namespace DanieleMarotta.RiversongCodeShowcase
{
    [GameSystemGroup(typeof(DayOnlyAgentSpawnSystemsGroup))]
    public class HunterSpawnSystem : GameSystem, IUpdatable
    {
        [InjectService]
        private GameConfig _config;

        [InjectService]
        private IEntityCache _entityCache;

        [InjectService]
        private ITileSpace _tileSpace;

        [InjectService]
        private IAgentFactory _agentFactory;

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

        public void Update()
        {
            var agentDefinition = (AgentDefinition)_config.Agents.HunterAgent.Asset;

            foreach (var hunterBuilding in _entityCache.GetHunterBuildings()) SpawnHunterAgent(hunterBuilding, agentDefinition);
        }

        private void SpawnHunterAgent(Building hunterBuilding, AgentDefinition agentDefinition)
        {
            if (!_agentFactory.CanSpawnAgent(hunterBuilding, 1, AgentJob.Hunter)) return;

            var position = _tileSpace.TileToWorld(hunterBuilding.Rect.Center);
            var critterId = hunterBuilding.Definition.TargetCritter.RuntimeId;

            var agent = _agentFactory.CreateVillager(agentDefinition, hunterBuilding, position, AgentJob.Hunter);

            ref var jobState = ref agent.GetJobStateRW();
            jobState.StateMachineStep = AgentStateMachineStep.Hunter_SeekingPrey;

            IntentQueue.SeekPrey(ref agent.GetIntentQueueRW(), critterId, hunterBuilding.Definition.Range);
        }
    }
}