'use client';

import { useState, useEffect, useRef, useCallback } from 'react';
import Link from 'next/link';
import Image from 'next/image';

import { useSession } from 'next-auth/react';
import { agentsService } from '@/services/agents.service';
import { usersService } from '@/services/users.service';
import { uploadService } from '@/services/upload.service';
import { notificationsApiService } from '@/services/notifications-api.service';

const navLinks = [
  { label: 'Education', href: '/education' },
  { label: 'About Us', href: '/about' },
  { label: "FAQ's", href: '/faq' },
];

export function CommonHeader() {
  const { data: session } = useSession();
  const [showProfileMenu, setShowProfileMenu] = useState(false);
  const profileMenuRef = useRef<HTMLDivElement>(null);
  const [profileImage, setProfileImage] = useState<string | null>(null);
  const [profileName, setProfileName] = useState<string | null>(null);
  const [notificationCount, setNotificationCount] = useState(0);

  // Close dropdown when clicking outside
  useEffect(() => {
    function handleClickOutside(event: MouseEvent) {
      if (profileMenuRef.current && !profileMenuRef.current.contains(event.target as Node)) {
        setShowProfileMenu(false);
      }
    }

    if (showProfileMenu) {
      document.addEventListener('mousedown', handleClickOutside);
    }

    return () => {
      document.removeEventListener('mousedown', handleClickOutside);
    };
  }, [showProfileMenu]);

  // Fetch profile data (image and name) from backend based on user role
  const fetchProfileData = useCallback(async () => {
    try {
      const role = (session?.user as any)?.role;
      let avatar: string | null = null;
      let name: string | null = null;

      if (role === 'AGENT') {
        const profile = await agentsService.getMyProfile();
        avatar = profile.avatar;
        name = profile.firstName ? `${profile.firstName} ${profile.lastName || ''}`.trim() : null;
      } else if (role === 'USER') {
        const profile = await usersService.getMyProfile();
        avatar = profile.avatar;
        name = profile.firstName ? `${profile.firstName} ${profile.lastName || ''}`.trim() : null;
      }

      if (name) {
        setProfileName(name);
      }

      if (avatar) {
        try {
          const avatarUrl = await uploadService.getPresignedDownloadUrl(avatar);
          setProfileImage(avatarUrl);
        } catch {
          setProfileImage(avatar);
        }
      }
    } catch (err) {
      console.error('Failed to fetch profile data:', err);
    }
  }, [session]);

  useEffect(() => {
    if (session) {
      fetchProfileData();
    }
  }, [session, fetchProfileData]);

  // Fetch notification unread count
  const fetchUnreadCount = useCallback(async () => {
    try {
      const count = await notificationsApiService.getUnreadCount();
      setNotificationCount(count);
    } catch {
      // Silently fail - user may not be authenticated yet
    }
  }, []);

  useEffect(() => {
    if (session) {
      fetchUnreadCount();
      // Poll every 30 seconds for new notifications
      const interval = setInterval(fetchUnreadCount, 30000);
      // Also refresh when a foreground notification arrives
      const handleNotification = () => fetchUnreadCount();
      window.addEventListener('notification-received', handleNotification);
      return () => {
        clearInterval(interval);
        window.removeEventListener('notification-received', handleNotification);
      };
    }
  }, [session, fetchUnreadCount]);

  // Listen for profile update events to refresh the header
  useEffect(() => {
    const handleProfileUpdate = () => {
      if (session) {
        fetchProfileData();
      }
    };

    window.addEventListener('profile-updated', handleProfileUpdate);
    return () => {
      window.removeEventListener('profile-updated', handleProfileUpdate);
    };
  }, [session, fetchProfileData]);

  // Use fetched profile name, fallback to session name
  const userName = profileName || session?.user?.name;
  const userEmail = session?.user?.email;
  const userRole = (session?.user as any)?.role;
  // Use fetched profile image, fallback to session image
  const userImage = profileImage || session?.user?.image;

  // Determine dashboard link based on user role
  const dashboardLink = userRole === 'AGENT' ? '/agent/dashboard' : '/user/dashboard';

  return (
    <header className="bg-[#648188] rounded-[20px] px-8">
      <div className="flex justify-between items-center h-[70px]">
        {/* Logo */}
        <Link href={dashboardLink}>
          <Image
            src="/assets/logo.svg"
            alt="RE-QuestN"
            width={150}
            height={40}
            className="h-10 w-auto"
          />
        </Link>

        {/* Navigation */}
        <nav className="hidden md:flex items-center gap-8 ml-auto mr-8">
          {navLinks.map((link) => (
            <Link
              key={link.href}
              href={link.href}
              className="font-fractul font-bold text-[14px] leading-[18px] text-[#00293D] hover:text-[#e58625] transition-colors"
            >
              {link.label}
            </Link>
          ))}
        </nav>

        {/* Right Side Icons */}
        <div className="flex items-center gap-4">
          {session ? (
            <>
              {/* Notification Bell */}
              <Link
                href={userRole === 'AGENT' ? '/agent/notifications' : '/user/notifications'}
                className="relative w-6 h-6 flex items-center justify-center hover:opacity-80 transition-opacity cursor-pointer"
              >
                <Image
                  src="/assets/notification-icon.svg"
                  alt="Notifications"
                  width={20}
                  height={22}
                />
                {/* Notification Badge */}
                {notificationCount > 0 && (
                  <span className="absolute -top-1.5 -right-2 min-w-[18px] h-[18px] bg-red-500 rounded-full flex items-center justify-center px-1">
                    <span className="text-white text-[10px] font-bold leading-none">
                      {notificationCount > 99 ? '99+' : notificationCount}
                    </span>
                  </span>
                )}
              </Link>

              {/* Profile Section with Greeting - Entire area clickable */}
              <div className="relative" ref={profileMenuRef}>
                <button
                  onClick={() => setShowProfileMenu(!showProfileMenu)}
                  className="flex items-center gap-3 hover:opacity-80 transition-opacity cursor-pointer"
                >
                  {/* Avatar */}
                  <div className="w-[35px] h-[35px] rounded-full overflow-hidden border-2 border-[#e58625] bg-gray-100">
                    {userImage ? (
                      <img
                        src={userImage}
                        alt="Profile"
                        className="w-full h-full object-cover"
                      />
                    ) : (
                      <Image
                        src="/assets/icons/user-placeholder-icon.svg"
                        alt="Profile"
                        width={35}
                        height={35}
                        className="object-cover"
                        style={{ width: '100%', height: '100%' }}
                      />
                    )}
                  </div>
                  {/* Greeting Text */}
                  <div className="flex flex-col text-left">
                    <span className="font-bold text-[14px] text-[#e58625] leading-tight">
                      Hi {userName?.split(' ')[0] || 'User'} !
                    </span>
                    <span className="font-bold text-[9px] text-[#00293d] leading-tight">
                      Welcome back !
                    </span>
                  </div>
                </button>

                {/* Profile Dropdown Menu */}
                {showProfileMenu && (
                  <div className="absolute right-0 top-full mt-3 w-[271px] bg-white rounded-[15px] border border-black/20 z-50 shadow-[0px_4px_4px_0px_rgba(0,0,0,0.25)]">
                    {/* Arrow/Triangle at top */}
                    <div className="absolute -top-2 right-6 w-0 h-0 border-l-[8px] border-l-transparent border-r-[8px] border-r-transparent border-b-[8px] border-b-white"></div>

                    {/* User Profile Section */}
                    <div className="flex items-center gap-3 px-4 py-4 border-b border-black/10">
                      <div className="w-[42px] h-[42px] rounded-full overflow-hidden flex-shrink-0 bg-gray-100">
                        {userImage ? (
                          <img
                            src={userImage}
                            alt="Profile"
                            className="w-full h-full object-cover"
                          />
                        ) : (
                          <Image
                            src="/assets/icons/user-placeholder-icon.svg"
                            alt="Profile"
                            width={42}
                            height={42}
                            className="object-cover"
                            style={{ width: '100%', height: '100%' }}
                          />
                        )}
                      </div>
                      <div className="flex flex-col min-w-0 overflow-hidden">
                        <p className="font-fractul font-medium text-[16px] leading-[20px] text-black">
                          {userName?.split(' ')[0] || 'User'}
                        </p>
                        <p className="font-serif text-[14px] leading-[18px] text-black/50 truncate">
                          {userEmail}
                        </p>
                      </div>
                    </div>

                    {/* Account Settings */}
                    <Link
                      href={userRole === 'AGENT' ? '/agent/settings' : '/user/settings'}
                      className="flex items-center gap-3 px-4 py-3 border-b border-black/10 hover:bg-black/5 transition-colors"
                      onClick={() => setShowProfileMenu(false)}
                    >
                      <Image
                        src="/assets/icons/settings-icon.svg"
                        alt="Settings"
                        width={24}
                        height={24}
                      />
                      <div className="flex flex-col">
                        <p className="font-fractul text-[16px] leading-[18px] text-black">
                          Account Settings
                        </p>
                        <p className="font-serif text-[14px] leading-[18px] text-black/50">
                          Profile, Security
                        </p>
                      </div>
                    </Link>

                    {/* Notification Settings */}
                    <Link
                      href={userRole === 'AGENT' ? '/agent/settings/notifications' : '/user/settings/notifications'}
                      className="flex items-center gap-3 px-4 py-3 border-b border-black/10 hover:bg-black/5 transition-colors"
                      onClick={() => setShowProfileMenu(false)}
                    >
                      <Image
                        src="/assets/icons/notification-settings-icon.svg"
                        alt="Notifications"
                        width={24}
                        height={24}
                      />
                      <p className="font-fractul text-[16px] leading-[18px] text-black">
                        Notification Settings
                      </p>
                    </Link>

                    {/* Log Out */}
                    <button
                      onClick={() => {
                        setShowProfileMenu(false);
                        localStorage.removeItem('accessToken');
                        localStorage.removeItem('refreshToken');
                        localStorage.removeItem('user');
                        window.location.href = '/logout';
                      }}
                      className="w-full flex items-center gap-3 px-4 py-3 hover:bg-black/5 transition-colors"
                    >
                      <Image
                        src="/assets/icons/logout-icon.svg"
                        alt="Log Out"
                        width={24}
                        height={24}
                      />
                      <p className="font-fractul font-bold text-[16px] leading-[18px] text-[#e58625]">
                        Log Out
                      </p>
                    </button>
                  </div>
                )}
              </div>
            </>
          ) : (
            <div className="flex items-center gap-3">
              <Link
                href="/login"
                className="font-fractul font-bold text-[14px] text-[#00293D] hover:text-[#e58625] transition-colors"
              >
                Login
              </Link>
              <Link
                href="/signup"
                className="bg-[#e58625] text-[#00293D] px-4 py-2 rounded-[15px] font-fractul font-bold text-[14px] hover:bg-[#d47720] transition-colors"
              >
                Sign Up
              </Link>
            </div>
          )}

          {/* Mobile Menu Button */}
          <button className="md:hidden p-2 hover:opacity-80 transition-opacity">
            <svg
              className="w-6 h-6 text-[#00293d]"
              fill="none"
              stroke="currentColor"
              viewBox="0 0 24 24"
            >
              <path
                strokeLinecap="round"
                strokeLinejoin="round"
                strokeWidth={2}
                d="M4 6h16M4 12h16M4 18h16"
              />
            </svg>
          </button>
        </div>
      </div>
    </header>
  );
}
