import React, { useMemo, useState } from 'react';
import { Property } from '../../types';
import { formatDuration, formatAge, formatNumber } from '../../lib/format';
import { getNum } from '../../lib/property-fields';
import InfoPopup from '../ui/InfoPopup';
import { SearchInput } from '../ui/SearchInput';
import { EmptyState } from '../ui/EmptyState';
import { InfoIcon } from '../ui/icons';

interface PropertiesPaneProps {
  properties: Property[];
  total: number;
  loading: boolean;
  hexagonId: string | null;
  onLoadMore: () => void;
  onClose: () => void;
  onNavigateToSource?: (slug: string) => void;
}

export function PropertiesPane({
  properties,
  total,
  loading,
  hexagonId,
  onLoadMore,
  onClose,
  onNavigateToSource,
}: PropertiesPaneProps) {
  const [search, setSearch] = useState('');
  const [showInfo, setShowInfo] = useState(false);

  const filtered = useMemo(() => {
    const query = search.trim().toLowerCase();
    return query
      ? properties.filter((p) => {
          const addr = (p.address || '').toLowerCase();
          const pc = (p.postcode || '').toLowerCase();
          return addr.includes(query) || pc.includes(query);
        })
      : properties;
  }, [properties, search]);

  if (!hexagonId) {
    return (
      <EmptyState
        icon={<InfoIcon className="w-8 h-8 text-warm-300 dark:text-warm-600" />}
        title="No area selected"
        description="Click a hexagon or postcode to view area statistics"
        centered
      />
    );
  }

  return (
    <div className="flex flex-col h-full">
      {showInfo && (
        <InfoPopup
          title="Property Data"
          onClose={() => setShowInfo(false)}
          sourceLink={
            onNavigateToSource
              ? {
                  label: 'View data source',
                  onClick: () => {
                    onNavigateToSource('epc');
                    setShowInfo(false);
                  },
                }
              : undefined
          }
        >
          <p className="text-sm text-warm-700 dark:text-warm-300 mb-4 leading-relaxed">
            Property data combines Energy Performance Certificates (EPC) with HM Land Registry
            Price Paid records, fuzzy-matched by address within each postcode. Includes floor
            area, energy ratings, construction age, and tenure from EPC surveys, plus the most
            recent sale price from the Land Registry.
          </p>
        </InfoPopup>
      )}

      <div className="p-2 border-b border-warm-200 dark:border-navy-700">
        <SearchInput
          value={search}
          onChange={setSearch}
          placeholder="Search by address or postcode..."
          className="p-2"
        />
      </div>

      <div className="flex-1 overflow-y-auto">
        {loading && properties.length === 0 ? (
          <div className="p-4 dark:text-warm-400">Loading...</div>
        ) : (
          <>
            {filtered.map((property, idx) => (
              <PropertyCard key={idx} property={property} />
            ))}
            {properties.length < total && (
              <button
                onClick={onLoadMore}
                disabled={loading}
                className="w-full p-4 text-teal-600 dark:text-teal-400 hover:bg-teal-50 dark:hover:bg-teal-900/30 disabled:opacity-50"
              >
                {loading ? 'Loading...' : `Load More (${total - properties.length} remaining)`}
              </button>
            )}
          </>
        )}
      </div>
    </div>
  );
}

function PropertyCard({ property }: { property: Property }) {
  const price = getNum(property, 'Last known price', 'latest_price');
  const pricePerSqm = getNum(property, 'Price per sqm', 'price_per_sqm');
  const floorArea = getNum(property, 'Total floor area (sqm)', 'total_floor_area');
  const rooms = getNum(
    property,
    'Rooms (including bedrooms & bathrooms)',
    'number_habitable_rooms'
  );
  const age = getNum(property, 'Approximate construction age', 'construction_age_band');
  const councilTax = getNum(property, 'Council tax (£/yr)');
  const councilTaxD = getNum(property, 'Council tax Band D (£/yr)');

  return (
    <div className="p-4 border-b border-warm-100 dark:border-navy-800 hover:bg-warm-50 dark:hover:bg-navy-800">
      <div className="font-semibold dark:text-warm-100">
        {property.address || 'Unknown Address'}
      </div>
      <div className="text-sm text-warm-600 dark:text-warm-400">{property.postcode}</div>

      {price !== undefined && (
        <div className="mt-2 text-lg font-bold text-teal-700 dark:text-teal-400">
          £{formatNumber(price)}
          {pricePerSqm !== undefined && (
            <span className="text-sm font-normal text-warm-600 dark:text-warm-400">
              {' '}
              (£{formatNumber(pricePerSqm)}/m²)
            </span>
          )}
        </div>
      )}

      <div className="mt-2 grid grid-cols-2 gap-x-4 gap-y-1 text-sm dark:text-warm-300">
        {property.property_type && (
          <div>
            <span className="text-warm-500 dark:text-warm-400">Type:</span> {property.property_type}
          </div>
        )}
        {property.built_form && (
          <div>
            <span className="text-warm-500 dark:text-warm-400">Built form:</span>{' '}
            {property.built_form}
          </div>
        )}
        {property.duration && (
          <div>
            <span className="text-warm-500 dark:text-warm-400">Tenure:</span>{' '}
            {formatDuration(property.duration)}
          </div>
        )}
        {floorArea !== undefined && (
          <div>
            <span className="text-warm-500 dark:text-warm-400">Floor area:</span> {formatNumber(floorArea)}m²
          </div>
        )}
        {rooms !== undefined && (
          <div>
            <span className="text-warm-500 dark:text-warm-400">Rooms:</span> {formatNumber(rooms)}
          </div>
        )}
        {age !== undefined && (
          <div>
            <span className="text-warm-500 dark:text-warm-400">Built:</span>{' '}
            {formatAge(age, property.is_construction_date_approximate ?? true)}
          </div>
        )}
        {property.current_energy_rating && (
          <div>
            <span className="text-warm-500 dark:text-warm-400">EPC rating:</span>{' '}
            {property.current_energy_rating}
          </div>
        )}
        {property.potential_energy_rating && (
          <div>
            <span className="text-warm-500 dark:text-warm-400">EPC potential:</span>{' '}
            {property.potential_energy_rating}
          </div>
        )}
        {councilTax !== undefined ? (
          <div>
            <span className="text-warm-500 dark:text-warm-400">Council tax:</span> £
            {formatNumber(councilTax)}/yr
          </div>
        ) : councilTaxD !== undefined ? (
          <div>
            <span className="text-warm-500 dark:text-warm-400">Council tax (D):</span> £
            {formatNumber(councilTaxD)}/yr
          </div>
        ) : null}
      </div>
    </div>
  );
}
