/*
   There are a total of 3 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 14 entries in the constant variable array.
 */
/*
 * VOI is time in component environment (day).
 * STATES[0] is X in component X (dimensionless).
 * CONSTANTS[0] is mu0 in component X (first_order_rate_constant).
 * CONSTANTS[1] is lamda in component X (first_order_rate_constant).
 * STATES[1] is K in component K (first_order_rate_constant).
 * STATES[2] is V in component V (dimensionless).
 * STATES[3] is Y in component Y (dimensionless).
 * CONSTANTS[2] is mu1 in component Y (first_order_rate_constant).
 * CONSTANTS[3] is a in component Y (dimensionless).
 * STATES[4] is Z in component Z (dimensionless).
 * ALGEBRAIC[0] is CD4 in component CD4 (dimensionless).
 * CONSTANTS[4] is mu2 in component V (first_order_rate_constant).
 * CONSTANTS[5] is beta in component V (first_order_rate_constant).
 * CONSTANTS[6] is b in component V (dimensionless).
 * CONSTANTS[7] is theta in component Z (first_order_rate_constant).
 * CONSTANTS[8] is rho in component Z (first_order_rate_constant).
 * ALGEBRAIC[1] is f_X in component Z (dimensionless).
 * ALGEBRAIC[2] is g_V in component Z (dimensionless).
 * CONSTANTS[9] is C1 in component Z (dimensionless).
 * CONSTANTS[10] is C2 in component Z (dimensionless).
 * CONSTANTS[11] is X0 in component Z (dimensionless).
 * CONSTANTS[12] is omega in component K (first_order_rate_constant).
 * CONSTANTS[13] is Kmax in component K (first_order_rate_constant).
 * RATES[0] is d/dt X in component X (dimensionless).
 * RATES[3] is d/dt Y in component Y (dimensionless).
 * RATES[2] is d/dt V in component V (dimensionless).
 * RATES[4] is d/dt Z in component Z (dimensionless).
 * RATES[1] is d/dt K in component K (first_order_rate_constant).
 */
void
initConsts(double* CONSTANTS, double* RATES, double *STATES)
{
STATES[0] = 1.0E11;
CONSTANTS[0] = 4.0E-3;
CONSTANTS[1] = 4.0E8;
STATES[1] = 1.35E-14;
STATES[2] = 1.0;
STATES[3] = 1.0;
CONSTANTS[2] = 0.30;
CONSTANTS[3] = 1.0;
STATES[4] = 0.0;
CONSTANTS[4] = 1.0;
CONSTANTS[5] = 1.0E3;
CONSTANTS[6] = 1.0;
CONSTANTS[7] = 1.0E-6;
CONSTANTS[8] = 0.50;
CONSTANTS[9] = 0.04;
CONSTANTS[10] = 1.0E3;
CONSTANTS[11] = 1.0E11;
CONSTANTS[12] = 1.0E-16;
CONSTANTS[13] = 20.0;
}
void
computeRates(double VOI, double* CONSTANTS, double* RATES, double* STATES, double* ALGEBRAIC)
{
RATES[0] = CONSTANTS[1] - ( CONSTANTS[0]*STATES[0]+ STATES[1]*STATES[2]*STATES[0]);
RATES[3] =  STATES[1]*STATES[2]*STATES[3] -  CONSTANTS[2]*(1.00000+ CONSTANTS[3]*STATES[4])*STATES[3];
RATES[2] =  CONSTANTS[5]*STATES[3] -  CONSTANTS[4]*(1.00000+ CONSTANTS[6]*STATES[4])*STATES[2];
RATES[1] =  CONSTANTS[12]*STATES[2]*(CONSTANTS[13] - STATES[1]);
ALGEBRAIC[1] = ( (1.00000+CONSTANTS[9])*pow(STATES[0]/CONSTANTS[11], 2.00000))/(CONSTANTS[9]+pow(STATES[0]/CONSTANTS[11], 2.00000));
ALGEBRAIC[2] = STATES[2]/(CONSTANTS[10]+STATES[2]);
RATES[4] =  CONSTANTS[7]*ALGEBRAIC[2]+ CONSTANTS[8]*(ALGEBRAIC[1] - STATES[4])*STATES[4];
}
void
computeVariables(double VOI, double* CONSTANTS, double* RATES, double* STATES, double* ALGEBRAIC)
{
ALGEBRAIC[1] = ( (1.00000+CONSTANTS[9])*pow(STATES[0]/CONSTANTS[11], 2.00000))/(CONSTANTS[9]+pow(STATES[0]/CONSTANTS[11], 2.00000));
ALGEBRAIC[2] = STATES[2]/(CONSTANTS[10]+STATES[2]);
ALGEBRAIC[0] = (STATES[0]+STATES[3])/1.00000e+11;
}