using OTGIntegrated.Abilities;
using OTGIntegrated.Crafting;
using OTGIntegrated.Dialogue;
using OTGIntegrated.Inventory;
using OTGIntegrated.Player;
using OTGIntegrated.Quests;
using OTGIntegrated.Save;
using OTGIntegrated.Stats;
using OTGIntegrated.Talents;
using OTGIntegrated.UI;
using OTGIntegrated.Weapons;
using UnityEngine;

namespace OTGIntegrated.Core
{
    public sealed class GameManager : MonoBehaviour
    {
        public static GameManager Instance { get; private set; }

        [Header("Player")]
        public PlayerController playerController;
        public PlayerStats playerStats;
        public OTGIntegrated.Inventory.Inventory inventory;
        public LevelSystem levelSystem;
        public WeaponManager weaponManager;
        public AbilityManager abilityManager;
        public TalentManager talentManager;

        [Header("World Systems")]
        public QuestManager questManager;
        public DialogueManager dialogueManager;
        public CraftingSystem craftingSystem;

        [Header("UI / Save")]
        public UIManager uiManager;
        public SaveSystem saveSystem;

        private bool initialized;

        private void Awake()
        {
            if (Instance != null && Instance != this)
            {
                Destroy(gameObject);
                return;
            }

            Instance = this;
            ResolveMissingReferences();
            InitializeSystems();
        }

        public void ResolveMissingReferences()
        {
            if (playerController == null) playerController = FindObjectOfType<PlayerController>();
            if (playerStats == null) playerStats = FindObjectOfType<PlayerStats>();
            if (inventory == null) inventory = FindObjectOfType<OTGIntegrated.Inventory.Inventory>();
            if (levelSystem == null) levelSystem = FindObjectOfType<LevelSystem>();
            if (weaponManager == null) weaponManager = FindObjectOfType<WeaponManager>();
            if (abilityManager == null) abilityManager = FindObjectOfType<AbilityManager>();
            if (talentManager == null) talentManager = FindObjectOfType<TalentManager>();
            if (questManager == null) questManager = FindObjectOfType<QuestManager>();
            if (dialogueManager == null) dialogueManager = FindObjectOfType<DialogueManager>();
            if (craftingSystem == null) craftingSystem = FindObjectOfType<CraftingSystem>();
            if (uiManager == null) uiManager = FindObjectOfType<UIManager>();
            if (saveSystem == null) saveSystem = FindObjectOfType<SaveSystem>();
        }

        public void InitializeSystems()
        {
            if (initialized)
            {
                return;
            }

            if (playerController != null) playerController.Initialize(playerStats);
            if (levelSystem != null) levelSystem.Initialize(talentManager);
            if (weaponManager != null) weaponManager.Initialize(playerStats, inventory);
            if (abilityManager != null) abilityManager.Initialize(playerStats);
            if (talentManager != null) talentManager.Initialize(playerStats);
            if (questManager != null) questManager.Initialize(inventory, levelSystem, talentManager);
            if (dialogueManager != null) dialogueManager.Initialize(questManager, uiManager, playerController);
            if (craftingSystem != null) craftingSystem.Initialize(inventory, uiManager);
            if (uiManager != null) uiManager.Initialize(playerController);
            if (saveSystem != null) saveSystem.Initialize(this);

            ValidateReferences();
            initialized = true;
        }

        private void ValidateReferences()
        {
            Require(playerStats, "PlayerStats");
            Require(inventory, "Inventory");
            Require(levelSystem, "LevelSystem");
            Require(weaponManager, "WeaponManager");
            Require(abilityManager, "AbilityManager");
            Require(talentManager, "TalentManager");
            Require(questManager, "QuestManager");
            Require(dialogueManager, "DialogueManager");
            Require(craftingSystem, "CraftingSystem");
            Require(uiManager, "UIManager");
            Require(saveSystem, "SaveSystem");
        }

        private void Require(Object value, string label)
        {
            if (value == null)
            {
                Debug.LogWarning($"GameManager reference is missing: {label}", this);
            }
        }
    }
}