using System.Collections.Generic;
using GameFramework.Event;
using GeometryTD.DataTable;
using GeometryTD.Entity;
using GeometryTD.Entity.EntityData;
using UnityEngine;
using UnityGameFramework.Runtime;

namespace GeometryTD.CustomComponent
{
    public class EnemyManager
    {
        private readonly List<int> _trackedEnemyIdBuffer = new();
        private readonly EnemySpawnDirector _enemySpawnDirector = new();
        private readonly EnemyConfigProvider _enemyConfigProvider = new();
        private readonly EnemySpawnPathResolver _enemySpawnPathResolver = new();
        private readonly EnemyLifecycleTracker _enemyLifecycleTracker = new();

        private CombatScheduler _combatScheduler;
        private EntityComponent _entity;
        
        private int _defeatedEnemyCount;
        private bool _initialized;

        public int AliveEnemyCount => _enemyLifecycleTracker.AliveEnemyCount;
        public int DefeatedEnemyCount => _defeatedEnemyCount;
        public bool HasAliveBoss => _enemyLifecycleTracker.HasAliveBoss;
        public bool IsPhaseSpawnCompleted => _enemySpawnDirector.IsPhaseSpawnCompleted;
        public bool IsPhaseRunning => _enemySpawnDirector.IsPhaseRunning;

        public void OnInit(CombatScheduler combatScheduler)
        {
            _combatScheduler = combatScheduler;
            if (_initialized)
            {
                return;
            }

            _entity = GameEntry.Entity;
            _defeatedEnemyCount = 0;
            _enemySpawnDirector.Reset();
            _enemyConfigProvider.Reset();
            _enemySpawnPathResolver.Reset();
            _trackedEnemyIdBuffer.Clear();
            _enemyLifecycleTracker.Reset();

            GameEntry.Event.Subscribe(ShowEntitySuccessEventArgs.EventId, OnShowEntitySuccess);
            GameEntry.Event.Subscribe(ShowEntityFailureEventArgs.EventId, OnShowEntityFailure);
            GameEntry.Event.Subscribe(HideEntityCompleteEventArgs.EventId, OnHideEntityComplete);
            _initialized = true;
        }

        public void BeginPhase(DRLevelPhase phase, IReadOnlyList<DRLevelSpawnEntry> spawnEntries)
        {
            if (!_initialized || _combatScheduler == null)
            {
                return;
            }

            _ = phase;
            EndPhase();
            _enemySpawnPathResolver.RefreshCache(_combatScheduler, true);
            _enemySpawnDirector.BeginPhase(spawnEntries);
        }

        public void OnUpdate(float elapseSeconds, float realElapseSeconds)
        {
            if (!_initialized || _combatScheduler == null || !_enemySpawnDirector.IsPhaseRunning)
            {
                return;
            }

            _enemySpawnPathResolver.RefreshCache(_combatScheduler, false);
            _enemySpawnDirector.OnUpdate(elapseSeconds, SpawnEnemies);
        }

        public void EndPhase()
        {
            _enemySpawnDirector.EndPhase();
        }

        public void OnDestroy()
        {
            if (!_initialized)
            {
                _combatScheduler = null;
                return;
            }

            CleanupTrackedEnemies();
            EndPhase();
            GameEntry.Event.Unsubscribe(ShowEntitySuccessEventArgs.EventId, OnShowEntitySuccess);
            GameEntry.Event.Unsubscribe(ShowEntityFailureEventArgs.EventId, OnShowEntityFailure);
            GameEntry.Event.Unsubscribe(HideEntityCompleteEventArgs.EventId, OnHideEntityComplete);

            _enemySpawnPathResolver.Reset();
            _trackedEnemyIdBuffer.Clear();
            _enemyLifecycleTracker.Reset();
            _defeatedEnemyCount = 0;
            _enemyConfigProvider.Reset();
            _combatScheduler = null;
            _initialized = false;
        }

        public void ResetCombatStats()
        {
            _defeatedEnemyCount = 0;
        }

        public void CleanupTrackedEnemies()
        {
            _enemyLifecycleTracker.CopyTrackedEntityIdsTo(_trackedEnemyIdBuffer);
            if (_trackedEnemyIdBuffer.Count <= 0)
            {
                return;
            }

            _enemyLifecycleTracker.Reset();

            if (_entity == null)
            {
                return;
            }

            for (int i = 0; i < _trackedEnemyIdBuffer.Count; i++)
            {
                int trackedEnemyEntityId = _trackedEnemyIdBuffer[i];
                if (_entity.HasEntity(trackedEnemyEntityId) || _entity.IsLoadingEntity(trackedEnemyEntityId))
                {
                    _entity.HideEntity(trackedEnemyEntityId);
                }
            }
        }

        private void SpawnEnemies(DRLevelSpawnEntry entry, int spawnCount)
        {
            if (spawnCount <= 0)
            {
                return;
            }

            if (!_enemySpawnPathResolver.TryResolveSpawnPath(_combatScheduler, entry.SpawnPointId, out IReadOnlyList<Vector3> pathPoints))
            {
                return;
            }

            DREnemy enemyConfig = _enemyConfigProvider.GetEnemyConfig(entry.EnemyId);
            if (enemyConfig == null)
            {
                return;
            }

            int scaledBaseHp = _enemyConfigProvider.ResolveScaledEnemyBaseHp(enemyConfig.BaseHp, _combatScheduler);
            bool isBoss = entry.EntryType == Definition.EntryType.Boss;

            for (int i = 0; i < spawnCount; i++)
            {
                int enemyEntityId = _entity.GenerateSerialId();
                _enemyLifecycleTracker.TrackEnemy(enemyEntityId, enemyConfig, isBoss);
                EnemyData enemyData = new EnemyData(
                    enemyEntityId,
                    enemyConfig.EntityId,
                    pathPoints[0],
                    scaledBaseHp,
                    enemyConfig.Speed,
                    pathPoints);
                _entity.ShowEnemy(enemyData);
            }
        }

        private void OnShowEntitySuccess(object sender, GameEventArgs e)
        {
            if (!(e is ShowEntitySuccessEventArgs ne)) return;
            
            if (ne.EntityLogicType == typeof(EnemyEntity) &&
                _enemyLifecycleTracker.Contains(ne.Entity.Id))
            {
                _enemyLifecycleTracker.HandleShowSuccess(ne.Entity.Id);
            }
        }

        private void OnShowEntityFailure(object sender, GameEventArgs e)
        {
            if (!(e is ShowEntityFailureEventArgs ne))
            {
                return;
            }

            if (ne.EntityLogicType != typeof(EnemyEntity))
            {
                return;
            }

            _enemyLifecycleTracker.HandleShowFailure(ne.EntityId);
        }

        private void OnHideEntityComplete(object sender, GameEventArgs e)
        {
            if (!(e is HideEntityCompleteEventArgs ne))
            {
                return;
            }

            if (!_enemyLifecycleTracker.TryHandleHideComplete(ne.EntityId, out DREnemy enemyConfig))
            {
                return;
            }
            
            bool wasKilled = EnemyEntity.TryConsumeKilledFlag(ne.EntityId);
            bool isCombatRunning = _combatScheduler != null && _combatScheduler.IsRunning;

            if (isCombatRunning && wasKilled && enemyConfig != null)
            {
                _defeatedEnemyCount++;
                _combatScheduler.OnEnemyDefeated(enemyConfig);
            }
            else if (isCombatRunning && !wasKilled && enemyConfig != null)
            {
                _combatScheduler.OnEnemyReachedBase(enemyConfig);
            }
        }
    }
}