using System;
using TMPro;
using UnityEngine;
using UnityEngine.UI;

public class ActionUIHandler : MonoBehaviour
{
    #region Statication

    public static ActionUIHandler instance;

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

    #endregion
    private PlayerEntity selectedEntity;
    private RangedWeapon possibleRanged;
    [Header("Main UI")]
    [SerializeField] private GameObject actionUI;
    [SerializeField] private TextMeshProUGUI actionText;
    public bool opened;
    [Header("Info UI")] 
    [SerializeField] private GameObject infoUI;
    [SerializeField] private TextMeshProUGUI nameLabel;
    [SerializeField] private TextMeshProUGUI classLabel;
    [SerializeField] private Image unitPortrait;
    [SerializeField] private TextMeshProUGUI attackLabel;
    [SerializeField] private TextMeshProUGUI speedLabel;
    [SerializeField] private Transform healthBar;
    [SerializeField] private TextMeshProUGUI healthText;
    [Header("Action Buttons")]
    [SerializeField] private Button moveButton;
    [SerializeField] private Button attackButton;
    [SerializeField] private Button reloadButton;
    [SerializeField] private Button switchButton;

    [Header("Weapon Switcher")] 
    [SerializeField] private RectTransform weaponUIPanel;
    [SerializeField] private Button templateWeaponButton;
    [SerializeField] private float templateButtonHeight;
    
    //500 if statements in this script lol

    public void ShowUI(PlayerEntity target)
    {
        opened = true;
        possibleRanged = null;
        selectedEntity = target;
        actionUI.SetActive(true);
        actionText.gameObject.SetActive(true);
        infoUI.SetActive(true);
        UpdateUI();
    }

    public void UpdateUI()
    {
        if (selectedEntity.currentWeapon.TryGetComponent(out RangedWeapon isRanged))
        {
            possibleRanged = isRanged;
        }
        if (!isRanged || !isRanged.fired)
        {
            attackButton.gameObject.SetActive(true);
            reloadButton.gameObject.SetActive(false);
        }
        else
        {
            attackButton.gameObject.SetActive(false);
            if (isRanged && isRanged.fired)
            {
                if (selectedEntity.actions < 2)
                {
                    reloadButton.gameObject.SetActive(false);
                }
                else
                {
                    reloadButton.gameObject.SetActive(true);
                }
            }
        }
        moveButton.gameObject.SetActive(true);
        switchButton.gameObject.SetActive(true);
        actionText.text = $"Remaining Actions: {selectedEntity.actions}";
        UpdateInfo();
        if (selectedEntity.actions == 0)
        {
            HideUI();
        }
    }

    public void UpdateInfo()
    {
        healthBar.localScale = new Vector3(selectedEntity.health / selectedEntity.maxHealth,1,1);
        healthText.text = $"{selectedEntity.health}/{selectedEntity.maxHealth}";
        attackLabel.text = $"Attack: {selectedEntity.currentWeapon.damage}";
        speedLabel.text = $"Speed: {selectedEntity.maxMovement}";
    }
    public void HideUI()
    {
        opened = false;
        foreach (Transform uiObject in transform)
        {
            uiObject.gameObject.SetActive(false);
        }
        infoUI.SetActive(false);
    }

    public void ReloadGun()
    {
        possibleRanged.Reload();
        selectedEntity.actions -= 2;
        HideUI();
    }

    public void Attack()
    {
        selectedEntity.Attack();
        HideUI();
    }

    public void SkipTurn()
    {
        selectedEntity.SkipTurn();
        HideUI();
    }
    public void MoveEntity()
    {
        HideUI();
        PlayerEntityMovement.instance.SelectEntity(selectedEntity);
    }

    public void ShowWeaponList()
    {
        foreach (Transform oldButton in weaponUIPanel)
        {
            Destroy(oldButton.gameObject);
        }
        if (weaponUIPanel.gameObject.activeSelf)
        {
            HideWeaponList();
            return;
        }
        weaponUIPanel.gameObject.SetActive(true);
        weaponUIPanel.sizeDelta = new Vector2(weaponUIPanel.sizeDelta.x, templateButtonHeight * selectedEntity.weaponInstances.Count);
        foreach (Weapon weapon in selectedEntity.weaponInstances)
        {
            Button newButton = Instantiate(templateWeaponButton, weaponUIPanel);
            newButton.gameObject.SetActive(true);
            if (weapon != selectedEntity.currentWeapon)
            {
                newButton.onClick.AddListener(() => SelectWeapon(weapon));
                newButton.GetComponentInChildren<TextMeshProUGUI>().text = weapon.weaponName;
            }
            else
            {
                newButton.GetComponentInChildren<TextMeshProUGUI>().text = $"{weapon.weaponName} (Equipped)";
            }
        }
    }

    public void SelectWeapon(Weapon weaponSelected)
    {
        selectedEntity.actions--;
        selectedEntity.SwitchWeapon(weaponSelected);
        HideWeaponList();
        UpdateUI();
    }

    private void HideWeaponList()
    {
        weaponUIPanel.gameObject.SetActive(false);
    }
}