import { useState } from 'react';
import { Link, useLocation, useNavigate } from 'react-router-dom';
import { Menu, X, LayoutDashboard, Users, MessageSquare, Home, LogIn, LogOut } from 'lucide-react';
import { cn } from '@/lib/utils';
import { useAuth } from '@/contexts/AuthContext';

export default function Navigation() {
  const [mobileMenuOpen, setMobileMenuOpen] = useState(false);
  const location = useLocation();
  const navigate = useNavigate();
  const { isAuthenticated, logout } = useAuth();
  
  const navigationItems = [
    {
      name: 'Home',
      href: '/',
      icon: Home,
    },
    {
      name: 'Synthetic Personas',
      href: '/synthetic-users',
      icon: Users,
    },
    {
      name: 'Focus Groups',
      href: '/focus-groups',
      icon: MessageSquare,
    },
    {
      name: 'Dashboard',
      href: '/dashboard',
      icon: LayoutDashboard,
    },
  ];

  const toggleMobileMenu = () => {
    setMobileMenuOpen(!mobileMenuOpen);
  };

  const isActive = (path: string) => {
    return location.pathname === path;
  };
  
  // Handle navigation with authentication
  const handleAuthNavigation = (path: string) => {
    // Dispatch a custom event when navigating to the synthetic users page
    // This helps components know when they should refresh data
    if (path === '/synthetic-users') {
      // Create and dispatch a custom event that the SyntheticUsers component can listen for
      const event = new CustomEvent('syntheticUsersNavigation');
      window.dispatchEvent(event);
    }
    
    // Always navigate normally - ProtectedRoute will handle auth check
    navigate(path);
  };

  return (
    <header className="fixed top-0 left-0 right-0 z-50 bg-white/80 backdrop-blur-md border-b border-slate-200/80">
      <div className="px-4 sm:px-6 lg:px-8">
        <div className="flex h-16 items-center justify-between">
          <div className="flex items-center">
            <Link to="/" className="flex items-center">
              <span className="font-sf text-2xl font-semibold text-gradient">Semblance</span>
            </Link>
          </div>
          
          {/* Desktop Navigation */}
          <nav className="hidden md:block">
            <ul className="flex items-center space-x-8">
              {navigationItems.map((item) => (
                <li key={item.name}>
                  {item.href === '/' ? (
                    <Link
                      to={item.href}
                      className={cn(
                        "flex items-center px-1 py-2 text-sm font-medium hover-transition border-b-2",
                        isActive(item.href)
                          ? "border-primary text-primary"
                          : "border-transparent text-slate-600 hover:text-slate-900 hover:border-slate-300"
                      )}
                    >
                      <item.icon className="mr-1 h-4 w-4" />
                      {item.name}
                    </Link>
                  ) : (
                    <button
                      onClick={() => handleAuthNavigation(item.href)}
                      className={cn(
                        "flex items-center px-1 py-2 text-sm font-medium hover-transition border-b-2",
                        isActive(item.href)
                          ? "border-primary text-primary"
                          : "border-transparent text-slate-600 hover:text-slate-900 hover:border-slate-300"
                      )}
                    >
                      <item.icon className="mr-1 h-4 w-4" />
                      {item.name}
                    </button>
                  )}
                </li>
              ))}
              
              {/* Authentication buttons */}
              <li>
                {isAuthenticated ? (
                  <button
                    onClick={() => {
                      logout();
                      navigate('/login');
                    }}
                    className="flex items-center px-3 py-2 text-sm font-medium text-slate-600 hover:text-slate-900 button-transition rounded-md hover:bg-slate-50"
                  >
                    <LogOut className="mr-1 h-4 w-4" />
                    Logout
                  </button>
                ) : (
                  <Link
                    to="/login"
                    className="flex items-center px-3 py-2 text-sm font-medium text-slate-600 hover:text-slate-900 button-transition rounded-md hover:bg-slate-50"
                  >
                    <LogIn className="mr-1 h-4 w-4" />
                    Login
                  </Link>
                )}
              </li>
            </ul>
          </nav>
          
          {/* Mobile Menu Button */}
          <div className="flex md:hidden">
            <button
              type="button"
              className="inline-flex items-center justify-center rounded-md p-2 text-slate-700 hover:bg-slate-100 hover:text-slate-900 button-transition"
              onClick={toggleMobileMenu}
            >
              <span className="sr-only">Open main menu</span>
              {mobileMenuOpen ? (
                <X className="block h-6 w-6" aria-hidden="true" />
              ) : (
                <Menu className="block h-6 w-6" aria-hidden="true" />
              )}
            </button>
          </div>
        </div>
      </div>
      
      {/* Mobile Menu */}
      {mobileMenuOpen && (
        <div className="md:hidden glass-panel animate-fade-in">
          <div className="space-y-1 px-4 pb-3 pt-2">
            {navigationItems.map((item) => (
              <div key={item.name}>
                {item.href === '/' ? (
                  <Link
                    to={item.href}
                    className={cn(
                      "flex items-center rounded-md px-3 py-2 text-base font-medium button-transition",
                      isActive(item.href)
                        ? "bg-primary text-white"
                        : "text-slate-600 hover:bg-slate-50 hover:text-slate-900"
                    )}
                    onClick={() => setMobileMenuOpen(false)}
                  >
                    <item.icon className="mr-3 h-5 w-5" />
                    {item.name}
                  </Link>
                ) : (
                  <button
                    className={cn(
                      "flex items-center rounded-md px-3 py-2 text-base font-medium button-transition w-full text-left",
                      isActive(item.href)
                        ? "bg-primary text-white"
                        : "text-slate-600 hover:bg-slate-50 hover:text-slate-900"
                    )}
                    onClick={() => {
                      setMobileMenuOpen(false);
                      handleAuthNavigation(item.href);
                    }}
                  >
                    <item.icon className="mr-3 h-5 w-5" />
                    {item.name}
                  </button>
                )}
              </div>
            ))}
            
            {/* Mobile Authentication options */}
            {isAuthenticated ? (
              <button
                onClick={() => {
                  logout();
                  setMobileMenuOpen(false);
                  navigate('/login');
                }}
                className="flex items-center rounded-md px-3 py-2 text-base font-medium button-transition text-slate-600 hover:bg-slate-50 hover:text-slate-900 w-full"
              >
                <LogOut className="mr-3 h-5 w-5" />
                Logout
              </button>
            ) : (
              <Link
                to="/login"
                className="flex items-center rounded-md px-3 py-2 text-base font-medium button-transition text-slate-600 hover:bg-slate-50 hover:text-slate-900"
                onClick={() => setMobileMenuOpen(false)}
              >
                <LogIn className="mr-3 h-5 w-5" />
                Login
              </Link>
            )}
          </div>
        </div>
      )}
    </header>
  );
}