Country.swift

/// Copyright (c) 2020 Razeware LLC
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import Foundation

struct Country: Decodable {
  let name: String
  let continent: Continent
  let region: String
  let population: Int
  let year: Year
  
  enum CodingKeys: String, CodingKey {
    case name = "country"
    case continent, region, population, year
  }
}

// MARK: -

extension Country {
  static func countries() -> [Continent: [Country]] {
    guard
      let url = Bundle.main.url(forResource: "population", withExtension: "json"),
      let data = try? Data(contentsOf: url)
      else {
        return [:]
    }
    
    do {
      let countries = try JSONDecoder().decode([Country].self, from: data)
      var countriesByContient: [Continent: [Country]] = [:]
      Continent.allCases.forEach { (continent) in
        countriesByContient[continent] = countries.filter {
          $0.continent == continent
        }
      }
      return countriesByContient
    } catch {
      print(error.localizedDescription)
      return [:]
    }
  }
  
  var formattedPopulation: String? {
    return NSNumber(value: self.population).formatted()
  }
}