.swift

import Foundation
import shared

final class Koin {

  private var core: Koin_coreKoin?


  static let instance = Koin()

  static func start() {
    if instance.core == nil {
      let app = KoinIOS.shared.initialize()
      instance.core = app.koin
    }
    if instance.core == nil {
      fatalError("Can't initialize Koin.")
    }
  }


  private init() {
  }
  
  func get<T: AnyObject>() -> T {
    guard let core = core else {
      fatalError("You should call `start()` before using \(#function)")
    }

    guard let result = core.get(objCClass: T.self) as? T else {
      fatalError("Koin can't provide an instance of type: \(T.self)")
    }

    return result
  }
}