World.swift

// Created by Josh Adams, who holds the copyright and reserves all rights, on 1/6/23.
// https://www.pointfree.co/blog/posts/21-how-to-control-the-world

import Foundation

var Current = World.chooseWorld()

class World: ObservableObject {
  @Published var settings: Settings
  @Published var soundPlayer: SoundPlayer
  @Published var imageLoader: ImageLoader

  init(settings: Settings, soundPlayer: SoundPlayer, imageLoader: ImageLoader) {
    self.settings = settings
    self.soundPlayer = soundPlayer
    self.imageLoader = imageLoader
  }

  static func chooseWorld() -> World {
    if NSClassFromString("XCTest") != nil {
      return World.unitTest
    } else {
      return World.production
    }
  }

  static let production: World = {
    World(
      settings: Settings(getterSetter: GetterSetterReal()),
      soundPlayer: SoundPlayerReal(),
      imageLoader: ImageLoader()
    )
  }()

  static let unitTest: World = {
    World(
      settings: Settings(getterSetter: GetterSetterFake()),
      soundPlayer: SoundPlayerDummy(),
      imageLoader: ImageLoader()
    )
  }()
}