'use client';

import { useForm } from 'react-hook-form';
import { zodResolver } from '@hookform/resolvers/zod';
import * as z from 'zod';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { Label } from '@/components/ui/label';
import { useToast } from '@/hooks/use-toast';
import {
  Card,
  CardContent,
  CardDescription,
  CardFooter,
  CardHeader,
  CardTitle,
} from '@/components/ui/card';
import { useRouter } from 'next/navigation';
import { login } from '@/lib/actions/auth';

const loginSchema = z.object({
  email: z.string().email({ message: 'Invalid email address.' }),
  password: z.string().min(1, { message: 'Password is required.' }),
});

type LoginFormValues = z.infer<typeof loginSchema>;

export default function LoginPage() {
  const router = useRouter();
  const { toast } = useToast();
  const {
    register,
    handleSubmit,
    formState: { errors, isSubmitting },
  } = useForm<LoginFormValues>({
    resolver: zodResolver(loginSchema),
  });

  const onSubmit = async (data: LoginFormValues) => {
    try {
      const result = await login(data);

      if (result.success) {
        toast({
          title: 'Login Successful',
          description: 'Redirecting to your dashboard...',
        });
        router.push('/admin');
      } else {
        throw new Error(result.message);
      }
    } catch (error: any) {
      toast({
        variant: 'destructive',
        title: 'Login Failed',
        description: error.message || 'An unexpected error occurred.',
      });
    }
  };

  return (
    <main className="flex min-h-screen flex-col items-center justify-center bg-background p-8">
      <Card className="w-full max-w-sm">
        <CardHeader className="text-center">
          <CardTitle className="text-2xl font-bold tracking-tight">
            EstimateFlow Admin
          </CardTitle>
          <CardDescription>
            Welcome back! Please sign in to continue.
          </CardDescription>
        </CardHeader>
        <CardContent>
          <form onSubmit={handleSubmit(onSubmit)} className="space-y-4">
            <div className="space-y-2">
              <Label htmlFor="email">Email</Label>
              <Input
                id="email"
                type="email"
                placeholder="admin@example.com"
                {...register('email')}
              />
              {errors.email && (
                <p className="text-sm text-destructive">{errors.email.message}</p>
              )}
            </div>
            <div className="space-y-2">
              <Label htmlFor="password">Password</Label>
              <Input
                id="password"
                type="password"
                placeholder="password"
                {...register('password')}
              />
              {errors.password && (
                <p className="text-sm text-destructive">
                  {errors.password.message}
                </p>
              )}
            </div>
            <Button type="submit" className="w-full" disabled={isSubmitting}>
              {isSubmitting ? 'Signing In...' : 'Sign In'}
            </Button>
          </form>
        </CardContent>
        <CardFooter>
            <p className="text-xs text-center w-full text-muted-foreground">Use your updated credentials to sign in.</p>
        </CardFooter>
      </Card>
    </main>
  );
}