"use client";

import { useState } from "react";
import { useRouter } from "next/navigation";
import { useSession } from "next-auth/react";
import Link from "next/link";
import { createTripAction } from "@/features/trip/actions";

const SAMPLE_MOUNTAINS = [
  { name: "Gunung Papandayan", location: "Garut, Jawa Barat" },
  { name: "Gunung Ciremai", location: "Kuningan, Jawa Barat" },
  { name: "Gunung Pangrango", location: "Bogor/Cianjur, Jawa Barat" },
  { name: "Gunung Gede", location: "Bogor/Cianjur, Jawa Barat" },
  { name: "Gunung Tangkuban Parahu", location: "Bandung, Jawa Barat" },
  { name: "Gunung Bukit Tunggul", location: "Bandung, Jawa Barat" },
  { name: "Gunung Malabar", location: "Bandung, Jawa Barat" },
  { name: "Gunung Guntur", location: "Garut, Jawa Barat" },
];

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

  if (!session?.user) {
    return (
      <div className="flex min-h-[calc(100vh-3.5rem)] items-center justify-center px-4">
        <div className="text-center">
          <div className="mx-auto mb-4 flex h-16 w-16 items-center justify-center rounded-full bg-primary-50 text-3xl">
            🔒
          </div>
          <p className="mb-4 text-neutral-500">
            Kamu harus login untuk membuat trip.
          </p>
          <Link
            href="/login"
            className="inline-block rounded-xl bg-primary-600 px-6 py-2.5 text-sm font-semibold text-white hover:bg-primary-700"
          >
            Login
          </Link>
        </div>
      </div>
    );
  }

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

    const formData = new FormData(e.currentTarget);
    const result = await createTripAction(formData);

    setLoading(false);

    if (result.error) {
      setError(result.error);
    } else if (result.tripId) {
      router.push(`/trips/${result.tripId}`);
    }
  }

  function handleMountainSelect(e: React.ChangeEvent<HTMLSelectElement>) {
    const selected = SAMPLE_MOUNTAINS.find((m) => m.name === e.target.value);
    if (selected) {
      const form = e.target.form;
      if (form) {
        const mountainInput = form.elements.namedItem(
          "mountain"
        ) as HTMLInputElement;
        const locationInput = form.elements.namedItem(
          "location"
        ) as HTMLInputElement;
        mountainInput.value = selected.name;
        locationInput.value = selected.location;
      }
    }
  }

  return (
    <div className="mx-auto max-w-2xl px-4 py-8">
      <div className="mb-6">
        <h1 className="text-2xl font-bold text-neutral-800">Buat Trip Baru</h1>
        <p className="mt-1 text-sm text-neutral-500">
          Ajak teman baru naik gunung bareng!
        </p>
      </div>

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

        <form onSubmit={handleSubmit} className="space-y-5">
          {/* Mountain Quick Picker */}
          <div className="rounded-xl bg-primary-50 p-4">
            <label className="mb-2 flex items-center gap-1.5 text-sm font-bold text-primary-800">
              <span>🏔️</span> Pilih Gunung Jawa Barat
            </label>
            <select
              onChange={handleMountainSelect}
              className="w-full rounded-lg border border-primary-200 bg-white px-4 py-2.5 text-sm text-neutral-800"
              defaultValue=""
            >
              <option value="" disabled>
                Pilih gunung...
              </option>
              {SAMPLE_MOUNTAINS.map((m) => (
                <option key={m.name} value={m.name}>
                  {m.name} — {m.location}
                </option>
              ))}
            </select>
          </div>

          <div>
            <label htmlFor="title" className="mb-1.5 block text-sm font-semibold text-neutral-700">
              Judul Trip
            </label>
            <input
              id="title"
              name="title"
              type="text"
              required
              className="w-full rounded-xl border border-neutral-200 bg-neutral-50 px-4 py-2.5 text-sm text-neutral-800 placeholder:text-neutral-400 focus:bg-white"
              placeholder="contoh: Open Trip Papandayan Weekend"
            />
          </div>

          <div className="grid gap-4 sm:grid-cols-2">
            <div>
              <label htmlFor="mountain" className="mb-1.5 block text-sm font-semibold text-neutral-700">
                Nama Gunung
              </label>
              <input
                id="mountain"
                name="mountain"
                type="text"
                required
                className="w-full rounded-xl border border-neutral-200 bg-neutral-50 px-4 py-2.5 text-sm text-neutral-800 placeholder:text-neutral-400 focus:bg-white"
                placeholder="Gunung Papandayan"
              />
            </div>
            <div>
              <label htmlFor="location" className="mb-1.5 block text-sm font-semibold text-neutral-700">
                Lokasi
              </label>
              <input
                id="location"
                name="location"
                type="text"
                required
                className="w-full rounded-xl border border-neutral-200 bg-neutral-50 px-4 py-2.5 text-sm text-neutral-800 placeholder:text-neutral-400 focus:bg-white"
                placeholder="Garut, Jawa Barat"
              />
            </div>
          </div>

          <div>
            <label htmlFor="description" className="mb-1.5 block text-sm font-semibold text-neutral-700">
              Deskripsi
            </label>
            <textarea
              id="description"
              name="description"
              rows={4}
              className="w-full rounded-xl border border-neutral-200 bg-neutral-50 px-4 py-2.5 text-sm text-neutral-800 placeholder:text-neutral-400 focus:bg-white"
              placeholder="Detail trip, itinerary, meeting point, fasilitas..."
            />
          </div>

          <div className="grid gap-4 sm:grid-cols-3">
            <div>
              <label htmlFor="date" className="mb-1.5 block text-sm font-semibold text-neutral-700">
                Tanggal
              </label>
              <input
                id="date"
                name="date"
                type="date"
                required
                className="w-full rounded-xl border border-neutral-200 bg-neutral-50 px-4 py-2.5 text-sm text-neutral-800 focus:bg-white"
              />
            </div>
            <div>
              <label htmlFor="maxParticipants" className="mb-1.5 block text-sm font-semibold text-neutral-700">
                Maks Peserta
              </label>
              <input
                id="maxParticipants"
                name="maxParticipants"
                type="number"
                required
                min={1}
                className="w-full rounded-xl border border-neutral-200 bg-neutral-50 px-4 py-2.5 text-sm text-neutral-800 placeholder:text-neutral-400 focus:bg-white"
                placeholder="10"
              />
            </div>
            <div>
              <label htmlFor="price" className="mb-1.5 block text-sm font-semibold text-neutral-700">
                Harga (Rp)
              </label>
              <input
                id="price"
                name="price"
                type="number"
                required
                min={0}
                className="w-full rounded-xl border border-neutral-200 bg-neutral-50 px-4 py-2.5 text-sm text-neutral-800 placeholder:text-neutral-400 focus:bg-white"
                placeholder="150000"
              />
            </div>
          </div>

          <button
            type="submit"
            disabled={loading}
            className="w-full rounded-xl bg-primary-600 py-3 text-sm font-bold text-white shadow-lg shadow-primary-600/20 transition-colors hover:bg-primary-700 disabled:opacity-50"
          >
            {loading ? "Membuat Trip..." : "Buat Trip"}
          </button>
        </form>
      </div>
    </div>
  );
}