ColourViewModel+Request.swift

private extension ColourViewModel {
  
  struct Request: Codable {
    let input: [Input]?
    let model: String?
  }
  
  enum Input: Codable {
    static let unknown: Input = .string("N")
    
    case integerArray([Int])
    case string(String)
    
    init(from decoder: Decoder) throws {
      let container = try decoder.singleValueContainer()
      if let intValue = try? container.decode([Int].self) {
        self = .integerArray(intValue)
        return
      }
      if let stringValue = try? container.decode(String.self) {
        self = .string(stringValue)
        return
      }
      let decodingContext = DecodingError
        .Context(codingPath: decoder.codingPath, debugDescription: "Wrong type")
      throw DecodingError.typeMismatch(Input.self, decodingContext)
    }
    
    func encode(to encoder: Encoder) throws {
      var container = encoder.singleValueContainer()
      switch self {
      case .integerArray(let intValue): try container.encode(intValue)
      case .string(let stringValue): try container.encode(stringValue)
      }
    }
  }
}