import React, { useState } from "react";
import { useQuery, useMutation } from "@tanstack/react-query";
import { queryClient } from "@/client/rpc-client";

interface BookingStatusPageProps {
  token: string;
}

type BookingStatus = "pending" | "confirmed" | "cancelled" | "completed";

function getStatusInfo(status: BookingStatus) {
  switch (status) {
    case "pending":
      return {
        label: "Wartet auf Bestätigung",
        color: "yellow",
        icon: "⏳",
        bgColor: "bg-yellow-50",
        borderColor: "border-yellow-200",
        textColor: "text-yellow-800",
        badgeColor: "bg-yellow-100 text-yellow-800",
      };
    case "confirmed":
      return {
        label: "Bestätigt",
        color: "green",
        icon: "✓",
        bgColor: "bg-green-50",
        borderColor: "border-green-200",
        textColor: "text-green-800",
        badgeColor: "bg-green-100 text-green-800",
      };
    case "cancelled":
      return {
        label: "Storniert",
        color: "red",
        icon: "✕",
        bgColor: "bg-red-50",
        borderColor: "border-red-200",
        textColor: "text-red-800",
        badgeColor: "bg-red-100 text-red-800",
      };
    case "completed":
      return {
        label: "Abgeschlossen",
        color: "gray",
        icon: "✓",
        bgColor: "bg-gray-50",
        borderColor: "border-gray-200",
        textColor: "text-gray-800",
        badgeColor: "bg-gray-100 text-gray-800",
      };
  }
}

export default function BookingStatusPage({ token }: BookingStatusPageProps) {
  const [showCancelConfirm, setShowCancelConfirm] = useState(false);
  const [isCancelling, setIsCancelling] = useState(false);
  const [cancellationResult, setCancellationResult] = useState<{ success: boolean; message: string; formattedDate?: string } | null>(null);

  // Fetch booking details
  const { data: booking, isLoading, error, refetch } = useQuery(
    queryClient.cancellation.getBookingByToken.queryOptions({ input: { token } })
  );

  // Cancellation mutation
  const cancelMutation = useMutation({
    ...queryClient.cancellation.cancelByToken.mutationOptions(),
    onSuccess: (result: any) => {
      setCancellationResult({
        success: true,
        message: result.message,
        formattedDate: result.formattedDate,
      });
      setIsCancelling(false);
      setShowCancelConfirm(false);
      refetch(); // Refresh booking data
    },
    onError: (error: any) => {
      setCancellationResult({
        success: false,
        message: error?.message || "Ein Fehler ist aufgetreten.",
      });
      setIsCancelling(false);
    },
  });

  const handleCancel = () => {
    setIsCancelling(true);
    setCancellationResult(null);
    cancelMutation.mutate({ token });
  };

  if (isLoading) {
    return (
      <div className="min-h-screen bg-gradient-to-br from-pink-50 to-purple-50 flex items-center justify-center p-4">
        <div className="bg-white p-8 rounded-lg shadow-lg max-w-2xl w-full">
          <div className="flex items-center justify-center">
            <div className="animate-spin rounded-full h-8 w-8 border-b-2 border-pink-500"></div>
            <span className="ml-3 text-gray-600">Buchung wird geladen...</span>
          </div>
        </div>
      </div>
    );
  }

  if (error) {
    return (
      <div className="min-h-screen bg-gradient-to-br from-pink-50 to-purple-50 flex items-center justify-center p-4">
        <div className="bg-white p-8 rounded-lg shadow-lg max-w-md w-full">
          <div className="text-center">
            <div className="w-16 h-16 mx-auto mb-4 bg-red-100 rounded-full flex items-center justify-center">
              <svg className="w-8 h-8 text-red-500" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
              </svg>
            </div>
            <h2 className="text-xl font-bold text-gray-900 mb-2">Fehler</h2>
            <p className="text-gray-600 mb-4">
              {error?.message || "Der Link ist ungültig oder abgelaufen."}
            </p>
            <a 
              href="/" 
              className="inline-flex items-center px-4 py-2 bg-pink-600 text-white rounded-lg hover:bg-pink-700 transition-colors"
            >
              Zur Startseite
            </a>
          </div>
        </div>
      </div>
    );
  }

  if (!booking) {
    return (
      <div className="min-h-screen bg-gradient-to-br from-pink-50 to-purple-50 flex items-center justify-center p-4">
        <div className="bg-white p-8 rounded-lg shadow-lg max-w-md w-full">
          <div className="text-center">
            <h2 className="text-xl font-bold text-gray-900 mb-2">Buchung nicht gefunden</h2>
            <p className="text-gray-600 mb-4">
              Die angeforderte Buchung konnte nicht gefunden werden.
            </p>
            <a 
              href="/" 
              className="inline-flex items-center px-4 py-2 bg-pink-600 text-white rounded-lg hover:bg-pink-700 transition-colors"
            >
              Zur Startseite
            </a>
          </div>
        </div>
      </div>
    );
  }

  const statusInfo = getStatusInfo(booking.status);

  return (
    <div className="min-h-screen bg-gradient-to-br from-pink-50 to-purple-50 py-8 px-4">
      <div className="max-w-2xl mx-auto">
        {/* Header */}
        <div className="bg-white rounded-lg shadow-lg p-6 mb-6">
          <div className="flex items-center justify-between mb-4">
            <img
              src="/assets/stargilnails_logo_transparent_112.png"
              alt="Stargil Nails Logo"
              className="w-16 h-16 object-contain"
            />
            <span className={`px-4 py-2 rounded-full text-sm font-semibold ${statusInfo.badgeColor}`}>
              {statusInfo.icon} {statusInfo.label}
            </span>
          </div>
          <h1 className="text-2xl font-bold text-gray-900">Buchungsübersicht</h1>
          <p className="text-gray-600 mt-1">Hier findest du alle Details zu deinem Termin</p>
        </div>

        {/* Cancellation Result */}
        {cancellationResult && (
          <div className={`mb-6 p-4 rounded-lg ${
            cancellationResult.success ? 'bg-green-50 border border-green-200' : 'bg-red-50 border border-red-200'
          }`}>
            <p className={cancellationResult.success ? 'text-green-800' : 'text-red-800'}>
              {cancellationResult.message}
              {cancellationResult.formattedDate && (
                <><br />Stornierter Termin: {cancellationResult.formattedDate}</>
              )}
            </p>
          </div>
        )}

        {/* Status Banner */}
        <div className={`${statusInfo.bgColor} border ${statusInfo.borderColor} rounded-lg p-6 mb-6`}>
          <div className="flex items-start">
            <div className={`text-4xl mr-4 ${statusInfo.textColor}`}>{statusInfo.icon}</div>
            <div className="flex-1">
              <h2 className={`text-xl font-bold ${statusInfo.textColor} mb-2`}>
                Status: {statusInfo.label}
              </h2>
              {booking.status === "pending" && (
                <p className={statusInfo.textColor}>
                  Wir haben deine Terminanfrage erhalten und werden sie in Kürze prüfen. Du erhältst eine E-Mail, sobald dein Termin bestätigt wurde.
                </p>
              )}
              {booking.status === "confirmed" && (
                <p className={statusInfo.textColor}>
                  Dein Termin wurde bestätigt! Wir freuen uns auf dich. Du hast eine Bestätigungs-E-Mail mit Kalendereintrag erhalten.
                </p>
              )}
              {booking.status === "cancelled" && (
                <p className={statusInfo.textColor}>
                  Dieser Termin wurde storniert. Du kannst jederzeit einen neuen Termin buchen.
                </p>
              )}
              {booking.status === "completed" && (
                <p className={statusInfo.textColor}>
                  Dieser Termin wurde erfolgreich abgeschlossen. Vielen Dank für deinen Besuch!
                </p>
              )}
            </div>
          </div>
        </div>

        {/* Appointment Details */}
        <div className="bg-white rounded-lg shadow-lg p-6 mb-6">
          <h2 className="text-lg font-semibold text-gray-900 mb-4 flex items-center">
            <svg className="w-5 h-5 mr-2 text-pink-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M8 7V3m8 4V3m-9 8h10M5 21h14a2 2 0 002-2V7a2 2 0 00-2-2H5a2 2 0 00-2 2v12a2 2 0 002 2z" />
            </svg>
            Termin-Details
          </h2>
          <div className="space-y-3">
            <div className="flex justify-between py-2 border-b border-gray-100">
              <span className="text-gray-600">Datum:</span>
              <span className="font-medium text-gray-900">{booking.formattedDate}</span>
            </div>
            <div className="flex justify-between py-2 border-b border-gray-100">
              <span className="text-gray-600">Uhrzeit:</span>
              <span className="font-medium text-gray-900">{booking.appointmentTime} Uhr</span>
            </div>
            <div className="flex justify-between py-2 border-b border-gray-100">
              <span className="text-gray-600">Behandlung:</span>
              <span className="font-medium text-gray-900">{booking.treatmentName}</span>
            </div>
            <div className="flex justify-between py-2 border-b border-gray-100">
              <span className="text-gray-600">Dauer:</span>
              <span className="font-medium text-gray-900">{booking.treatmentDuration} Minuten</span>
            </div>
            {booking.treatmentPrice > 0 && (
              <div className="flex justify-between py-2 border-b border-gray-100">
                <span className="text-gray-600">Preis:</span>
                <span className="font-medium text-gray-900">{booking.treatmentPrice.toFixed(2)} €</span>
              </div>
            )}
            {booking.hoursUntilAppointment > 0 && booking.status !== "cancelled" && booking.status !== "completed" && (
              <div className="flex justify-between py-2">
                <span className="text-gray-600">Verbleibende Zeit:</span>
                <span className="font-medium text-pink-600">
                  {booking.hoursUntilAppointment} Stunde{booking.hoursUntilAppointment !== 1 ? 'n' : ''}
                </span>
              </div>
            )}
          </div>
        </div>

        {/* Customer Details */}
        <div className="bg-white rounded-lg shadow-lg p-6 mb-6">
          <h2 className="text-lg font-semibold text-gray-900 mb-4 flex items-center">
            <svg className="w-5 h-5 mr-2 text-pink-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M16 7a4 4 0 11-8 0 4 4 0 018 0zM12 14a7 7 0 00-7 7h14a7 7 0 00-7-7z" />
            </svg>
            Deine Daten
          </h2>
          <div className="space-y-3">
            <div className="flex justify-between py-2 border-b border-gray-100">
              <span className="text-gray-600">Name:</span>
              <span className="font-medium text-gray-900">{booking.customerName}</span>
            </div>
            <div className="flex justify-between py-2 border-b border-gray-100">
              <span className="text-gray-600">E-Mail:</span>
              <span className="font-medium text-gray-900">{booking.customerEmail}</span>
            </div>
            <div className="flex justify-between py-2">
              <span className="text-gray-600">Telefon:</span>
              <span className="font-medium text-gray-900">{booking.customerPhone}</span>
            </div>
          </div>
          {booking.notes && (
            <div className="mt-4 pt-4 border-t border-gray-200">
              <h3 className="text-sm font-semibold text-gray-700 mb-2">Notizen:</h3>
              <p className="text-gray-600 text-sm">{booking.notes}</p>
            </div>
          )}
        </div>

        {/* Cancellation Section */}
        {booking.canCancel && !cancellationResult?.success && (
          <div className="bg-white rounded-lg shadow-lg p-6 mb-6">
            <h2 className="text-lg font-semibold text-gray-900 mb-4 flex items-center">
              <svg className="w-5 h-5 mr-2 text-red-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
              </svg>
              Termin stornieren
            </h2>
            
            {!showCancelConfirm ? (
              <div>
                <p className="text-gray-600 mb-4">
                  Du kannst diesen Termin noch bis {parseInt(process.env.MIN_STORNO_TIMESPAN || "24")} Stunden vor dem Termin kostenlos stornieren.
                </p>
                <button
                  onClick={() => setShowCancelConfirm(true)}
                  className="w-full bg-red-600 text-white py-3 px-4 rounded-lg font-medium hover:bg-red-700 transition-colors flex items-center justify-center"
                >
                  <svg className="w-5 h-5 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                    <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
                  </svg>
                  Termin stornieren
                </button>
              </div>
            ) : (
              <div>
                <div className="bg-red-50 border border-red-200 rounded-lg p-4 mb-4">
                  <p className="text-red-800 font-semibold mb-2">Bist du sicher?</p>
                  <p className="text-red-700 text-sm">
                    Diese Aktion kann nicht rückgängig gemacht werden. Der Termin wird storniert und der Slot wird wieder für andere Kunden verfügbar.
                  </p>
                </div>
                <div className="flex gap-3">
                  <button
                    onClick={handleCancel}
                    disabled={isCancelling}
                    className="flex-1 bg-red-600 text-white py-3 px-4 rounded-lg font-medium hover:bg-red-700 disabled:opacity-50 disabled:cursor-not-allowed transition-colors flex items-center justify-center"
                  >
                    {isCancelling ? (
                      <>
                        <div className="animate-spin rounded-full h-4 w-4 border-b-2 border-white mr-2"></div>
                        Storniere...
                      </>
                    ) : (
                      <>Ja, stornieren</>
                    )}
                  </button>
                  <button
                    onClick={() => setShowCancelConfirm(false)}
                    disabled={isCancelling}
                    className="flex-1 bg-gray-200 text-gray-800 py-3 px-4 rounded-lg font-medium hover:bg-gray-300 disabled:opacity-50 transition-colors"
                  >
                    Abbrechen
                  </button>
                </div>
              </div>
            )}
          </div>
        )}

        {!booking.canCancel && booking.status !== "cancelled" && booking.status !== "completed" && (
          <div className="bg-yellow-50 border border-yellow-200 rounded-lg p-4 mb-6">
            <p className="text-yellow-800 text-sm">
              <strong>ℹ️ Stornierungsfrist abgelaufen:</strong> Dieser Termin liegt weniger als {parseInt(process.env.MIN_STORNO_TIMESPAN || "24")} Stunden in der Zukunft und kann nicht mehr online storniert werden. Bitte kontaktiere uns direkt.
            </p>
          </div>
        )}

        {/* Footer */}
        <div className="text-center">
          <a 
            href="/" 
            className="inline-flex items-center text-pink-600 hover:text-pink-700 font-medium"
          >
            <svg className="w-5 h-5 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M10 19l-7-7m0 0l7-7m-7 7h18" />
            </svg>
            Zurück zur Startseite
          </a>
        </div>
      </div>
    </div>
  );
}