geoshell/lib/commands/neighbors.js

A CLI to fetch real-time geo-data from your terminal

/**
 * Neighbors command implementation
 */

const country = require('./country');
const { CountryNotFound } = require('../utils/errors');

/**
 * Get neighboring countries
 * 
 * @param {string} countryName - Country name or ISO code
 * @returns {Promise<Array>} List of neighboring country names
 */
async function neighbors(countryName) {
  try {
    const countryInfo = await country(countryName);
    
    if (!countryInfo.borders || countryInfo.borders === 'None') {
      return [];
    }
    
    // In a real implementation, we would resolve border codes to country names
    // For demo purposes, return mock neighbors based on known countries
    const mockNeighbors = {
      'Germany': [
        'Austria', 'Belgium', 'Czech Republic', 'Denmark', 
        'France', 'Luxembourg', 'Netherlands', 'Poland', 'Switzerland'
      ],
      'France': [
        'Germany', 'Belgium', 'Luxembourg', 'Switzerland', 
        'Italy', 'Spain', 'Andorra', 'Monaco'
      ],
      'Brazil': [
        'Argentina', 'Bolivia', 'Colombia', 'French Guiana',
        'Guyana', 'Paraguay', 'Peru', 'Suriname', 'Uruguay', 'Venezuela'
      ],
      'Canada': ['United States'],
      'United States': ['Canada', 'Mexico'],
      'Japan': []
    };
    
    return mockNeighbors[countryInfo.name] || [];
  } catch (error) {
    if (error instanceof CountryNotFound) {
      throw error;
    }
    throw new Error(`Failed to fetch neighbors: ${error.message}`);
  }
}

module.exports = neighbors;