import type { EmailVerificationToken } from '../auth.types';
import type { PasswordResetToken } from '../token.service';
import { logger } from '../../logging';

jest.mock('../../../config/unified.config', () => {
  const actual = jest.requireActual('../../../config/unified.config');
  return {
    ...actual,
    getDatabaseConfig: jest.fn(),
  };
});

const { getDatabaseConfig } = jest.requireMock(
  '../../../config/unified.config'
) as {
  getDatabaseConfig: jest.MockedFunction<
    () => {
      url: string;
      username: string;
      password: string;
      useMock?: boolean;
    }
  >;
};

getDatabaseConfig.mockReturnValue({
  url: '',
  username: '',
  password: '',
  useMock: true,
});

let TokenServiceClass: typeof import('../token.service').TokenService;

beforeAll(async () => {
  ({ TokenService: TokenServiceClass } = await import('../token.service'));
});

describe('TokenService (localStorage fallback)', () => {
  let service: TokenService;

  beforeEach(() => {
    getDatabaseConfig.mockReturnValue({
      url: '',
      username: '',
      password: '',
      useMock: true,
    });

    service = new TokenServiceClass();
    localStorage.clear();
  });

  it('stores and retrieves verification tokens with Date instances', async () => {
    const expiresAt = new Date('2025-01-01T00:00:00.000Z');
    const token: EmailVerificationToken = {
      userId: 'user-1',
      email: 'user@example.com',
      token: 'verify-123',
      expiresAt,
    };

    await service.saveVerificationToken(token);

    const stored = await service.findVerificationToken('verify-123');
    expect(stored).not.toBeNull();
    expect(stored?.expiresAt).toBeInstanceOf(Date);
    expect(stored?.expiresAt.getTime()).toBe(expiresAt.getTime());
  });

  it('removes verification tokens only for the targeted user', async () => {
    const expiry = new Date(Date.now() + 60_000);
    await service.saveVerificationToken({
      userId: 'user-a',
      email: 'a@example.com',
      token: 'token-a',
      expiresAt: expiry,
    });
    await service.saveVerificationToken({
      userId: 'user-b',
      email: 'b@example.com',
      token: 'token-b',
      expiresAt: expiry,
    });

    await service.deleteVerificationTokensForUser('user-a');

    expect(await service.findVerificationToken('token-a')).toBeNull();
    expect(await service.findVerificationToken('token-b')).not.toBeNull();
  });

  it('supports password reset token lifecycle (save, find, delete)', async () => {
    const expiresAt = new Date(Date.now() + 120_000);
    const token: PasswordResetToken = {
      userId: 'reset-user',
      email: 'reset@example.com',
      token: 'reset-123',
      expiresAt,
    };

    await service.savePasswordResetToken(token);

    const stored = await service.findPasswordResetToken('reset-123');
    expect(stored).not.toBeNull();
    expect(stored?.expiresAt).toBeInstanceOf(Date);

    await service.deletePasswordResetToken('reset-123');

    expect(await service.findPasswordResetToken('reset-123')).toBeNull();
  });

  it('removes password reset tokens by user id', async () => {
    const expiresAt = new Date(Date.now() + 120_000);
    await service.savePasswordResetToken({
      userId: 'reset-a',
      email: 'a@example.com',
      token: 'reset-a-token',
      expiresAt,
    });
    await service.savePasswordResetToken({
      userId: 'reset-b',
      email: 'b@example.com',
      token: 'reset-b-token',
      expiresAt,
    });

    await service.deletePasswordResetTokensForUser('reset-a');

    expect(await service.findPasswordResetToken('reset-a-token')).toBeNull();
    expect(
      await service.findPasswordResetToken('reset-b-token')
    ).not.toBeNull();
  });

  it('cleans up expired tokens from both verification and reset stores', async () => {
    const past = new Date(Date.now() - 60_000);
    const future = new Date(Date.now() + 60_000);

    await service.saveVerificationToken({
      userId: 'expired',
      email: 'expired@example.com',
      token: 'expired-ver',
      expiresAt: past,
    });
    await service.saveVerificationToken({
      userId: 'valid',
      email: 'valid@example.com',
      token: 'valid-ver',
      expiresAt: future,
    });

    await service.savePasswordResetToken({
      userId: 'expired',
      email: 'expired@example.com',
      token: 'expired-reset',
      expiresAt: past,
    });
    await service.savePasswordResetToken({
      userId: 'valid',
      email: 'valid@example.com',
      token: 'valid-reset',
      expiresAt: future,
    });

    const removed = await service.cleanupExpiredTokens();

    expect(removed).toBe(2);
    expect(await service.findVerificationToken('expired-ver')).toBeNull();
    expect(await service.findVerificationToken('valid-ver')).not.toBeNull();
    expect(await service.findPasswordResetToken('expired-reset')).toBeNull();
    expect(await service.findPasswordResetToken('valid-reset')).not.toBeNull();
  });
});

describe('TokenService (CouchDB mode)', () => {
  let service: TokenService;
  let docs: Record<string, any>;
  let revCounter: number;

  beforeEach(() => {
    getDatabaseConfig.mockReturnValue({
      url: 'http://couch.local',
      username: 'admin',
      password: 'secret',
      useMock: false,
    });

    service = new TokenServiceClass();
    docs = {};
    revCounter = 1;

    jest.spyOn(service as any, 'ensureDatabase').mockResolvedValue(undefined);
    (service as any).usingCouch = true;
    (service as any).initialized = true;
    (service as any).couchBaseUrl = 'http://couch.local';
    (service as any).couchAuthHeader = 'Basic test';

    jest
      .spyOn(service as any, 'makeCouchRequest')
      .mockImplementation(async (method: string, path: string, body?: any) => {
        const [resourcePath] = path.split('?');
        const segments = resourcePath.split('/');
        const docId = segments[2];

        if (method === 'GET' && resourcePath === '/auth_tokens/_all_docs') {
          return {
            rows: Object.values(docs).map((doc: any) => ({
              id: doc._id,
              value: {},
              doc,
            })),
          };
        }

        if (method === 'POST' && resourcePath === '/auth_tokens/_find') {
          const selector = body.selector || {};
          const matching = Object.values(docs).filter((doc: any) => {
            return Object.entries(selector).every(
              ([key, value]) => doc[key] === value
            );
          });
          return { docs: matching };
        }

        if (method === 'GET') {
          const doc = docs[docId];
          if (!doc) {
            throw new Error('not found');
          }
          return doc;
        }

        if (method === 'PUT') {
          const newRev = `rev-${revCounter++}`;
          const doc = { ...body, _rev: newRev };
          docs[doc._id] = doc;
          return { id: doc._id, rev: newRev };
        }

        if (method === 'DELETE') {
          if (!docs[docId]) {
            throw new Error('missing');
          }
          delete docs[docId];
          return { ok: true };
        }

        throw new Error(`Unhandled request: ${method} ${path}`);
      });

    jest.spyOn(logger.db, 'error').mockImplementation(() => undefined);
    jest.spyOn(logger.db, 'warn').mockImplementation(() => undefined);
  });

  afterEach(() => {
    jest.restoreAllMocks();
  });

  it('persists and retrieves verification tokens via Couch paths', async () => {
    const expiresAt = new Date('2025-01-02T00:00:00.000Z');
    await service.saveVerificationToken({
      userId: 'user-1',
      email: 'user@example.com',
      token: 'ver-1',
      expiresAt,
    });

    const found = await service.findVerificationToken('ver-1');
    expect(found).not.toBeNull();
    expect(found?.expiresAt).toBeInstanceOf(Date);
    expect(found?.expiresAt.getTime()).toBe(expiresAt.getTime());

    expect(Object.keys(docs)).toContain('ver-ver-1');
  });

  it('deletes verification tokens for a user using Mango query results', async () => {
    const future = new Date(Date.now() + 60_000).toISOString();
    docs['ver-keep'] = {
      _id: 'ver-keep',
      _rev: 'rev-1',
      tokenType: 'verification',
      token: 'keep',
      userId: 'user-keep',
      email: 'keep@example.com',
      expiresAt: future,
      createdAt: future,
    };
    docs['ver-drop'] = {
      _id: 'ver-drop',
      _rev: 'rev-2',
      tokenType: 'verification',
      token: 'drop',
      userId: 'user-drop',
      email: 'drop@example.com',
      expiresAt: future,
      createdAt: future,
    };

    await service.deleteVerificationTokensForUser('user-drop');

    expect(docs['ver-drop']).toBeUndefined();
    expect(docs['ver-keep']).toBeDefined();
  });

  it('handles password reset token lifecycle via Couch calls', async () => {
    const expiresAt = new Date('2025-01-03T00:00:00.000Z');
    await service.savePasswordResetToken({
      userId: 'reset-user',
      email: 'reset@example.com',
      token: 'rst-1',
      expiresAt,
    });

    const found = await service.findPasswordResetToken('rst-1');
    expect(found).not.toBeNull();
    expect(found?.expiresAt.getTime()).toBe(expiresAt.getTime());

    await service.deletePasswordResetToken('rst-1');

    expect(docs['rst-rst-1']).toBeUndefined();
  });

  it('cleans up expired Couch documents and keeps valid ones', async () => {
    const past = new Date(Date.now() - 60_000).toISOString();
    const future = new Date(Date.now() + 60_000).toISOString();

    docs['ver-expired'] = {
      _id: 'ver-expired',
      _rev: 'rev-5',
      tokenType: 'verification',
      token: 'expired',
      userId: 'user-expired',
      email: 'expired@example.com',
      expiresAt: past,
      createdAt: past,
    };
    docs['rst-expired'] = {
      _id: 'rst-expired',
      _rev: 'rev-6',
      tokenType: 'reset',
      token: 'rst-expired',
      userId: 'user-expired',
      email: 'expired@example.com',
      expiresAt: past,
      createdAt: past,
    };
    docs['ver-valid'] = {
      _id: 'ver-valid',
      _rev: 'rev-7',
      tokenType: 'verification',
      token: 'valid',
      userId: 'user-valid',
      email: 'valid@example.com',
      expiresAt: future,
      createdAt: future,
    };

    const removed = await service.cleanupExpiredTokens();

    expect(removed).toBe(2);
    expect(docs['ver-expired']).toBeUndefined();
    expect(docs['rst-expired']).toBeUndefined();
    expect(docs['ver-valid']).toBeDefined();
  });
});