using System.Collections;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;
using UnityEngine.SceneManagement;
using System;
#if UNITY_EDITOR
using UnityEditor;
#endif
using InfallibleCode;

[System.Serializable]
public class SceneAssetReference
{
#if UNITY_EDITOR
    public SceneAsset sceneAsset;
#endif

    [HideInInspector]
    public string sceneName;

    public string SceneName
    {
        get
        {
#if UNITY_EDITOR
            if (sceneAsset != null)
            {
                sceneName = sceneAsset.name;
            }
#endif
            return sceneName;
        }
    }
}

[System.Serializable]
public class NearbyRoomCategory
{
    public string categoryName;
    public List<SceneAssetReference> nearbyRoomScenes = new List<SceneAssetReference>();
}

public class RoomTrigger : MonoBehaviour
{
    public int playersCurrentRoomID;
    public int playersPreviousRoomID;
    public int roomID;

    [Header("Hiding Spots")]
    [SerializeField] private List<ClosetHideBehaviour> closetHideBehaviour = new List<ClosetHideBehaviour>();
    [SerializeField] private List<BedHideBehaviourBase> bedHideBehaviour = new List<BedHideBehaviourBase>();
    [SerializeField] private List<Transform> roomPatrolPoints = new List<Transform>();

    [Header("Nearby Room Categories")]
    [SerializeField] public List<NearbyRoomCategory> nearbyRoomCategories = new List<NearbyRoomCategory>();
    [SerializeField] public int activeCategoryIndex = 0;

    [Header("Room Scene Info")]
    [SerializeField] private List<GameObject> roomChunks = new List<GameObject>();
#if UNITY_EDITOR
    [SerializeField] private SceneAsset roomSceneAsset;
#endif
    [SerializeField] private string roomSceneName;

    public string RoomSceneName
    {
        get
        {
#if UNITY_EDITOR
            if (roomSceneAsset != null)
            {
                roomSceneName = roomSceneAsset.name;
            }
#endif
            return roomSceneName;
        }
    }

    private bool playerIsInTrigger;
    public bool enemyAIIsInTrigger;
    private bool startExecuted = false;

    private void Start()
    {
        StartCoroutine(AfterGameLoaded());
    }

    IEnumerator AfterGameLoaded()
    {
        yield return new WaitUntil(() => LoadManager.GetInstance() != null && !LoadManager.GetInstance().LoadingGame);
        yield return new WaitUntil(() => RoomManager.GetInstance() != null);
        AfterLoadUpdate();
    }

    private void AfterLoadUpdate()
    {
        if (RoomManager.GetInstance() != null)
        {
            RoomManager.GetInstance().RegisterRoomTrigger(this);
        }

        GameSaveData loadedData = SaveSlotManager.LoadPlayerData(SaveSlotManager.GetInstance().selectedSaveSlotID);


        bool categorySet = false;

        if (loadedData != null && loadedData.sceneSaveData.RoomTriggerData != null)
        {
            foreach (var roomTriggerData in loadedData.sceneSaveData.RoomTriggerData)
            {
                if (roomTriggerData.roomSceneName == RoomSceneName)
                {
                    SetActiveCategory(roomTriggerData.activeCategoryIndex);
                    categorySet = true;
                    break;
                }
            }
        }

        // 🛑 Fallback: Δες αν υπάρχει snapshot από το RoomManager
        if (!categorySet && RoomManager.GetInstance() != null && RoomManager.GetInstance().roomTriggersSnapshotData != null)
        {
            foreach (var snapshot in RoomManager.GetInstance().roomTriggersSnapshotData)
            {
                if (snapshot.roomSceneName == RoomSceneName)
                {
                    SetActiveCategory(snapshot.activeCategoryIndex);
                    Debug.Log($"[RoomTrigger] Fallback: Restored activeCategoryIndex from RoomManager snapshot: {snapshot.activeCategoryIndex}");
                    break;
                }
            }
        }

        var pending = RoomManager.GetInstance()?.pendingCategoryChanges?
    .FirstOrDefault(p => p.roomSceneName == RoomSceneName);

        if (pending != null)
        {
            SetActiveCategory(pending.categoryIndex);
            UpdateRoomTriggerSnapshot();
            RoomManager.GetInstance().pendingCategoryChanges.Remove(pending);
            Debug.Log($"[RoomTrigger] Applied pending category change ({pending.categoryIndex}) for scene {RoomSceneName}");
        }


        RoomManager.GetInstance().OnRoomsChanged += NearbyRoomsUpdate;
        startExecuted = true;
    }

    private void OnDestroy()
    {
        if (RoomManager.GetInstance() != null)
            RoomManager.GetInstance().OnRoomsChanged -= NearbyRoomsUpdate;

        if (RoomManager.GetInstance() != null)
        {
            RoomManager.GetInstance().UnregisterRoomTrigger(this);
        }
    }

    public void UpdateRoomTriggerSnapshot()
    {
        if (RoomManager.GetInstance() == null)
            return;

        var existing = RoomManager.GetInstance().roomTriggersSnapshotData.Find(
            x => x.roomSceneName == RoomSceneName
        );

        if (existing != null)
        {
            existing.activeCategoryIndex = activeCategoryIndex;
        }
        else
        {
            RoomTriggerData newData = new RoomTriggerData
            {
                roomSceneName = RoomSceneName,
                activeCategoryIndex = activeCategoryIndex
            };
            RoomManager.GetInstance().roomTriggersSnapshotData.Add(newData);
        }
    }

    private void NearbyRoomsUpdate()
    {
        if (playerIsInTrigger)
        {
            SceneLoadWithChunks();
        }
    }

    public List<string> GetActiveNearbyRooms()
    {
        if (nearbyRoomCategories.Count == 0 || activeCategoryIndex < 0 || activeCategoryIndex >= nearbyRoomCategories.Count)
            return new List<string>();

        return nearbyRoomCategories[activeCategoryIndex].nearbyRoomScenes
            .Where(s => !string.IsNullOrEmpty(s.SceneName))
            .Select(s => s.SceneName)
            .ToList();
    }

    public void SetActiveCategory(int index)
    {
        if (index >= 0 && index < nearbyRoomCategories.Count)
        {
            activeCategoryIndex = index;
            RoomManager.GetInstance()?.RoomsChanged();
            //UpdateRoomTriggerSnapshot();

            if (playerIsInTrigger)
            {
                Debug.Log($"[RoomTrigger] Active category changed to: {nearbyRoomCategories[index].categoryName}. Reloading scenes...");
                SceneLoadWithChunks();
            }
        }
    }

    //public void NextCategory()
    //{
    //    if (nearbyRoomCategories.Count == 0) return;
    //    activeCategoryIndex = (activeCategoryIndex + 1) % nearbyRoomCategories.Count;
    //    RoomManager.GetInstance()?.RoomsChanged();
    //    UpdateRoomTriggerSnapshot();
    //}

    //public void PreviousCategory()
    //{
    //    if (nearbyRoomCategories.Count == 0) return;
    //    activeCategoryIndex = (activeCategoryIndex - 1 + nearbyRoomCategories.Count) % nearbyRoomCategories.Count;
    //    RoomManager.GetInstance()?.RoomsChanged();
    //    UpdateRoomTriggerSnapshot();
    //}

    private IEnumerator DelayedTrigger(Collider other)
    {
        yield return new WaitUntil(() => startExecuted);
        OnTriggerEnter(other);
    }

    private void OnTriggerEnter(Collider other)
    {
        if (!startExecuted)
        {
            StartCoroutine(DelayedTrigger(other));
            return;
        }

        if (other.CompareTag("Player") && !playerIsInTrigger)
        {
            playersCurrentRoomID = roomID;
            RoomManager.GetInstance()._roomID = roomID;
            RoomManager.GetInstance()._roomPatrolPoints = roomPatrolPoints;
            GetCurrentRoomsHideBehaviours();

            RoomManager.GetInstance()._nearbyRoomSceneNames = GetActiveNearbyRooms();
            SetLastRoomTriggerPlayerEntered();
            SceneLoadWithChunks();

            playerIsInTrigger = true;
        }

        if (other.CompareTag("EnemyAI") && !enemyAIIsInTrigger)
        {
            enemyAIIsInTrigger = true;
        }
    }

    private void SceneLoadWithChunks()
    {
        if (string.IsNullOrEmpty(RoomSceneName))
            return;

        List<string> activeNearbyScenes = GetActiveNearbyRooms();

        DynamicSceneManager.GetInstance().RetainScene(RoomSceneName);
        //DynamicSceneManager.GetInstance().EnableChunks(roomChunks, RoomSceneName);

        foreach (string nearbySceneName in activeNearbyScenes)
        {
            if (!DynamicSceneManager.GetInstance().IsSceneLoaded(nearbySceneName))
            {
                DynamicSceneManager.GetInstance().RetainScene(nearbySceneName);
            }
        }

        HashSet<string> scenesToKeepLoaded = new HashSet<string>();

        scenesToKeepLoaded.Add(RoomSceneName);

        if (RoomManager.GetInstance() != null)
        {
            if (RoomManager.GetInstance().necessarySceneNamesToKeepLoaded != null)
                scenesToKeepLoaded.UnionWith(RoomManager.GetInstance().necessarySceneNamesToKeepLoaded);

            if (RoomManager.GetInstance()._nearbyRoomSceneNames != null)
                scenesToKeepLoaded.UnionWith(RoomManager.GetInstance()._nearbyRoomSceneNames);
        }

        for (int i = 0; i < SceneManager.sceneCount; i++)
        {
            Scene loadedScene = SceneManager.GetSceneAt(i);
            if (string.IsNullOrEmpty(loadedScene.name)) continue;

            if (!scenesToKeepLoaded.Contains(loadedScene.name))
            {
                DynamicSceneManager.GetInstance()?.UnloadSceneAsync(loadedScene.name);
            }
        }
    }

    private void OnTriggerExit(Collider other)
    {
        if (other.CompareTag("Player") && playerIsInTrigger)
        {
            playersPreviousRoomID = roomID;
            ClearCurrentRoomsHiddingSpots();
            ClearRoomDataTemporary();
            playerIsInTrigger = false;
        }

        if (other.CompareTag("EnemyAI") && enemyAIIsInTrigger)
        {
            enemyAIIsInTrigger = false;
        }
    }

    public void GetCurrentRoomsHideBehaviours()
    {
        foreach (ClosetHideBehaviour closet in closetHideBehaviour)
        {
            RoomManager.GetInstance().closetHideBehaviour.Add(closet);
        }

        foreach (BedHideBehaviourBase bed in bedHideBehaviour)
        {
            RoomManager.GetInstance().bedHideBehaviour.Add(bed);
        }
    }

    public List<Transform> GetPatrolPoints()
    {
        return roomPatrolPoints;
    }

    public void SetLastRoomTriggerPlayerEntered()
    {
        RoomManager.GetInstance().LastRoomTriggerPlayerEntered = this;
    }

    private void ClearRoomDataTemporary()
    {
        RoomManager.GetInstance().closetHideBehaviour.Clear();
        RoomManager.GetInstance().bedHideBehaviour.Clear();
        RoomManager.GetInstance().LastRoomTriggerPlayerEntered = null;
    }

    public void ClearNearbySceneNames()
    {
        RoomManager.GetInstance()._nearbyRoomSceneNames.Clear();
    }

    public void ClearCurrentRoomsHiddingSpots()
    {
        RoomManager.GetInstance().closetHideBehaviour.Clear();
        RoomManager.GetInstance().bedHideBehaviour.Clear();
    }

    public List<string> GetNearbySceneNames()
    {
        List<string> nearbyScenes = new List<string>();
        foreach (NearbyRoomCategory category in nearbyRoomCategories)
        {
            nearbyScenes.AddRange(category.nearbyRoomScenes.Select(scene => scene.SceneName));
        }
        return nearbyScenes;
    }
}