const jwt = require('jsonwebtoken');
const { logger } = require('./logger');

function authMiddleware(req, res, next) {
  const authHeader = req.headers.authorization;
  if (!authHeader || !authHeader.startsWith('Bearer ')) {
    logger.warn('authMiddleware:missingToken', {
      method: req.method,
      route: req.originalUrl
    });
    return res.status(401).json({ success: false, message: 'No access token provided' });
  }

  const token = authHeader.split(' ')[1];
  try {
    const payload = jwt.verify(token, process.env.JWT_SECRET);

    // edit profile context awareness
    const isEditProfile =
      req.originalUrl?.includes('/profile/personal') ||
      req.baseUrl?.includes('/profile/personal');

    // derive and log user type data
    const derivedUserType = payload.userType ?? payload.user_type ?? payload.type;
    const authDebug = {
      context: isEditProfile ? 'edit-profile' : 'general',
      method: req.method,
      route: req.originalUrl,
      id: payload.id ?? payload.userId ?? payload.sub,
      email: payload.email,
      userType: payload.userType,
      user_type: payload.user_type,
      derivedUserType,
      payloadKeys: Object.keys(payload || {})
    };
    logger.info(`authMiddleware:verified context=${authDebug.context} userType=${authDebug.derivedUserType}`, authDebug);
    // console fallback for local dev
    console.log('[authMiddleware] verified', authDebug);

    // Normalize common user fields for downstream checks
    const normalizedUserId = payload.userId ?? payload.id ?? payload.sub;
    const normalizedRole = payload.role ?? payload.userRole ?? payload.user_role ?? payload.type;

    // Attach user info to request (with normalized userType for downstream checks)
    req.user = {
      ...payload,
      userId: normalizedUserId,
      role: normalizedRole ?? payload.role,
      userType: payload.userType ?? payload.user_type,
      user_type: payload.user_type ?? payload.userType
    };

    next();
  } catch (error) {
    logger.warn('authMiddleware:tokenInvalid', {
      method: req.method,
      route: req.originalUrl,
      reason: error?.message
    });
    return res.status(401).json({ success: false, message: 'Invalid or expired access token' });
  }
}

module.exports = authMiddleware;