using UnityEngine;
using System.Collections.Generic;
using UnityEngine.UI;

public class UI_QuestBoard : UI_WindowBase
{
    [Header("Quest Board Specific")]
    [SerializeField] private GameObject questPrefab; 
    [SerializeField] private Transform container;    

    private List<UI_QuestItem> _instantiatedItems = new List<UI_QuestItem>();

    protected override void Awake()
    {
        base.Awake();
        // Проверка ссылок в инспекторе
        if (questPrefab == null) Debug.LogError($"[UI_QuestBoard] {gameObject.name}: Quest Prefab is MISSING!", this);
        if (container == null) Debug.LogError($"[UI_QuestBoard] {gameObject.name}: Container Transform is MISSING!", this);
    }

    private void OnEnable()
    {
        MANAGER_RemoteData.OnDataLoaded += RefreshBoard;
        MANAGER_GameEvents.OnUIUpdateNeeded += UpdateVisuals;

        // Проверяем данные при включении
        if (MANAGER_WindowsBase.Instance != null && MANAGER_WindowsBase.Instance.RemoteData.currentData != null)
        {
            Debug.Log("[UI_QuestBoard] Data already exists on Enable, refreshing...");
            RefreshBoard();
        }
    }

    private void OnDisable()
    {
        MANAGER_RemoteData.OnDataLoaded -= RefreshBoard;
        MANAGER_GameEvents.OnUIUpdateNeeded -= UpdateVisuals;
    }

    public override void OpenWindow()
    {
        Debug.Log("[UI_QuestBoard] OpenWindow called.");
        base.OpenWindow(); 
        RefreshBoard();
    }

    private void RefreshBoard()
    {
        Debug.Log("[UI_QuestBoard] Refreshing Board...");

        // 1. Очистка
        int countBefore = _instantiatedItems.Count;
        foreach (var item in _instantiatedItems) 
        {
            if (item != null) Destroy(item.gameObject);
        }
        _instantiatedItems.Clear();
        Debug.Log($"[UI_QuestBoard] Cleared {countBefore} old items.");

        // 2. Проверка менеджеров
        if (MANAGER_WindowsBase.Instance == null)
        {
            Debug.LogError("[UI_QuestBoard] MANAGER_WindowsBase.Instance is NULL!");
            return;
        }

        var data = MANAGER_WindowsBase.Instance.RemoteData.currentData;
        if (data == null)
        {
            Debug.LogWarning("[UI_QuestBoard] currentData is NULL. Waiting for data...");
            return;
        }

        var quests = data.quests;
        if (quests == null || quests.Count == 0)
        {
            Debug.LogWarning("[UI_QuestBoard] Quests list is NULL or EMPTY in data.");
            return;
        }

        Debug.Log($"[UI_QuestBoard] Found {quests.Count} quests in data. Starting Instantiation...");

        // 3. Спавн
        foreach (var questData in quests)
        {
            if (questData == null)
            {
                Debug.LogWarning("[UI_QuestBoard] Encountered null questData in list.");
                continue;
            }

            GameObject go = Instantiate(questPrefab, container);
            
            // Проверка на корректность RectTransform (частая проблема UI)
            if (go.transform.localScale != Vector3.one) go.transform.localScale = Vector3.one;

            UI_QuestItem script = go.GetComponent<UI_QuestItem>();
            if (script != null)
            {
                script.Setup(questData);
                _instantiatedItems.Add(script);
                Debug.Log($"[UI_QuestBoard] Successfully spawned quest: {questData.title}");
            }
            else
            {
                Debug.LogError($"[UI_QuestBoard] Prefab '{go.name}' is missing UI_QuestItem component!", go);
            }
        }

        // 4. Форсируем обновление UI
        LayoutRebuilder.ForceRebuildLayoutImmediate(container.GetComponent<RectTransform>());
        Debug.Log("[UI_QuestBoard] Refresh Complete.");
    }

    private void UpdateVisuals()
    {
        Debug.Log("[UI_QuestBoard] Updating Visuals for all items...");
        foreach (var item in _instantiatedItems)
        {
            if (item != null) item.UpdateUI();
        }
    }
}