using Cysharp.Threading.Tasks;
using UnityEngine;
using UnityEngine.UI;

/// <summary>
/// 文本提示界面：外部传入文本内容和世界坐标系位置
/// </summary>
public class SmallTipWin : UIBase
{

    [SerializeField] RectTransform rectTransform;
    [SerializeField] RectTransform arrowImage;
    [SerializeField] RectTransform arrowUpImage;
    [SerializeField] Text descText;

    public static Vector3 worldPos; //世界坐标系位置
    public static string showText;
    public static bool isDownShow = false;  // 是否向下显示

    protected override void OnPreOpen()
    {
        descText.text = showText;
        rectTransform.position = new Vector3(100, 100, 100);   //初始化时，屏幕范围外
        arrowImage.SetActive(!isDownShow);
        arrowUpImage.SetActive(isDownShow);
    }

    protected override void OnPreClose()
    {
        isDownShow = false;
    }
    

    protected override void OnOpen()
    {
        UpdatePos().Forget();
    }

    async UniTask UpdatePos()
    {
        await UniTask.DelayFrame(3);
        // 限制在屏幕范围内
        Vector3[] corners = new Vector3[4];
        rectTransform.GetWorldCorners(corners);

        float minY = corners[0].y;
        float maxY = corners[0].y;

        for (int i = 1; i < corners.Length; i++)
        {
            if (corners[i].y < minY) minY = corners[i].y;
            if (corners[i].y > maxY) maxY = corners[i].y;
        }


        float screenHeight = maxY - minY;
        Vector2 adjustedPos = new Vector2(worldPos.x, worldPos.y + (!isDownShow ? screenHeight * 0.5f : -screenHeight * 0.5f));

        Vector2 screenAdjustedPos = CameraManager.uiCamera.WorldToScreenPoint(adjustedPos);
        var rectWidth = rectTransform.rect.width * Screen.width / canvasScaler.referenceResolution.x;
        screenAdjustedPos.x = Mathf.Clamp(screenAdjustedPos.x, rectWidth * 0.5f, Screen.width - rectWidth * 0.5f);
        screenAdjustedPos.y = Mathf.Clamp(screenAdjustedPos.y, rectTransform.rect.height * 0.5f, Screen.height - rectTransform.rect.height * 0.5f - 15);

        adjustedPos = CameraManager.uiCamera.ScreenToWorldPoint(screenAdjustedPos);
        rectTransform.position = adjustedPos;

        if (!isDownShow)
        {
            rectTransform.localPosition = new Vector3(rectTransform.localPosition.x, rectTransform.localPosition.y + 15, rectTransform.localPosition.z);
        }
        else
        {
            rectTransform.localPosition = new Vector3(rectTransform.localPosition.x, rectTransform.localPosition.y - 15, rectTransform.localPosition.z);
        }

        rectTransform.GetWorldCorners(corners);
        float minX = corners[0].x;
        float maxX = corners[0].x;

        for (int i = 1; i < corners.Length; i++)
        {
            if (corners[i].x < minX) minX = corners[i].x;
            if (corners[i].x > maxX) maxX = corners[i].x;
        }

        //显示arrowImage 的x轴上的位置，和worldPos同步，但不超过minX 和 maxX范围
        if (!isDownShow)
        {
            Vector3 arrowImagePosition = arrowImage.position;
            arrowImagePosition.x = Mathf.Clamp(worldPos.x, minX, maxX);
            arrowImage.position = arrowImagePosition;
        }
        else
        {
            Vector3 arrowUpImagePosition = arrowUpImage.position;
            arrowUpImagePosition.x = Mathf.Clamp(worldPos.x, minX, maxX);
            arrowUpImage.position = arrowUpImagePosition;
        }

    }
}