import { EnvironmentalImpact, TransportMethod } from '../../lib/transport/types';

interface CarbonFootprintCardProps {
  impact: EnvironmentalImpact;
  showComparison?: boolean;
}

const METHOD_LABELS: Record<TransportMethod, string> = {
  walking: 'Walking',
  bicycle: 'Bicycle',
  electric_vehicle: 'Electric Vehicle',
  hybrid_vehicle: 'Hybrid Vehicle',
  gasoline_vehicle: 'Gas Vehicle',
  diesel_truck: 'Diesel Truck',
  electric_truck: 'Electric Truck',
  refrigerated_truck: 'Refrigerated Truck',
  rail: 'Rail',
  ship: 'Ship',
  air: 'Air Freight',
  drone: 'Drone',
  local_delivery: 'Local Delivery',
  customer_pickup: 'Customer Pickup',
};

const METHOD_COLORS: Record<string, string> = {
  walking: 'bg-green-500',
  bicycle: 'bg-green-400',
  electric_vehicle: 'bg-emerald-400',
  hybrid_vehicle: 'bg-lime-400',
  electric_truck: 'bg-teal-400',
  drone: 'bg-cyan-400',
  rail: 'bg-blue-400',
  ship: 'bg-blue-500',
  local_delivery: 'bg-yellow-400',
  customer_pickup: 'bg-orange-400',
  gasoline_vehicle: 'bg-orange-500',
  diesel_truck: 'bg-red-400',
  refrigerated_truck: 'bg-red-500',
  air: 'bg-red-600',
};

export default function CarbonFootprintCard({ impact, showComparison = true }: CarbonFootprintCardProps) {
  // Calculate breakdown percentages
  const totalCarbon = impact.totalCarbonKg;
  const methodBreakdown = Object.entries(impact.breakdownByMethod)
    .filter(([_, data]) => data.carbon > 0)
    .sort((a, b) => b[1].carbon - a[1].carbon);

  const getCarbonRating = (carbon: number): { label: string; color: string; icon: string } => {
    if (carbon < 0.5) return { label: 'Excellent', color: 'text-green-600', icon: '🌟' };
    if (carbon < 2) return { label: 'Good', color: 'text-lime-600', icon: '✓' };
    if (carbon < 5) return { label: 'Moderate', color: 'text-yellow-600', icon: '⚡' };
    if (carbon < 10) return { label: 'High', color: 'text-orange-600', icon: '⚠️' };
    return { label: 'Very High', color: 'text-red-600', icon: '🚨' };
  };

  const rating = getCarbonRating(totalCarbon);

  return (
    <div className="bg-white rounded-lg shadow-lg overflow-hidden">
      {/* Header */}
      <div className="bg-gradient-to-r from-green-600 to-emerald-600 text-white p-6">
        <div className="flex items-center justify-between">
          <div>
            <h3 className="text-xl font-bold">Carbon Footprint</h3>
            <p className="text-green-100 text-sm mt-1">Environmental impact analysis</p>
          </div>
          <div className="text-right">
            <div className="text-3xl font-bold">{totalCarbon.toFixed(2)}</div>
            <div className="text-green-100 text-sm">kg CO2e</div>
          </div>
        </div>

        {/* Rating badge */}
        <div className="mt-4 inline-flex items-center px-3 py-1 bg-white bg-opacity-20 rounded-full">
          <span className="mr-2">{rating.icon}</span>
          <span className="font-semibold">{rating.label}</span>
        </div>
      </div>

      <div className="p-6 space-y-6">
        {/* Key metrics */}
        <div className="grid grid-cols-2 gap-4">
          <div className="p-4 bg-blue-50 rounded-lg">
            <p className="text-sm text-gray-600">Total Food Miles</p>
            <p className="text-2xl font-bold text-blue-600">{impact.totalFoodMiles.toFixed(1)}</p>
            <p className="text-xs text-gray-500">kilometers</p>
          </div>
          <div className="p-4 bg-green-50 rounded-lg">
            <p className="text-sm text-gray-600">Carbon Intensity</p>
            <p className="text-2xl font-bold text-green-600">
              {impact.carbonPerKgProduce.toFixed(3)}
            </p>
            <p className="text-xs text-gray-500">kg CO2 / kg produce</p>
          </div>
        </div>

        {/* Comparison with conventional */}
        {showComparison && impact.comparisonToConventional && (
          <div className="p-4 bg-gradient-to-r from-green-50 to-emerald-50 rounded-lg border border-green-200">
            <h4 className="font-semibold text-gray-900 mb-3 flex items-center">
              <span className="mr-2">📊</span>
              vs. Conventional Agriculture
            </h4>

            <div className="space-y-3">
              <div>
                <div className="flex justify-between text-sm mb-1">
                  <span className="text-gray-600">Carbon Saved</span>
                  <span className="font-semibold text-green-600">
                    {impact.comparisonToConventional.carbonSaved.toFixed(2)} kg
                  </span>
                </div>
                <div className="w-full bg-gray-200 rounded-full h-2">
                  <div
                    className="bg-green-500 h-2 rounded-full"
                    style={{
                      width: `${Math.min(impact.comparisonToConventional.percentageReduction, 100)}%`,
                    }}
                  ></div>
                </div>
              </div>

              <div>
                <div className="flex justify-between text-sm mb-1">
                  <span className="text-gray-600">Miles Saved</span>
                  <span className="font-semibold text-blue-600">
                    {impact.comparisonToConventional.milesSaved.toFixed(1)} km
                  </span>
                </div>
              </div>

              <div className="pt-2 border-t border-green-200 text-center">
                <span className="text-2xl font-bold text-green-600">
                  {impact.comparisonToConventional.percentageReduction.toFixed(0)}%
                </span>
                <span className="text-sm text-gray-600 ml-2">reduction vs conventional</span>
              </div>
            </div>
          </div>
        )}

        {/* Breakdown by transport method */}
        {methodBreakdown.length > 0 && (
          <div>
            <h4 className="font-semibold text-gray-900 mb-3">Breakdown by Transport Method</h4>
            <div className="space-y-2">
              {methodBreakdown.map(([method, data]) => {
                const percentage = totalCarbon > 0 ? (data.carbon / totalCarbon) * 100 : 0;
                return (
                  <div key={method} className="flex items-center">
                    <div className="w-32 text-sm text-gray-600 truncate">
                      {METHOD_LABELS[method as TransportMethod] || method}
                    </div>
                    <div className="flex-1 mx-3">
                      <div className="w-full bg-gray-200 rounded-full h-4">
                        <div
                          className={`${METHOD_COLORS[method] || 'bg-gray-400'} h-4 rounded-full transition-all`}
                          style={{ width: `${percentage}%` }}
                        ></div>
                      </div>
                    </div>
                    <div className="w-24 text-right text-sm">
                      <span className="font-medium text-gray-900">{data.carbon.toFixed(3)} kg</span>
                      <span className="text-gray-500 ml-1">({percentage.toFixed(0)}%)</span>
                    </div>
                  </div>
                );
              })}
            </div>
          </div>
        )}

        {/* Tips */}
        <div className="bg-yellow-50 border border-yellow-200 rounded-lg p-4">
          <h4 className="font-semibold text-yellow-800 mb-2">Tips to Reduce Impact</h4>
          <ul className="text-sm text-yellow-700 space-y-1">
            {totalCarbon > 5 && (
              <li>• Consider electric or hybrid vehicles for transport</li>
            )}
            {impact.totalFoodMiles > 50 && (
              <li>• Source produce from closer locations when possible</li>
            )}
            <li>• Consolidate shipments to reduce trips</li>
            <li>• Use bicycle delivery for short distances</li>
          </ul>
        </div>
      </div>
    </div>
  );
}