/*
 * Mike Slemmer
 * CS326A - Project
 * main.cc
 *
 * This is the main file which creates all the requisite objects and 
 * implements the path planner.
 */

#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include "global.h"

#define DEBUG_LEVEL 5

ErrorHandler *err;

/* Main
 * 
 * The main here makes sure that a filename was given as input.
 */

main(int argc, char **argv) {

  char *filename;
  char *output_filename;
  Trifixion *planner;
  struct stat buf;
  FILE *input, *output;

  err = new ErrorHandler(DEBUG_LEVEL);

  if (argc < 2) {
    filename = argv[1];
  } else {
    filename = NULL;
  }

  if (filename) {
    if (stat(filename, &buf) < 0) {
      fprintf(stderr, "Input File %s does not exist or is inaccessible.\n",
	      filename);
      exit(1);
    }
  }

  if (argc > 2) 
    output_filename = argv[2];
  else
    output_filename = NULL;

  if (output_filename) {
    if(stat(output_filename, &buf) >= 0) {
      fprintf(stderr, "Output File %s exists.\n", output_filename);
      exit(1);
    }
  }

  planner = new Trifixion();

  if (filename) {
    input = fopen(filename, "r");
    if (!input) {
      fprintf(stderr, "Error opening input file %s\n", filename);
      exit(1);
    }
  } else {
    input = stdin;
  }

  if (output_filename) {
    output = fopen(output_filename, "w");
    if (!output) {
      fprintf(stderr, "Error opening output file %s\n", output_filename);
      fclose(input);
      exit(1);
    }
  } else output = stdout;

  planner->Start(input, output); 
  
  fclose(input);
  if (output != stdout)
    fclose(output);

}