include <SpreadsheetImpl.h>
  
  int SpreadsheetImpl::sCounter = 0;
  
  // Microsoft Visual Studio requires you to omit the following two lines.
  // However, some compilers require them.
  //const int SpreadsheetImpl::kMaxHeight;
  //const int SpreadsheetImpl::kMaxWidth;
  
  bool SpreadsheetImpl::inRange(int val, int upper)
  {
    return (val >= 0 && val < upper);
  }
  
  SpreadsheetImpl::SpreadsheetImpl(const SpreadsheetApplication& theApp,
                int inWidth, int inHeight)
    : mWidth(inWidth < kMaxWidth ? inWidth : kMaxWidth),
      mHeight(inHeight < kMaxHeight ? inHeight : kMaxHeight), mTheApp(theApp)
  {
    mId = sCounter++;
    mCells = new SpreadsheetCell* [mWidth];
    for (int i = 0; i < mWidth; i++) {
      mCells[i] = new SpreadsheetCell[mHeight];
    }
  }
  
  void SpreadsheetImpl::setCellAt(int x, int y, const SpreadsheetCell& cell)
  {
    if (!inRange(x, mWidth) || !inRange(y, mHeight)) {
      return;
    }
  
    mCells[x][y] = cell;
  }
  
  SpreadsheetCell SpreadsheetImpl::getCellAt(int x, int y)
  {
    SpreadsheetCell empty;
  
    if (!inRange(x, mWidth) || !inRange(y, mHeight)) {
      return (empty);
    }
    return (mCells[x][y]);
  }
  
  SpreadsheetImpl::~SpreadsheetImpl()
  {
    for (int i = 0; i < mWidth; i++) {
      delete [] mCells[i];
    }
  
    delete [] mCells;
  }
  
  void SpreadsheetImpl::copyFrom(const SpreadsheetImpl& src)
  {
    int i, j;
  
    mWidth = src.mWidth;
    mHeight = src.mHeight;
  
    mCells = new SpreadsheetCell* [mWidth];
    for (i = 0; i < mWidth; i++) {
      mCells[i] = new SpreadsheetCell[mHeight];
    }
  
    for (i = 0; i < mWidth; i++) {
      for (j = 0; j < mHeight; j++) {
        mCells[i][j] = src.mCells[i][j];
      }
    }
  }
  
  SpreadsheetImpl::SpreadsheetImpl(const SpreadsheetImpl& src) :
    mTheApp(src.mTheApp)
  {
    mId = sCounter++;
    copyFrom(src);
  }
  
  SpreadsheetImpl& SpreadsheetImpl::operator=(const SpreadsheetImpl& rhs)
  {
    int i;
  
    // check for self-assignment
    if (this == &rhs) {
      return (*this);
    }
    // free the old memory
    for (i = 0; i < mWidth; i++) {
      delete [] mCells[i];
    }
  
    delete [] mCells;
  
    // copy the new memory
    copyFrom(rhs);
  
    return (*this);
  }
  
  int SpreadsheetImpl::getId()
  {
    return (mId);
  }