//------------------------
// Includes
//------------------------
#include "MantidAlgorithms/CreateSingleValuedWorkspace.h"
#include "MantidAPI/WorkspaceFactory.h"
#include "MantidDataObjects/WorkspaceSingleValue.h"
#include "MantidKernel/BoundedValidator.h"
#include "MantidKernel/UnitFactory.h"

using namespace Mantid::Algorithms;

// Register the algorithm into the AlgorithmFactory
DECLARE_ALGORITHM(CreateSingleValuedWorkspace)

void CreateSingleValuedWorkspace::init() {
  using namespace Mantid::Kernel;
  using namespace Mantid::API;
  declareProperty(make_unique<WorkspaceProperty<>>("OutputWorkspace", "",
                                                   Direction::Output),
                  "Name to use for the output workspace");
  declareProperty("DataValue", 0.0, "The value to place in the workspace");
  auto mustBePositive = boost::make_shared<BoundedValidator<double>>();
  mustBePositive->setLower(0.0);
  declareProperty("ErrorValue", 0.0, mustBePositive,
                  "The error value to place in the workspace (default 0.0)");
}

void CreateSingleValuedWorkspace::exec() {
  // Get the property values
  double dataValue = getProperty("DataValue");
  double errorValue = getProperty("ErrorValue");

  using namespace Mantid::DataObjects;
  using namespace Mantid::API;
  using namespace Mantid::Kernel;
  // Create the workspace
  MatrixWorkspace_sptr singleValued =
      WorkspaceFactory::Instance().create("WorkspaceSingleValue", 1, 1, 1);

  singleValued->mutableX(0)[0] = 0.0;
  singleValued->mutableY(0)[0] = dataValue;
  singleValued->mutableE(0)[0] = errorValue;

  setProperty("OutputWorkspace", singleValued);
  // Done :)
}