const jwt = require('jsonwebtoken');
const { User, Tenant } = require('../models');

async function authenticateToken(req, res, next) {
  const authHeader = req.headers['authorization'];
  const token = authHeader && authHeader.split(' ')[1];

  if (!token) {
    return res.status(401).json({
      success: false,
      message: 'Access token required'
    });
  }

  try {
    const decoded = jwt.verify(token, process.env.JWT_SECRET);
    
    // Log what's in the token for debugging
    console.log('🔍 JWT Token decoded:', {
      userId: decoded.userId,
      username: decoded.username,
      role: decoded.role,
      tenantId: decoded.tenantId,
      provider: decoded.provider
    });
    
    // For older tokens without tenantId, we need to look up the user's tenant
    let tenantId = decoded.tenantId;
    
    const user = await User.findByPk(decoded.userId, {
      attributes: ['id', 'username', 'email', 'role', 'is_active', 'tenant_id'],
      include: [{
        model: Tenant,
        as: 'tenant',
        attributes: ['slug', 'name']
      }]
    });

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

    req.user = user;
    
    // Set tenant context - prefer JWT tenantId, fallback to user's tenant
    if (tenantId) {
      req.tenantId = tenantId;
      console.log('✅ Tenant context from JWT:', tenantId);
    } else if (user.tenant && user.tenant.slug) {
      req.tenantId = user.tenant.slug;
      console.log('✅ Tenant context from user record:', user.tenant.slug);
    } else {
      console.log('⚠️ No tenant context available');
    }
    
    next();
  } catch (error) {
    console.error('Token verification error:', error);
    return res.status(403).json({
      success: false,
      message: 'Invalid or expired token'
    });
  }
}

function requireRole(roles) {
  return (req, res, next) => {
    if (!req.user) {
      return res.status(401).json({
        success: false,
        message: 'Authentication required'
      });
    }

    const userRoles = Array.isArray(roles) ? roles : [roles];
    if (!userRoles.includes(req.user.role)) {
      return res.status(403).json({
        success: false,
        message: 'Insufficient permissions'
      });
    }

    next();
  };
}

module.exports = {
  authenticateToken,
  requireRole
};