using System.Collections;
using UnityEngine;

public class ActiveInventory : Singleton<ActiveInventory>
{
    private int activeSlotIndexNum = 0; // Tracks the currently selected inventory slot

    private PlayerControls playerControls; // Manages player input controls

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

        playerControls = new PlayerControls(); // Set up the player input controls
    }

    private void Start()
    {
        // Listen for keyboard input to switch between inventory slots
        playerControls.Inventory.Keyboard.performed += ctx => ToggleActiveSlot((int)ctx.ReadValue<float>());
    }

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

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

    private void ToggleActiveSlot(int numValue)
    {
        ToggleActiveHighlight(numValue - 1); // Change the active slot based on the received input value
    }

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

        // Turn off the highlight for all inventory slots
        foreach (Transform inventorySlot in transform)
        {
            inventorySlot.GetChild(0).gameObject.SetActive(false); // Typically, index 0 refers to the highlight or indicator
        }

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

        // Switch the active weapon according to the selected slot
        ChangeActiveWeapon();
    }

    private void ChangeActiveWeapon()
    {
        // If there's a currently active weapon, remove it
        if (ActiveWeapon.Instance.CurrentActiveWeapon != null)
        {
            Destroy(ActiveWeapon.Instance.CurrentActiveWeapon.gameObject);
        }

        // Access the selected inventory slot and fetch its weapon information
        Transform childTransform = transform.GetChild(activeSlotIndexNum);
        InventorySlot inventorySlot = childTransform.GetComponentInChildren<InventorySlot>();
        WeaponInfo weaponInfo = inventorySlot.GetWeaponInfo();

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

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

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