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

namespace CoreGame.Render
{
    public class AttractorStartWaitCatchSystem : 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 AttractorStartWaitCatchSystem(Contexts contexts)
        {
            var matcher = CombatMatcher.AllOf(CombatMatcher.Attractor).NoneOf(CombatMatcher.WaitPickUpDropItem);
            m_AttractorGroup = contexts.combat.GetGroup(matcher);
            m_BeAttractGroup = contexts.combat.GetGroup(MatcherExt.s_CanWaitToBeAttractedMatcher);
        }

        public void Execute(float deltaTime)
        {
            m_BeAttractGroup.GetEntities(m_DropItemEntities);
            if (m_DropItemEntities.Count == 0)
                return;
            m_AttractorGroup.GetEntities(m_AttractorEntities);
            if (m_AttractorEntities.Count == 0)
                return;
            for (int i = 0; i < m_AttractorEntities.Count; i++)
            {
                var attractorEnt = m_AttractorEntities[i];
                if (attractorEnt.isDead)
                    continue;
                var range = attractorEnt.property.PickupRange;

                for (int j = 0; j < m_DropItemEntities.Count; j++)
                {
                    var dropItemEntity = m_DropItemEntities[j];
                    var waitToBeAttracted = dropItemEntity.waitToBeAttracted;
                    var et = dropItemEntity.transformProxy;
                    if (waitToBeAttracted.pickUpRange > 0.001f)
                    {
                        range = waitToBeAttracted.pickUpRange;
                    }
                    var attractorPos = attractorEnt.transformProxy.position;
                    var inAreaRange = (attractorPos - et.position).SqrMagnitude() < range * range;
                    if (!inAreaRange) continue;
                    attractorEnt.AddWaitPickUpDropItem(dropItemEntity.creationIndex, 0f);
                    break;
                }
            }
        }
    }
}