using Fusion;
using UnityEngine;
using System.Collections.Generic;
using BNG;

public class MarkerEraser : NetworkBehaviour
{
    public float EraseRadius = 0.1f; // شعاع پاک کردن خطوط
    public Transform EraserTransform; // ترانسفورم تخته پاک کن
    public List<LineRenderer> allLines = new List<LineRenderer>();
    public static MarkerEraser instance;

    private void Update()
    {
        isDrawing = GetComponent<MarkerGrab>().grabed;
        if(isDrawing)
        {
            EraseNearbyLines();
        }
      
    }
    public void Awake()
    {
        instance = this;
        EraserTransform = transform;
    }
    public bool isDrawing = false;
    public void StartDrawing()
    {
        isDrawing = true;
     
    }

    public void StopDrawing()
    {
        isDrawing = false;
    }


    private void EraseNearbyLines()
    {
        for (int lineIndex = allLines.Count - 1; lineIndex >= 0; lineIndex--)
        {
            LineRenderer line = allLines[lineIndex];
            if (line == null) continue;

            List<Vector3> newPositions = new List<Vector3>();
            List<Vector3> segment = new List<Vector3>();
            List<List<Vector3>> segments = new List<List<Vector3>>();
            bool isErasing = false;

            for (int i = 0; i < line.positionCount; i++)
            {
                Vector3 point = line.GetPosition(i);
                if (Vector3.Distance(EraserTransform.position, point) > EraseRadius)
                {
                    if (isErasing)
                    {
                        if (segment.Count > 0)
                        {
                            segments.Add(new List<Vector3>(segment));
                            segment.Clear();
                        }
                        isErasing = false;
                    }
                    segment.Add(point);
                }
                else
                {
                    isErasing = true;
                    if (segment.Count > 0)
                    {
                        segments.Add(new List<Vector3>(segment));
                        segment.Clear();
                    }
                }
            }
            if (segment.Count > 0)
                segments.Add(segment);

            allLines.RemoveAt(lineIndex);
            Destroy(line.gameObject);

            foreach (var seg in segments)
            {
                if (seg.Count > 1)
                {
                    
                    CreateNewLine(seg,line);
                }
            }
        }
    }

    private void CreateNewLine(List<Vector3> points,LineRenderer line)
    {
        GameObject newLineObj = new GameObject("SplitLine");
        LineRenderer newLine = newLineObj.AddComponent<LineRenderer>();
        newLine.positionCount = points.Count;
        newLine.material=line.material;
        newLine.startColor=line.startColor;
        newLine.endColor=line.endColor;
        newLine.SetPositions(points.ToArray());
        newLine.startWidth = 0.02f;
        newLine.endWidth = 0.02f;
        allLines.Add(newLine);
    }

    public void RegisterLine(LineRenderer line)
    {
        if (!allLines.Contains(line))
        {
            allLines.Add(line);
        }
    }
}