'use client';

import { useState, useCallback } from 'react';
import { Button } from '@/components/ui/Button';
import { comparePrices, type PriceCompareResponse, type ComparableListing } from '@/lib/retouch';

interface PriceComparisonProps {
  vehicleId?: string;
}

export function PriceComparison({ vehicleId }: PriceComparisonProps) {
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const [data, setData] = useState<PriceCompareResponse | null>(null);
  const [inputVehicleId, setInputVehicleId] = useState(vehicleId || '');

  const handleCompare = useCallback(async () => {
    const vid = inputVehicleId.trim();
    if (!vid) {
      setError('Please enter a vehicle ID');
      return;
    }
    setLoading(true);
    setError(null);
    try {
      const result = await comparePrices(vid);
      setData(result);
    } catch (err: unknown) {
      const apiErr = err as { error?: { message?: string } };
      setError(apiErr?.error?.message || 'Price comparison failed');
      setData(null);
    } finally {
      setLoading(false);
    }
  }, [inputVehicleId]);

  const formatPrice = (price: number) => {
    return new Intl.NumberFormat('de-DE', {
      style: 'currency',
      currency: 'EUR',
      maximumFractionDigits: 0,
    }).format(price);
  };

  return (
    <div data-testid="price-comparison" className="space-y-4">
      <div className="flex gap-2 items-end">
        <div className="flex-1">
          <label className="block text-sm font-medium text-text mb-1">
            Vehicle ID
          </label>
          <input
            type="text"
            value={inputVehicleId}
            onChange={(e) => setInputVehicleId(e.target.value)}
            placeholder="Enter vehicle UUID"
            className="w-full px-3 py-2 border border-border rounded-lg text-text focus:outline-none focus:ring-2 focus:ring-primary"
            data-testid="price-compare-vehicle-input"
          />
        </div>
        <Button
          onClick={handleCompare}
          loading={loading}
          data-testid="price-compare-button"
        >
          Compare Prices
        </Button>
      </div>

      {error && (
        <div data-testid="price-compare-error" className="p-4 bg-error/10 text-error rounded-lg">
          {error}
        </div>
      )}

      {loading && (
        <div data-testid="price-compare-loading" className="text-center text-text-muted py-4">
          Searching comparable listings...
        </div>
      )}

      {data && !loading && (
        <div data-testid="price-compare-results" className="space-y-4">
          {/* Summary */}
          <div className="flex items-center justify-between p-4 bg-primary/5 rounded-lg">
            <div>
              <p className="text-sm text-text-muted">Comparable Listings</p>
              <p className="text-2xl font-bold text-text">{data.listing_count}</p>
            </div>
            <div className="text-right">
              <p className="text-sm text-text-muted">Average Price</p>
              <p className="text-2xl font-bold text-primary">
                {data.average_price !== null ? formatPrice(data.average_price) : 'N/A'}
              </p>
            </div>
          </div>

          {/* Listings table */}
          {data.comparable_listings.length > 0 ? (
            <div className="overflow-x-auto">
              <table className="w-full text-sm border border-border rounded-lg">
                <thead className="bg-secondary/10">
                  <tr>
                    <th className="px-4 py-2 text-left text-text font-medium">Title</th>
                    <th className="px-4 py-2 text-right text-text font-medium">Price</th>
                    <th className="px-4 py-2 text-right text-text font-medium">Mileage</th>
                    <th className="px-4 py-2 text-left text-text font-medium">Location</th>
                    <th className="px-4 py-2 text-left text-text font-medium">Source</th>
                  </tr>
                </thead>
                <tbody>
                  {data.comparable_listings.map((listing: ComparableListing, idx: number) => (
                    <tr
                      key={idx}
                      className="border-t border-border hover:bg-secondary/5"
                      data-testid={`price-compare-row-${idx}`}
                    >
                      <td className="px-4 py-2 text-text">
                        {listing.url ? (
                          <a
                            href={listing.url}
                            target="_blank"
                            rel="noopener noreferrer"
                            className="text-primary hover:underline"
                          >
                            {listing.title}
                          </a>
                        ) : (
                          listing.title
                        )}
                      </td>
                      <td className="px-4 py-2 text-right text-text font-medium">
                        {formatPrice(listing.price)}
                      </td>
                      <td className="px-4 py-2 text-right text-text-muted">
                        {listing.mileage_km !== null && listing.mileage_km !== undefined
                          ? `${listing.mileage_km.toLocaleString('de-DE')} km`
                          : '-'}
                      </td>
                      <td className="px-4 py-2 text-text-muted">
                        {listing.location || '-'}
                      </td>
                      <td className="px-4 py-2 text-text-muted">
                        {listing.source}
                      </td>
                    </tr>
                  ))}
                </tbody>
              </table>
            </div>
          ) : (
            <div data-testid="price-compare-empty" className="text-center text-text-muted py-8">
              No comparable listings found.
            </div>
          )}
        </div>
      )}
    </div>
  );
}