import express, { Request, Response } from 'express';
import { User, ApiResponse } from '../types';

const router = express.Router();

// Sample data
let users: User[] = [
  { id: 1, name: 'John Doe', email: 'john@example.com' },
  { id: 2, name: 'Jane Smith', email: 'jane@example.com' }
];

// GET /api/users - Get all users
router.get('/users', (req: Request, res: Response<ApiResponse<User[]>>) => {
  res.json({
    success: true,
    data: users,
    count: users.length
  });
});

// GET /api/users/:id - Get user by ID
router.get('/users/:id', (req: Request, res: Response<ApiResponse<User>>) => {
  const id = parseInt(req.params.id);
  const user = users.find(u => u.id === id);
  
  if (!user) {
    return res.status(404).json({
      success: false,
      error: 'User not found'
    });
  }
  
  res.json({
    success: true,
    data: user
  });
});

// POST /api/users - Create new user
router.post('/users', (req: Request, res: Response<ApiResponse<User>>) => {
  const { name, email }: { name?: string; email?: string } = req.body;
  
  if (!name || !email) {
    return res.status(400).json({
      success: false,
      error: 'Name and email are required'
    });
  }
  
  const newUser: User = {
    id: users.length + 1,
    name,
    email
  };
  
  users.push(newUser);
  
  res.status(201).json({
    success: true,
    data: newUser,
    message: 'User created successfully'
  });
});

// PUT /api/users/:id - Update user
router.put('/users/:id', (req: Request, res: Response<ApiResponse<User>>) => {
  const id = parseInt(req.params.id);
  const userIndex = users.findIndex(u => u.id === id);
  
  if (userIndex === -1) {
    return res.status(404).json({
      success: false,
      error: 'User not found'
    });
  }
  
  const { name, email }: { name?: string; email?: string } = req.body;
  
  if (!name || !email) {
    return res.status(400).json({
      success: false,
      error: 'Name and email are required'
    });
  }
  
  users[userIndex] = { ...users[userIndex], name, email };
  
  res.json({
    success: true,
    data: users[userIndex],
    message: 'User updated successfully'
  });
});

// DELETE /api/users/:id - Delete user
router.delete('/users/:id', (req: Request, res: Response<ApiResponse<User>>) => {
  const id = parseInt(req.params.id);
  const userIndex = users.findIndex(u => u.id === id);
  
  if (userIndex === -1) {
    return res.status(404).json({
      success: false,
      error: 'User not found'
    });
  }
  
  const deletedUser = users.splice(userIndex, 1)[0];
  
  res.json({
    success: true,
    data: deletedUser,
    message: 'User deleted successfully'
  });
});

export default router;