Analytics system contract

Analytics.swift

public protocol Analytics {
    typealias Attributes = [String: Any]
    func log(
        event eventName: String,
        with attributes: Attributes?
    )
}

public extension Analytics {
    func log(_ event: AnalyticsEvent) {
        var parameters: [String: Any] = [:]
        for (key, value) in event.parameters {
            switch value {
            case let bool as Bool:
                parameters[key.rawValue] = bool.description
            default:
                parameters[key.rawValue] = value
            }
        }
        log(event: event.name, with: parameters)
    }
}

public enum AnalyticsEvent {
  case seach(query: String)
  case userLoggedIn
}

public extension AnalyticsEvent {
    enum Key: String, CaseIterable {
        case query
    }
}

public extension AnalyticsEvent {
  var name: String {
    switch self {
    case .seach:
      return "search"
    case .userLoggedIn:
      return "user_logged_in"
    }
  }
  
var parameters: [Key: Any] {
  var result: [Key: Any] = [:]
  switch self {
  case .search(let query):
    result[.query] = query
  case .userLoggedIn:
    break
  }
  return result
}