#if HAVE_NODECANVAS

using System;

using UnityEngine;

using ParadoxNotion.Design;
using NodeCanvas.Framework;

using Framework.State;

namespace Framework.Actors {

  /// <summary>Lets the player assume control over an actor</summary>
  [Category("Actors")]
  [Description("Lets the player assume control over an actor")]
  public class TakeControlTask : ActionTask {

    /// <summary>Actor over which the player will get control</summary>
    [RequiredField]
    public BBParameter<ActorController> Actor;

    /// <summary>Index of the player that will assume control of the actor</summary>
    public int PlayerIndex = 0;

    /// <summary>Injects the instance's dependencies</summary>
    /// <param name="controlManager">Manages the active game object</param>
    /// <remarks>
    ///   This method is called automatically by the services framework. Any parameters
    ///   it requires will be filled out by looking up the respective services and creating
    ///   them as needed.
    /// </remarks>
    protected void Inject(IControlManager controlManager) {
      this.controlManager = controlManager;
    }

    /// <summary>Summary of what this action does</summary>
    protected override string info {
      get { return "Give player control over " + this.Actor.name; }
    }

    /// <summary>Called once when the action is executed</summary>
    protected override void OnExecute() {
      IControllable controllableActor = this.Actor.value.GetComponent<IControllable>();
      if(controllableActor == null) {
        Debug.LogError(
          "Actor '" + this.Actor.name + "' is not a controllable actor that implements " +
          "the IControllable interface. Player will NOT get control of the actor."
        );
        return;
      }

      // If we don't have the control manager, ask the dependency injector
      if(this.controlManager == null) {
        Services.ServiceInjector.InjectDependencies(this);
      }

      // If we still don't have it, something is very wrong and we blow up.
      if(this.controlManager == null) {
        throw new InvalidOperationException(
          "Could not obtain IControlManager service. The dependeny injector is broken."
        );
      }
      
      this.controlManager.AssumeControl(this.PlayerIndex, controllableActor);

      EndAction();
    }

    /// <summary>Service managing which actor the player is controlling</summary>
    [NonSerialized]
    private IControlManager controlManager;

  }

} // namespace Framework.Actors

#endif // HAVE_NODECANVAS