'use strict';

/**
 * Admin Auth Controller Unit Tests
 * Tests for admin authentication endpoints
 */

const bcrypt = require('bcryptjs');
const jwt = require('jsonwebtoken');

process.env.ADMIN_JWT_SECRET = 'test-secret-for-unit-tests';

// Mock dependencies before requiring the controller
const mockPool = {
  query: jest.fn(),
  connect: jest.fn(() => ({
    query: jest.fn(),
    release: jest.fn()
  }))
};

jest.mock('../db', () => ({
  getPool: jest.fn(() => mockPool)
}));

const authController = require('../controllers/auth.controller');
const { getPool } = require('../db');

describe('Admin Auth Controller', () => {
  let mockReq;
  let mockRes;
  let mockPool;

  beforeEach(() => {
    mockReq = {
      body: {},
      user: {}
    };
    mockRes = {
      status: jest.fn().mockReturnThis(),
      json: jest.fn().mockReturnThis()
    };
    mockPool = getPool();
    jest.clearAllMocks();
  });

  describe('register', () => {
    it('should register a new admin successfully', async () => {
      mockReq.body = {
        username: 'admin1',
        email: 'admin@example.com',
        password: 'SecurePass123!',
        name: 'Admin User'
      };

      // No existing admin
      mockPool.query.mockResolvedValueOnce({ rows: [] });
      
      // Insert returns new admin
      const newAdmin = {
        id: 'admin-id-1',
        username: 'admin1',
        email: 'admin@example.com',
        name: 'Admin User',
        permissions: ['all']
      };
      mockPool.query.mockResolvedValueOnce({ rows: [newAdmin] });

      await authController.register(mockReq, mockRes);

      expect(mockRes.status).toHaveBeenCalledWith(201);
      expect(mockRes.json).toHaveBeenCalledWith(
        expect.objectContaining({
          admin: expect.objectContaining({
            email: 'admin@example.com',
            username: 'admin1'
          }),
          tokens: expect.objectContaining({
            accessToken: expect.any(String),
            refreshToken: expect.any(String)
          })
        })
      );
    });

    it('should return 400 if admin already exists by email', async () => {
      mockReq.body = {
        username: 'newadmin',
        email: 'existing@example.com',
        password: 'pass123',
        name: 'New Admin'
      };

      mockPool.query.mockResolvedValueOnce({ rows: [{ id: 'existing-id' }] });

      await authController.register(mockReq, mockRes);

      expect(mockRes.status).toHaveBeenCalledWith(400);
      expect(mockRes.json).toHaveBeenCalledWith({ error: 'Admin already exists' });
    });

    it('should return 400 if admin already exists by username', async () => {
      mockReq.body = {
        username: 'existingadmin',
        email: 'new@example.com',
        password: 'pass123',
        name: 'New Admin'
      };

      mockPool.query.mockResolvedValueOnce({ rows: [{ id: 'existing-id' }] });

      await authController.register(mockReq, mockRes);

      expect(mockRes.status).toHaveBeenCalledWith(400);
      expect(mockRes.json).toHaveBeenCalledWith({ error: 'Admin already exists' });
    });

    it('should return 500 if database is not connected', async () => {
      mockReq.body = { username: 'admin', email: 'a@b.com', password: 'pass', name: 'Admin' };
      require('../db').getPool.mockReturnValueOnce(null);

      await authController.register(mockReq, mockRes);

      expect(mockRes.status).toHaveBeenCalledWith(500);
      expect(mockRes.json).toHaveBeenCalledWith({ error: 'Database not connected' });
    });

    it('should return 500 on database error', async () => {
      mockReq.body = { username: 'admin', email: 'a@b.com', password: 'pass', name: 'Admin' };
      mockPool.query.mockRejectedValueOnce(new Error('DB error'));

      await authController.register(mockReq, mockRes);

      expect(mockRes.status).toHaveBeenCalledWith(500);
      expect(mockRes.json).toHaveBeenCalledWith({ error: 'Failed to register admin' });
    });
  });

  describe('login', () => {
    it('should login admin with valid credentials', async () => {
      const password = 'SecurePass123!';
      const hashedPassword = await bcrypt.hash(password, 12);

      mockReq.body = {
        email: 'admin@example.com',
        password: password
      };

      const admin = {
        id: 'admin-id-1',
        username: 'admin1',
        email: 'admin@example.com',
        password_hash: hashedPassword,
        name: 'Admin User',
        permissions: ['all']
      };
      mockPool.query.mockResolvedValueOnce({ rows: [admin] });

      await authController.login(mockReq, mockRes);

      expect(mockRes.json).toHaveBeenCalledWith(
        expect.objectContaining({
          admin: expect.objectContaining({
            email: 'admin@example.com'
          }),
          tokens: expect.objectContaining({
            accessToken: expect.any(String),
            refreshToken: expect.any(String)
          })
        })
      );
      // Password hash should be removed from response
      expect(mockRes.json.mock.calls[0][0].admin.password_hash).toBeUndefined();
    });

    it('should return 401 if admin not found', async () => {
      mockReq.body = {
        email: 'nonexistent@example.com',
        password: 'password123'
      };

      mockPool.query.mockResolvedValueOnce({ rows: [] });

      await authController.login(mockReq, mockRes);

      expect(mockRes.status).toHaveBeenCalledWith(401);
      expect(mockRes.json).toHaveBeenCalledWith({ error: 'Invalid credentials' });
    });

    it('should return 401 for invalid password', async () => {
      mockReq.body = {
        email: 'admin@example.com',
        password: 'wrongpassword'
      };

      const admin = {
        id: 'admin-id-1',
        email: 'admin@example.com',
        password_hash: await bcrypt.hash('correctpassword', 12)
      };
      mockPool.query.mockResolvedValueOnce({ rows: [admin] });

      await authController.login(mockReq, mockRes);

      expect(mockRes.status).toHaveBeenCalledWith(401);
      expect(mockRes.json).toHaveBeenCalledWith({ error: 'Invalid credentials' });
    });

    it('should return 500 if database is not connected', async () => {
      mockReq.body = { email: 'admin@example.com', password: 'pass' };
      require('../db').getPool.mockReturnValueOnce(null);

      await authController.login(mockReq, mockRes);

      expect(mockRes.status).toHaveBeenCalledWith(500);
      expect(mockRes.json).toHaveBeenCalledWith({ error: 'Database not connected' });
    });

    it('should return 500 on database error', async () => {
      mockReq.body = { email: 'admin@example.com', password: 'pass' };
      mockPool.query.mockRejectedValueOnce(new Error('DB error'));

      await authController.login(mockReq, mockRes);

      expect(mockRes.status).toHaveBeenCalledWith(500);
      expect(mockRes.json).toHaveBeenCalledWith({ error: 'Login failed' });
    });
  });

  describe('getMe', () => {
    it('should return current admin profile', async () => {
      mockReq.user = { id: 'admin-id-1' };

      const admin = {
        id: 'admin-id-1',
        username: 'admin1',
        email: 'admin@example.com',
        name: 'Admin User',
        permissions: ['all']
      };
      mockPool.query.mockResolvedValueOnce({ rows: [admin] });

      await authController.getMe(mockReq, mockRes);

      expect(mockRes.json).toHaveBeenCalledWith({ admin });
    });

    it('should return 404 if admin not found', async () => {
      mockReq.user = { id: 'nonexistent-id' };
      mockPool.query.mockResolvedValueOnce({ rows: [] });

      await authController.getMe(mockReq, mockRes);

      expect(mockRes.status).toHaveBeenCalledWith(404);
      expect(mockRes.json).toHaveBeenCalledWith({ error: 'Admin not found' });
    });

    it('should return 500 on database error', async () => {
      mockReq.user = { id: 'admin-id-1' };
      mockPool.query.mockRejectedValueOnce(new Error('DB error'));

      await authController.getMe(mockReq, mockRes);

      expect(mockRes.status).toHaveBeenCalledWith(500);
      expect(mockRes.json).toHaveBeenCalledWith({ error: 'Failed to fetch profile' });
    });
  });
});