'use client';

import { useState, useEffect, useCallback } from 'react';
import { useRouter } from 'next/navigation';
import { Button } from '@/components/ui/Button';
import {
  getVehicle,
  deleteVehicle,
  type VehicleResponse,
} from '@/lib/vehicles';
import { MobileDeStatus } from './MobileDeStatus';

interface VehicleDetailProps {
  vehicleId: string;
}

function formatPrice(price: number): string {
  return new Intl.NumberFormat('de-DE', { style: 'currency', currency: 'EUR' }).format(price);
}

function formatDate(dateStr?: string): string {
  if (!dateStr) return '—';
  return new Date(dateStr).toLocaleDateString('de-DE');
}

export function VehicleDetail({ vehicleId }: VehicleDetailProps) {
  const router = useRouter();
  const [vehicle, setVehicle] = useState<VehicleResponse | null>(null);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);

  const fetchVehicle = useCallback(async () => {
    setLoading(true);
    setError(null);
    try {
      const data = await getVehicle(vehicleId);
      setVehicle(data);
    } catch (err: unknown) {
      const apiErr = err as { error?: { message?: string } };
      setError(apiErr?.error?.message || 'Failed to load vehicle');
    } finally {
      setLoading(false);
    }
  }, [vehicleId]);

  useEffect(() => {
    fetchVehicle();
  }, [fetchVehicle]);

  const handleDelete = async () => {
    if (!vehicle) return;
    if (!confirm('Delete this vehicle?')) return;
    try {
      await deleteVehicle(vehicle.id);
      router.push('/de/fahrzeuge');
    } catch (err: unknown) {
      const apiErr = err as { error?: { message?: string } };
      setError(apiErr?.error?.message || 'Failed to delete vehicle');
    }
  };

  if (loading) {
    return (
      <div data-testid="vehicle-detail-loading" className="text-center py-8 text-text-muted">
        Loading vehicle...
      </div>
    );
  }

  if (error) {
    return (
      <div data-testid="vehicle-detail-error" className="p-4 bg-error/10 text-error rounded-lg">
        {error}
      </div>
    );
  }

  if (!vehicle) {
    return (
      <div data-testid="vehicle-detail-not-found" className="text-center py-8 text-text-muted">
        Vehicle not found
      </div>
    );
  }

  const fields: { label: string; value: string | number | undefined | null }[] = [
    { label: 'Make', value: vehicle.make },
    { label: 'Model', value: vehicle.model },
    { label: 'FIN', value: vehicle.fin },
    { label: 'Year', value: vehicle.year },
    { label: 'First Registration', value: formatDate(vehicle.first_registration) },
    { label: 'Power (kW)', value: vehicle.power_kw },
    { label: 'Power (HP)', value: vehicle.power_hp },
    { label: 'Fuel Type', value: vehicle.fuel_type },
    { label: 'Transmission', value: vehicle.transmission },
    { label: 'Color', value: vehicle.color },
    { label: 'Condition', value: vehicle.condition },
    { label: 'Location', value: vehicle.location },
    { label: 'Availability', value: vehicle.availability },
    { label: 'Price', value: formatPrice(vehicle.price) },
    { label: 'Vehicle Type', value: vehicle.vehicle_type },
    { label: 'LKW Type', value: vehicle.lkw_type },
    { label: 'Machine Type', value: vehicle.machine_type },
    { label: 'Body Type', value: vehicle.body_type },
    { label: 'Operating Hours', value: vehicle.operating_hours },
    { label: 'Operating Hours Unit', value: vehicle.operating_hours_unit },
    { label: 'Mileage (km)', value: vehicle.mileage_km },
    { label: 'Description', value: vehicle.description },
    { label: 'Created At', value: formatDate(vehicle.created_at) },
    { label: 'Updated At', value: formatDate(vehicle.updated_at) },
  ];

  return (
    <div data-testid="vehicle-detail" className="space-y-6">
      <div className="flex items-center justify-between">
        <h1 data-testid="vehicle-detail-title" className="text-2xl font-bold text-text">
          {vehicle.make} {vehicle.model}
        </h1>
        <div className="flex gap-2">
          <Button variant="secondary" onClick={() => router.push(`/de/fahrzeuge/${vehicle.id}/bearbeiten`)}>
            Edit
          </Button>
          <Button variant="danger" onClick={handleDelete} data-testid="delete-button">
            Delete
          </Button>
        </div>
      </div>

      <div data-testid="vehicle-detail-fields" className="grid grid-cols-2 md:grid-cols-3 gap-4 p-6 bg-surface rounded-lg border border-border">
        {fields.map(field => (
          <div key={field.label} className="space-y-1">
            <dt className="text-sm font-medium text-text-muted">{field.label}</dt>
            <dd data-testid={`field-${field.label.toLowerCase().replace(/\s+/g, '_')}`} className="text-text">
              {field.value !== null && field.value !== undefined && field.value !== '' ? field.value : '—'}
            </dd>
          </div>
        ))}
      </div>

      <MobileDeStatus vehicleId={vehicle.id} />
    </div>
  );
}