using System.Collections;
using UnityEngine;
using UnityEngine.InputSystem;

public class AButtonPress : MonoBehaviour
{
    [Header("Target")]
    [SerializeField] private RectTransform buttonRect;           // your Button image RectTransform

    [Header("Input")]
    [SerializeField] private InputActionReference advanceAction; // same action you use to advance text

    [Header("Active Guard (optional but recommended)")]
    [SerializeField] private CanvasGroup textboxCanvas;          // the CanvasGroup of your textbox
    [SerializeField] private float visibleCutoff = 0.95f;        // only animate when alpha >= this

    [Header("Motion")]
    [SerializeField] private float offsetY = -6f;                // “few millimeters” in UI pixels
    [SerializeField] private float downTime = 0.06f;
    [SerializeField] private float upTime = 0.08f;

    Vector2 startPos;
    Coroutine anim;

    void Awake()
    {
        if (!buttonRect) buttonRect = GetComponent<RectTransform>();
        if (buttonRect) startPos = buttonRect.anchoredPosition;
    }

    void OnEnable()
    {
        if (advanceAction != null)
        {
            advanceAction.action.performed += OnAdvance;
            advanceAction.action.Enable();
        }
    }

    void OnDisable()
    {
        if (advanceAction != null)
        {
            advanceAction.action.performed -= OnAdvance;
            advanceAction.action.Disable();
        }
    }

    void OnAdvance(InputAction.CallbackContext _)
    {
        if (!buttonRect) return;

        // Only while textbox is “on”
        if (textboxCanvas && textboxCanvas.alpha < visibleCutoff) return;

        if (anim != null) StopCoroutine(anim);
        anim = StartCoroutine(PressOnce());
    }

    IEnumerator PressOnce()
    {
        Vector2 downPos = startPos + new Vector2(0f, offsetY);

        // down
        float t = 0f;
        while (t < 1f)
        {
            t += Time.unscaledDeltaTime / downTime;
            float k = Mathf.SmoothStep(0f, 1f, Mathf.Clamp01(t));
            buttonRect.anchoredPosition = Vector2.LerpUnclamped(startPos, downPos, k);
            yield return null;
        }

        // up
        t = 0f;
        while (t < 1f)
        {
            t += Time.unscaledDeltaTime / upTime;
            float k = Mathf.SmoothStep(0f, 1f, Mathf.Clamp01(t));
            buttonRect.anchoredPosition = Vector2.LerpUnclamped(downPos, startPos, k);
            yield return null;
        }

        anim = null;
    }

    // If you’d rather trigger from your textbox script:
    public void Pulse()
    {
        if (anim != null) StopCoroutine(anim);
        anim = StartCoroutine(PressOnce());
    }
}