using UnityEngine;
using EasyTalk.Controller;
using EasyTalk.Nodes;

public enum NPCType
{
    Villager,
    Merchant,
    Trainer,
    Guard,
    QuestGiver,
    Other
}

public class NPC : Character
{
    [Header("NPC Settings")]
    public string npcName = "NPC";
    public NPCType npcType = NPCType.Villager;

    [Header("Debug")]
    [SerializeField]
    private bool enableDebugLogs = false;
    
    [Header("Interaction Capabilities")]
    public bool hasDialogue = true;
    public bool isQuestGiver = false;
    public bool isMerchant = false;
    public bool isTrainer = false;
    
    [Header("EasyTalk Integration")]
    [Tooltip("The Dialogue asset for this NPC. Will be loaded into the central DialogueController.")]
    public Dialogue dialogue;
    [Tooltip("Optional: Entry point name for starting dialogue. Leave empty to use default entry point.")]
    public string dialogueEntryPoint = "";
    [Tooltip("Name of the GameObject with the central DialogueController. Leave empty to auto-find.")]
    public string dialogueManagerName = "Manager";
    
    // Cache the central DialogueController
    private static DialogueController centralDialogueController;
    
    [Header("Fallback Dialogue (if no EasyTalk)")]
    [TextArea(3, 10)]
    public string greetingText = "Hello, traveler!";
    
    [Header("Quest")]
    public string questId = ""; // ID of the quest this NPC offers
    
    [Header("Merchant Settings")]
    [Tooltip("Gold required to access merchant services")]
    public int merchantGoldRequirement = 0;
    
    [Header("Trainer Settings")]
    [Tooltip("Skills this trainer can teach")]
    public string[] trainableSkills;
    public int trainingCost = 100;

    /// <summary>
    /// Called when player interacts with this NPC
    /// </summary>
    public virtual void OnInteract(GameObject player)
    {
        Log($"Interacting with {npcName} ({npcType})");
        
        if (hasDialogue)
        {
            ShowDialogue();
        }
        
        if (isQuestGiver && !string.IsNullOrEmpty(questId))
        {
            //OfferQuest(player);
        }
        
        if (isMerchant)
        {
            OpenMerchantInterface(player);
        }
        
        if (isTrainer)
        {
            OpenTrainingInterface(player);
        }
    }

    /// <summary>
    /// Display dialogue for this NPC using EasyTalk with centralized DialogueController
    /// </summary>
    protected virtual void ShowDialogue()
    {
        // Find the central DialogueController if not cached
        if (centralDialogueController == null)
        {
            centralDialogueController = FindCentralDialogueController();
        }

        // Check if we have both a controller and dialogue asset
        if (centralDialogueController != null && dialogue != null)
        {
            // Load this NPC's dialogue into the central controller
            centralDialogueController.ChangeDialogue(dialogue);
            
            // Play dialogue with optional entry point
            if (!string.IsNullOrEmpty(dialogueEntryPoint))
            {
                centralDialogueController.PlayDialogue(dialogueEntryPoint);
                Log($"{npcName}: Starting EasyTalk dialogue at entry point '{dialogueEntryPoint}'");
            }
            else
            {
                centralDialogueController.PlayDialogue();
                Log($"{npcName}: Starting EasyTalk dialogue");
            }
        }
        else
        {
            // Fallback to simple greeting if no EasyTalk setup
            if (centralDialogueController == null)
            {
                Debug.LogWarning($"No central DialogueController found. Make sure there's a DialogueController on a GameObject named '{dialogueManagerName}'.", gameObject);
            }
            if (dialogue == null)
            {
                Debug.LogWarning($"No Dialogue asset assigned to {npcName}. Assign a Dialogue asset in the inspector.", gameObject);
            }
            
            Log($"{npcName}: {greetingText}");
        }
    }
    
    /// <summary>
    /// Finds the central DialogueController in the scene
    /// </summary>
    private DialogueController FindCentralDialogueController()
    {
        // First, try to find by the specified manager name
        if (!string.IsNullOrEmpty(dialogueManagerName))
        {
            GameObject manager = GameObject.Find(dialogueManagerName);
            if (manager != null)
            {
                DialogueController controller = manager.GetComponent<DialogueController>();
                if (controller != null)
                {
                    Log($"Found central DialogueController on '{dialogueManagerName}'");
                    return controller;
                }
            }
        }
        
        // Fallback: search for any DialogueController in the scene
        DialogueController foundController = FindAnyObjectByType<DialogueController>();
        if (foundController != null)
        {
            Log($"Found DialogueController via FindAnyObjectByType on '{foundController.gameObject.name}'");
            return foundController;
        }
        
        return null;
    }

    /// <summary>
    /// Offer quest to the player
    /// </summary>
    protected virtual void OfferQuest(GameObject player)
    {
        if (QuestManager.Instance == null)
        {
            Debug.LogWarning("QuestManager not found in scene. Cannot offer quest.", gameObject);
            return;
        }

        if (string.IsNullOrEmpty(questId))
        {
            Debug.LogWarning($"{npcName} has no questId assigned.", gameObject);
            return;
        }

        // Check if player can accept this quest
        if (QuestManager.Instance.CanAcceptQuest(questId))
        {
            // Start the quest
            bool started = QuestManager.Instance.StartQuest(questId);
            if (started)
            {
                Log($"{npcName} gave quest '{questId}' to player!");
            }
        }
        else if (QuestManager.Instance.IsQuestActive(questId))
        {
            // Quest already active - check if it can be turned in
            Quest activeQuest = QuestManager.Instance.GetActiveQuest(questId);
            if (activeQuest != null && activeQuest.IsComplete())
            {
                Log($"{npcName}: You've completed the quest! Turn it in.");
                // Player should use CompleteQuestWithNPC method or turn-in dialogue option
            }
            else
            {
                Log($"{npcName}: You already have this quest active.");
            }
        }
        else if (QuestManager.Instance.IsQuestCompleted(questId))
        {
            Log($"{npcName}: You've already completed this quest.");
        }
        else
        {
            Log($"{npcName}: You don't meet the requirements for this quest yet.");
        }
    }
    
    /// <summary>
    /// Complete a quest with this NPC (quest turn-in)
    /// </summary>
    public virtual bool CompleteQuestWithNPC(string questIdToComplete)
    {
        if (QuestManager.Instance == null)
        {
            Debug.LogWarning("QuestManager not found in scene.", gameObject);
            return false;
        }

        Quest quest = QuestManager.Instance.GetActiveQuest(questIdToComplete);
        if (quest != null && quest.IsComplete())
        {
            bool completed = QuestManager.Instance.CompleteQuest(questIdToComplete);
            if (completed)
            {
                Log($"{npcName}: Quest complete! Here's your reward.");
                return true;
            }
        }
        else
        {
            Log($"{npcName}: You haven't completed that quest yet.");
        }
        
        return false;
    }

    /// <summary>
    /// Open merchant trading interface
    /// </summary>
    protected virtual void OpenMerchantInterface(GameObject player)
    {
        Debug.Log($"Opening merchant interface for {npcName}", gameObject);
        // TODO: Implement merchant UI
    }

    /// <summary>
    /// Open training interface for learning skills
    /// </summary>
    protected virtual void OpenTrainingInterface(GameObject player)
    {
        Debug.Log($"Opening training interface for {npcName}", gameObject);
        // TODO: Implement training UI
    }

    /// <summary>
    /// Check if this NPC can perform a specific service
    /// </summary>
    public bool CanProvideService(NPCType serviceType)
    {
        return npcType == serviceType || 
               (serviceType == NPCType.Merchant && isMerchant) ||
               (serviceType == NPCType.Trainer && isTrainer) ||
               (serviceType == NPCType.QuestGiver && isQuestGiver);
    }

    /// <summary>
    /// NPCs don't die by default - override for hostile NPCs
    /// </summary>
    public override void Die()
    {
        Log($"{npcName} has been defeated!");
        // NPCs might drop loot, give quest credit, etc.
        base.Die();
    }

    private void Log(string message)
    {
        if (enableDebugLogs)
        {
            Debug.Log(message);
        }
    }
}