// tsncom18.cc
// Nick Macks (macks@fnal.gov), Summer 2002

// CovMatrices: CovMatrixX determinant calculation

#include "CovMatrices/CovMatrix5.h"
#include "CovMatrices/CovMatrix6.h"

using namespace std;

using CovMatrices::CovMatrix5;
using CovMatrices::CovMatrix6;

// Function declarations
void Identification();
void GetDimension();
void Describe(const int&);
void BuildMatrix(CovMatrix5&, CovMatrix6&, const int&);
void Show(const CovMatrix5&, const CovMatrix6&, const int&);
void GetCalcs(int&);
void GetRuns(int&);
void Calculate(CovMatrix5&, CovMatrix6&, const int&, const int&, const int&);


// Package ID
void Identification()
{
  cout << "Using CovMatrices\n";
}

// Ask for the desired dimension
void GetDimension(int& dimension)
{
  cout << "Enter the desired dimension(5-6): ";
  cin >> dimension;

  while ( (dimension < 5) || (dimension > 6) )
  {
    cout << "Enter 5 or 6: ";
    cin >> dimension;
  }
}

// Describe how the matrix was defined
void Describe(const int& dimension)
{
    cout << "Matrix was defined 'CovMatrix" << dimension << "'\n";
}

// Build the matrix
void BuildMatrix(CovMatrix5& matrix5, CovMatrix6& matrix6, const int& dimension)
{
  if (dimension == 5)
  {
    for (int i=0; i<dimension; ++i)
    {
      for (int j=0; j<dimension; ++j)
      {
        if (i == j)
          matrix5(i,j) = 1000 + i*100;
        else if (i > j)
          matrix5(i,j) = 2 + i*2 + j*(dimension*2);
      }
    }
  }
  else if (dimension == 6)
  {
    for (int i=0; i<dimension; ++i)
    {
      for (int j=0; j<dimension; ++j)
      {
        if (i == j)
          matrix6(i,j) = 1000 + i*100;
        else if (i > j)
          matrix6(i,j) = 2 + i*2 + j*(dimension*2);
      }
    }
  }
}

// Show the matrix
void Show(const CovMatrix5& matrix5, const CovMatrix6& matrix6,
          const int& dimension)
{
  if (dimension == 5)
    cout << "Using matrix =\n" << matrix5 << "\n";
  else if (dimension == 6)
    cout << "Using matrix =\n" << matrix6 << "\n";
}

// Get the number of times to calculate the determinant
void GetCalcs(int& N)
{
  cout << "How many determinant calculations? ";
  cin >> N;
}

// Get the number of runs
void GetRuns(int& run)
{
  cout << "How many runs? ";
  cin >> run;
  cout << "\n";
}

// Calculate the determinant of the matrix
void Determinant(CovMatrix5& matrix5, CovMatrix6& matrix6,
                 const int& dimension, const int& N, const int& runs)
{
  // Define two doubles to hold the value of the determinant
  double determinant5 = 0.;
  double determinant6 = 0.;

  // Define a counter
  int counter = 0;

  if (dimension == 5)
  {
    // Loop "run" times
    for (int r=0; r<runs; ++r)
    {
      // Do the calculations
      for (int i=0; i<N; ++i)
      {
        determinant5 = matrix5.determinant();
        ++counter;
      }

      // Write the output
      cout << counter << " determinant calculations took place\n";
      cout << "Determinant = " << determinant5 << "\n";

      // Reset the counter
      counter = 0;
    }
  }
  else if(dimension == 6)
  {
    // Loop "run" times
    for (int r=0; r<runs; ++r)
    {
     // Do the calculations
      for (int i=0; i<N; ++i)
      {
        determinant6 = matrix6.determinant();
        ++counter;
      }

      // Write the output
      cout << counter << " determinant calculations took place\n";
      cout << "Determinant = " << determinant6 << "\n";
 
      // Reset the counter
      counter = 0;
    }  
  }
}


int main()
{
  // What package are we using?
  Identification();

  // Get the dim(-ension)
  int dim = 0; GetDimension(dim);

  // Define two "dim x dim" CovMatrices
  CovMatrix5 m5;
  CovMatrix6 m6;

  // Describe how the matrix was defined
  Describe (dim);

  // Build the "dim x dim" matrix
  BuildMatrix(m5, m6, dim);

  // Show the actual matrix
  Show(m5, m6, dim);

  // Calculation parameters
  int tim = 0; GetCalcs(tim); // number of calculations
  int run = 0; GetRuns(run);  // number of runs

  // Calculate the determinant
  Determinant(m5, m6, dim, tim, run);

  return 0;
}