riversong-code-showcase/Source/Riversong/Game/WorldGen/Operations/CritterHerdsGeneratorOperation.cs

using Cysharp.Threading.Tasks;
using UnityEngine;

namespace DanieleMarotta.RiversongCodeShowcase
{
    public class CritterHerdsGeneratorOperation : IWorldGeneratorOperation
    {
        [InjectService]
        private IEntityCollection _entityCollection;

        [InjectService]
        private IGameDatabase _gameDatabase;

        [InjectService]
        private IAgentFactory _agentFactory;

        public UniTask Execute(World world)
        {
            var critters = _gameDatabase.OfType<CritterDefinition>();

            foreach (var eligibleCenter in world.CritterHerdsState.EligibleCenters)
            {
                var critter = critters[Random.Range(0, critters.Count)];

                var herd = _entityCollection.CreateAndAdd<CritterHerd>();
                herd.CritterDefinition = critter;
                herd.Center = eligibleCenter;
                herd.MaxCritterCount = Random.Range(critter.MinCritterCount, critter.MaxCritterCount + 1);

                _agentFactory.InitializeAgentSource(herd);
            }

            return UniTask.CompletedTask;
        }
    }
}