using UnityEngine;
using Shapes;

namespace AibisDream.MiniGame.HuoShan
{
    [ExecuteAlways]
    public class ScreenTopLine : ImmediateModeShapeDrawer
    {
        [Header("Line Settings")]
        [Tooltip("Reference to the screen transform")]
        [SerializeField] private Transform screenTransform;

        [SerializeField] private Color lineColor = Color.cyan;
        [SerializeField] private float thickness = 0.05f;
        [SerializeField] private ThicknessSpace thicknessSpace = ThicknessSpace.Meters;
        [SerializeField] private float yOffset = 0f;

        public override void DrawShapes(Camera cam)
        {
            if (screenTransform == null) return;

            using (Draw.Command(cam))
            {
                Draw.ResetAllDrawStates();
                Draw.BlendMode = ShapesBlendMode.Transparent;
                Draw.LineGeometry = LineGeometry.Flat2D;
                Draw.ThicknessSpace = thicknessSpace;
                Draw.Thickness = thickness;

                Vector3 pos = screenTransform.position;
                Vector3 scale = screenTransform.lossyScale;

                float halfWidth = scale.x / 2f;
                float halfHeight = scale.y / 2f;

                float topY = pos.y + halfHeight + yOffset;
                Vector3 start = new Vector3(pos.x - halfWidth, topY, pos.z);
                Vector3 end = new Vector3(pos.x + halfWidth, topY, pos.z);

                Draw.Line(start, end, lineColor);
            }
        }
    }
}