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//---------------------------------------------------------------------------
//
// ClassName:   G4ExtendedMaterial
//
// Description: Contains extended material properties
//
// Class description:
//
// Is used to define the additional material information. This class
// contains a map of G4VMaterialExtension associated with an integer key.
//

#ifndef G4EXTENDEDMATERIAL_HH
#define G4EXTENDEDMATERIAL_HH 1

#include "G4Material.hh"
#include "G4VMaterialExtension.hh"  //Needed for hash defintion

#include <memory>
#include <unordered_map>

// A map for material extensions based on the hash of the name.
// Extensions are owned by the map
using G4MaterialExtensionMap = std::unordered_map<G4String,  // KEY
  std::unique_ptr<G4VMaterialExtension>,  // VALUE
  G4MaterialExtensionHash>;  // HASHING FUNCTOR

class G4ExtendedMaterial : public G4Material
{
 public:  // with description
  // Constructor to create an extended material from the base-class G4Material
  G4ExtendedMaterial(const G4String& name,  // its name
    const G4Material* baseMaterial);  // base material

  // Constructor to create an extended material from single element
  G4ExtendedMaterial(const G4String& name,  // its name
    G4double z,  // atomic number
    G4double a,  // mass of mole
    G4double density,  // density
    G4State state = kStateUndefined,  // solid,gas
    G4double temp = NTP_Temperature,  // temperature
    G4double pressure = CLHEP::STP_Pressure);  // pressure

  // Constructor to create an extended material from a combination of elements
  // and/or materials subsequently added via AddElement and/or AddMaterial
  G4ExtendedMaterial(const G4String& name,  // its name
    G4double density,  // density
    G4int nComponents,  // nbOfComponents
    G4State state = kStateUndefined,  // solid,gas
    G4double temp = NTP_Temperature,  // temperature
    G4double pressure = CLHEP::STP_Pressure);  // pressure

  // Constructor to create an extended material from the base extended material
  G4ExtendedMaterial(const G4String& name,  // its name
    G4double density,  // density
    const G4ExtendedMaterial* baseMaterial,  // base material
    G4State state = kStateUndefined,  // solid,gas
    G4double temp = NTP_Temperature,  // temperature
    G4double pressure = CLHEP::STP_Pressure);  // pressure

  ~G4ExtendedMaterial() override = default;

  // register G4VMaterialExtension
  // This class owns extensions. Register with:
  // RegisterExtension(std::unique_ptr<MyExtension>(new MyExtension("name")));
  // or:
  // RegisteerExtension(std::make_unique<MyExtension>("name"));
  void RegisterExtension(std::unique_ptr<G4VMaterialExtension> extension);

  // retrieve G4VMaterialExtension, null pointer is returned if model is not available
  G4VMaterialExtension* RetrieveExtension(const G4String& name);

  inline G4int GetNumberOfExtensions() const { return G4int(fExtensionMap.size()); }

  // Retrieve iterators, proxyes to c++ methods. These are const for read-only
  // access. Use Register/RetreiveExtension to modify map
  G4MaterialExtensionMap::const_iterator begin() const { return fExtensionMap.begin(); }
  G4MaterialExtensionMap::const_iterator cbegin() const { return fExtensionMap.cbegin(); }
  G4MaterialExtensionMap::const_iterator end() const { return fExtensionMap.end(); }
  G4MaterialExtensionMap::const_iterator cend() const { return fExtensionMap.cend(); }

  G4bool IsExtended() const override;
  void Print(std::ostream& flux) const;

 private:
  G4MaterialExtensionMap fExtensionMap;
};

#endif