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

public class AbilityUIHandler : MonoBehaviour
{
    #region Statication

    public static AbilityUIHandler instance;

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

    #endregion
    [Header("Abilities")]
    public List<Button> uiObjects = new();
    [SerializeField] private MarisaAbilityHandler playerAbilityHandler;
    [SerializeField] private AbilityUIObject abilityUI;

    [Header("Upgrades")] 
    [SerializeField] private Transform upgradeGrid;
    [SerializeField] private StoredAbilityUpgradeUI templateStoredUpgradeUI;

    private void Start()
    {
        UpdateAbilitySelection();
    }

    public void UpdateInventory()
    {
        foreach (Transform child in upgradeGrid) //awful but we'll go with it for now
        {
            Destroy(child.gameObject);
        }
        foreach (AbilityUpgrade upgrade in AbilityManager.instance.allUpgrades)
        {
            int upgradeCount = AbilityManager.instance.GetUpgradeCount(upgrade);
            if (upgradeCount > 0)
            {
                StoredAbilityUpgradeUI newUI = Instantiate(templateStoredUpgradeUI, upgradeGrid);
                newUI.SetUpgrade(upgrade, upgradeCount);   
            }
        }
    }

    public void UpdateAbilitySelection()
    {
        uiObjects[0].onClick.AddListener(() => ShowAbilityUI(playerAbilityHandler.mainAttackInstance));
        uiObjects[1].onClick.AddListener(() => ShowAbilityUI(playerAbilityHandler.secondaryAttackInstance));
        uiObjects[2].onClick.AddListener(() => ShowAbilityUI(playerAbilityHandler.spellAInstance));
        uiObjects[3].onClick.AddListener(() => ShowAbilityUI(playerAbilityHandler.spellBInstance));
    }

    public void ShowAbilityUI(PlayerAbility ability)
    {
        abilityUI.thisAbility = ability;
        abilityUI.UpdateUI();
    }
}