# "Biophysical modeling of the whole-cell dynamics of C. elegans motor and interneurons families"
# M. Nicoletti et al. PloS ONE, 19(3): e0298105.
# https://doi.org/10.1371/journal.pone.0298105


def RIM_simulation_vc(gRIM_scaled,vstart,vstop,ns):
    

    from neuron import h,gui
    import numpy
    import math
    from operator import add
    
    
    
             
    surf=103.34e-8 # surface in cm^2 form neuromorpho RIML
    vol=10.94e-12 # total volume
    L=math.sqrt(surf/math.pi)
    rsoma=L*1e4
    cm_uFcm2=gRIM_scaled[8]
    
    
    soma=h.Section(name="soma")
    soma.L=rsoma
    soma.diam=rsoma
    soma.Ra=100
    soma.cm=cm_uFcm2
    h.psection(sec=soma)
    
    soma.insert('shl1')
    soma.insert('egl2')
    soma.insert('irk')
    soma.insert('cca1')
    soma.insert('unc2')
    soma.insert('egl19')
    soma.insert('leak')
    
        
    for seg in soma:
        
        seg.shl1.gbar=gRIM_scaled[0]
        seg.egl2.gbar=gRIM_scaled[1]
        seg.irk.gbar=gRIM_scaled[2]
        seg.cca1.gbar=gRIM_scaled[3]
        seg.unc2.gbar=gRIM_scaled[4]
        seg.egl19.gbar=gRIM_scaled[5]
        seg.leak.gbar=gRIM_scaled[6]
        
        seg.leak.e=gRIM_scaled[7]
           
        seg.eca=60
        seg.ek=-80
        
        
    stim=h.VClamp(soma(0.5))
    dir(stim)
    
    simdur = 1700
    stim.amp[0]=-60
    stim.amp[1]=-110
    stim.amp[2]=-60
    stim.dur[0]=1100
    stim.dur[1]=500
    stim.dur[2]=100
    
    ik_vec = h.Vector()   
    ica_vec=h.Vector()
    inca_vec=h.Vector()
    ileakRIM_vec=h.Vector()
    t_vec = h.Vector()  
    #curr_shl1_vec=h.Vector()

   
      # Time stamp vector
    ik_vec.record(soma(0.5)._ref_ik)
    ica_vec.record(soma(0.5)._ref_ica)
   # inca_vec.record(soma(0.5)._ref_i_nca)
    ileakRIM_vec.record(soma(0.5)._ref_i_leak)
   # curr_shl1_vec.record(soma(0.5)._ref_curr_shl1)

    t_vec.record(h._ref_t)
    
    ref_ik=[]
    ref_ica=[]
    ref_t=[]
    #ref_inca=[]
    ref_ileakRIM=[]
    #ref_curr_shl1=[]

        
    for i in numpy.linspace(start=vstart, stop=vstop, num=ns):
        
        stim.amp[1]=i
        h.tstop=simdur
        h.dt=0.01
        h.finitialize(-60)
        h.run()
        
        #time
        ref_t_vec=numpy.zeros_like(t_vec)
        t_vec.to_python(ref_t_vec)
        ref_t.append(ref_t_vec)
        
        # potassium current
        ref_ik_vec=numpy.zeros_like(ik_vec)
        ik_vec.to_python(ref_ik_vec)
        ref_ik.append(ref_ik_vec)
        
        #calcium currents
        ref_ica_vec=numpy.zeros_like(ica_vec)
        ica_vec.to_python(ref_ica_vec)
        ref_ica.append(ref_ica_vec)
        
    
        # LEAKAGE current
        ref_ileakRIM_vec=numpy.zeros_like(ileakRIM_vec)
        ileakRIM_vec.to_python(ref_ileakRIM_vec)
        ref_ileakRIM.append(ref_ileakRIM_vec)
    
    
    
     
    # total current calculation
    itot=[]
    itot=map(sum, zip(ref_ik,ref_ica,ref_ileakRIM))        
    current=numpy.array(list(itot))
    inorm=current*1e9*surf #total current in pA
    #time array
    time1=numpy.array(ref_t)
    resc_ind=numpy.where(time1[1,:]>=1000)
    resc_min=numpy.amin(resc_ind)
    resc_max=numpy.amax(resc_ind)
    itot_normalized=inorm[:,resc_min:resc_max]
    time=time1[:,resc_min:resc_max]-1000
    
    
    ## CALCULATION OF STEADY-STATE CURRENT-VOLATGE RELATION
    ind=numpy.where(numpy.logical_and(time[0]>=550, time[0]<=599))
    ind_max=numpy.amax(ind)
    ind_min=numpy.amin(ind)
    iv=numpy.mean(itot_normalized[:,ind_min:ind_max],axis=1)
	
	 # CALCULATION OF PEAK CURRENT-VOLTAGE RELATION (as in Ramot et al 2008)
    ind2=numpy.where(numpy.logical_and(time[0]>=100, time[0]<=200))
    ind2_max=numpy.amax(ind2)
    ind2_min=numpy.amin(ind2)
    iv_peak=numpy.amax(itot_normalized[:,ind2_min:ind2_max])
    iv_peak=[]
    
    #for j in range(ns):
     #   peak=numpy.amax(itot_normalized[j,ind2_min:ind2_max])
     #   iv_peak.append(peak)
    #iv_peak=numpy.array(list(iv_peak))
    
    
    
    for j in range(ns):
        if j<=6:
            peak=numpy.amin(itot_normalized[j,ind2_min:ind2_max])
        else:
            peak=numpy.amax(itot_normalized[j,ind2_min:ind2_max])
        iv_peak.append(peak)

    return itot_normalized, time, iv_peak, iv