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/*
//  nlRandom.cpp
//
//  Created by Daisuke Nogami on 9/30/05.
//  Copyright 2005 Daisuke Nogami [null-null.net]. Some rights reserved.
*/
 
#include "stdafx.h"
 
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
 
// http
#include <windows.h>
#include <wininet.h>
 
// selfmade class
#include "nlRandom.h"
 
// random.org param
#define GEN_RAND_INTS 10000
#define SMALLEST_VALUE -1000000000
#define LARGEST_VALUE 1000000000
#define COLUMNS 1
 
nlRandom::nlRandom(){
  int i;
 
  // initialize random source
 
  std::srand( time( NULL ) );
 
  randsrc = new int[GEN_RAND_INTS];
  for( i = 0; i < GEN_RAND_INTS; i++ ){
    randsrc[i] = -1000000001;  /* SMALLEST_VALUE -1 */
  }
  counter = 0;
}
 
nlRandom::~nlRandom(){
  delete []this->randsrc;
  this->randsrc = 0;
}
 
// [0-1]
double nlRandom::rand(){
  int res = randsrc[counter];
  int randmax;
 
  if( res == -1000000001 /* SMALLEST_VALUE -1 */ ){
    res = std::rand();
    randmax = RAND_MAX;
  }
  else{
    res = randsrc[counter]-(SMALLEST_VALUE);
    randmax = LARGEST_VALUE-SMALLEST_VALUE;
  }
 
  counter++;
  if( counter >= GEN_RAND_INTS ){
    counter = 0;
  }
 
  return (double)res/(double)randmax;
}
 
void nlRandom::load(){
  HINTERNET hInet;
  HINTERNET hFile;
  DWORD dwSize;
  char* lpszBuf = (LPTSTR)GlobalAlloc( GPTR, 1024 );
  std::string buff;
  int i, idx;
 
  char url[256];
  sprintf(
    url,
    "%s%d%s%d%s%d%s%d",
    "http://www.random.org/cgi-bin/randnum?num=",
    GEN_RAND_INTS,
    "&min=",
    SMALLEST_VALUE,
    "&max=",
    LARGEST_VALUE,
    "&col=",
    COLUMNS
  );
 
  // open url
  hInet = InternetOpen(
    "random.org",
    INTERNET_OPEN_TYPE_DIRECT,
    NULL,
    NULL,
    0
  );
 
  hFile = InternetOpenUrl(
    hInet,
    url,
    NULL,
    0,
    INTERNET_FLAG_RELOAD,
    0
  );
  
  // get from random.org
  while( true ){
    dwSize = 0;
    memset( lpszBuf, 0x00, sizeof( lpszBuf ) );
    if( !InternetReadFile( hFile, lpszBuf, sizeof(lpszBuf)-1, &dwSize ) ){
      break;
    }
 
    buff += std::string(lpszBuf);
 
    if( dwSize == 0){
      break;
    }
  }
  
  // convert to int from string
  i = idx = 0;
  while( (idx = buff.find('\n')) != std::string::npos && i < GEN_RAND_INTS ){
    randsrc[i] = atoi( buff.substr( 0, idx ).c_str() );
    buff = buff.substr( idx+1, buff.length() );
    i++;
  }
 
  // close url
  InternetCloseHandle(hFile);
  InternetCloseHandle(hInet);
}