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

[RequireComponent(typeof(CanvasGroup))]
public class UIAlert : MonoBehaviour
{
    private string title;
    private string message;

    private string okButtonText = "확인";
    private string cancelButtonText = "취소";

    private bool showCancelButton = false;

    public UnityEvent OnOk;
    public UnityEvent OnCancel;

    private Button okButton;
    private Button cancelButton;
    private TextMeshProUGUI titleText;
    private TextMeshProUGUI messageText;
    private CanvasGroup canvasGroup;

    private bool animatting = false;

    private float target = 0;
    private float duration = 0.25f;
    private float alpha = 1;

    private bool useKeyboard = false;

    public void Init(string title, string message, string okButtonText = "확인", string cancelButtonText = "취소", bool showCancelButton = true)
    {

        this.title = title;
        this.message = message;
        this.okButtonText = okButtonText;
        this.cancelButtonText = cancelButtonText;
        this.showCancelButton = showCancelButton;

        canvasGroup = GetComponent<CanvasGroup>();

        var okBtn = GetComponentInChildren<UIPopupButtonOk>();
        var cancelBtn = GetComponentInChildren<UIPopupButtonCancel>();
        var titleTxt = GetComponentInChildren<UIPopupTitle>();
        var messageTxt = GetComponentInChildren<UIPopupMessage>();


        if (okButton == null) okButton = okBtn.GetComponent<Button>();

        if (okButton != null)
        {
            if (useKeyboard) okButton.navigation = new Navigation() { mode = Navigation.Mode.None };
            okButton.GetComponentInChildren<TextMeshProUGUI>().text = okButtonText;
            okButton.onClick.AddListener(() =>
            {
                if (OnOk != null) OnOk.Invoke();
                Close();
            });
        }

        if (cancelButton == null) cancelButton = cancelBtn.GetComponent<Button>();

        if (cancelButton != null)
        {
            if (useKeyboard) cancelButton.navigation = new Navigation() { mode = Navigation.Mode.None };
            if (showCancelButton)
            {
                cancelButton.gameObject.SetActive(true);
                cancelButton.GetComponentInChildren<TextMeshProUGUI>().text = cancelButtonText;
                cancelButton.onClick.AddListener(() =>
                {
                    if (OnCancel != null) OnCancel.Invoke();
                    Close();
                });
            }
            else
            {
                cancelButton.gameObject.SetActive(false);
            }
        }

        if (titleTxt != null)
        {
            titleText = titleTxt.GetComponent<TextMeshProUGUI>();
            titleText.text = title;
        }

        if (messageTxt != null)
        {
            messageText = messageTxt.GetComponent<TextMeshProUGUI>();
            messageText.text = message;
        }

        canvasGroup.alpha = 0;
        canvasGroup.interactable = false;
        canvasGroup.blocksRaycasts = false;
    }

    public void Open()
    {
        canvasGroup.interactable = true;
        canvasGroup.blocksRaycasts = true;
        target = 1;
        alpha = canvasGroup.alpha;
        animatting = true;
    }

    public void Close()
    {
        target = 0;
        alpha = canvasGroup.alpha;
        animatting = true;
    }


    void LateUpdate()
    {
        if (animatting)
        {
            if (duration < 0)
            {
                duration = 0.001f;
            }

            alpha = Mathf.MoveTowards(alpha, target, (1 / duration) * Time.deltaTime);
            canvasGroup.alpha = alpha;
            if (alpha == target)
            {
                if (target == 0)
                {
                    Destroy(gameObject);
                }
                animatting = false;
            }
        }
        else
        {
            if (alpha == 1 && target == 1 && useKeyboard)
            {
                if (Input.GetKeyDown(KeyCode.Escape))
                {
                    if (showCancelButton)
                    {
                        cancelButton.OnPointerDown(new UnityEngine.EventSystems.PointerEventData(EventSystem.current));
                    }
                }
                else if (Input.GetKeyUp(KeyCode.Escape))
                {
                    if (showCancelButton)
                    {
                        cancelButton.OnPointerUp(new UnityEngine.EventSystems.PointerEventData(EventSystem.current));
                    }
                    if (OnCancel != null) OnCancel.Invoke();
                    Close();
                }
                else if (Input.GetKeyDown(KeyCode.Space))
                {
                    okButton.OnPointerDown(new UnityEngine.EventSystems.PointerEventData(EventSystem.current));
                }
                else if (Input.GetKeyUp(KeyCode.Space))
                {
                    okButton.OnPointerUp(new UnityEngine.EventSystems.PointerEventData(EventSystem.current));
                    if (OnOk != null) OnOk.Invoke();
                    Close();
                }
            }
        }
    }



    private void OnDestroy()
    {
        if (okButton != null)
        {
            okButton.onClick.RemoveAllListeners();
        }

        if (cancelButton != null)
        {
            cancelButton.onClick.RemoveAllListeners();
        }

        if (OnOk != null)
        {
            OnOk.RemoveAllListeners();
            OnOk = null;
        }

        if (OnCancel != null)
        {
            OnCancel.RemoveAllListeners();
            OnCancel = null;
        }
    }
}