const bcrypt = require('bcryptjs');
const { User, AuditLog } = require('../models');
const { generateToken } = require('../config/auth');
const { AUDIT_ACTIONS } = require('../config/constants');

// Register new user
exports.register = async (req, res) => {
  try {
    const { email, password, fullName, role, phone, region, zone } = req.body;

    // Validate input
    if (!email || !password || !fullName || !role) {
      return res.status(400).json({
        success: false,
        message: 'Email, password, full name, and role are required'
      });
    }

    // Check if user already exists
    const existingUser = await User.findOne({ where: { email } });
    if (existingUser) {
      return res.status(400).json({
        success: false,
        message: 'User with this email already exists'
      });
    }

    // Hash password
    const hashedPassword = await bcrypt.hash(password, 10);

    // Insert user
    const user = await User.create({
      email,
      password: hashedPassword,
      name: fullName,
      role,
      phone,
      region,
      zone
    });

    // Log audit
    await AuditLog.create({
      userId: user.id,
      action: AUDIT_ACTIONS.CREATED,
      entityType: 'user',
      entityId: user.id
    });

    res.status(201).json({
      success: true,
      message: 'User registered successfully',
      userId: user.id
    });
  } catch (error) {
    console.error('Register error:', error);
    res.status(500).json({
      success: false,
      message: 'Error registering user'
    });
  }
};

// Login
exports.login = async (req, res) => {
  try {
    const { email, password } = req.body;

    // Validate input
    if (!email || !password) {
      return res.status(400).json({
        success: false,
        message: 'Email and password are required'
      });
    }

    // Get user
    const user = await User.findOne({ where: { email } });

    if (!user) {
      return res.status(401).json({
        success: false,
        message: 'Invalid email or password'
      });
    }

    // Check if account is active
    if (user.status !== 'active') {
      return res.status(403).json({
        success: false,
        message: 'Account is deactivated'
      });
    }

    // Verify password
    const isValidPassword = await bcrypt.compare(password, user.password);
    if (!isValidPassword) {
      return res.status(401).json({
        success: false,
        message: 'Invalid email or password'
      });
    }

    // Update last login
    await user.update({ lastLogin: new Date() });

    // Generate token
    const token = generateToken(user);

    // Log audit
    await AuditLog.create({
      userId: user.id,
      action: 'user_login',
      entityType: 'user',
      entityId: user.id
    });

    res.json({
      success: true,
      token,
      user: {
        id: user.id,
        email: user.email,
        fullName: user.name,
        role: user.role,
        region: user.region,
        zone: user.zone
      }
    });
  } catch (error) {
    console.error('Login error:', error);
    res.status(500).json({
      success: false,
      message: 'Error during login'
    });
  }
};

// Get profile
exports.getProfile = async (req, res) => {
  try {
    const user = await User.findByPk(req.user.id, {
      attributes: ['id', 'email', 'name', 'role', 'region', 'zone', 'phone', 'createdAt']
    });

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

    res.json({
      success: true,
      user: {
        id: user.id,
        email: user.email,
        fullName: user.name,
        role: user.role,
        region: user.region,
        zone: user.zone,
        phone: user.phone,
        createdAt: user.createdAt
      }
    });
  } catch (error) {
    console.error('Get profile error:', error);
    res.status(500).json({
      success: false,
      message: 'Error fetching profile'
    });
  }
};

// Update profile
exports.updateProfile = async (req, res) => {
  try {
    const { fullName, phone } = req.body;

    const user = await User.findByPk(req.user.id);
    if (!user) {
      return res.status(404).json({
        success: false,
        message: 'User not found'
      });
    }

    await user.update({
      name: fullName || user.name,
      phone: phone || user.phone
    });

    // Log audit
    await AuditLog.create({
      userId: req.user.id,
      action: AUDIT_ACTIONS.UPDATED,
      entityType: 'user',
      entityId: req.user.id
    });

    res.json({
      success: true,
      message: 'Profile updated successfully'
    });
  } catch (error) {
    console.error('Update profile error:', error);
    res.status(500).json({
      success: false,
      message: 'Error updating profile'
    });
  }
};

// Change password
exports.changePassword = async (req, res) => {
  try {
    const { currentPassword, newPassword } = req.body;

    if (!currentPassword || !newPassword) {
      return res.status(400).json({
        success: false,
        message: 'Current password and new password are required'
      });
    }

    // Get current user
    const user = await User.findByPk(req.user.id);
    if (!user) {
      return res.status(404).json({
        success: false,
        message: 'User not found'
      });
    }

    // Verify current password
    const isValid = await bcrypt.compare(currentPassword, user.password);
    if (!isValid) {
      return res.status(401).json({
        success: false,
        message: 'Current password is incorrect'
      });
    }

    // Hash new password
    const hashedPassword = await bcrypt.hash(newPassword, 10);

    // Update password
    await user.update({ password: hashedPassword });

    // Log audit
    await AuditLog.create({
      userId: req.user.id,
      action: 'password_changed',
      entityType: 'user',
      entityId: req.user.id
    });

    res.json({
      success: true,
      message: 'Password changed successfully'
    });
  } catch (error) {
    console.error('Change password error:', error);
    res.status(500).json({
      success: false,
      message: 'Error changing password'
    });
  }
};