveBeenCalledWith({
      where: { iamSessionId: 'sid-1', revokedAt: null },
      data: expect.objectContaining({ revokedReason: 'iam_backchannel_logout' }),
    });
  });

  it('revokes every session of an identity when the token names only a subject', async () => {
    const { service, prisma } = build({ iamEnabled: true });

    await service.revokeByIamSubject('sub-1');
    expect(prisma.adminSession.updateMany).toHaveBeenCalledWith({
      where: { iamSub: 'sub-1', revokedAt: null },
      data: expect.objectContaining({ revokedReason: 'iam_backchannel_logout' }),
    });
  });

  it('revokes every session of a local admin', async () => {
    const { service, prisma } = build({ iamEnabled: true });

    await service.revokeAllForAdmin('admin-1', 'account_disabled');
    expect(prisma.adminSession.updateMany).toHaveBeenCalledWith({
      where: { adminId: 'admin-1', revokedAt: null },
      data: expect.objectContaining({ revokedReason: 'account_disabled' }),
    });
  });

  it('does not touch anything while off', async () => {
    const { service, prisma } = build();

    await expect(service.revokeByIamSession('sid-1')).resolves.toBe(0);
    expect(prisma.adminSession.updateMany).not.toHaveBeenCalled();
  });
});