TargetingStateSwitcher

using AnimalSimulator.Gameplay;
using AnimalSimulator.Gameplay.Input;
using AnimalSimulator.Installers;

using UniRx;

using Zenject;

using IState = AnimalSimulator.AI.States.IState;

namespace AnimalSimulator.Targeting
{
    public class TargetingStateSwitcher : ITickable, IInitializable

    {
        private readonly GameControl _control;
        private readonly TargetAnimalFinder _targetAnimalFinder;

        public readonly Subject<Unit> OnFreeTarget = new Subject<Unit>();
        public readonly Subject<Animal> OnLockTarget = new Subject<Animal>();

        public bool Targeting { get; private set; }

        public TargetingStateSwitcher(GameControl control, TargetAnimalFinder targetAnimalFinder)
        {
            _control = control;
            _targetAnimalFinder = targetAnimalFinder;
        }

        public void Initialize() =>
            FreeState();

        public void Tick()
        {
            if (_control.Camera.LockTarget.triggered)
                ToggleTargetingState();
        }

        private void ToggleTargetingState()
        {
            Targeting = !Targeting;

            if (Targeting)
            {
                Animal potentialTarget = _targetAnimalFinder.PotentialTarget.Value;

                if (potentialTarget == null)
                {
                    Targeting = false;
                    return;
                }

                OnLockTarget.OnNext(potentialTarget);
            }
            else
            {
                FreeState();
            }
        }

        private void FreeState() =>
            OnFreeTarget.OnNext(Unit.Default);

        public void DisableLock()
        {
            Targeting = false;
            FreeState();
        }
    }
}