const User = require('../models/User');

exports.createUser = async (req, res) => {
  try {
    const { name, phone } = req.body;

    if (!name || !phone) {
      return res.status(400).json({ success: false, message: 'Name and phone are required' });
    }

    // Generate a random 4 digit OTP
    const generatedOtp = Math.floor(1000 + Math.random() * 9000).toString();
    const otpExpiry = new Date(Date.now() + 10 * 60 * 1000); // 10 minutes from now

    let user = await User.findOne({ phone });
    let isExisting = false;

    if (user) {
      isExisting = true;
      user.otp = generatedOtp;
      user.otpExpiry = otpExpiry;
      user.name = name; // Update name just in case
      await user.save();
    } else {
      user = await User.create({
        name,
        phone,
        otp: generatedOtp,
        otpExpiry
      });
    }

    res.json({
      success: true,
      user: {
        otp: user.otp,
        isExisting
      }
    });
  } catch (error) {
    console.error('Error creating user:', error);
    res.status(500).json({ success: false, message: 'Server error' });
  }
};

exports.verifyOtp = async (req, res) => {
  try {
    const { phone, otp } = req.body;

    if (!phone || !otp) {
      return res.status(400).json({ success: false, message: 'Phone and OTP required' });
    }

    const user = await User.findOne({ phone });

    if (!user) {
      return res.status(404).json({ success: false, message: 'User not found' });
    }

    if (user.otp !== otp) {
      return res.status(400).json({ success: false, message: 'Invalid OTP' });
    }

    if (user.otpExpiry < new Date()) {
      return res.status(400).json({ success: false, message: 'OTP expired' });
    }

    // Clear OTP after successful verification
    user.otp = null;
    user.otpExpiry = null;
    await user.save();

    res.json({ success: true, message: 'OTP verified successfully' });
  } catch (error) {
    console.error('Error verifying OTP:', error);
    res.status(500).json({ success: false, message: 'Server error' });
  }
};