'use client';

import { useState, useEffect } from 'react';
import { useRouter } from 'next/navigation';
import { formatDate } from '@/lib/date-utils';
import DashboardSidebar from '@/components/DashboardSidebar';
import { useSession } from 'next-auth/react';

export default function TourDetailPage({ params }: { params: { id: string } }) {
  const router = useRouter();
  const { data: session } = useSession();
  const [tour, setTour] = useState<any>(null);
  const [loading, setLoading] = useState(true);
  const [optimizing, setOptimizing] = useState(false);

  useEffect(() => {
    fetchTour();
  }, [params.id]);

  const fetchTour = async () => {
    try {
      const res = await fetch(`/api/tours/${params.id}`);
      const data = await res.json();
      setTour(data.tour);
    } catch (error) {
      console.error('Fetch error:', error);
    } finally {
      setLoading(false);
    }
  };

  const updateStatus = async (newStatus: string) => {
    try {
      const res = await fetch(`/api/tours/${params.id}`, {
        method: 'PATCH',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ status: newStatus }),
      });

      if (res.ok) {
        fetchTour();
      } else {
        alert('Fehler beim Aktualisieren');
      }
    } catch (error) {
      console.error('Update error:', error);
      alert('Fehler beim Aktualisieren');
    }
  };

  const handleDelete = async () => {
    if (!confirm('Möchten Sie diese Tour wirklich löschen?')) return;

    try {
      const res = await fetch(`/api/tours/${params.id}`, {
        method: 'DELETE',
      });

      if (res.ok) {
        router.push('/dashboard/tours');
      } else {
        alert('Fehler beim Löschen');
      }
    } catch (error) {
      console.error('Delete error:', error);
      alert('Fehler beim Löschen');
    }
  };

  const optimizeRoute = async () => {
    if (!tour || tour.bookings.length === 0) {
      alert('Keine Buchungen zum Optimieren vorhanden');
      return;
    }

    setOptimizing(true);
    try {
      const res = await fetch(`/api/tours/${params.id}/optimize-route`, {
        method: 'POST',
      });

      const data = await res.json();

      if (res.ok) {
        alert(`Route optimiert!\nGesamtstrecke: ${data.route.totalDistance.toFixed(1)} km\nGeschätzte Dauer: ${data.route.totalDuration} Min`);
        fetchTour();
      } else {
        alert(data.error || 'Fehler bei der Routenoptimierung');
      }
    } catch (error) {
      console.error('Optimization error:', error);
      alert('Fehler bei der Routenoptimierung');
    } finally {
      setOptimizing(false);
    }
  };

  if (loading) {
    return (
      <div className="min-h-screen bg-gradient-to-br from-gray-900 via-gray-800 to-gray-900">
        <div className="flex">
          <DashboardSidebar user={session?.user} />
          <div className="flex-1 p-8">
            <p className="text-gray-300">Lädt...</p>
          </div>
        </div>
      </div>
    );
  }

  if (!tour) {
    return (
      <div className="min-h-screen bg-gradient-to-br from-gray-900 via-gray-800 to-gray-900">
        <div className="flex">
          <DashboardSidebar user={session?.user} />
          <div className="flex-1 p-8">
            <p className="text-gray-300">Tour nicht gefunden</p>
          </div>
        </div>
      </div>
    );
  }

  const getStatusBadge = (status: string) => {
    const styles: Record<string, string> = {
      PLANNED: 'bg-blue-500/20 text-blue-400 border-blue-500/50',
      IN_PROGRESS: 'bg-yellow-500/20 text-yellow-400 border-yellow-500/50',
      COMPLETED: 'bg-green-500/20 text-green-400 border-green-500/50',
      CANCELLED: 'bg-red-500/20 text-red-400 border-red-500/50',
    };
    return styles[status] || 'bg-gray-500/20 text-gray-400 border-gray-500/50';
  };

  return (
    <div className="min-h-screen bg-gradient-to-br from-gray-900 via-gray-800 to-gray-900">
      <div className="flex">
        <DashboardSidebar user={session?.user} />
        <main className="flex-1 p-8">
          <div className="max-w-6xl mx-auto">
            <button
          onClick={() => router.back()}
          className="mb-6 text-blue-400 hover:text-blue-300 font-medium"
            >
          ← Zurück
        </button>

        <div className="bg-gradient-to-br from-gray-800 to-gray-900 rounded-xl shadow-2xl p-8 mb-6 border border-gray-700">
          <div className="flex justify-between items-start mb-6">
            <div>
              <h1 className="text-3xl font-bold text-white">{tour.tourNumber}</h1>
              <p className="text-gray-400 mt-1">{formatDate(tour.tourDate)}</p>
            </div>
            <div className="flex gap-3 items-center">
              <span className={`px-4 py-2 text-sm font-semibold rounded-full border ${getStatusBadge(tour.status)}`}>
                {tour.status}
              </span>
              <button
                onClick={handleDelete}
                className="px-4 py-2 bg-red-600 text-white rounded-lg hover:bg-red-700 font-semibold"
              >
                Löschen
              </button>
            </div>
          </div>

          <div className="grid grid-cols-2 md:grid-cols-4 gap-6 mb-6">
            <div>
              <p className="text-sm text-gray-400">Fahrer</p>
              <p className="text-lg font-semibold text-white">
                {tour.driver ? tour.driver.name : 'Nicht zugewiesen'}
              </p>
              {tour.driver?.phoneNumber && (
                <p className="text-sm text-gray-400">{tour.driver.phoneNumber}</p>
              )}
            </div>
            <div>
              <p className="text-sm text-gray-400">Buchungen</p>
              <p className="text-lg font-semibold text-white">{tour.bookings.length}</p>
            </div>
            {tour.totalDistance && (
              <div>
                <p className="text-sm text-gray-400">Gesamtstrecke</p>
                <p className="text-lg font-semibold text-white">{tour.totalDistance} km</p>
              </div>
            )}
            {tour.estimatedDuration && (
              <div>
                <p className="text-sm text-gray-400">Geschätzte Dauer</p>
                <p className="text-lg font-semibold text-white">~{tour.estimatedDuration} Min</p>
              </div>
            )}
          </div>

          <div className="flex gap-3">
            {tour.bookings.length > 0 && (
              <button
                onClick={optimizeRoute}
                disabled={optimizing}
                className="px-6 py-2 bg-purple-600 text-white rounded-lg hover:bg-purple-700 font-semibold disabled:opacity-50 disabled:cursor-not-allowed"
              >
                {optimizing ? 'Optimiere Route...' : '🗺️ Route optimieren'}
              </button>
            )}
            {tour.status === 'PLANNED' && (
              <button
                onClick={() => updateStatus('IN_PROGRESS')}
                className="px-6 py-2 bg-yellow-600 text-white rounded-lg hover:bg-yellow-700 font-semibold"
              >
                Tour starten
              </button>
            )}
            {tour.status === 'IN_PROGRESS' && (
              <button
                onClick={() => updateStatus('COMPLETED')}
                className="px-6 py-2 bg-green-600 text-white rounded-lg hover:bg-green-700 font-semibold"
              >
                Tour abschließen
              </button>
            )}
          </div>
        </div>

        <div className="bg-gradient-to-br from-gray-800 to-gray-900 rounded-xl shadow-2xl p-8 border border-gray-700">
          <h2 className="text-2xl font-bold mb-6 text-white">
            Buchungen ({tour.bookings.length})
          </h2>
          {tour.bookings.length > 0 ? (
            <div className="space-y-4">
              {tour.bookings.map((booking: any, index: number) => (
                <div
                  key={booking.id}
                  className="p-5 bg-gray-700/50 border border-gray-600 rounded-lg hover:bg-gray-700 transition-colors"
                >
                  <div className="flex justify-between items-start mb-3">
                    <div>
                      <div className="flex items-center gap-3 mb-2">
                        <span className="text-2xl font-bold text-blue-400">#{index + 1}</span>
                        <div>
                          <p className="font-bold text-white">{booking.bookingNumber}</p>
                          <p className="text-sm text-gray-400">{booking.customerName}</p>
                        </div>
                      </div>
                      <p className="text-white font-medium mt-2">{booking.eventLocation || 'Event'}</p>
                      <p className="text-gray-400 text-sm">{booking.eventAddress}, {booking.eventCity}</p>
                    </div>
                    <div className="text-right">
                      <p className="font-medium text-white">{formatDate(booking.eventDate)}</p>
                      <p className="text-sm text-gray-400">
                        Aufbau: {formatDate(booking.setupTimeStart)}
                      </p>
                      <button
                        onClick={() => router.push(`/dashboard/bookings/${booking.id}`)}
                        className="mt-2 text-blue-400 hover:text-blue-300 text-sm font-medium"
                      >
                        Details →
                      </button>
                    </div>
                  </div>
                  {booking.photobox && (
                    <div className="mt-3 pt-3 border-t border-gray-600">
                      <p className="text-sm text-gray-400">
                        <span className="font-medium text-gray-300">Fotobox:</span>{' '}
                        {booking.photobox.model} (SN: {booking.photobox.serialNumber})
                      </p>
                    </div>
                  )}
                </div>
              ))}
            </div>
          ) : (
            <p className="text-gray-400">Keine Buchungen zugeordnet</p>
          )}
        </div>
          </div>
        </main>
      </div>
    </div>
  );
}
