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

public enum Scene { AssetSpace, Pixelgon, StretchSilo }
public class Monolith : MonoBehaviour
{
  public Input input; // INPUT
  public Pixelgon pixelgon; // DATA
  public AssetSpace assetSpace;

  [Button] public void Save() { assetSpace.Save(pixelgon); }
  [Button] public void Load() { pixelgon = assetSpace.Load(); }

  // Tools/Systems
  public ToolNewVector toolNewVector;
  public ToolEditVector toolEditVector;

  public ToolNewQuad toolNewQuad;
  // public ToolEditQuad toolEditQuad;

  public ToolEraser toolEraser;

  // stretch-silo
  public StretchSilo stretchSilo;

  public Render render; // VIEW

  void Start()
  {
    assetSpace.Init(render.polyVector);
  }

  public Scene scene;
  int toolIndex = 0;
  void Update()
  {
    input.Frame();

    switch (scene)
    {
      case Scene.AssetSpace:
        assetSpace.Frame(input, render);
        break;

      case Scene.Pixelgon:
        // toolNewQuad.Frame(input, pixelgon);
        // render.ToolNewQuad(toolNewQuad);
        if (input.offCon.two.down)
        {
          toolNewVector.Reset();
          toolEditVector.Reset();

          toolNewQuad.Reset();

          toolEraser.Reset();

          if (toolIndex < 3)
          {
            toolIndex++;
          }
          else
          {
            toolIndex = 0;
          }
        }

        switch (toolIndex)
        {
          case 0:
            toolNewVector.Frame(input, pixelgon);
            render.ToolNewVector(toolNewVector);
            break;
          case 1:
            toolEditVector.Frame(input, pixelgon);
            render.ToolEditVector(toolEditVector);
            break;
          case 2:
            toolNewQuad.Frame(input, pixelgon);
            render.ToolNewQuad(toolNewQuad, pixelgon);
            break;
          case 3:
            toolEraser.Frame(input, pixelgon);
            render.ToolEraser(toolEraser);
            break;
        }

        render.Pixelgon(pixelgon);
        break;

      case Scene.StretchSilo:
        render.StretchSilo(stretchSilo, assetSpace);
        break;
    }

    render.Frame(input);
  }
}

public static class StaticMethods
{
  public static List<Vector3> DeleteLoose(List<Vector3> vectors)
  {
    int length = 0;
    for (int i = vectors.Count - 1; i >= 0; i--)
    {
      if (vectors[i] != Vector3.zero)
      {
        length++;
      }
      else
      {
        if (length == 1)
        {
          vectors.RemoveAt(i + 1);
        }

        length = 0;
      }
    }

    return vectors;
  }

  public static bool Inside(float from, float to, float x)
  {
    if (from < to)
    {
      return x > from && x < to;
    }
    else
    {
      return x > to && x < from;
    }
  }

  static Vector3[] snappingDir = new Vector3[] { Vector3.right, Vector3.up, Vector3.forward };
  public static Vector3 DirSnap(Vector3 a, Vector3 c)
  {
    for (int i = 0; i < snappingDir.Length; i++)
    {
      for (int j = 0; j < 2; j++)
      {
        Vector3 snapDir = snappingDir[i];
        if (j == 1)
        {
          snapDir = snappingDir[i] * -1f; // right -> left etc.
        }

        Vector3 dir = (c - a).normalized;
        if (Vector3.Angle(snapDir, dir) < 8f) // dir snapping margin
        {
          return a + snapDir * Vector3.Distance(a, c);
        }
      }
    }

    return c;
  }

  public static Vector3 EdgeSnap(Vector3 a, Vector3 b, Vector3 c)
  {
    Quaternion perspective = Quaternion.LookRotation(b - a);
    Vector3 pA = Quaternion.Inverse(perspective) * a;
    Vector3 pB = Quaternion.Inverse(perspective) * b;
    Vector3 pC = Quaternion.Inverse(perspective) * c;

    // XY
    float dist = Vector2.Distance(pC, pA); // pA & pB interchangeable

    // Z
    if (pC.z < pA.z || pC.z > pB.z) // outside
    {
      dist += Mathf.Min(Mathf.Abs(pC.z - pA.z), Mathf.Abs(pC.z - pB.z));
    }

    // snapping margin, where is this variable?
    // idk becuase this snapping system will be reused in tools and quads
    // scalable 0-1 * design (0 == no snapping) set parameter in ORIEL UI

    pC.x = pA.x;
    pC.y = pA.y;

    pC.z = Mathf.Clamp(pC.z, pA.z, pB.z);

    return perspective * pC;

    // min distance to handle 2+ conflicting snaps ?
  }

  public static Vector3 Snap(List<List<Vector3>> lists, Vector3 cursorPos)
  {
    Vector3 closestJoint = Vector3.one * 1000;
    Vector3 closestEdge = Vector3.one * 1000;
    Vector3 closestMirrorJoint = Vector3.one * 1000;

    for (int l = 0; l < lists.Count; l++)
    {
      int length = 0;
      for (int i = 0; i < lists[l].Count; i++)
      {
        if (lists[l][i] == Vector3.zero)
        {
          length = 0;
          continue;
        }

        if (Vector3.Distance(cursorPos, lists[l][i]) < Vector3.Distance(cursorPos, closestJoint))
        {
          closestJoint = lists[l][i];
        }

        if (length > 0)
        {
          Vector3 edgeSnapPos = StaticMethods.EdgeSnap(lists[l][i - 1], lists[l][i], cursorPos);
          if (Vector3.Distance(cursorPos, edgeSnapPos) < Vector3.Distance(cursorPos, closestEdge))
          {
            closestEdge = edgeSnapPos;
          }
        }

        Vector3 xMirrorJoint = lists[l][i];
        xMirrorJoint.x *= -1;
        if (Vector3.Distance(cursorPos, xMirrorJoint) < Vector3.Distance(cursorPos, closestMirrorJoint))
        {
          closestMirrorJoint = xMirrorJoint;
        }

        Vector3 yMirrorJoint = lists[l][i];
        yMirrorJoint.y *= -1;
        if (Vector3.Distance(cursorPos, yMirrorJoint) < Vector3.Distance(cursorPos, closestMirrorJoint))
        {
          closestMirrorJoint = yMirrorJoint;
        }

        Vector3 zMirrorJoint = lists[l][i];
        zMirrorJoint.z *= -1;
        if (Vector3.Distance(cursorPos, zMirrorJoint) < Vector3.Distance(cursorPos, closestMirrorJoint))
        {
          closestMirrorJoint = zMirrorJoint;
        }

        length++;
      }
    }

    Vector3 xMiddleJoint = cursorPos;
    xMiddleJoint.x = 0;
    if (Vector3.Distance(cursorPos, xMiddleJoint) < Vector3.Distance(cursorPos, closestMirrorJoint))
    {
      closestMirrorJoint = xMiddleJoint;
    }

    Vector3 snapPos = cursorPos;
    if (Vector3.Distance(cursorPos, closestJoint) < 0.015f) // snap dist
    {
      snapPos = closestJoint;
    }
    else if (Vector3.Distance(cursorPos, closestEdge) < 0.015f)
    {
      snapPos = closestEdge;
    }
    else if (Vector3.Distance(cursorPos, closestMirrorJoint) < 0.015f)
    {
      snapPos = closestMirrorJoint;
    }
    // else if (vector.Count > 1) //weird
    // {
    //   snapPos = StaticMethods.DirSnap(vector[vector.Count - 2], cursorPos);
    // }

    return snapPos;
  }
}