// File name: filechk.cpp
// Author: Xiannong Meng
// Course: CS2330
// Date: February 27, 1997
// Assignment: classroom discussion
// Problem statement: This program takes a word from user, checks against
//    a dictionary, if the word is not found in the dictionary, it is
//    inserted into the dictionary in a proper place.

#include <iostream.h>
#include <fstream.h>
#include <stdio.h>
#include <conio.h>      // for getch()

#include "./cstring/cstring.h"


void main(void)
{
   void SearchWord(String w);

   ifstream src("words.txt");    // text file to test spell check

   String word;

   if (src)
   {
       src >> word;
       while (!src.eof())
       {
	 SearchWord(word);
	 src >> word;
       }
   }
   else
     cout << " file open failed \n";

}

// Name : SerachWord
// Intent: search a word in the dictionary
// Pre: a word is given
// Post: the word is found in the dictionary,
//       or, asking if the word needs to be inserted
//       into the dictionary
void SearchWord(String word)
{
   ifstream inF("words");        // original dictionary is "words"
   ofstream outF("words.tmp");   // new dictionary is "words.tmp"
   String compWord;
   int changed = 0;

   inF >> compWord;
   while ((inF) && (compWord < word))
   {
       outF << compWord << endl;
       inF >> compWord;
   }

   if (compWord != word)
   {
      cout << word << " not found in the dictionary. \n";
      cout << " Do you want to insert " << word << " into the dictionary? ";
      int res = getch();    // un-buffered input
      cout << endl;
      if ((char)res == 'y' || (char)res == 'Y')
      {
         cout << " inserting " << word << " into the dictionary ...\n";
	 outF << word << endl;
	 changed = 1;
      }
   }
   
   while (inF)
   {
       outF << compWord << endl;
       inF >> compWord;
   }

  inF.close();
  outF.close();
  // update the old dictionary
  if (changed == 1)
  {
     cout << "do you want to rename the updated dictionary? ";
     int res = getch();
     cout << endl;
     if ((char)res == 'Y' || (char)res == 'y')
     {
	cout << " renaming files ...\n";
	rename("words.tmp","words");
     }
  }
}