include <ArticleCitations.h>
  include <iostream>
  include <fstream>
  include <string>
  include <stdexcept>
  using namespace std;
  
  ArticleCitations::ArticleCitations(const string& fileName)
  {
    // All we have to do is read the file
    readFile(fileName);
  }
  
  ArticleCitations::ArticleCitations(const ArticleCitations& src)
  {
    // Copy the article name, author, etc.
    mArticle = src.mArticle;
    // Copy the number of citations
    mNumCitations = src.mNumCitations;
    // Allocate an array of the correct size
    mCitations = new string[mNumCitations];
    // Copy each element of the array
    for (int i = 0; i < mNumCitations; i++) {
      mCitations[i] = src.mCitations[i];
    }
  }
  
  ArticleCitations& ArticleCitations::operator=(const ArticleCitations& rhs)
  {
    // Check for self-assignment
    if (this == &rhs) {
      return (*this);
    }
    // Free the old memory
    delete [] mCitations;
    // Copy the article name, author, etc.
    mArticle = rhs.mArticle;
    // Copy the number of citatoins
    mNumCitations = rhs.mNumCitations;
    // Allocate a new array of the correct size
    mCitations = new string[mNumCitations];
    // Copy each citation
    for (int i = 0; i < mNumCitations; i++) {
      mCitations[i] = rhs.mCitations[i];
    }
    return (*this);
  }
  
  ArticleCitations::~ArticleCitations()
  {
    delete [] mCitations;
  }
  
  void ArticleCitations::readFile(const string& fileName)
  {
    // open the file and check for failure
    ifstream istr(fileName.c_str());
    if (istr.fail()) {
      throw invalid_argument("Unable to open file\n");
    }
    // read the article author, title, etc. line.
    getline(istr, mArticle);
  
    // skip the whitespace before the citations start
    istr >> ws;
  
    int count = 0;
    // save the current position so we can return to it
    int citationsStart = istr.tellg();
    // First count the number of citations
    while (!istr.eof()) {
      string temp;
      getline(istr, temp);
      // skip whitespace before the next entry
      istr >> ws;
      count++;
    }
  
    if (count != 0) {
      // allocate an array of strings to store the citations
      mCitations = new string[count];
      mNumCitations = count;
      // seek back to the start of the citations
      istr.seekg(citationsStart);
      // read each citation and store it in the new array
      for (count = 0; count < mNumCitations; count++) {
        string temp;
        getline(istr, temp);
        mCitations[count] = temp;
      }
    }
  }