using System.Collections;
using UnityEngine;

public class ActiveInventory : Singleton<ActiveInventory>
{
    private int activeSlotIndexNum = 0; // Index number of the currently active inventory slot

    private PlayerControls playerControls; // Player input controls

    protected override void Awake()
    {
        base.Awake();

        playerControls = new PlayerControls(); // Initialize player controls
    }

    private void Start()
    {
        // Subscribe to the keyboard input event for toggling active slots
        playerControls.Inventory.Keyboard.performed += ctx => ToggleActiveSlot((int)ctx.ReadValue<float>());
    }

    private void OnEnable()
    {
        playerControls.Enable(); // Enable player controls when this script is enabled
    }

    public void EquipStartingWeapon()
    {
        ToggleActiveHighlight(0); // Equip the starting weapon by highlighting the first inventory slot
    }

    private void ToggleActiveSlot(int numValue)
    {
        ToggleActiveHighlight(numValue - 1); // Toggle active highlight based on the numeric value received from input
    }

    private void ToggleActiveHighlight(int indexNum)
    {
        activeSlotIndexNum = indexNum; // Set the active slot index number

        // Deactivate highlight for all inventory slots
        foreach (Transform inventorySlot in transform)
        {
            inventorySlot.GetChild(0).gameObject.SetActive(false); // Assuming index 0 is the highlight or indicator
        }

        // Activate highlight for the selected inventory slot
        transform.GetChild(indexNum).GetChild(0).gameObject.SetActive(true);

        // Change the active weapon based on the selected inventory slot
        ChangeActiveWeapon();
    }

    private void ChangeActiveWeapon()
    {
        // Destroy the current active weapon if it exists
        if (ActiveWeapon.Instance.CurrentActiveWeapon != null)
        {
            Destroy(ActiveWeapon.Instance.CurrentActiveWeapon.gameObject);
        }

        // Get the selected inventory slot and retrieve the weapon info
        Transform childTransform = transform.GetChild(activeSlotIndexNum);
        InventorySlot inventorySlot = childTransform.GetComponentInChildren<InventorySlot>();
        WeaponInfo weaponInfo = inventorySlot.GetWeaponInfo();

        // If no weapon info is found, set the active weapon to null and return
        if (weaponInfo == null)
        {
            ActiveWeapon.Instance.WeaponNull();
            return;
        }

        // Instantiate the new weapon prefab and assign it as the active weapon
        GameObject weaponToSpawn = weaponInfo.weaponPrefab;
        GameObject newWeapon = Instantiate(weaponToSpawn, ActiveWeapon.Instance.transform);

        ActiveWeapon.Instance.NewWeapon(newWeapon.GetComponent<MonoBehaviour>());
    }
}