import { useEffect, useState } from "react";
import { Link, useParams } from "react-router-dom";

import { Badge } from "@/components/ui/badge";
import { Button } from "@/components/ui/button";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import { Textarea } from "@/components/ui/textarea";
import { useAuth } from "@/context/AuthContext";
import { apiGet, apiPatch } from "@/lib/api";
import { isLikelyApiHotelBooking, mapApiBookingToBooking } from "@/lib/hotel-adapters";
import type { Booking } from "@/lib/types";
import { useAuthStore } from "@/store/authStore";
import { formatDate, formatDateTime, formatMoney } from "@/lib/format";
import { roomDisplayName } from "@/lib/room-utils";

export function BookingDetailPage() {
  const { id } = useParams<{ id: string }>();
  const selectedPropertyId = useAuthStore((s) => s.selectedPropertyId);
  const [b, setB] = useState<Booking | null>(null);
  const [note, setNote] = useState("");
  const { canEditBookings } = useAuth();

  useEffect(() => {
    if (!id) return;
    apiGet<unknown>(`/bookings/${id}`)
      .then((raw) => {
        if (isLikelyApiHotelBooking(raw)) setB(mapApiBookingToBooking(raw));
        else setB(raw as Booking);
      })
      .catch(console.error);
  }, [id, selectedPropertyId]);

  if (!b) return <p className="text-muted-foreground">Loading…</p>;

  async function addNote() {
    if (!b || !note.trim() || !canEditBookings) return;
    const next = await apiPatch<unknown>(`/bookings/${b.id}`, {
      internalNotes: [note.trim()],
    });
    setB(
      isLikelyApiHotelBooking(next)
        ? mapApiBookingToBooking(next)
        : (next as Booking)
    );
    setNote("");
  }

  return (
    <div className="space-y-6">
      <div className="flex flex-wrap items-center justify-between gap-3">
        <div>
          <Button variant="ghost" size="sm" asChild>
            <Link to="/bookings">← Back</Link>
          </Button>
          <h1 className="mt-2 text-2xl font-bold">
            {b.guest.firstName} {b.guest.lastName}
          </h1>
          <p className="text-muted-foreground text-sm">{b.id}</p>
        </div>
        <Badge>{b.status}</Badge>
      </div>

      <div className="grid gap-4 lg:grid-cols-2">
        <Card className="rounded-2xl">
          <CardHeader>
            <CardTitle className="text-base">Guest</CardTitle>
          </CardHeader>
          <CardContent className="space-y-1 text-sm">
            <p>
              <span className="text-muted-foreground">Email:</span>{" "}
              {b.guest.email}
            </p>
            <p>
              <span className="text-muted-foreground">Phone:</span>{" "}
              {b.guest.phone}
            </p>
            <p>
              <span className="text-muted-foreground">PNR:</span>{" "}
              {b.guest.flightBookingNumber}
            </p>
            <p>
              <span className="text-muted-foreground">Arrival:</span>{" "}
              {b.guest.arrivalTime}
            </p>
          </CardContent>
        </Card>

        <Card className="rounded-2xl">
          <CardHeader>
            <CardTitle className="text-base">Stay</CardTitle>
          </CardHeader>
          <CardContent className="space-y-1 text-sm">
            <p>
              {formatDate(b.checkIn)} → {formatDate(b.checkOut)} ({b.nights}{" "}
              nights)
            </p>
            <p>Guests: {b.guests}</p>
            <p>Room: {b.roomDisplayLabel ?? roomDisplayName(b.roomId)}</p>
            {b.holdReference && <p>Hold: {b.holdReference}</p>}
            {b.confirmationId && <p>Payment ref: {b.confirmationId}</p>}
            {b.paidAt && <p>Paid: {formatDateTime(b.paidAt)}</p>}
          </CardContent>
        </Card>

        <Card className="rounded-2xl lg:col-span-2">
          <CardHeader>
            <CardTitle className="text-base">Pricing</CardTitle>
          </CardHeader>
          <CardContent className="grid gap-2 text-sm sm:grid-cols-2">
            <p>Nightly subtotal: {formatMoney(b.pricing.nightlySubtotal)}</p>
            <p>Coupon: {b.pricing.couponCode ?? "—"}</p>
            <p>Discount: {b.pricing.discountPercent}%</p>
            <p>Tax: {formatMoney(b.pricing.taxAmount)}</p>
            <p className="font-semibold sm:col-span-2">
              Total: {formatMoney(b.pricing.total)}
            </p>
            <p>Referral: {b.referralCode ?? "—"}</p>
          </CardContent>
        </Card>

        <Card className="rounded-2xl lg:col-span-2">
          <CardHeader>
            <CardTitle className="text-base">Internal notes</CardTitle>
          </CardHeader>
          <CardContent className="space-y-3">
            <ul className="list-inside list-disc text-sm text-muted-foreground">
              {(b.internalNotes ?? []).map((n, i) => (
                <li key={i}>{n}</li>
              ))}
            </ul>
            {canEditBookings && (
              <>
                <Textarea
                  placeholder="Add note…"
                  value={note}
                  onChange={(e) => setNote(e.target.value)}
                />
                <Button size="sm" onClick={addNote}>
                  Save note
                </Button>
              </>
            )}
          </CardContent>
        </Card>
      </div>
    </div>
  );
}