using UnityEngine;

[RequireComponent(typeof(LineRenderer))]
public class DrawDistanceLine : MonoBehaviour
{
    private float radiusX;
    private float radiusZ;

    private float startAngle;
    private float endAngle;

    [Header("Якість дуги")]
    public int segments = 50;

    [Header("Центр дуги")]
    private Vector3 center;

    [Header("Інформація (тільки для читання)")]
    [SerializeField] private float arcLength = 0f;

    private LineRenderer lineRenderer;

    void Start()
    {
        radiusX = GetComponent<RunlinePlacer>().radiusX;
        radiusZ = GetComponent<RunlinePlacer>().radiusZ;
        center = GetComponent<RunlinePlacer>().center;

        lineRenderer = GetComponent<LineRenderer>();

        lineRenderer.startColor = new Color(1f, 1f, 1f); 
        lineRenderer.endColor = new Color(1f, 1f, 1f);
        lineRenderer.startWidth = 1f;
        lineRenderer.endWidth = 1f;
        lineRenderer.useWorldSpace = true;
        lineRenderer.material = new Material(Shader.Find("Sprites/Default"));
    }

    public void DrawDistanceArc()
    {
        
        startAngle = GetComponent<RunlinePlacer>().GetStartLineAngle();
        endAngle = GetComponent<RunlinePlacer>().GetEndLineAngle();

        if (startAngle > endAngle) endAngle += 2 * Mathf.PI;

        lineRenderer.positionCount = segments + 1;
        float angleStep = (endAngle - startAngle) / segments;

        Vector3 prevPos = Vector3.zero;
        arcLength = 0f;

        for (int i = 0; i <= segments; i++)
        {
            float angle = startAngle + i * angleStep;
            float x = Mathf.Cos(angle) * radiusX;
            float z = Mathf.Sin(angle) * radiusZ;
            lineRenderer.SetPosition(i, new Vector3(x, 0f, z));
            Vector3 pos = new Vector3(x, 0f, z) + center;

            if (i > 0)
                arcLength += Vector3.Distance(pos, prevPos);

            prevPos = pos;
        }
        
        GameObject startLine = GetComponent<RunlinePlacer>().GetStartLineGameObject();
        startLine.GetComponent<LineData>().SetDistanceText((int)arcLength);
        ClearArc();
    }
    public void ClearArc()
    {
        if (lineRenderer != null)
        {
            lineRenderer.positionCount = 0;
            arcLength = 0f;
        }
    }
}