using Random = UnityEngine.Random;

namespace DanieleMarotta.RiversongCodeShowcase
{
    [GameSystemGroup(typeof(DefaultAgentsSystemGroup))]
    public class CritterHerdMoveCenterSystem : GameSystem, IUpdatable
    {
        [InjectService]
        private IEntityCollection _entityCollection;

        [InjectService]
        private World _world;

        [InjectService]
        private ISignalBus _signalBus;

        public CritterHerdMoveCenterSystem(IServiceLocator serviceLocator) : base(serviceLocator)
        {
        }

        public void Update()
        {
            foreach (CritterHerd herd in _entityCollection.GetInternalEntityList(typeof(CritterHerd)))
            {
                if (!_world.BlockMap.IsBlocked(herd.Center, BlockReason.BlocksAgents)) continue;

                var oldCenter = herd.Center;
                var moveDirection = ((Directions)Random.Range(0, 8)).ToVector();
                var center = oldCenter + 4 * moveDirection;

                if (!_world.Contains(center) || _world.BlockMap.IsBlocked(center, BlockReason.BlocksAgents)) continue;

                herd.Center = center;
            }
        }
    }
}