//     Utility classes for template numerical arrays
//                     R. Ansari, C.Magneville   03/2000

#include "machdefs.h"
#include "utilarr.h"
#include "srandgen.h"

// Classe utilitaires

Sequence::~Sequence()
{
}

//////////////////////////////////////////////////////////
/*!
  \class SOPHYA::RandomSequence
  \ingroup TArray
  Base class to generate a sequence of random values
*/

//! Constructor
/*!
  \param typ : generator type
  \param m : mean parameter of the generator (if needed)
  \param s : sigma parameter of the generator (if needed)
 */
RandomSequence::RandomSequence(int typ, double m, double s)
{
  typ_ = (typ == Flat) ? Flat : Gaussian;
  mean_ = m;
  sig_ = s;
}
RandomSequence::~RandomSequence()
{
}

//! Return random sequence values.
/*!
  \return If typ = Flat : return [-1,+1]*sig + mean
  \return If typ = Gaussian : return gaussian distributed
                          with \b mean mean and sigma \b sig
 */
double RandomSequence::Rand()
{
  if (typ_ == Flat) 
    return(drandpm1()*sig_ + mean_);
  else return(GauRnd(mean_, sig_));
}

MuTyV & RandomSequence::Value(sa_size_t k) const 
{
  if (typ_ == Flat) retv_ = drandpm1()*sig_ + mean_;
  else retv_ = GauRnd(mean_, sig_);
  return retv_;
}


//////////////////////////////////////////////////////////
/*!
  \class SOPHYA::RegularSequence
  \ingroup TArray
  Class to generate a sequence of values
*/

//! Constructor
/*!
  \param start : start value
  \param step : step value
  \param f : pointer to the sequence function (default = NULL, f(x)=x )

  See \ref RegularSequenceOperat "operator()"
 */
RegularSequence::RegularSequence(double start, double step, Arr_DoubleFunctionOfX f)
{
  start_ = start;
  step_ = step;
  myf_ = f;
}

RegularSequence::~RegularSequence()
{
}

//! Get the \b k th value
/*!
  \param k : index of the value
  \anchor RegularSequenceOperat
  
  \return f(start+k*step)

 */

MuTyV & RegularSequence::Value (sa_size_t k) const 
{
  double x = start_+(double)k*step_;
  if (myf_)  x = myf_(x);
  retv_ = x;
  return(retv_);
}

/*!
  \class SOPHYA::EnumeratedSequence
  \ingroup TArray
  Explicitly defined sequence of values. The comma operator has
  been redefined to let an easy definition of sequences.
  
  \code
  // Initializing a sequence 
  EnumeratedSequence es;
  es = 11, 22, 33, 44, 55, 66;
  
  for(int k=0; k<8; k++) 
    cout << " k= " << k << " es(k)= " << es(k) << endl; 

  // Decoding a sequence from a string
  EnumeratedSequence ess;
  int nbad;
  ess.Append("56.5 (1.,-1.) 4 8 16", nbad);
  cout << ess;
  \endcode
*/

//! Default constructor
EnumeratedSequence::EnumeratedSequence()
{
}

//! Copy constructor
EnumeratedSequence::EnumeratedSequence(EnumeratedSequence const & es)
{
  Append(es);
}

EnumeratedSequence::~EnumeratedSequence()
{
}

//! Return the k th value in the sequence (default = 0)
MuTyV & EnumeratedSequence::Value (sa_size_t k) const 
{
  if (k >= vecv_.size())  retv_ = 0;
  else retv_ = vecv_[k];
  return(retv_);
}

//! Appends a new value to the sequence
EnumeratedSequence & EnumeratedSequence::operator , (MuTyV const & v)
{
  vecv_.push_back(v);
  return(*this);
}

//! Initialize the sequence with a single value \b v
EnumeratedSequence & EnumeratedSequence::operator = (MuTyV const & v)
{
  vecv_.clear();
  vecv_.push_back(v);
  return(*this);
}

//! Copy operator
EnumeratedSequence & EnumeratedSequence::operator = (EnumeratedSequence const & seq)
{
  Clear();
  Append(seq);
  return(*this);  
}


//! Prints the list to the output stream \b os
void EnumeratedSequence::Print(ostream& os) const 
{
  os << " EnumeratedSequence::Print() - Size()= " << Size() << endl;
  for(int k=0; k<vecv_.size(); k++) {
    os << vecv_[k];
    if ((k > 0) && (k%10 == 0))  os << endl;
    else os << " " ;
  }
  os << endl;
  return;
}

//! Append the \b seq to the end of the sequence.
/*!
  \return the number of added elements.
*/ 
sa_size_t EnumeratedSequence::Append(EnumeratedSequence const & seq)
{
  for(int k=0; k<seq.vecv_.size(); k++) 
    vecv_.push_back(seq.vecv_[k]);
  return(seq.vecv_.size());
}

//! Decodes the string, appending values to the end of the sequence.
/*!
  \param str : string to be decoded
  \param nbad : number of unmatched quotes or parenthesis
  \return the number of added elements.
*/ 
sa_size_t EnumeratedSequence::Append(string const & str, int& nbad)
{
  nbad = 0;
  sa_size_t n = 0;
  size_t l = str.length();
  if (l < 1) return(0);
  if ((str[0] == '#') || (str[0] == '*')) return(0);
  size_t q = 0;
  size_t p = str.find_first_not_of(" \t");
  if ((str[p] == '+') || (str[p] == '-')) {
    if (p == l-1)  return(0);
    if (!isdigit(str[p+1])) return(0);
  }
  else if (!isdigit(str[p]) && (str[p] != '\'') && (str[p] != '(') ) return(0);

  while(q < l) {
    p = str.find_first_not_of(" \t",q);
    if (p >= l)  break;
    if (str[p] == '\'')    {  // Decodage d'un string
      q = str.find('\'',p+1);
      if (q < l) {
	vecv_.push_back(MuTyV(str.substr(p+1,q-p-1)));
	n++;	q++;
      }
      else nbad++;
    }
    else if (str[p] == '(')    {  // Decodage d'un complex
      q = str.find(')',p);
      if (q < l) {
	q++;
	MuTyV mtv(str.substr(p,q-p));
	complex<r_8> z = mtv.operator complex<r_8>();
	vecv_.push_back(MuTyV(z));
	n++;
      }
      else nbad++;      
    }
    else { 
      q = str.find_first_of(" \t",p);
      if (!isdigit(str[p]) && !(str[p] == '+') && !(str[p] == '-') ) { // une chaine
	continue;
      }
      else {  // C'est un nombre 
	if (str.find('.',p) < q)   { // c'est un flottant
	  r_8 x = atof(str.substr(p,q-p).c_str());
	  vecv_.push_back(MuTyV(x));
	}
	else {   // un entier
	  int_8 l = atol(str.substr(p,q-p).c_str());
	  vecv_.push_back(MuTyV(l));
	}
	n++;
      }
    }
  }
  return (n);
}

//! Decodes the input ASCII stream, creating a sequence of values
/*! \param is : Input ASCII stream
    \param nr : Number of non empty (or comment) lines in stream (return value)
    \param nc : Number of columns (= ntot/nlines) (return value)
    \return Number of decoded elements
*/
sa_size_t EnumeratedSequence::FillFromFile(istream& is, 
					   sa_size_t& nr, sa_size_t& nc)
{
  nr = 0;
  nc = 0;
  sa_size_t n = 0;
  char buff[256];
  string line;
  int nbad, nbadtot, nel;
  nbadtot = nbad = 0;
  while (!is.eof()) {
    is.clear(); 
    is.getline(buff, 256);
    //    cout << " DBG : buff=" << buff << " :state=" << is.rdstate() << endl;
    line += buff;
    if (is.good()) {
      nel = Append(line, nbad);
      //      cout << " Decoding line = " << line << " Nel= " << nel << endl;
      if (nel > 0)  { 
	nr++;  n += nel;
      }
      nbadtot += nbad;
      line = "";
    }
  }
  if (line.length() > 0) {
    nel = Append(line, nbad);
    //    cout << " Decoding Eline = " << line << " Nel= " << nel << endl;
    if (nel > 0)  { 
      nr++;  n += nel;
    }
    nbadtot += nbad;
    line = ""; 
  }
  if (nbadtot > 0) 
    cout << "EnumeratedSequence::FillFromFile()/Warning " << nbadtot 
	 << " bad match (quotes or parenthesis) in stream " << endl;
  nc = n/nr;
  return (n);
}

//////////////////////////////////////////////////////////
/*!
  \class SOPHYA::Range
  \ingroup TArray
  Class to define a range of indexes
*/

//! Constructor
/*!
  Define a range of indexes
  \param start : start index (inclusive)
  \param end : end index (inclusive)
  \param size : size (number of elements, used if end \<= start)
  \param step : step (or stride)

  \warning If \b end \> \b start, \b size is computed automatically
  \warning If not \b size is fixed and \b end recomputed
 */
Range::Range(sa_size_t start, sa_size_t end, sa_size_t size, sa_size_t step)
{
  start_ = start;
  step_ = (step > 0) ? step : 1;
  if (end > start) {  // Taille calcule automatiquement 
    end_ = end;
    if (step_ > ((end_-start_)+1))  size_ = 1;
    else size_ = ((end-start)+1)/step_;
  }
  else {     // Taille fixee
    size_ = size;
    end_ = start_+size_*step_;
  }
}

/*
Range & Range::operator = (sa_size_t start)
{
  start_ = start;
  size_ = 1;
  step_ = 1;
  return (*this);
}
*/


//////////////////////////////////////////////////////////
/*!
  \class SOPHYA::IdentityMatrix
  \ingroup TArray
  Class to define an identity matrix
*/

//! Constructor of a (n,n) diagonal matrix with value diag on the diagonal
IdentityMatrix::IdentityMatrix(double diag, sa_size_t n)
{
  size_ = n;
  diag_ = diag;
}