using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

[Serializable]
public class ToolEraser
{
  [HideInInspector]
  public Vector3 cursorPos;
  [HideInInspector]
  public List<int> selected = new List<int>();

  public void Reset()
  {
    // for resetting the tool (when swapping around, initializing, etc)
    selected.Clear();
  }

  public void Frame(Input input, Pixelgon pixelgon)
  {
    Vector3 rawCursorPos = cursorPos = input.dragCursor;

    if (input.mainCon.trigger.held)
    {
      selected.Clear();
      int length = 0;
      for (int i = 0; i < pixelgon.vectors.Count; i++)
      {
        if (pixelgon.vectors[i] == Vector3.zero)
        {
          length = 0;
        }
        else
        {
          if (length > 0)
          {
            Vector3 edgeSnapPos = StaticMethods.EdgeSnap(pixelgon.vectors[i - 1], pixelgon.vectors[i], rawCursorPos);
            if (Vector3.Distance(rawCursorPos, edgeSnapPos) < 0.015f)
            {
              cursorPos = edgeSnapPos;
              if (cursorPos == pixelgon.vectors[i - 1])
              {
                selected.Add(i - 1);
                break;
              }
              if (cursorPos == pixelgon.vectors[i])
              {
                selected.Add(i);
                break;
              }
              
              selected.Add(i - 1);
              selected.Add(i);

              break;
            }
          }

          length++;
        }
      }
    }

    if (selected.Count > 0 && input.mainCon.one.down)
    {
      if (selected.Count == 1)
      {
        pixelgon.vectors.RemoveAt(selected[0]);
      }
      else
      {
        pixelgon.vectors.Insert(selected[1], Vector3.zero);
      }

      pixelgon.vectors = StaticMethods.DeleteLoose(pixelgon.vectors);
      Reset();
    }
  }
}