using System;
using Framework;
using Gameplay.Common;
using Gameplay.Unit;
using Gameplay.Level;

namespace Gameplay.Area
{
    public class AreaEventHandler : IEventHandler
    {
        private readonly AreaManager _areaManager;

        public AreaEventHandler(AreaManager areaManager)
        {
            _areaManager = areaManager;
        }

        public void RegisterEvents()
        {
            EventManager.Instance.Register(EventManager.EventName.INFIGHT_UNIT_READY, (Action<GameUnit>)OnUnitReady);
            EventManager.Instance.Register(EventManager.EventName.INFIGHT_UNIT_REMOVE, (Action<GameUnit>)OnUnitRemove);
            EventManager.Instance.Register(EventManager.EventName.INFIGHT_UNIT_CELLINDEX_CHANGE, (Action<GameUnit>)OnUnitCellChange);

            EventManager.Instance.Register(EventManager.EventName.LevelUnitSelect, (Action<GameUnit>)OnSelectCharacter);
            EventManager.Instance.Register(EventManager.EventName.LevelUnitUnSelect, (Action<GameUnit>)OnUnSelectCharacter);

            EventManager.Instance.Register(EventManager.EventName.INFIGHT_ENTER_UNITCONTAINER, (Action<GameUnit>)_OnEnterUnitContainer);
            EventManager.Instance.Register(EventManager.EventName.INFIGHT_EXIT_UNITCONTAINER, (Action<EDExitUnitContainer>)_OnExitUnitContainer);
            
            EventManager.Instance.Register(EventManager.EventName.INFIGHT_SKILL_END_PAUSE, OnSkillPauseEnd);
        }

        public void UnregisterEvents()
        {
            EventManager.Instance.Unregister(EventManager.EventName.INFIGHT_UNIT_READY, (Action<GameUnit>)OnUnitReady);
            EventManager.Instance.Unregister(EventManager.EventName.INFIGHT_UNIT_REMOVE, (Action<GameUnit>)OnUnitRemove);
            EventManager.Instance.Unregister(EventManager.EventName.INFIGHT_UNIT_CELLINDEX_CHANGE, (Action<GameUnit>)OnUnitCellChange);

            EventManager.Instance.Unregister(EventManager.EventName.LevelUnitSelect, (Action<GameUnit>)OnSelectCharacter);
            EventManager.Instance.Unregister(EventManager.EventName.LevelUnitUnSelect, (Action<GameUnit>)OnUnSelectCharacter);

            EventManager.Instance.Unregister(EventManager.EventName.INFIGHT_ENTER_UNITCONTAINER, (Action<GameUnit>)_OnEnterUnitContainer);
            EventManager.Instance.Unregister(EventManager.EventName.INFIGHT_EXIT_UNITCONTAINER, (Action<EDExitUnitContainer>)_OnExitUnitContainer);
            
            EventManager.Instance.Unregister(EventManager.EventName.INFIGHT_SKILL_END_PAUSE, OnSkillPauseEnd);
        }

        public void Dispose()
        {
            UnregisterEvents();
        }

        private void OnUnitReady(GameUnit unit)
        {
            var bornCellIndex = unit.transData.cellIndex;
            if (AreaManager.ENABLE_LOG)
                Log($"Unit: {unit.GetID()} Ready at: {bornCellIndex}");
            
            var getUnits = _areaManager.GetUnitsByCellIndex(bornCellIndex);
            if (getUnits.Contains(unit))
            {
                return;
            }
            
            _areaManager._AddUnitToCellIndex(bornCellIndex, unit);
        }

        private void OnUnitRemove(GameUnit unit)
        {
            var cellIndex = unit.transData.cellIndex;
            if (AreaManager.ENABLE_LOG)
                Log($"Unit: {unit.GetID()} Remove at: {cellIndex}");
            
            _areaManager._OnUnitRemove(unit);
        }

        private void OnUnitCellChange(GameUnit unit)
        {
            var lastCellIndex = unit.transData.lastCellIndex;
            var newCellIndex = unit.transData.cellIndex;

            if (lastCellIndex != -1)
            {
                if (_areaManager._cellIndex2Units.TryGetValue(lastCellIndex, out var unitList))
                {
                    unitList.Remove(unit);
                }
            }
            
            _areaManager._AddUnitToCellIndex(newCellIndex, unit);
            if (AreaManager.ENABLE_LOG)
                Log($"Unit CellIndexChange:{unit.GetID()} from:{lastCellIndex} to {newCellIndex}");
        }

        private void OnSelectCharacter(GameUnit c)
        {
            if (!LevelManager.Instance.CurrentLevel.IsInBattle())
            {
                return;
            }
            
            _areaManager.attackArea.SetOwner(c);
            _areaManager.moveAreaView.Show(c);
        }

        private void OnUnSelectCharacter(GameUnit c)
        {
            if (!LevelManager.Instance.CurrentLevel.IsInBattle())
            {
                return;
            }
            
            _areaManager.attackArea.HideArea();
            _areaManager.moveAreaView.Hide();
        }

        private void _OnEnterUnitContainer(GameUnit unit)
        {
            var cellIndex = unit.transData.cellIndex;
            var unitList = _areaManager._cellIndex2Units[cellIndex];
            unitList.Remove(unit);
            if (AreaManager.ENABLE_LOG)
                Log($"Unit: {unit.GetID()} Enter UnitContainer at:{cellIndex}");
        }

        private void _OnExitUnitContainer(EDExitUnitContainer ed)
        {
            var unit = ed.unit;
            var bornCellIndex = unit.transData.cellIndex;
            if (AreaManager.ENABLE_LOG)
                Log($"Unit: {unit.GetID()} Exit UnitContainer at:{bornCellIndex}");
            
            var getUnits = _areaManager.GetUnitsByCellIndex(bornCellIndex);
            if (getUnits.Contains(unit))
            {
                return;
            }
            
            _areaManager._AddUnitToCellIndex(bornCellIndex, unit);
        }

        private void OnSkillPauseEnd()
        {
            if (_areaManager.attackArea == null)
            {
                DebugUtil.LogError("AttackArea为空");
                return;
            }
            _areaManager.attackArea.CancelForce();
        }

        private void Log(string str)
        {
            if (!AreaManager.ENABLE_LOG) return;
            DebugUtil.Log($"[AreaManager] {str}");
        }
    }
}