AnalyticsEvent.swift

public enum AnalyticsEvent: AnalyticsEventProtocol {
    case userLoggedIn
    case userLoggedOut
    case productSelected(productId: Int)

    var name: String { 
        switch self {
        case .userLoggedIn:     return "User Logged In"
        case .userLoggedOut:    return "User Logged Out"
        case .productSelected:  return "Product Selected"
        }
    }

    /// The parameters before used the AnalyticsEventProtocol's default implementation which 
    /// always returned nil. Now we just have to create our own implementation based on the
    /// cases of this enum.
    var parameters: [String: Any]? {
        switch self {
        case .userLoggedIn:                 return nil
        case .userLoggedOut:                return nil
        case .productSelected(id: let id):  return ["product_id": productId]
        }
    }
}