!--------------------------------------------------------------------------------------------------
!> @author Martin Diehl, Max-Planck-Institut für Eisenforschung GmbH
!> @author Pratheek Shanthraj, Max-Planck-Institut für Eisenforschung GmbH
!> @brief material subroutine for thermal source due to plastic dissipation
!> @details to be done
!--------------------------------------------------------------------------------------------------
module source_thermal_dissipation
  use prec
  use debug
  use discretization
  use material
  use config
 
  implicit none
  private

  integer,           dimension(:),   allocatable :: &
    source_thermal_dissipation_offset, &                                                            !< which source is my current thermal dissipation mechanism?
    source_thermal_dissipation_instance                                                             !< instance of thermal dissipation source mechanism
 
  type :: tParameters                                                                               !< container type for internal constitutive parameters
    real(pReal) :: &
      kappa
  end type tParameters
 
  type(tParameters), dimension(:),   allocatable :: param                                           !< containers of constitutive parameters (len Ninstance)
 
 
  public :: &
    source_thermal_dissipation_init, &
    source_thermal_dissipation_getRateAndItsTangent
 
contains


!--------------------------------------------------------------------------------------------------
!> @brief module initialization
!> @details reads in material parameters, allocates arrays, and does sanity checks
!--------------------------------------------------------------------------------------------------
subroutine source_thermal_dissipation_init
 
  integer :: Ninstance,instance,source,sourceOffset,NofMyPhase,p   
 
  write(6,'(/,a)')   ' <<<+-  source_'//SOURCE_thermal_dissipation_label//' init  -+>>>'; flush(6)
 
  
  Ninstance = count(phase_source == SOURCE_thermal_dissipation_ID)
  if (Ninstance == 0) return
  if (iand(debug_level(debug_constitutive),debug_levelBasic) /= 0) &
    write(6,'(a16,1x,i5,/)') '# instances:',Ninstance
  
  allocate(source_thermal_dissipation_offset(material_Nphase), source=0)
  allocate(source_thermal_dissipation_instance(material_Nphase), source=0)
  allocate(param(Ninstance))
  
  do p = 1, material_Nphase
    source_thermal_dissipation_instance(p) = count(phase_source(:,1:p) == SOURCE_thermal_dissipation_ID)
    do source = 1, phase_Nsources(p)
      if (phase_source(source,p) == SOURCE_thermal_dissipation_ID) &
        source_thermal_dissipation_offset(p) = source
    enddo    
  enddo
    
  do p=1, size(config_phase)
    if (all(phase_source(:,p) /= SOURCE_THERMAL_DISSIPATION_ID)) cycle
    instance = source_thermal_dissipation_instance(p)
    param(instance)%kappa = config_phase(p)%getFloat('dissipation_coldworkcoeff')
    NofMyPhase = count(material_phaseAt==p) * discretization_nIP
    sourceOffset = source_thermal_dissipation_offset(p)
 
    call material_allocateSourceState(p,sourceOffset,NofMyPhase,0,0,0)
  
  enddo
  
end subroutine source_thermal_dissipation_init


!--------------------------------------------------------------------------------------------------
!> @brief returns dissipation rate
!--------------------------------------------------------------------------------------------------
subroutine source_thermal_dissipation_getRateAndItsTangent(TDot, dTDOT_dT, Tstar, Lp, phase)

  integer, intent(in) :: &
    phase
  real(pReal),  intent(in), dimension(3,3) :: &
    Tstar
  real(pReal),  intent(in), dimension(3,3) :: &
    Lp
  real(pReal),  intent(out) :: &
    TDot, &
    dTDOT_dT
  integer :: &
    instance
 
  instance = source_thermal_dissipation_instance(phase)
  
  TDot = param(instance)%kappa*sum(abs(Tstar*Lp))
  dTDOT_dT = 0.0_pReal       
 
end subroutine source_thermal_dissipation_getRateAndItsTangent
 
end module source_thermal_dissipation