/* Distributed under the Apache License, Version 2.0.
   See accompanying NOTICE file for details.*/


#include "stdafx.h"
#include "Inhaler.h"
#include "circuit/SECircuit.h"
#include "circuit/SECircuitPath.h"
#include "circuit/SECircuitNode.h"
#include "properties/SEScalarLength.h"
#include "properties/SEScalarFlowResistance.h"
#include "properties/SEScalarMassPerVolume.h"
#include "properties/SEScalar0To1.h"
#include "system/physiology/SERespiratorySystem.h"
#include "patient/actions/SEConsciousRespiration.h"
#include "patient/actions/SEUseInhaler.h"

/*
========================
Constructors
========================
*/

Inhaler::Inhaler(PulseController& data) : SEInhaler(data.GetSubstances()), m_data(data)
{
  Clear();
}

Inhaler::~Inhaler()
{
  Clear();
}

void Inhaler::Clear()
{
  SEInhaler::Clear();
  m_Mouthpiece = nullptr;
  m_AerosolMouthpiece = nullptr;
  m_AmbientEnv = nullptr;
  m_InhalerDrug = nullptr;
}

//--------------------------------------------------------------------------------------------------
/// \brief
/// Initializes system properties to valid homeostatic values.
//--------------------------------------------------------------------------------------------------
void Inhaler::Initialize()
{
  PulseSystem::Initialize();
  m_InhalerDrug = nullptr;
}

void Inhaler::Load(const pulse::InhalerData& src, Inhaler& dst)
{
  Inhaler::Serialize(src, dst);
  dst.SetUp();
}
void Inhaler::Serialize(const pulse::InhalerData& src, Inhaler& dst)
{
  SEInhaler::Serialize(src.common(), dst);
}

pulse::InhalerData* Inhaler::Unload(const Inhaler& src)
{
  pulse::InhalerData* dst = new pulse::InhalerData();
  Inhaler::Serialize(src, *dst);
  return dst;
}
void Inhaler::Serialize(const Inhaler& src, pulse::InhalerData& dst)
{
  SEInhaler::Serialize(src, *dst.mutable_common());
}

void Inhaler::SetUp()
{
  // Time step - used by inhaler timer
  m_dt_s = m_data.GetTimeStep().GetValue(TimeUnit::s);

  m_AmbientEnv = m_data.GetCompartments().GetGasCompartment(pulse::EnvironmentCompartment::Ambient);
  m_Mouthpiece = m_data.GetCompartments().GetGasCompartment(pulse::InhalerCompartment::Mouthpiece);
  m_AerosolMouthpiece = m_data.GetCompartments().GetLiquidCompartment(pulse::InhalerCompartment::Mouthpiece);
 
  if (m_State == cdm::eSwitch::On)
  {
    if (m_Substance == nullptr)
    {
      Fatal("State is on, but without a substance");
    }
    else
    {
      m_InhalerDrug = m_AerosolMouthpiece->GetSubstanceQuantity(*m_Substance);
    }
  }
}

//--------------------------------------------------------------------------------------------------
/// \brief
/// Inhaler Action Preprocessor
///
/// \param  None
///
/// \return void
///
/// \details
/// This method:
///  <UL>
///   <LI>Determines when to activate the inhaler given an inhaler command.</LI>
///   <LI>Starts and stops the inhaler.</LI>
///   <LI>Models deposition of inhaled substance in the orthopharynx</LI>
///  </UL>
///
//--------------------------------------------------------------------------------------------------
void Inhaler::PreProcess()
{
  if (m_data.GetActions().GetInhalerActions().HasConfiguration())
  {
    cdm::eSwitch state = GetState();
    SEInhalerConfiguration* config = m_data.GetActions().GetInhalerActions().GetConfiguration();
    ProcessConfiguration(*config);
    m_data.GetActions().GetInhalerActions().RemoveConfiguration();    
    if (state != m_State)
    {
      m_State = state;
      Warning("Pulse does not allow you to change inhaler state via the configuration, please use a Conscious Respiration Action. Ignoring the configuration state.");
    }
  }
  if (m_data.GetActions().GetPatientActions().HasConsciousRespiration())
  {
    SEConsciousRespiration* cr = m_data.GetActions().GetPatientActions().GetConsciousRespiration();
    SEConsciousRespirationCommand* cmd = cr->GetActiveCommand();
    SEUseInhaler* ui = dynamic_cast<SEUseInhaler*>(cmd);
    if (ui != nullptr)
    {
      Administer();
      cr->RemoveActiveCommand();
    }
  }

  // ### HANDLE INHALER-BASED UPDATES
  if (m_State == cdm::eSwitch::On)
  {
    //  Check to see if there is a substantial mass of substance on the inhaler node.
    //  If not, we'll disconnect the inhaler.    
    double dCInhalerSubstanceMass_ug = m_InhalerDrug->GetMass(MassUnit::ug);
    if (SEScalar::IsZero(dCInhalerSubstanceMass_ug,1e-7))
    {
      Info("Inhaler removed!");
      m_InhalerDrug = nullptr;
      m_State = cdm::eSwitch::Off;
      m_data.SetAirwayMode(pulse::eAirwayMode::Free);
    }
  }
}

void Inhaler::StateChange()
{
  SEInhaler::StateChange();

}


//--------------------------------------------------------------------------------------------------
/// \brief
/// Administer Substance Using Inhaler 
///
/// \param  None
///
/// \return void
///
/// \details
/// This method initializes substance values in the inhaler when actuated.  It is called once
/// per actuation. 
//--------------------------------------------------------------------------------------------------
void Inhaler::Administer()
{
  // Check to see if the inhaler is already on. We should not run this method unless the
  //  inhaler is currently off and about to be activated.
  if (m_State == cdm::eSwitch::On)
  {
    /// \error: Already processing a Substance Inhalation, ignoring this command.
    Error("Already processing a Substance Inhalation, ignoring this command");
    return;
  }

  // Alert the user that the inhaler is actuated
  Info("Inhaler actuated!");
  m_State = cdm::eSwitch::On;
  m_data.SetAirwayMode(pulse::eAirwayMode::Inhaler);

  // Initialize pressure in the inhaler node to ambient  
  double dAmbientPressure = m_AmbientEnv->GetPressure(PressureUnit::cmH2O);
  m_Mouthpiece->GetPressure().SetValue(dAmbientPressure, PressureUnit::cmH2O);

  // Copy the environment substance data to the mouth piece
  m_Mouthpiece->ZeroSubstanceQuantities();
  for (size_t i = 0; i < m_AmbientEnv->GetSubstanceQuantities().size(); i++)
  {
    m_Mouthpiece->GetSubstanceQuantities()[i]->GetVolumeFraction().Set(m_AmbientEnv->GetSubstanceQuantities()[i]->GetVolumeFraction());
  }
  m_Mouthpiece->Balance(BalanceGasBy::VolumeFraction);

  // Add the dose substance to the list of active substances to be tracked in Pulse
  m_data.GetSubstances().AddActiveSubstance((SESubstance&)*m_Substance);

  // Get the inhaler node volume
  double dVolume_L = m_Mouthpiece->GetVolume(VolumeUnit::L);

  // Check to see if there is a spacer.  If so, change the inhaler volume. 
  if (m_SpacerVolume!=nullptr)
  {
    double dSpacerVolume_L = m_SpacerVolume->GetValue(VolumeUnit::L);
    dVolume_L += dSpacerVolume_L;
    m_Mouthpiece->GetVolume().SetValue(dVolume_L, VolumeUnit::L);
  }

  // Get dose properties we need
  double dDoseDensity_ug_Per_L = 0.0;
  if (m_Substance->HasDensity())
  {
    dDoseDensity_ug_Per_L = m_Substance->GetDensity(MassPerVolumeUnit::ug_Per_L);  // Density of dose in micrograms per liter
  }
  else
  {
    /// \error Fatal: Inhaled substance does not have a density value.
    Fatal("Inhaled substance does not have a density value.");
  }

  // Dosage amount in micrograms
  double dDoseMass_ug = m_MeteredDose->GetValue(MassUnit::ug);

  // Reduce the total dose to account for nozzle losses
  double dNozzleLossFraction = m_NozzleLoss->GetValue();

  dDoseMass_ug *= (1 - dNozzleLossFraction);

  // Loop all the substances on the inhaler node
  for (SELiquidSubstanceQuantity* subQ : m_AerosolMouthpiece->GetSubstanceQuantities())
  {
    if (!subQ->HasMass())
      continue;

    if (&subQ->GetSubstance() == m_Substance)
    {
      // This is the metered dose of the substance we're adding to the inhaler      
      m_InhalerDrug = subQ;
      m_InhalerDrug->GetMass().SetValue(dDoseMass_ug,MassUnit::ug);
    }    
  }
  m_InhalerDrug->Balance(BalanceLiquidBy::Mass);

}

//--------------------------------------------------------------------------------------------------
/// \brief
/// Inhaler system process function
///
/// \details
/// Currently not used.
//--------------------------------------------------------------------------------------------------
void Inhaler::Process()
{
  
}

//--------------------------------------------------------------------------------------------------
/// \brief
/// Inhaler system postprocess function
///
/// \details
/// Currently not used.
//--------------------------------------------------------------------------------------------------
void Inhaler::PostProcess()
{

}