#include "FileReader.h"
#include "Renderer.h"

#include <iostream>
#include <fstream>

//Initialize the FileReader instance
FileReader FileReader::m_instance;

void FileReader::readFile(char* fileName) {
    char input[81], *inputPtr;  //temp string space
    std::fstream fs;            //File Stream
    int numTris, numPts;        //Number of objects

    //Open file
    fs.open(fileName, std::fstream::in);

    if (!fs.is_open()) {
        std::cout << "The file failed to open.\n";
        exit(-1);
    }

    //Get the # of vertices and # of triangles
    fs.getline(input,81);
    
    //Number of Triangles
    numTris = strtol(input,&inputPtr,0);
    //Renderer::getInstance()->triangles->reserve(numTris);

    //Number of points
    numPts = strtol(inputPtr,NULL,0);
    //Renderer::getInstance()->points->reserve(numPts);

    //skip over the first newline
    fs.getline(input,81);

    //Read all triangles
    for (int i = 0; i < numTris; i++) {
        readTriangle(&fs, i);
    }

    //skip over the second newline
    fs.getline(input,81);

    //Read all Points
    for (int i = 0; i < numPts; i++) {
        readPoint(&fs, i);
    }

}

void FileReader::readTriangle(std::fstream *fs, int index) {
    char input[81], *inputPtr;  //temp string space
    Triangle t;

    //Read next line
    fs->getline(input,81);

    t.a1 = strtol(input,&inputPtr,0);
    t.a2 = strtol(inputPtr,&inputPtr,0);
    t.a3 = strtol(inputPtr,NULL,0);

    t.normal.i = t.normal.j = t.normal.k = 0;

    Renderer::getInstance()->triangles->push_back(t);
}

void FileReader::readPoint(std::fstream *fs, int index) {
    char input[81], *inputPtr;  //temp string space
    Point p;

    //Read next line
    fs->getline(input,81);

    p.x = (float)strtod(input,&inputPtr);
    p.y = (float)strtod(inputPtr,&inputPtr);
    p.z = (float)strtod(inputPtr,NULL);

    Renderer::getInstance()->points->push_back(p);
}