/*
   There are a total of 4 entries in the algebraic variable array.
   There are a total of 5 entries in each of the rate and state variable arrays.
   There are a total of 10 entries in the constant variable array.
 */
/*
 * VOI is time in component environment (minute).
 * CONSTANTS[0] is BFM in component muscle_O2_delivery (L_per_minute).
 * CONSTANTS[1] is OVA in component muscle_O2_delivery (mL_per_L).
 * CONSTANTS[2] is HM in component muscle_O2_delivery (dimensionless).
 * CONSTANTS[3] is AOM in component muscle_O2_delivery (dimensionless).
 * CONSTANTS[9] is O2ARTM in component M_O2_blood_supply (mL_per_minute).
 * STATES[1] is RMO in component delivery_of_O2_to_M_tissues (mL_per_minute).
 * STATES[2] is PVO in component M_venous_O2_content (mmHg).
 * CONSTANTS[4] is EXC in component parameter_values (dimensionless).
 * CONSTANTS[5] is EXCXP2 in component parameter_values (dimensionless).
 * STATES[3] is OVS in component M_venous_O2_content (dimensionless).
 * ALGEBRAIC[1] is PMO in component pressure_of_O2_in_M_tissue_cells (mmHg).
 * ALGEBRAIC[3] is MMO in component metabolic_O2_consumption_by_M_tissue (mL_per_minute).
 * ALGEBRAIC[2] is P2O in component metabolic_O2_consumption_by_M_tissue (mmHg).
 * CONSTANTS[6] is OMM in component parameter_values (mL_per_minute).
 * CONSTANTS[7] is PM5 in component parameter_values (per_mmHg).
 * ALGEBRAIC[0] is QOM in component volume_of_O2_in_M_tissue (mL).
 * STATES[4] is DO2M in component volume_of_O2_in_M_tissue (mL_per_minute).
 * STATES[0] is QOM1 in component volume_of_O2_in_M_tissue (mL).
 * CONSTANTS[8] is PK2 in component parameter_values (mmHg_per_mL).
 * RATES[0] is d/dt QOM1 in component volume_of_O2_in_M_tissue (mL).
 * There are a total of 2 condition variables.
 */
void
initConsts(double* CONSTANTS, double* RATES, double *STATES)
{
CONSTANTS[0] = 0.989949;
CONSTANTS[1] = 204.497;
CONSTANTS[2] = 40.0381;
CONSTANTS[3] = 1.00002;
CONSTANTS[4] = 1;
CONSTANTS[5] = 0.17;
CONSTANTS[6] = 57.1;
CONSTANTS[7] = 30;
STATES[0] = 48.0839;
CONSTANTS[8] = 0.79167;
CONSTANTS[9] =  CONSTANTS[1]*CONSTANTS[0];
STATES[1] = 57.064;
STATES[2] = 39.9701;
STATES[3] = 0.699673;
STATES[4] = 0.1001;
RATES[0] = 0.1001;
}
void
computeResiduals(double VOI, double* CONSTANTS, double* RATES, double* OLDRATES, double* STATES,
                 double* OLDSTATES, double* ALGEBRAIC, double* CONDVARS)
{
resid[0] = STATES[3] - (CONSTANTS[9] - STATES[1])/( CONSTANTS[2]*5.25000*CONSTANTS[0]);
resid[1] = STATES[2] -  57.1400*STATES[3]*pow(CONSTANTS[4], CONSTANTS[5]);
resid[2] = STATES[1] -  (STATES[2] - ALGEBRAIC[1])*CONSTANTS[7]*CONSTANTS[0];
resid[3] = STATES[4] - STATES[1] - ALGEBRAIC[3];
resid[4] = RATES[0] - STATES[4];
}
void
computeVariables(double VOI, double* CONSTANTS, double* RATES, double* STATES, double* ALGEBRAIC)
{
}
void
computeEssentialVariables(double VOI, double* CONSTANTS, double* RATES, double* STATES, double* ALGEBRAIC)
{
ALGEBRAIC[0] = (CONDVAR[1]<0.00000 ? 0.000100000 : STATES[0]);
ALGEBRAIC[1] =  CONSTANTS[8]*ALGEBRAIC[0];
ALGEBRAIC[2] = (CONDVAR[0]>0.00000 ? 38.0000 : ALGEBRAIC[1]);
ALGEBRAIC[3] =  CONSTANTS[3]*CONSTANTS[6]*CONSTANTS[4]*(1.00000 - pow(38.0001 - ALGEBRAIC[2], 3.00000)/54872.0);
}
void
getStateInformation(double* SI)
{
SI[1] = 0.0;
SI[2] = 0.0;
SI[3] = 0.0;
SI[4] = 0.0;
SI[0] = 1.0;
}
void
computeRoots(double VOI, double* CONSTANTS, double* RATES, double* OLDRATES, double* STATES,
             double* OLDSTATES, double* ALGEBRAIC, double* CONDVARS)
{
CONDVAR[0] = ALGEBRAIC[1] - 38.0000;
CONDVAR[1] = STATES[0] - 0.000100000;
}