import { useQuery } from '@tanstack/react-query';

export interface BTCMapMerchant {
  id: string;
  name: string;
  lat: number;
  lon: number;
  tags: {
    name?: string;
    'payment:lightning'?: string;
    'payment:onchain'?: string;
    'payment:lightning_contactless'?: string;
    amenity?: string;
    shop?: string;
    cuisine?: string;
    opening_hours?: string;
    website?: string;
    phone?: string;
  };
  osm_json?: {
    type: string;
    id: number;
  };
}

/**
 * Fetch Bitcoin-accepting merchants from BTCMap API
 * Uses bounding box to get merchants in the visible map area
 */
export function useBTCMap(bounds?: { 
  north: number; 
  south: number; 
  east: number; 
  west: number;
}, enabled: boolean = false) {
  return useQuery({
    queryKey: ['btcmap', bounds?.north, bounds?.south, bounds?.east, bounds?.west],
    queryFn: async ({ signal }): Promise<BTCMapMerchant[]> => {
      if (!bounds) return [];

      // BTCMap API endpoint - get elements in bounding box
      // Using their public API
      const url = `https://api.btcmap.org/v2/elements?updated_since=2020-01-01&bounds=${bounds.south},${bounds.west},${bounds.north},${bounds.east}`;
      
      const response = await fetch(url, { 
        signal,
        headers: {
          'Accept': 'application/json',
        }
      });

      if (!response.ok) {
        throw new Error(`BTCMap API error: ${response.status}`);
      }

      const data = await response.json();
      
      // Transform the response to our format
      const merchants: BTCMapMerchant[] = data
        .filter((item: { 'osm_json': { lat?: number; lon?: number }; deleted_at?: string }) => 
          item.osm_json?.lat && item.osm_json?.lon && !item.deleted_at
        )
        .map((item: { 
          id: string; 
          'osm_json': { 
            lat: number; 
            lon: number; 
            tags?: Record<string, string>;
            type?: string;
            id?: number;
          } 
        }) => ({
          id: item.id,
          name: item.osm_json.tags?.name || 'Bitcoin Merchant',
          lat: item.osm_json.lat,
          lon: item.osm_json.lon,
          tags: item.osm_json.tags || {},
          osm_json: {
            type: item.osm_json.type || 'node',
            id: item.osm_json.id || 0,
          }
        }));

      return merchants;
    },
    enabled: enabled && !!bounds,
    staleTime: 5 * 60 * 1000, // 5 minutes
    gcTime: 30 * 60 * 1000, // 30 minutes
  });
}

/**
 * Get a human-readable category for the merchant
 */
export function getMerchantCategory(merchant: BTCMapMerchant): string {
  const { tags } = merchant;
  
  if (tags.amenity === 'cafe' || tags.amenity === 'coffee') return '☕ Café';
  if (tags.amenity === 'restaurant') return '🍽️ Restaurant';
  if (tags.amenity === 'bar' || tags.amenity === 'pub') return '🍺 Bar';
  if (tags.amenity === 'fast_food') return '🍔 Fast Food';
  if (tags.shop === 'convenience') return '🏪 Convenience';
  if (tags.shop === 'supermarket') return '🛒 Supermarket';
  if (tags.shop === 'clothes') return '👕 Clothing';
  if (tags.shop === 'sports') return '⚽ Sports';
  if (tags.shop === 'electronics') return '📱 Electronics';
  if (tags.shop) return '🏬 Shop';
  if (tags.amenity === 'atm') return '🏧 ATM';
  if (tags.amenity === 'bank') return '🏦 Bank';
  
  return '₿ Bitcoin Accepted';
}

/**
 * Check if merchant accepts Lightning
 */
export function acceptsLightning(merchant: BTCMapMerchant): boolean {
  const { tags } = merchant;
  return tags['payment:lightning'] === 'yes' || 
         tags['payment:lightning_contactless'] === 'yes';
}