"use client";

import { Loader2 } from "lucide-react";
import { useRouter } from "next/navigation";
import { useEffect, useState } from "react";
import { Button } from "@/components/ui/button";
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import { signIn, useSession } from "@/lib/auth-client";

export default function LoginPage() {
  const router = useRouter();
  const { data: session, isPending } = useSession();
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState("");

  useEffect(() => {
    if (!isPending && session?.user) {
      router.replace("/dashboard");
    }
  }, [session, isPending, router]);

  const handleSubmit = async (e: React.FormEvent<HTMLFormElement>) => {
    e.preventDefault();
    setLoading(true);
    setError("");

    const formData = new FormData(e.currentTarget);
    const email = formData.get("email") as string;
    const password = formData.get("password") as string;

    try {
      const result = await signIn.email({
        email,
        password,
      });

      if (result.error) {
        setError(result.error.message || "Invalid email or password");
      } else {
        router.push("/dashboard");
      }
    } catch (_err) {
      setError("Failed to connect to server");
    } finally {
      setLoading(false);
    }
  };

  if (isPending) {
    return (
      <div className="min-h-screen flex items-center justify-center bg-gradient-to-br from-slate-50 to-slate-100">
        <Loader2 className="h-8 w-8 animate-spin text-muted-foreground" />
      </div>
    );
  }

  if (session?.user) {
    return (
      <div className="min-h-screen flex items-center justify-center bg-gradient-to-br from-slate-50 to-slate-100">
        <Loader2 className="h-8 w-8 animate-spin text-muted-foreground" />
      </div>
    );
  }

  return (
    <div className="min-h-screen flex items-center justify-center bg-gradient-to-br from-slate-50 to-slate-100 p-4">
      <Card className="w-full max-w-md">
        <CardHeader className="space-y-1">
          <CardTitle className="text-2xl font-bold text-center">Minikura</CardTitle>
          <CardDescription className="text-center">Sign in to your account</CardDescription>
        </CardHeader>
        <CardContent>
          <form onSubmit={handleSubmit} className="space-y-4">
            <div className="space-y-2">
              <Label htmlFor="email">Email</Label>
              <Input
                id="email"
                name="email"
                type="email"
                placeholder="admin@example.com"
                required
                autoFocus
              />
            </div>
            <div className="space-y-2">
              <Label htmlFor="password">Password</Label>
              <Input
                id="password"
                name="password"
                type="password"
                placeholder="••••••••"
                required
              />
            </div>
            {error && <div className="text-sm text-red-600 text-center">{error}</div>}
            <Button type="submit" className="w-full" disabled={loading}>
              {loading ? "Signing in..." : "Sign In"}
            </Button>
          </form>
        </CardContent>
      </Card>
    </div>
  );
}