/*
   There are a total of 3 entries in the algebraic variable array.
   There are a total of 2 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 (ms).
 * ALGEBRAIC[0] is J_stim in component J_stim (per_ms).
 * CONSTANTS[0] is IstimStart in component J_stim (ms).
 * CONSTANTS[1] is IstimEnd in component J_stim (ms).
 * CONSTANTS[2] is IstimAmplitude in component J_stim (per_ms).
 * CONSTANTS[3] is IstimPeriod in component J_stim (ms).
 * CONSTANTS[4] is IstimPulseDuration in component J_stim (ms).
 * STATES[0] is Vm in component membrane (dimensionless).
 * ALGEBRAIC[1] is J_in in component J_in (per_ms).
 * ALGEBRAIC[2] is J_out in component J_out (per_ms).
 * CONSTANTS[5] is tau_in in component J_in (ms).
 * STATES[1] is h in component J_in_h_gate (dimensionless).
 * CONSTANTS[6] is tau_open in component J_in_h_gate (ms).
 * CONSTANTS[7] is tau_close in component J_in_h_gate (ms).
 * CONSTANTS[8] is V_gate in component J_in_h_gate (dimensionless).
 * CONSTANTS[9] is tau_out in component J_out (ms).
 * RATES[0] is d/dt Vm in component membrane (dimensionless).
 * RATES[1] is d/dt h in component J_in_h_gate (dimensionless).
 * There are a total of 4 condition variables.
 */
void
initConsts(double* CONSTANTS, double* RATES, double *STATES)
{
CONSTANTS[0] = 0;
CONSTANTS[1] = 50000;
CONSTANTS[2] = 0.2;
CONSTANTS[3] = 500;
CONSTANTS[4] = 1;
STATES[0] = 0.00000820413566106744;
CONSTANTS[5] = 0.3;
STATES[1] = 0.8789655121804799;
CONSTANTS[6] = 120.0;
CONSTANTS[7] = 150.0;
CONSTANTS[8] = 0.13;
CONSTANTS[9] = 6.0;
RATES[0] = 0.1001;
RATES[1] = 0.1001;
}
void
computeResiduals(double VOI, double* CONSTANTS, double* RATES, double* OLDRATES, double* STATES,
                 double* OLDSTATES, double* ALGEBRAIC, double* CONDVARS)
{
resid[0] = RATES[0] - ALGEBRAIC[1]+ALGEBRAIC[2]+ALGEBRAIC[0];
resid[1] = RATES[1] - (CONDVAR[3]<0.00000 ? (1.00000 - STATES[1])/CONSTANTS[6] : - STATES[1]/CONSTANTS[7]);
}
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[0]>=0.00000&&CONDVAR[1]<=0.00000&&CONDVAR[2]<=0.00000 ? CONSTANTS[2] : 0.00000);
ALGEBRAIC[1] = ( STATES[1]*( pow(STATES[0], 2.00000)*(1.00000 - STATES[0])))/CONSTANTS[5];
ALGEBRAIC[2] = - (STATES[0]/CONSTANTS[9]);
}
void
getStateInformation(double* SI)
{
SI[0] = 1.0;
SI[1] = 1.0;
}
void
computeRoots(double VOI, double* CONSTANTS, double* RATES, double* OLDRATES, double* STATES,
             double* OLDSTATES, double* ALGEBRAIC, double* CONDVARS)
{
CONDVAR[0] = VOI - CONSTANTS[0];
CONDVAR[1] = VOI - CONSTANTS[1];
CONDVAR[2] = ((VOI - CONSTANTS[0]) -  floor((VOI - CONSTANTS[0])/CONSTANTS[3])*CONSTANTS[3]) - CONSTANTS[4];
CONDVAR[3] = STATES[0] - CONSTANTS[8];
}