import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';

// Mock the sync-state + deny-list DDB reads so the handler test exercises pure
// orchestration. vi.hoisted keeps the mock fns available to the hoisted factories.
const { readMock, denyMock } = vi.hoisted(() => ({ readMock: vi.fn(), denyMock: vi.fn() }));
vi.mock('../src/sync-state.js', async (importOriginal) => {
  const actual = await importOriginal<typeof import('../src/sync-state.js')>();
  return { ...actual, readLastSuccessfulSyncMs: readMock };
});
vi.mock('../src/deny-list.js', () => ({ isSubDenied: denyMock }));

import { handler } from '../src/index.js';
import { FINANCE_READ, FINANCE_ADMIN, OPS_READ, ALL_TIER_SCOPES } from '../src/scopes.js';

function event(groups: string[], clientId = 'sh-agentforce-finance', sub = 'user-sub-1') {
  return {
    callerContext: { clientId },
    request: { groupConfiguration: { groupsToOverride: groups }, userAttributes: { sub } },
    response: {},
  };
}

function accessGen(res: Awaited<ReturnType<typeof handler>>) {
  const d = res.response?.['claimsAndScopeOverrideDetails'] as
    | { accessTokenGeneration?: { scopesToSuppress?: string[]; scopesToAdd?: string[] } }
    | undefined;
  return d?.accessTokenGeneration ?? {};
}

describe('pre-token handler', () => {
  beforeEach(() => {
    vi.useFakeTimers();
    vi.setSystemTime(new Date('2026-06-26T18:00:00Z'));
    process.env['SYNC_STATE_TABLE'] = 'sh-mcp-sync-state';
    process.env['DENY_LIST_TABLE'] = 'sh-mcp-deny-list';
    readMock.mockReset();
    denyMock.mockReset();
    denyMock.mockResolvedValue(false); // not denied unless a test says otherwise
  });
  afterEach(() => vi.useRealTimers());

  it('HARD REVOCATION: a deny-listed sub is stripped to NO tier scopes, ignoring groups', async () => {
    readMock.mockResolvedValue(Date.now()); // fresh sync — irrelevant once denied
    denyMock.mockResolvedValue(true);
    const res = await handler(event(['sh-mcp-admin']));
    const gen = accessGen(res);
    expect(gen.scopesToAdd).toBeUndefined();
    // Every issued tier scope is suppressed → the principal keeps none.
    for (const s of ALL_TIER_SCOPES) expect(gen.scopesToSuppress).toContain(s);
  });

  it('deny-list is skipped when DENY_LIST_TABLE is unset (never blocks issuance on missing config)', async () => {
    delete process.env['DENY_LIST_TABLE'];
    readMock.mockResolvedValue(Date.now());
    const res = await handler(event(['sh-mcp-finance']));
    expect(denyMock).not.toHaveBeenCalled();
    expect(accessGen(res).scopesToSuppress).not.toContain(FINANCE_READ);
  });

  it('NEVER emits scopesToAdd, on any path', async () => {
    readMock.mockResolvedValue(Date.now()); // fresh
    for (const groups of [[], ['sh-mcp-ops'], ['sh-mcp-admin']]) {
      const res = await handler(event(groups));
      expect(accessGen(res).scopesToAdd).toBeUndefined();
    }
  });

  it('fresh sync: finance group keeps finance:read, loses finance:admin', async () => {
    readMock.mockResolvedValue(Date.now() - 60_000); // 1 min old → fresh
    const res = await handler(event(['sh-mcp-finance']));
    const suppress = accessGen(res).scopesToSuppress ?? [];
    expect(suppress).toContain(FINANCE_ADMIN);
    expect(suppress).not.toContain(FINANCE_READ);
    expect(suppress).not.toContain(OPS_READ);
  });

  it('FAIL CLOSED: stale sync drops an admin to base ops:read', async () => {
    readMock.mockResolvedValue(Date.now() - 60 * 60_000); // 60 min old → stale
    const res = await handler(event(['sh-mcp-admin']));
    const suppress = accessGen(res).scopesToSuppress ?? [];
    expect(suppress).toContain(FINANCE_READ);
    expect(suppress).toContain(FINANCE_ADMIN);
    expect(suppress).not.toContain(OPS_READ);
  });

  it('FAIL CLOSED: missing sync marker (null) drops to base', async () => {
    readMock.mockResolvedValue(null);
    const res = await handler(event(['sh-mcp-finance']));
    expect(accessGen(res).scopesToSuppress).toContain(FINANCE_READ);
  });

  it('FAIL CLOSED: unset sync-state table never reads DDB and drops to base', async () => {
    delete process.env['SYNC_STATE_TABLE'];
    const res = await handler(event(['sh-mcp-admin']));
    expect(readMock).not.toHaveBeenCalled();
    expect(accessGen(res).scopesToSuppress).toContain(FINANCE_ADMIN);
  });
});