using System;
using System.Collections;
using System.IO;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using OpenGL4NET;

namespace Semestralka
{
    class LoadObjectOBJ
    {
        private int countOfObjects;
        private int countOfVertex;
        private int countOfFaces;
        private ArrayList obj;

        public ArrayList loadObjectOBJ(string fileName){
            if (!File.Exists(fileName))
            {
                Console.WriteLine("{0} neexistuje!", fileName);
                return null;
            }
            countOfObjects = 0;
            countOfVertex = 0;
            countOfFaces = 0;
            obj = new ArrayList();

            FileStream fStream = new FileStream(fileName, FileMode.Open,
            FileAccess.Read, FileShare.Read);
            StreamReader sr = new StreamReader(fStream, Encoding.UTF8, true);

            while (sr.Peek() > -1)
            {
                string input = sr.ReadLine();
                if (input.StartsWith("o"))
                {
                    obj.Add(new Object(input.Split(' ')[1]));
                    countOfObjects++;
                }
                if(input.StartsWith("v")){
                    ((Object) obj[countOfObjects-1]).addedVertex();
                    countOfVertex++;
                }
                if (input.StartsWith("f"))
                {
                    ((Object)obj[countOfObjects - 1]).addedFace();
                    countOfFaces++;
                    if (input.Split(' ').Length == 5)
                    {
                        ((Object)obj[countOfObjects - 1]).addedFace();
                        countOfFaces++;
                    }
                }
            }
            sr.Close();

            Console.WriteLine("count of objects = " + countOfObjects);
            Console.WriteLine("count of vertex = " + countOfVertex);
            Console.WriteLine("count of faces = " + countOfFaces);

            for (int i = 0; i < obj.Count; i++)
            {
                Console.WriteLine(i);
                ((Object)obj[i]).objectInfo();
                ((Object)obj[i]).createVertexField();
                ((Object)obj[i]).createIndexFiels();
            }

            fStream = new FileStream(fileName, FileMode.Open,
            FileAccess.Read, FileShare.Read);
            sr = new StreamReader(fStream, Encoding.UTF8, true);
            countOfObjects = 0;
            countOfVertex = 0;
            int index = 0;

            while (sr.Peek() > -1)
            {
                string input = sr.ReadLine();
                if (input.StartsWith("o"))
                {
                    countOfObjects++;
                    index = countOfVertex;
                    Console.WriteLine("index = "+index);
                }
                if (input.StartsWith("v"))
                {
                    countOfVertex++;

                    string[] strField = input.Replace('.',',').Split(' ');

                    ((Object)obj[countOfObjects - 1]).addVertex((float)System.Convert.ToDouble(strField[1]), (float)System.Convert.ToDouble(strField[2]), (float)System.Convert.ToDouble(strField[3]));
                }
                if (input.StartsWith("f"))
                {
                    string[] strField = input.Split(' ');

                    ((Object)obj[countOfObjects - 1]).addFace((uint)(uint.Parse(strField[1]) - index), (uint)(uint.Parse(strField[2]) - index), (uint)(uint.Parse(strField[3]) - index));

                    if (strField.Length == 5)
                    {
                        ((Object)obj[countOfObjects - 1]).addFace((uint)(uint.Parse(strField[1]) - index), (uint)(uint.Parse(strField[3]) - index), (uint)(uint.Parse(strField[4]) - index));
                    }
                }
            }
            sr.Close();

            for (int i = 0; i < obj.Count; i++)
            {
                Console.WriteLine("creating buffers " + i);
                ((Object)obj[i]).objectInfo();
                ((Object)obj[i]).createBuffers();
            }

            return obj;
        }
    }
}