import { notFound } from "next/navigation";
import { getServerSession } from "next-auth";
import Link from "next/link";
import { authOptions } from "@/lib/auth";
import { tripService } from "@/server/services/trip.service";
import { trustService } from "@/server/services/trust.service";
import { formatRupiah } from "@/lib/utils";
import { formatTripCalendarDateRangeLong } from "@/lib/trip-dates";
import { JoinTripButton } from "@/features/trip/components/join-trip-button";
import { OrganizerJoinRequests } from "@/features/trip/components/organizer-join-requests";
import { OrganizerTrustPanel } from "@/features/trip/components/organizer-trust-panel";
import { TripProgramBlock } from "@/features/trip/components/trip-program-block";
import { OrganizerPaymentQueue } from "@/features/booking/components/organizer-payment-queue";
import { ImageGallery } from "@/features/trip/components/image-gallery";
import { TripReviewSection } from "@/features/review/components/trip-review-section";
import {
  isPastTripLastDayForReview,
  isTripDepartureDayPast,
} from "@/lib/trip-dates";

export default async function TripDetailPage({
  params,
}: {
  params: Promise<{ id: string }>;
}) {
  const { id } = await params;
  const session = await getServerSession(authOptions);

  let trip;
  try {
    trip = await tripService.getTripById(id);
  } catch {
    notFound();
  }

  const organizerTrust = await trustService.getOrganizerTrust(
    trip.organizerId
  );

  const activeParticipants = trip.participants.filter(
    (p) => p.status !== "CANCELLED"
  );
  const confirmedParticipants = activeParticipants.filter(
    (p) => p.status === "CONFIRMED"
  );
  const pendingParticipants = activeParticipants.filter(
    (p) => p.status === "PENDING"
  );
  const participantCount = activeParticipants.length;
  const confirmedCount = confirmedParticipants.length;
  const spotsLeft = trip.maxParticipants - participantCount;
  const fillPercent = Math.min(
    (participantCount / trip.maxParticipants) * 100,
    100
  );
  const isOrganizer = session?.user?.id === trip.organizerId;
  const currentParticipation = session?.user
    ? trip.participants.find(
        (p) => p.userId === session.user.id && p.status !== "CANCELLED"
      )
    : null;

  const isDeparturePast = isTripDepartureDayPast(trip.date);
  const canReview =
    !!session?.user &&
    !isOrganizer &&
    currentParticipation?.status === "CONFIRMED" &&
    isPastTripLastDayForReview(trip.date, trip.endDate);

  const myReview = session?.user
    ? trip.reviews.find((r) => r.userId === session.user.id) ?? null
    : null;

  const averageRating =
    trip.reviews.length > 0
      ? Math.round(
          (trip.reviews.reduce((s, r) => s + r.rating, 0) /
            trip.reviews.length) *
            10
        ) / 10
      : null;

  const paymentPendingParticipants = activeParticipants.filter(
    (p) => p.markedPaidAt && !p.paymentConfirmedAt
  );

  return (
    <div className="mx-auto max-w-3xl px-4 py-4 sm:py-8">
      {/* Breadcrumb */}
      <div className="mb-3 flex items-center gap-2 text-xs text-neutral-500 sm:mb-4 sm:text-sm">
        <Link href="/trips" className="hover:text-primary-600">
          Open Trip
        </Link>
        <span>/</span>
        <span className="truncate text-neutral-700">{trip.mountain}</span>
      </div>

      <div className="overflow-hidden rounded-2xl border border-neutral-200 bg-white shadow-sm">
        {/* Image Gallery */}
        <ImageGallery images={trip.images} />

        {/* Title bar */}
        <div className="border-b border-neutral-100 px-4 py-3 sm:px-6 sm:py-4">
          <div className="flex items-start justify-between gap-2">
            <div className="min-w-0">
              <h1 className="text-lg font-bold text-neutral-800 sm:text-xl">
                {trip.title}
              </h1>
              <p className="mt-0.5 flex items-center gap-1.5 text-sm text-neutral-500">
                🏔️ {trip.mountain}
              </p>
            </div>
            <span
              className={`shrink-0 rounded-full px-2.5 py-0.5 text-xs font-bold sm:px-3 sm:py-1 ${
                trip.status === "OPEN"
                  ? "bg-primary-100 text-primary-700"
                  : trip.status === "FULL"
                  ? "bg-amber-100 text-amber-700"
                  : "bg-neutral-100 text-neutral-500"
              }`}
            >
              {trip.status}
            </span>
          </div>
        </div>

        <div className="space-y-5 p-4 sm:space-y-6 sm:p-6">
          {/* Info Grid */}
          <div className="grid grid-cols-2 gap-2 sm:gap-3">
            <div className="flex items-center gap-2 rounded-xl bg-neutral-50 p-3 sm:gap-3 sm:p-4">
              <span className="flex h-8 w-8 shrink-0 items-center justify-center rounded-lg bg-secondary-100 text-sm sm:h-10 sm:w-10 sm:text-lg">
                📍
              </span>
              <div className="min-w-0">
                <p className="text-[10px] font-medium text-neutral-400 sm:text-xs">Lokasi</p>
                <p className="truncate text-xs font-semibold text-neutral-800 sm:text-sm">{trip.location}</p>
              </div>
            </div>

            <div className="flex items-center gap-2 rounded-xl bg-neutral-50 p-3 sm:gap-3 sm:p-4">
              <span className="flex h-8 w-8 shrink-0 items-center justify-center rounded-lg bg-secondary-100 text-sm sm:h-10 sm:w-10 sm:text-lg">
                📅
              </span>
              <div className="min-w-0">
                <p className="text-[10px] font-medium text-neutral-400 sm:text-xs">Tanggal</p>
                <p className="truncate text-xs font-semibold text-neutral-800 sm:text-sm">
                  {formatTripCalendarDateRangeLong(trip.date, trip.endDate)}
                </p>
              </div>
            </div>

            <div className="flex items-center gap-2 rounded-xl bg-primary-50 p-3 sm:gap-3 sm:p-4">
              <span className="flex h-8 w-8 shrink-0 items-center justify-center rounded-lg bg-primary-100 text-sm sm:h-10 sm:w-10 sm:text-lg">
                💰
              </span>
              <div className="min-w-0">
                <p className="text-[10px] font-medium text-primary-600 sm:text-xs">Harga</p>
                <p className="text-base font-bold text-primary-700 sm:text-xl">
                  {formatRupiah(trip.price)}
                </p>
              </div>
            </div>

            <div className="flex items-center gap-2 rounded-xl bg-neutral-50 p-3 sm:gap-3 sm:p-4">
              <span className="flex h-8 w-8 shrink-0 items-center justify-center rounded-lg bg-neutral-200 text-sm sm:h-10 sm:w-10 sm:text-lg">
                👤
              </span>
              <div className="min-w-0">
                <p className="text-[10px] font-medium text-neutral-400 sm:text-xs">Organizer</p>
                <p className="truncate text-xs font-semibold text-neutral-800 sm:text-sm">
                  {trip.organizer.name}
                </p>
              </div>
            </div>
          </div>

          <OrganizerTrustPanel
            name={trip.organizer.name}
            image={trip.organizer.image}
            trust={organizerTrust}
          />

          {/* Participant Progress */}
          <div className="rounded-xl border border-neutral-200 p-3 sm:p-4">
            <div className="mb-2 flex items-center justify-between">
              <span className="text-xs font-semibold text-neutral-700 sm:text-sm">
                Peserta
              </span>
              <span className="text-xs font-bold text-neutral-800 sm:text-sm">
                {participantCount}{" "}
                <span className="font-normal text-neutral-400">
                  / {trip.maxParticipants}
                </span>
              </span>
            </div>
            <div className="h-2 overflow-hidden rounded-full bg-neutral-100 sm:h-2.5">
              <div
                className={`h-full rounded-full transition-all ${
                  fillPercent >= 100
                    ? "bg-amber-500"
                    : fillPercent >= 70
                    ? "bg-secondary-500"
                    : "bg-primary-500"
                }`}
                style={{ width: `${fillPercent}%` }}
              />
            </div>
            <p className="mt-1.5 text-[11px] text-neutral-500 sm:text-xs">
              Maksimal {trip.maxParticipants} orang. Saat ini {participantCount}{" "}
              mendaftar, {confirmedCount} sudah disetujui organizer.
            </p>
            <p className="mt-1 text-[11px] text-neutral-500 sm:text-xs">
              {spotsLeft > 0
                ? `Masih ada ${spotsLeft} tempat — yuk gabung!`
                : "Trip sudah penuh"}
              {confirmedCount < participantCount && (
                <>
                  {" "}
                  · {participantCount - confirmedCount} menunggu persetujuan
                  organizer
                </>
              )}
            </p>
          </div>

          <TripProgramBlock
            meetingPoint={trip.meetingPoint}
            itinerary={trip.itinerary}
            whatsIncluded={trip.whatsIncluded}
            whatsExcluded={trip.whatsExcluded}
          />

          {/* Description */}
          {trip.description && (
            <div>
              <h2 className="mb-2 text-xs font-bold text-neutral-700 sm:text-sm">
                Deskripsi Trip
              </h2>
              <p className="whitespace-pre-wrap text-xs leading-relaxed text-neutral-600 sm:text-sm">
                {trip.description}
              </p>
            </div>
          )}

          {isOrganizer && pendingParticipants.length > 0 && (
            <OrganizerJoinRequests
              tripId={trip.id}
              pending={pendingParticipants.map((p) => ({
                id: p.id,
                user: p.user,
                markedPaidAt: p.markedPaidAt,
              }))}
            />
          )}

          {isOrganizer && paymentPendingParticipants.length > 0 && (
            <OrganizerPaymentQueue
              tripId={trip.id}
              items={paymentPendingParticipants.map((p) => ({
                id: p.id,
                user: p.user,
                joinStatus:
                  p.status === "PENDING" ? ("PENDING" as const) : ("CONFIRMED" as const),
              }))}
            />
          )}

          {/* Action */}
          <JoinTripButton
            tripId={trip.id}
            isLoggedIn={!!session?.user}
            isOrganizer={isOrganizer}
            isJoined={!!currentParticipation}
            participationStatus={
              currentParticipation?.status === "PENDING" ||
              currentParticipation?.status === "CONFIRMED"
                ? currentParticipation.status
                : null
            }
            participantPayment={
              currentParticipation
                ? {
                    markedPaidAt: currentParticipation.markedPaidAt,
                    paymentConfirmedAt:
                      currentParticipation.paymentConfirmedAt,
                  }
                : null
            }
            isFull={spotsLeft <= 0}
            tripStatus={trip.status}
            isDeparturePast={isDeparturePast}
          />

          <TripReviewSection
            tripId={trip.id}
            reviews={trip.reviews.map((r) => ({
              id: r.id,
              rating: r.rating,
              comment: r.comment,
              createdAt: r.createdAt,
              user: r.user,
            }))}
            averageRating={averageRating}
            canReview={canReview}
            myReview={
              myReview
                ? { rating: myReview.rating, comment: myReview.comment }
                : null
            }
          />

          {/* Peserta yang sudah disetujui organizer (publik) */}
          <div>
            <h2 className="mb-3 text-xs font-bold text-neutral-700 sm:text-sm">
              Peserta terkonfirmasi ({confirmedCount})
            </h2>
            {confirmedCount === 0 ? (
              <p className="text-xs text-neutral-400 sm:text-sm">
                Belum ada peserta yang dikonfirmasi.{" "}
                {pendingParticipants.length > 0
                  ? "Cek permintaan join di atas untuk menyetujui peserta."
                  : "Jadilah yang pertama mendaftar! 🎒"}
              </p>
            ) : (
              <div className="flex flex-wrap gap-1.5 sm:gap-2">
                {confirmedParticipants.map((p) => (
                  <div
                    key={p.id}
                    className="flex items-center gap-1.5 rounded-full bg-neutral-100 px-2.5 py-1 sm:gap-2 sm:px-3 sm:py-1.5"
                  >
                    <div className="flex h-5 w-5 items-center justify-center rounded-full bg-primary-600 text-[9px] font-bold text-white sm:h-6 sm:w-6 sm:text-[10px]">
                      {p.user.name.charAt(0).toUpperCase()}
                    </div>
                    <span className="text-xs font-medium text-neutral-700 sm:text-sm">
                      {p.user.name}
                    </span>
                  </div>
                ))}
              </div>
            )}
          </div>
        </div>
      </div>
    </div>
  );
}