using UnityEngine;
using UnityEngine.InputSystem;

[System.Serializable]
public enum ResourceNodeType
{
    Tree,
    Stone,
    Farm
}

public class ResourceNode : MonoBehaviour, ISelectable
{
    [Header("Resource Node Info")]
    public ResourceNodeType nodeType;
    public ResourceType resourceType;
    public int maxResources = 100;
    public int currentResources = 100;
    public float regenerationRate = 1f; // Resources per second when not being harvested

    [Header("Harvesting")]
    public bool isBeingHarvested = false;
    public Villager currentHarvester;
    public float harvestTime = 3f;

    [Header("Visual")]
    public Renderer nodeRenderer;
    public GameObject selectionIndicator;
    public GameObject depletedVisual;

    private bool isSelected = false;
    private float lastRegenerationTime;

    public bool IsAvailable => currentResources > 0;
    public bool IsOccupied => isBeingHarvested && currentHarvester != null;
    public float ResourcePercentage => (float)currentResources / maxResources;

    void Start()
    {
        lastRegenerationTime = Time.time;

        if (selectionIndicator != null)
            selectionIndicator.SetActive(false);

        if (depletedVisual != null)
            depletedVisual.SetActive(false);

        SetAppropriateTag();
        UpdateVisualState();
    }

    void SetAppropriateTag()
    {
        gameObject.tag = nodeType switch
        {
            ResourceNodeType.Tree => "Tree",
            ResourceNodeType.Stone => "Stone",
            ResourceNodeType.Farm => "Farm",
            _ => "Untagged"
        };
    }

    void Update()
    {
        // Regenerate resources over time if not being harvested
        if (!isBeingHarvested && currentResources < maxResources)
        {
            float timeSinceLastRegen = Time.time - lastRegenerationTime;
            if (timeSinceLastRegen >= 1f) // Regenerate every second
            {
                int regenAmount = Mathf.FloorToInt(regenerationRate);
                AddResources(regenAmount);
                lastRegenerationTime = Time.time;
            }
        }
    }

    public bool StartHarvesting(Villager harvester)
    {
        if (IsOccupied || !IsAvailable)
            return false;

        isBeingHarvested = true;
        currentHarvester = harvester;
        Debug.Log($"{harvester.villagerName} started harvesting {nodeType}");
        return true;
    }

    public void StopHarvesting()
    {
        isBeingHarvested = false;
        currentHarvester = null;
        Debug.Log($"Stopped harvesting {nodeType}");
    }

    public int HarvestResources(int requestedAmount, float harvesterEfficiency)
    {
        if (!IsAvailable || !isBeingHarvested)
            return 0;

        // Calculate actual harvest amount based on efficiency and available resources
        int baseAmount = Mathf.Min(requestedAmount, currentResources);
        int harvestedAmount = Mathf.RoundToInt(baseAmount * harvesterEfficiency);

        currentResources -= harvestedAmount;
        currentResources = Mathf.Max(0, currentResources);

        UpdateVisualState();

        Debug.Log($"Harvested {harvestedAmount} {resourceType} from {nodeType}. Remaining: {currentResources}");
        return harvestedAmount;
    }

    public void AddResources(int amount)
    {
        currentResources = Mathf.Min(maxResources, currentResources + amount);
        UpdateVisualState();
    }

    void UpdateVisualState()
    {
        if (nodeRenderer != null)
        {
            // Change color based on resource percentage
            Color baseColor = nodeType switch
            {
                ResourceNodeType.Tree => Color.green,
                ResourceNodeType.Stone => Color.gray,
                ResourceNodeType.Farm => Color.yellow,
                _ => Color.white
            };

            // Fade color based on resources remaining
            float intensity = Mathf.Lerp(0.3f, 1f, ResourcePercentage);
            nodeRenderer.material.color = baseColor * intensity;
        }

        // Show depleted visual if empty
        if (depletedVisual != null)
        {
            depletedVisual.SetActive(currentResources == 0);
        }
    }

    public void OnSelected()
    {
        isSelected = true;
        if (selectionIndicator != null)
            selectionIndicator.SetActive(true);
    }

    public void OnDeselected()
    {
        isSelected = false;
        if (selectionIndicator != null)
            selectionIndicator.SetActive(false);
    }

    public string GetNodeInfo()
    {
        string status = isBeingHarvested ? "Being Harvested" : "Available";
        if (currentHarvester != null)
            status += $" by {currentHarvester.villagerName}";

        return $"{nodeType} Node\nResources: {currentResources}/{maxResources}\nStatus: {status}";
    }

    void OnMouseDown()
    {
        if (Mouse.current != null && Mouse.current.leftButton.wasPressedThisFrame)
        {
            if (GameManager.Instance?.selectionManager != null)
            {
                GameManager.Instance.selectionManager.SelectObject(gameObject);
            }
        }
    }
}