"use client";

import { useState, Suspense } from "react";
import { signIn, getSession } from "next-auth/react";
import { useRouter, useSearchParams } from "next/navigation";
import Link from "next/link";
import Image from "next/image";
import { GoogleSignInButton } from "@/components/shared/google-sign-in-button";

function safeInternalPath(raw: string | null): string {
  if (!raw || !raw.startsWith("/") || raw.startsWith("//")) return "/";
  return raw;
}

function LoginForm() {
  const router = useRouter();
  const searchParams = useSearchParams();
  const [error, setError] = useState("");
  const [loading, setLoading] = useState(false);

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

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

    const result = await signIn("credentials", {
      email,
      password,
      redirect: false,
    });

    setLoading(false);

    if (result?.error) {
      setError(result.error);
    } else {
      const callbackPath = safeInternalPath(searchParams.get("callbackUrl"));
      const session = await getSession();
      // Admin selalu diarahkan ke dashboard /admin setelah login — kecuali
      // callbackUrl memang menuju sub-halaman admin (deep link dari /admin/...).
      // callbackUrl non-admin (mis. "/" sisa dari percobaan login Google) tidak
      // boleh membuat admin "nyangkut" di halaman publik.
      const next =
        session?.user?.isAdmin && !callbackPath.startsWith("/admin")
          ? "/admin"
          : callbackPath;
      router.push(next);
      router.refresh();
    }
  }

  return (
    <div className="relative flex min-h-[calc(100vh-4rem)] items-center justify-center px-4 py-8 sm:py-12">
      {/* Background image */}
      <Image
        src="/images/seed/gunung-login.jpg"
        alt=""
        fill
        className="object-cover"
        priority
      />
      {/* Dark overlay */}
      <div className="absolute inset-0 bg-neutral-900/60 backdrop-blur-[2px]" />

      <div className="relative z-10 w-full max-w-sm">
        {/* Header */}
        <div className="mb-6 text-center sm:mb-8">
          <Link href="/" className="mb-3 inline-flex items-center gap-2">
            <Image
              src="/images/SeTrip.png"
              alt="SeTrip"
              width={40}
              height={40}
              className="h-10 w-10 object-contain"
            />
            <span className="text-2xl font-bold text-white">
              Se<span className="text-primary-400">Trip</span>
            </span>
          </Link>
          <p className="text-sm text-neutral-300">
            Login dan mulai petualanganmu bareng
          </p>
        </div>

        {/* Card */}
        <div className="rounded-2xl border border-neutral-200 bg-white p-6 shadow-2xl">
          {error && (
            <div className="mb-4 rounded-xl bg-red-50 px-4 py-3 text-sm font-medium text-red-600">
              {error}
            </div>
          )}

          <GoogleSignInButton callbackUrl={safeInternalPath(searchParams.get("callbackUrl"))} />

          <div className="my-4 flex items-center gap-3 text-xs text-neutral-400">
            <span className="h-px flex-1 bg-neutral-200" />
            <span>atau</span>
            <span className="h-px flex-1 bg-neutral-200" />
          </div>

          <form onSubmit={handleSubmit} className="space-y-4">
            <div>
              <label htmlFor="email" className="mb-1.5 block text-sm font-semibold text-neutral-700">
                Email
              </label>
              <input
                id="email"
                name="email"
                type="email"
                required
                className="w-full rounded-xl border border-neutral-200 bg-neutral-50 px-4 py-2.5 text-sm text-neutral-800 transition-colors placeholder:text-neutral-400 focus:bg-white"
                placeholder="email@example.com"
              />
            </div>

            <div>
              <label htmlFor="password" className="mb-1.5 block text-sm font-semibold text-neutral-700">
                Password
              </label>
              <input
                id="password"
                name="password"
                type="password"
                required
                className="w-full rounded-xl border border-neutral-200 bg-neutral-50 px-4 py-2.5 text-sm text-neutral-800 transition-colors placeholder:text-neutral-400 focus:bg-white"
                placeholder="Minimal 6 karakter"
              />
            </div>

            <button
              type="submit"
              disabled={loading}
              className="w-full rounded-xl bg-primary-600 py-2.5 text-sm font-bold text-white shadow-lg shadow-primary-600/20 transition-colors hover:bg-primary-700 disabled:opacity-50"
            >
              {loading ? "Loading..." : "Login"}
            </button>
          </form>
        </div>

        <p className="mt-5 text-center text-sm text-neutral-300">
          Belum punya akun?{" "}
          <Link href="/register" className="font-semibold text-primary-400 hover:text-primary-300">
            Daftar sekarang
          </Link>
        </p>
      </div>
    </div>
  );
}

export default function LoginPage() {
  return (
    <Suspense fallback={null}>
      <LoginForm />
    </Suspense>
  );
}
