using TMPro;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;

public class Territory : MonoBehaviour, IPointerDownHandler
{
    private Vector3 upperCorner;
    public BoundsInt area;
    public GameObject windowPrefab;
    public int crystalsAmount;
    
    private SpriteRenderer sr;

    private void Start()
    {
        sr = GetComponent<SpriteRenderer>();
        Bounds bounds = GetComponent<PolygonCollider2D>().bounds;
        upperCorner = new Vector3(transform.position.x, bounds.min.y);
        
        Vector3Int cellPosition = BuildingSystem.current.gridLayout.LocalToCell(upperCorner);
        area.position = cellPosition + new Vector3Int(1, 1, 0);
        BuildingSystem.current.LockTerritory(area);
        Deselect();
    }

    public void OnPointerDown(PointerEventData eventData)
    {
        GameObject holder = Instantiate(windowPrefab, GameManager.current.canvas.transform);
        Transform window = holder.transform.GetChild(0);
        
        holder.GetComponent<Button>().onClick.AddListener(delegate
            {
                Destroy(holder.gameObject);
                Deselect();
            });
        
        window.Find("Close Button").GetComponent<Button>().onClick.AddListener(delegate
        {
            Destroy(holder.gameObject);
            Deselect();
        });

        window.Find("Buy Button").GetComponent<Button>().onClick.AddListener(delegate
        {
            Destroy(holder.gameObject);
            Deselect();
            
            EventManager.Instance.AddListenerOnce<EnoughCurrencyGameEvent>(OnEnoughCurrency);
            EventManager.Instance.AddListenerOnce<NotEnoughCurrencyGameEvent>(OnNotEnoughCurrency);

            CurrencyChangeGameEvent info = new CurrencyChangeGameEvent(-crystalsAmount, CurrencyType.Crystals);
            EventManager.Instance.QueueEvent(info);
        });

        window.Find("Amount Text").GetComponent<TextMeshProUGUI>().text = crystalsAmount.ToString();

        PanZoom.current.Focus(transform.position);
        Select();
    }

    private void Select()
    {
        Color color = sr.color;
        color.a = 0.8f;
        sr.color = color;
    }
    
    private void Deselect()
    {
        Color color = sr.color;
        color.a = 0.2f;
        sr.color = color;
    }
    
    private void UnlockTerritory()
    {
        BuildingSystem.current.UnlockTerritory(area);
        Destroy(gameObject);
    }

    private void OnEnoughCurrency(EnoughCurrencyGameEvent info)
    {
        UnlockTerritory();
        EventManager.Instance.RemoveListener<NotEnoughCurrencyGameEvent>(OnNotEnoughCurrency);
    }

    private void OnNotEnoughCurrency(NotEnoughCurrencyGameEvent info)
    {
        EventManager.Instance.RemoveListener<EnoughCurrencyGameEvent>(OnEnoughCurrency);
    }
}