import SiteConfig from "../models/SiteConfig.js";
import { verifyAccessToken } from "../utils/jwt.js";
import User from "../models/User.js";

/**
 * Middleware to check if site is in maintenance mode
 * Allows admins and whitelisted users to access during maintenance
 */
export const checkMaintenance = async (request, reply) => {
  try {
    const currentPath = request.url.split("?")[0]; // Remove query params

    // Skip maintenance check for public health endpoints and auth routes
    const publicEndpoints = [
      "/health",
      "/api/health",
      "/api/config/public",
      "/api/config/announcements",
      "/api/config/status",
      "/api/config/promotions",
    ];

    // Allow all auth routes (needed for Steam OAuth flow)
    const authRoutes = [
      "/auth/steam",
      "/auth/steam/return",
      "/api/auth/steam",
      "/api/auth/steam/return",
      "/api/auth/me",
      "/api/auth/verify",
      "/api/auth/refresh",
      "/api/auth/logout",
    ];

    if (
      publicEndpoints.includes(currentPath) ||
      authRoutes.includes(currentPath) ||
      currentPath.startsWith("/auth/") ||
      currentPath.startsWith("/api/auth/")
    ) {
      return;
    }

    const config = await SiteConfig.getConfig();

    // If maintenance mode is not enabled, allow all requests
    if (!config.isMaintenanceActive()) {
      return;
    }

    // Try to verify user authentication manually if not already done
    let authenticatedUser = request.user;

    if (!authenticatedUser) {
      // Try to get token from cookies or Authorization header
      let token = null;

      // Check Authorization header
      const authHeader = request.headers.authorization;
      if (authHeader && authHeader.startsWith("Bearer ")) {
        token = authHeader.substring(7);
      }

      // Check cookies if no header
      if (!token && request.cookies && request.cookies.accessToken) {
        token = request.cookies.accessToken;
      }

      // If we have a token, verify it
      if (token) {
        try {
          const decoded = verifyAccessToken(token);
          if (decoded && decoded.userId) {
            // Fetch user from database
            authenticatedUser = await User.findById(decoded.userId);
          }
        } catch (error) {
          // Token invalid or expired - user will be treated as unauthenticated
          console.log(
            "⚠️ Token verification failed in maintenance check:",
            error.message
          );
        }
      }
    }

    // If user is authenticated, check if they're allowed during maintenance
    if (authenticatedUser) {
      // Check if user is admin (staff level 3+)
      if (authenticatedUser.staffLevel >= 3) {
        console.log(
          `✅ Admin ${authenticatedUser.username} bypassing maintenance mode for ${currentPath}`
        );
        return; // Allow all admin access
      }

      // Check if user's steamId is in the allowed list
      if (config.canAccessDuringMaintenance(authenticatedUser.steamId)) {
        console.log(
          `✅ Whitelisted user ${authenticatedUser.username} bypassing maintenance mode`
        );
        return;
      }
    }

    // User is not allowed during maintenance
    console.log(`⚠️ Blocking request during maintenance: ${currentPath}`);

    // For API calls, return JSON
    if (currentPath.startsWith("/api/")) {
      return reply.status(503).send({
        success: false,
        maintenance: true,
        message:
          config.maintenance.message ||
          "We're currently performing maintenance. Please check back soon!",
        scheduledEnd: config.maintenance.scheduledEnd,
        redirectTo: "/maintenance",
      });
    }

    // For regular page requests, redirect to maintenance page
    // (This will be handled by frontend router)
    return reply.status(503).send({
      success: false,
      maintenance: true,
      message:
        config.maintenance.message ||
        "We're currently performing maintenance. Please check back soon!",
      scheduledEnd: config.maintenance.scheduledEnd,
      redirectTo: "/maintenance",
    });
  } catch (error) {
    console.error("❌ Maintenance check error:", error);
    // On error, allow the request to proceed (fail open)
    return;
  }
};

/**
 * Optional middleware - only check maintenance for specific routes
 */
export const maintenanceExempt = async (request, reply) => {
  // This middleware does nothing - it's used to mark routes that should bypass maintenance
  return;
};