using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using Vectrosity;
using UnityEngine.EventSystems;
using UnityEngine.UI;

public class DrawLinePlate : MonoBehaviour
{

    public int segments = 250;
    public bool loop = false;
    public List<Vector2> linePoints;

    public VectorLine Penline;
    public VectorLine Rubber;

    public Material RubberMaterial;

    public Material PenlineMaterial;

    public Material RedMaterial;

    public Material GreenMaterial;

    public Material DlepBlueMaterial;

    public Material BlackMaterial;

    public Material BlueMaterial;

    public Material YellowMaterial;

    public int PenlineWith = 1;

    public int RubberWith = 10;

    public List<GameObject> Record_;

    private int TranWidth;
    private int TranHeight;

    public bool CanDrawing = false;

    // Use this for initialization
    void Start()
    {
        Father = GameObject.Find("Canvas").transform.Find("DrawFather").gameObject;
        CreatLine(); CreatRubber();
        TranWidth = Screen.width;
        TranHeight = Screen.height;
    }
    void Awake()
    {
        if (instance == null)
        {
            instance = this;
        }
        this.gameObject.SetActive(false);
    }
    public static DrawLinePlate instance;
   
    public void HiStart()
    {
        Father = GameObject.Find("Canvas").transform.Find("DrawFather").gameObject;
        CreatLine(); CreatRubber();
    }
    public int i = 0;
    public static bool Tool;
    public Texture MouseTexture_huabi;

    public Texture MouseTexture_xiangpi;

    Texture MouseTxture;

    bool has = false;

    void OnGUI()
    {
        if (Mathf.Abs(Screen.width - TranWidth) > 1 || Mathf.Abs(Screen.height - TranHeight) > 1)
        {
            TranWidth = Screen.width;
            TranHeight = Screen.height;
            has = true;
            if (GameObject.Find("VectorCam"))
            {
                GameObject ob = GameObject.Find("VectorCam").gameObject;
                Destroy(ob);
                has = false;
                 List<GameObject> list = new List<GameObject>();
                foreach (Transform child in Father.transform)
                {
                    Destroy(child.gameObject);
                    Record_.Remove(child.gameObject);
                }
                //for (int i = 1; i < list.Count; i++)
                //{
                //    GameObject game = list[i] as GameObject;
                //    Destroy(game);
                //    Record_.Remove(game);
                //}
            }

          
        }
        if (Tool)
        {
            Vector3 mousePos = Input.mousePosition;
          
            if (EventSystem.current.IsPointerOverGameObject())
            {
                Cursor.visible = true;
            }
            else
            {
                Cursor.visible = false;
                GUI.DrawTexture(new Rect(mousePos.x, Screen.height - mousePos.y, MouseTxture.width, MouseTxture.height), MouseTxture);
            }
        }
    }
    public void GetMaterialColor(int num)
    {
        switch (num)
        {
            case 1: PenlineMaterial = BlackMaterial; break;
            case 2: PenlineMaterial = BlueMaterial; break;
            case 3: PenlineMaterial = DlepBlueMaterial; break;
            case 4: PenlineMaterial = RedMaterial; break;
            case 5: PenlineMaterial = GreenMaterial; break;
            case 6: PenlineMaterial = YellowMaterial; break;
            case 7: MouseTxture = MouseTexture_huabi; Tool = true; break;
            case 8: MouseTxture = MouseTexture_xiangpi; Tool = true; break;
            case 9: MouseTxture=null; Tool = false; break;
        }
    }
    public static bool thekong = true;
    Vector3 mousepoint;
    void Update()
    {
        if (EventSystem.current.IsPointerOverGameObject())
        {
            return;
        }
        if (Input.GetMouseButton(0))
        {
            if (MouseTxture!=null && MouseTxture.name == "eraser")
            {
                if (mousepoint == Input.mousePosition) return;
                mousepoint = Input.mousePosition;
                linePoints.Add(Input.mousePosition);
                RubberDraw();
            }
        }
        if (Input.GetMouseButton(0))
        {
            if (MouseTxture != null && MouseTxture.name == "brus")
            {
               
                    if (mousepoint == Input.mousePosition) return;
                  
                    mousepoint = Input.mousePosition;
                    linePoints.Add(Input.mousePosition);
                    LineDraw();
                
            }
        }
        if (Input.GetMouseButtonUp(0))
        {
            if (MouseTxture != null && MouseTxture.name == "brus")
            {
                CreatLine();
            }
        }
        if (Input.GetMouseButtonUp(0))
        {
            if (MouseTxture != null && MouseTxture.name == "eraser")
            {
                CreatRubber();
            }
        }

    }

    void CreatRubber()
    {
        VectorLine.vectorLayer = 7;
        i++;
        Rubber = new VectorLine("Rubber", new Vector2[segments + 1], RubberMaterial, RubberWith, LineType.Continuous, Joins.Weld);
        Rubber.vectorObject.transform.parent = Father.transform;
        linePoints.Clear();
        Record_.Add(Rubber.vectorObject);
    }
    void RubberDraw()
    {

        Rubber.depth = i;
        if (linePoints.Count < 3) return;
        Rubber.MakeSpline(linePoints.ToArray(), segments, loop);
        Rubber.Draw();


    }
    //public Mesh Mesh_;

    private GameObject Father;

    public Slider slidervalue;
    void CreatLine()
    {
        VectorLine.vectorLayer = 7;
        i++;
        Penline = new VectorLine("Spline", new Vector2[segments + 1], PenlineMaterial, slidervalue.value*10f, LineType.Continuous, Joins.Weld);
        Record_.Add(Penline.vectorObject);
        Penline.vectorObject.transform.parent = Father.transform;
        linePoints.Clear();
     
        
    }
    public void Clear_()
    {
        linePoints.Clear();
    }
    void LineDraw()
    {

        Penline.depth = i;


        if (linePoints.Count < 3) return;
        Penline.MakeSpline(linePoints.ToArray(), segments, loop);
        Penline.material = PenlineMaterial;

        Penline.lineWidth = slidervalue.value*10;
        Penline.Draw();

    }
    private void TangentSolver(Mesh theMesh)
    {
        return;
        int vertexCount = theMesh.vertexCount;
        Vector3[] vertices = theMesh.vertices;
        Vector3[] normals = theMesh.normals;
        Vector2[] texcoords = theMesh.uv;
        int[] triangles = theMesh.triangles;
        int triangleCount = triangles.Length / 3;
        Vector4[] tangents = new Vector4[vertexCount];
        Vector3[] tan1 = new Vector3[vertexCount];
        Vector3[] tan2 = new Vector3[vertexCount];
        int tri = 0;
        for (int i = 0; i < (triangleCount); i++)
        {
            int i1 = triangles[tri];
            int i2 = triangles[tri + 1];
            int i3 = triangles[tri + 2];

            Vector3 v1 = vertices[i1];
            Vector3 v2 = vertices[i2];
            Vector3 v3 = vertices[i3];

            Vector2 w1 = texcoords[i1];
            Vector2 w2 = texcoords[i2];
            Vector2 w3 = texcoords[i3];

            float x1 = v2.x - v1.x;
            float x2 = v3.x - v1.x;
            float y1 = v2.y - v1.y;
            float y2 = v3.y - v1.y;
            float z1 = v2.z - v1.z;
            float z2 = v3.z - v1.z;

            float s1 = w2.x - w1.x;
            float s2 = w3.x - w1.x;
            float t1 = w2.y - w1.y;
            float t2 = w3.y - w1.y;

            float r = 1.0f / (s1 * t2 - s2 * t1);
            Vector3 sdir = new Vector3((t2 * x1 - t1 * x2) * r, (t2 * y1 - t1 * y2) * r, (t2 * z1 - t1 * z2) * r);
            Vector3 tdir = new Vector3((s1 * x2 - s2 * x1) * r, (s1 * y2 - s2 * y1) * r, (s1 * z2 - s2 * z1) * r);

            tan1[i1] += sdir;
            tan1[i2] += sdir;
            tan1[i3] += sdir;

            tan2[i1] += tdir;
            tan2[i2] += tdir;
            tan2[i3] += tdir;

            tri += 3;
        }

        for (int i = 0; i < (vertexCount); i++)
        {
            Vector3 n = normals[i];
            Vector3 t = tan1[i];

            // Gram-Schmidt orthogonalize   
            Vector3.OrthoNormalize(ref n, ref t);

            tangents[i].x = t.x;
            tangents[i].y = t.y;
            tangents[i].z = t.z;

            // Calculate handedness   
            tangents[i].w = (Vector3.Dot(Vector3.Cross(n, t), tan2[i]) < 0.0) ? -1.0f : 1.0f;
        }
        theMesh.tangents = tangents;
    }

}