using System.Collections.Generic;
using Entitas;

namespace CoreGame.Render
{
    /// <summary>
    /// 暴风雪等区域实体， 定时释放技能
    /// </summary>
    public class ZoneSys : IExecuteSystem
    {
        private readonly IGroup<CombatEntity> m_ZoneGroup;
        private readonly List<CombatEntity> m_CacheEntities = new List<CombatEntity>();

        public ZoneSys(CombatContext contexts)
        {
            m_ZoneGroup = contexts.GetGroup(CombatMatcher.Zone);
        }

        public void Execute(float deltaTime)
        {
            m_ZoneGroup.GetEntities(m_CacheEntities);
            for (int i = 0; i < m_CacheEntities.Count; i++)
            {
                ProcessZone(m_CacheEntities[i], deltaTime);
            }
        }

        private void ProcessZone(CombatEntity entity, float deltaTime)
        {
            var zone = entity.zone;
            if (zone.hasInvalidated)
                return;

            if (zone.duration < 0 || (zone.loopType == ZoneLoopType.Count && zone.loopCnt <= 0))
            {
                var attachAbilityProcess = false;
                var endAbilityProcess = false;
                if (zone.attachAbilityCtxSeq > 0)
                {
                    if (entity.abilitySystem.HasAbilityProcess(zone.attachAbilityCtxSeq))
                    {
                        attachAbilityProcess = true;
                    }
                    else
                    {
                        entity.abilitySystem.UnGrantAbility(zone.attachAbilityCtxSeq);
                    }
                }

                if (zone.endAbilityCtxSeq > 0)
                {
                    if (entity.abilitySystem.HasAbilityProcess(zone.endAbilityCtxSeq))
                    {
                        endAbilityProcess = true;
                    }
                    else if (ZoneSrv.ZoneActiveAbility(entity, zone.endAbilityCtxSeq, true))
                    {
                        ZoneSrv.InvalidateZone(entity);
                        endAbilityProcess = true;
                    }
                }

                if (attachAbilityProcess == false && endAbilityProcess == false)
                {
                    ZoneSrv.DestroyZone(entity);
                }
                return;
            }


            zone.duration -= deltaTime;

            if (zone.isFollow)
            {
                var targetEnt = Contexts.Combat.GetEntity(zone.targetEid);
                var entityTransformProxy = entity.logicTransform;
                if (targetEnt.IsValid())
                {
                    var targetEntTransformProxy = targetEnt.logicTransform;
                    zone.lastPos = targetEntTransformProxy.position;
                    zone.lastDir = targetEntTransformProxy.forward;
                }
                else
                {
                    if (zone.entInvalidDestroy)
                    {
                        ZoneSrv.DestroyZone(entity);
                        return;
                    }
                }
                entityTransformProxy.SetPosition(zone.lastPos + zone.offsetPos);
                entityTransformProxy.SetDirection(zone.lastDir);
            }

            if (zone.loopType == ZoneLoopType.Time)
            {
                zone.accumulatedTime += deltaTime;
                if (zone.accumulatedTime >= zone.interval)
                {
                    zone.accumulatedTime -= zone.interval;
                    ZoneSrv.ZoneActiveAbility(entity, zone.attachAbilityCtxSeq, false);
                }
            }
            else if (zone.loopType == ZoneLoopType.Count)
            {
                if (zone.loopCnt > 0)
                {
                    if (ZoneSrv.ZoneActiveAbility(entity, zone.attachAbilityCtxSeq, false))
                    {
                        zone.loopCnt--;
                    }
                }
            }
        }
    }
}