using System.Collections.Generic;
using CoreGame;
using Entitas;

namespace CoreGame.Render
{
    public class AttractorInstantCatchSystem : IExecuteSystem
    {
        private readonly IGroup<CombatEntity> m_AttractorGroup;
        private readonly IGroup<CombatEntity> m_BeAttractGroup;
        private readonly List<CombatEntity> m_AttractorEntities = new();
        private readonly List<CombatEntity> m_DropItemEntities = new();

        public AttractorInstantCatchSystem(Contexts contexts)
        {
            m_AttractorGroup =
                contexts.combat.GetGroup(CombatMatcher.AllOf(CombatMatcher.Attractor).NoneOf(CombatMatcher.Dead));
            m_BeAttractGroup = contexts.combat.GetGroup(MatcherExt.s_CanInstantToBeAttractedMatcher);
        }

        public void Execute(float deltaTime)
        {
            m_BeAttractGroup.GetEntities(m_DropItemEntities);
            if (m_DropItemEntities.Count == 0)
                return;
            m_AttractorGroup.GetEntities(m_AttractorEntities);

            for (int i = 0; i < m_DropItemEntities.Count; i++)
            {
                var dropItemEntity = m_DropItemEntities[i];
                var instantToBeAttracted = dropItemEntity.instantToBeAttracted;
                var et = dropItemEntity.transformProxy;
                if (instantToBeAttracted.specifiedAttractorEid != 0)
                {
                    var specifiedAttractor = Contexts.Combat.GetEntity(instantToBeAttracted.specifiedAttractorEid);
                    if (specifiedAttractor.IsValid())
                    {
                        // dropItemEntity.AddBeAttracted(instantToBeAttracted.specifiedAttractorEid, et.position,
                        //     et.GetLocalScale().x, BattleConst.DropItemScale, BattleConst.DropItemFlyDuration);
                        continue;
                    }
                }

                for (int j = 0; j < m_AttractorEntities.Count; j++)
                {
                    var attractorEnt = m_AttractorEntities[j];
                    var range = attractorEnt.property.PickupRange;
                    if (instantToBeAttracted.pickUpRange > 0.001f)
                    {
                        range = instantToBeAttracted.pickUpRange;
                    }

                    var attractorPos = attractorEnt.transformProxy.position;
                    var inAreaRange = (attractorPos - et.position).SqrMagnitude() < range * range;
                    if (!inAreaRange) continue;
                    // dropItemEntity.AddBeAttracted(attractorEnt.creationIndex, et.position,
                    //     et.GetLocalScale().x, BattleConst.DropItemScale, BattleConst.DropItemFlyDuration);
                }
            }
        }
    }
}