'use client';

import { useState, useEffect } from 'react';
import { Dialog, DialogTrigger, DialogContent, DialogHeader, DialogTitle, DialogDescription } from '@/components/ui/dialog';
import { Input } from '@/components/ui/input';
import { Button } from '@/components/ui/button';
import { Avatar, AvatarImage, AvatarFallback } from '@/components/ui/avatar';
import { ThemeToggle } from '@/components/theme-toggle';
import { Menu, User } from 'lucide-react';
import { Sheet, SheetContent, SheetTrigger } from '@/components/ui/sheet';
import SidebarContent from '@/components/ui/SidebarContent';
import { Tabs, TabsList, TabsTrigger, TabsContent } from '@/components/ui/tabs';
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuLabel,
  DropdownMenuSeparator,
  DropdownMenuTrigger,
} from '@/components/ui/dropdown-menu';
import { useToast } from '@/components/ui/use-toast';
import Link from 'next/link';
import { useRouter } from 'next/navigation';

const Navbar = () => {
  const [isLoggedIn, setIsLoggedIn] = useState(false);
  const [dialogOpen, setDialogOpen] = useState(false);
  const [loginData, setLoginData] = useState({ nim: '', password: '' });
  const [registerData, setRegisterData] = useState({ username: '', nim: '', password: '', confirmPassword: '' });
  const [userData, setUserData] = useState<any>(null);
  const { toast } = useToast();
  const router = useRouter();

  // Check login status on component mount and when route changes
  useEffect(() => {
    const checkAuth = async () => {
      try {
        const response = await fetch('/api/auth/check');
        const data = await response.json();
        
        if (response.ok && data.user) {
          setUserData(data.user);
          setIsLoggedIn(true);
        } else {
          setUserData(null);
          setIsLoggedIn(false);
        }
      } catch (error) {
        console.error('Auth check failed:', error);
        setUserData(null);
        setIsLoggedIn(false);
      }
    };

    checkAuth();
  }, [router]);

  const handleLogin = async (e: React.FormEvent) => {
    e.preventDefault();
    
    // Validate input
    if (!loginData.nim || !loginData.password) {
      toast({
        variant: "destructive",
        title: "Login gagal",
        description: "NIM dan password harus diisi",
      });
      return;
    }

    console.log('Login attempt with data:', { 
      nim: loginData.nim, 
      password: '***' 
    });

    try {
      const response = await fetch('/api/auth/login', {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
        },
        body: JSON.stringify({
          nim: loginData.nim.trim(),
          password: loginData.password
        }),
      });

      console.log('Login response status:', response.status);
      const data = await response.json();
      console.log('Login response data:', data);

      if (!response.ok) {
        throw new Error(data.error || 'Login gagal');
      }

      toast({
        title: "Login berhasil",
        description: "Selamat datang kembali!",
      });
      
      setUserData(data.user);
      setIsLoggedIn(true);
      setDialogOpen(false);
      router.refresh();
    } catch (error) {
      console.error('Login error:', error);
      toast({
        variant: "destructive",
        title: "Login gagal",
        description: error instanceof Error ? error.message : 'Terjadi kesalahan saat login',
      });
    }
  };

  const handleRegister = async (e: React.FormEvent) => {
    e.preventDefault();
    
    // Validate passwords match
    if (registerData.password !== registerData.confirmPassword) {
      toast({
        variant: "destructive",
        title: "Registrasi gagal",
        description: "Password dan konfirmasi password tidak cocok",
      });
      return;
    }

    try {
      const response = await fetch('/api/auth/register', {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
        },
        body: JSON.stringify({
          username: registerData.username,
          nim: registerData.nim,
          password: registerData.password,
        }),
      });

      const data = await response.json();

      if (!response.ok) {
        throw new Error(data.error || 'Registrasi gagal');
      }

      toast({
        title: "Registrasi berhasil",
        description: "Silakan login dengan akun Anda",
      });
      
      // Reset form and switch to login tab
      setRegisterData({ username: '', nim: '', password: '', confirmPassword: '' });
      const tabsList = document.querySelector('[role="tablist"]');
      if (tabsList) {
        const loginTab = tabsList.querySelector('[value="login"]');
        if (loginTab) {
          (loginTab as HTMLElement).click();
        }
      }
    } catch (error) {
      toast({
        variant: "destructive",
        title: "Registrasi gagal",
        description: error instanceof Error ? error.message : 'Terjadi kesalahan saat registrasi',
      });
    }
  };

  const handleLogout = async () => {
    try {
      const response = await fetch('/api/auth/logout', {
        method: 'POST',
      });

      if (!response.ok) {
        throw new Error('Logout gagal');
      }

      toast({
        title: "Logout berhasil",
        description: "Sampai jumpa lagi!",
      });
      
      setUserData(null);
      setIsLoggedIn(false);
      router.push('/');
      router.refresh();
    } catch (error) {
      toast({
        variant: "destructive",
        title: "Logout gagal",
        description: error instanceof Error ? error.message : 'Terjadi kesalahan saat logout',
      });
    }
  };

  const handleProfileClick = async () => {
    try {
      const response = await fetch('/api/auth/check');
      const data = await response.json();
      
      if (response.ok && data.user) {
        router.push('/mahasiswa/profile');
      } else {
        toast({
          variant: "destructive",
          title: "Akses Ditolak",
          description: "Silakan login terlebih dahulu untuk mengakses profil",
        });
        setDialogOpen(true);
        router.push('/'); // Redirect to home if not logged in
      }
    } catch (error) {
      console.error('Error checking auth status:', error);
      toast({
        variant: "destructive",
        title: "Error",
        description: "Terjadi kesalahan saat memeriksa status login",
      });
      router.push('/');
    }
  };

  const handleInputChange = (e: React.ChangeEvent<HTMLInputElement>) => {
    const { name, value } = e.target;
    if (name.startsWith('login')) {
      const loginField = name.replace('login', '').toLowerCase();
      setLoginData(prev => ({
        ...prev,
        [loginField]: value
      }));
    } else {
      setRegisterData(prev => ({
        ...prev,
        [name]: value
      }));
    }
  };

  return (
    <div className="bg-background border-b sticky top-0 z-50 py-2 px-5 flex justify-between items-center">
      <div className="flex items-center gap-2">
        {/* Mobile Menu Button */}
        <div className="md:hidden">
          <Sheet>
            <SheetTrigger asChild>
              <Button variant="outline" size="icon">
                <Menu className="h-5 w-5" />
                <span className="sr-only">Toggle menu</span>
              </Button>
            </SheetTrigger>
            <SheetContent side="left" className="p-0 w-[250px] overflow-y-auto">
              <DialogTitle className="sr-only">Menu Navigasi</DialogTitle>
              <SidebarContent />
            </SheetContent>
          </Sheet>
        </div>
        <Link href="/" className="flex items-center text-lg font-semibold hover:text-primary transition-colors">
          <img src="/podif-icon.png" alt="PODIF Logo" className="h-6 w-auto mr-2" />
          PODIF
        </Link>
      </div>

      <div className="flex items-center gap-4">
        {isLoggedIn ? (
          <DropdownMenu>
            <DropdownMenuTrigger className="focus:outline-none">
              <Avatar>
                <AvatarImage src="" alt={userData?.username || 'User'} />
                <AvatarFallback className="bg-primary/10">
                  <User className="h-5 w-5" />
                </AvatarFallback>
              </Avatar>
            </DropdownMenuTrigger>
            <DropdownMenuContent align="end" side="bottom" sideOffset={9} alignOffset={0}>
              <DropdownMenuLabel>My Account</DropdownMenuLabel>
              <DropdownMenuSeparator />
              <DropdownMenuItem onClick={handleProfileClick}>
                Profile
              </DropdownMenuItem>
              <DropdownMenuItem onClick={handleLogout}>Logout</DropdownMenuItem>
            </DropdownMenuContent>
          </DropdownMenu>
        ) : (
          <Dialog open={dialogOpen} onOpenChange={setDialogOpen}>
            <DialogTrigger asChild>
              <Button variant="secondary">
                Login
              </Button>
            </DialogTrigger>
            <DialogContent className="sm:max-w-md">
              <DialogHeader>
                <DialogTitle>Portal Data Informatika</DialogTitle>
                <DialogDescription>Masuk atau daftar untuk mengakses portal</DialogDescription>
              </DialogHeader>
              <Tabs defaultValue="login" className="w-full mt-4">
                <TabsList className="grid w-full grid-cols-2">
                  <TabsTrigger value="login">Login</TabsTrigger>
                  <TabsTrigger value="register">Register</TabsTrigger>
                </TabsList>
                <TabsContent value="login">
                  <form onSubmit={handleLogin} className="space-y-4">
                    <Input 
                      type="text" 
                      name="loginNim"
                      placeholder="NIM" 
                      value={loginData.nim}
                      onChange={handleInputChange}
                      required
                    />
                    <Input 
                      type="password" 
                      name="loginPassword"
                      placeholder="Password" 
                      value={loginData.password}
                      onChange={handleInputChange}
                      required
                    />
                    <Button className="w-full" type="submit">
                      Login
                    </Button>
                  </form>
                </TabsContent>
                <TabsContent value="register">
                  <form onSubmit={handleRegister} className="space-y-4">
                    <Input 
                      type="text" 
                      name="username"
                      placeholder="Nama Lengkap" 
                      value={registerData.username}
                      onChange={handleInputChange}
                      required
                    />
                    <Input 
                      type="text" 
                      name="nim"
                      placeholder="NIM" 
                      value={registerData.nim}
                      onChange={handleInputChange}
                      required
                    />
                    <Input 
                      type="password" 
                      name="password"
                      placeholder="Password" 
                      value={registerData.password}
                      onChange={handleInputChange}
                      required
                    />
                    <Input 
                      type="password" 
                      name="confirmPassword"
                      placeholder="Konfirmasi Password" 
                      value={registerData.confirmPassword}
                      onChange={handleInputChange}
                      required
                    />
                    <Button className="w-full" type="submit">
                      Register
                    </Button>
                  </form>
                </TabsContent>
              </Tabs>
            </DialogContent>
          </Dialog>
        )}
        <ThemeToggle />
      </div>
    </div>
  );
};

export default Navbar;