/** wordsInFile.cpp
  * Separate a file into tokens, and store them individually in an array of string
  * Print them and output the number of words in the file
  *
  * The array used to store the words is partially-filled
  */

#include <iostream>
#include <fstream>
#include <iomanip>
#include <string>

using namespace std;

/**
  * Interactively obtain the name of a file to open from the user
  * Paramater:
  *	source: EXPORT - must be reference
  * Returns: If true, source is a handle for a file to read
  *          If false, source is a zero-valued stream, i.e. not open
  */
bool openForRead(ifstream &source);

/**
  * Read the content one token at a time 
  *   from the file represented by parameter source, placing the words
  *   into the parameter array words. 
  * Parameter count will hold the number of words in array words.
  * Parameters:
  *	source: IMPORT/EXPORT
  *	words : EXPORT
  *	count : EXPORT
  */
void getWords(ifstream &source,string words[],int &count);

/**
  * Print the tokens held in the array 
  * Parameters:
  *	words : IMPORT
  *	count : IMPORT
  */
void printWords(string words[],int count);  // why no & on the int or array?

int const MAXWORDS=1000;

int main()
{ string wordList[MAXWORDS];
  int numWords;
  ifstream source;
  if (!openForRead(source)) {
	 cout << "Open Failed..Check the Data File Name\n";
	 return(-1);
  }
  getWords(source, wordList, numWords);
  printWords(wordList, numWords);
  return(0);
}

// Open a file for reading. If file not opened, return false, else return true
bool openForRead(ifstream &source)
{ string fileName;
  cout << "Enter File to Read >";
  cin >> fileName;
  source.open(fileName.c_str());
  if (source.fail()) 
	 return(false);
  return(true);
}

// Input a file, separating out each token. Limit is 1000 tokens
void getWords(ifstream &source,string words[],int &count)
{ string Token;
  count=0;
  while (!source.eof() && count<MAXWORDS) {
	 source >> Token;
 	 words[count++]=Token;
  }
  source.close();
}

bool openForWrite(ofstream & dest)
{ string fileName;
  cout << "Enter Filename for Output >";
  cin >> fileName;
  dest.open(fileName.c_str());
  if (!dest) {
	cout << "Attempt to Open " << fileName << " Failed\n";
	dest.close();
	return(false);
  }
  return(true);
} 

// Output all the words
void printWords(string words[],int count)
{ ofstream dest;
  bool ok;
  do {
	 ok=openForWrite(dest);
	 if (!ok)
		 cout << " Destination file couldn't be opened. Try again\n";
  } while (!ok);
  if (count)
	  dest << "Words that Appeared in the File\n";
  for (int i=0; i<count; i++)
	dest << setw(3) << i << ":" << words[i] << endl;
  dest.close();
}