library(PopED)
library(deSolve)


tmdd_qss_one_target_model_ode <- function(Time,State,Pars){
  with(as.list(c(State, Pars)), {   
    RTOT = A4
    CTOT= A2/V1
    CFREE = 0.5*((CTOT-RTOT-KSSS)+sqrt((CTOT-RTOT-KSSS)^2+4*KSSS*CTOT))
    
    dA1 = -KA*A1
    dA2 = FAVAIL*KA*A1+(Q/V2)*A3-(CL/V1+Q/V1)*CFREE*V1-RTOT*KINT*CFREE*V1/(KSSS+CFREE)  
    dA3 = (Q/V1)*CFREE*V1 - (Q/V2)*A3
    dA4 = R0*KDEG - KDEG*RTOT - (KINT-KDEG)*(RTOT*CFREE/(KSSS+CFREE))
    
    return(list(c(dA1,dA2,dA3,dA4)))  
  })
}

sfg <- function(x,a,bpop,b,bocc){
  parameters=c( CL=bpop[1]*exp(b[1])  ,
                V1=bpop[2]*exp(b[2])	,
                Q=bpop[3]*exp(b[3])	,
                V2=bpop[4]*exp(b[4])	,
                FAVAIL=bpop[5]*exp(b[5])	,
                KA=bpop[6]*exp(b[6])	,                       
                VMAX=bpop[7]*exp(b[7])	,
                KMSS=bpop[8]*exp(b[8])	,
                R0=bpop[9]*exp(b[9])	,
                KSSS=bpop[10]*exp(b[10])	,
                KDEG=bpop[11]*exp(b[11])	,
                KINT=bpop[12]*exp(b[12])	,
                DOSE=a[1]	,
                SC_FLAG=a[2])   
  return(parameters) 
}

tmdd_qss_one_target_model <- function(model_switch,xt,parameters,poped.db){
  with(as.list(parameters),{
    y=xt
    
    #The initialization vector for the compartment 
    A_ini <- c(A1=DOSE*SC_FLAG,
               A2=DOSE*(1-SC_FLAG),
               A3=0,
               A4=R0)
    
    #Set up time points for the ODE
    times_xt <- drop(xt)
    times <- sort(times_xt) 
    times <- c(0,times) ## add extra time for start of integration
    
    # solve the ODE
    out <- ode(A_ini, times, tmdd_qss_one_target_model_ode, parameters)#,atol=1e-13,rtol=1e-13)
    
    
    # extract the time points of the observations
    out = out[match(times_xt,out[,"time"]),]
    
    # Match ODE output to measurements
    RTOT = out[,"A4"]
    CTOT = out[,"A2"]/V1
    CFREE = 0.5*((CTOT-RTOT-KSSS)+sqrt((CTOT-RTOT-KSSS)^2+4*KSSS*CTOT))
    COMPLEX=((RTOT*CFREE)/(KSSS+CFREE))
    RFREE= RTOT-COMPLEX
    
    y[model_switch==1]= RTOT[model_switch==1]
    y[model_switch==2] =CFREE[model_switch==2]
    #y[model_switch==3]=RFREE[model_switch==3]
    
    return(list( y=y,poped.db=poped.db))
  })
}


tmdd_qss_one_target_model_ruv <- function(model_switch,xt,parameters,epsi,poped.db){
  returnArgs <- do.call(poped.db$model$ff_pointer,list(model_switch,xt,parameters,poped.db)) 
  y <- returnArgs[[1]]
  poped.db <- returnArgs[[2]]
  
  y[model_switch==1] = log(y[model_switch==1])+epsi[,1]
  y[model_switch==2] = log(y[model_switch==2])+epsi[,2]
  #y[model_switch==3] = log(y[model_switch==3])+epsi[,3]
  
  return(list(y=y,poped.db=poped.db)) 
}


#################################################
# for study 1 in gibiansky,JPKPD,2012 table 2 
#################################################

# for study 1 in gibiansky,JPKPD,2012 table 2 
poped.db.1 <- create.poped.database(ff_fun=tmdd_qss_one_target_model,
                                  fError_fun=tmdd_qss_one_target_model_ruv,
                                  fg_fun=sfg,
                                  groupsize=6,
                                  m=4,      #number of groups
                                  sigma=c(0.04,0.0225), 
                                  bpop=c(CL=0.3,V1=3,Q=0.2,V2=3,FAVAIL=0.7,KA=0.5,VMAX=0,
                                         KMSS=0,R0=0.1,KSSS=0.015,KDEG=10,KINT=0.05),
                                  d=c(CL=0.09,V1=0.09,Q=0.04,V2=0.04,FAVAIL=0.04,KA=0.16,VMAX=0,
                                      KMSS=0,R0=0.09,KSSS=0.09,KDEG=0.04,KINT=0.04), 
                                  notfixed_bpop=c( 1,1,1,1,1,1,0,0,1,1,1,1),
                                  notfixed_d=c( 1,1,1,1,1,1,0,0,1,1,1,1),
                                  xt=c(0.0417,0.25,0.5,1,3,7,14,21,28,35,42,49,56,
                                       0.0417,0.25,0.5,1,3,7,14,21,28,35,42,49,56),
                                  model_switch=c(1,1,1,1,1,1,1,1,1,1,1,1,1,
                                                 2,2,2,2,2,2,2,2,2,2,2,2,2),
                                  bUseGrouped_xt=1,
                                  G_xt=c(1,2,3,4,5,6,7,8,9,10,11,12,13,
                                         1,2,3,4,5,6,7,8,9,10,11,12,13),
                                  a=list(c(DOSE=100, SC_FLAG=0),
                                         c(DOSE=300, SC_FLAG=0),
                                         c(DOSE=600, SC_FLAG=0),
                                         c(DOSE=1000, SC_FLAG=1)),
                                  discrete_a = list(DOSE=seq(100,1000,by=100),
                                                    SC_FLAG=c(0,1)))

plot_model_prediction(poped.db.1,facet_scales="free")

# evaluation time is roughly 18 seconds 
# (macbook pro,OS X 10.13.5, 3.5 GHz Intel Core i7, 16 GB 2133 MHz LPDDR3)
# see compiled version below for a faster implementation
tic(); eval <- evaluate_design(poped.db.1); toc()



#### compiled version

# compile and load the qss_one_target.c code.
# make sure you are in the same directory as "tmdd_qss_one_target.c"
# to set this up see the 
# "R Package deSolve, Writing Code in Compiled Languages" 
# vingette in the deSolve documentation
system("R CMD SHLIB tmdd_qss_one_target.c")
dyn.load(paste("tmdd_qss_one_target", .Platform$dynlib.ext, sep = ""))


tmdd_qss_one_target_model_compiled <- function(model_switch,xt,parameters,poped.db){
  with(as.list(parameters),{
    y=xt
    
    #The initialization vector for the compartment 
    A_ini <- c(A1=DOSE*SC_FLAG,
               A2=DOSE*(1-SC_FLAG),
               A3=0,
               A4=R0)
    
    #Set up time points for the ODE
    times_xt <- drop(xt)
    times <- sort(times_xt) 
    times <- c(0,times) ## add extra time for start of integration
    
    # solve the ODE    
    out <- ode(A_ini, times, func = "derivs", parms = parameters,
               jacfunc = "jac", # not really needed, speed up is minimal if this is defined or not.
               dllname = "tmdd_qss_one_target",
               initfunc = "initmod", nout = 1, outnames = "Sum")
    
    # extract the time points of the observations
    out = out[match(times_xt,out[,"time"]),]
    
    # Match ODE output to measurements
    RTOT = out[,"A4"]
    CTOT = out[,"A2"]/V1
    CFREE = 0.5*((CTOT-RTOT-KSSS)+sqrt((CTOT-RTOT-KSSS)^2+4*KSSS*CTOT))
    COMPLEX=((RTOT*CFREE)/(KSSS+CFREE))
    RFREE= RTOT-COMPLEX
    
    y[model_switch==1]= RTOT[model_switch==1]
    y[model_switch==2] =CFREE[model_switch==2]
    #y[model_switch==3]=RFREE[model_switch==3]
    
    return(list( y=y,poped.db=poped.db))
  })
}

poped.db.1.comp <- create.poped.database(poped.db.1,
                                         ff_fun=tmdd_qss_one_target_model_compiled)
                                         
plot_model_prediction(poped.db.1.comp,facet_scales="free")

# evaluation time is roughly 1.2 seconds 
# same system as mentioned above
# makes optimization more reasonable
tic(); eval <- evaluate_design(poped.db.1.comp); toc()


#################################################
# for study 1 + 2 in gibiansky,JPKPD,2012 table 2 
#################################################

xt <- zeros(6,30)
study_1_xt <- matrix(rep(c(0.0417,0.25,0.5,1,3,7,14,21,28,35,42,49,56),8),nrow=4,byrow=T)
study_2_xt <- matrix(rep(c(0.0417,1,1,7,14,21,28,56,63,70,77,84,91,98,105),4),nrow=2,byrow=T)
xt[1:4,1:26] <- study_1_xt
xt[5:6,] <- study_2_xt

model_switch <- zeros(6,30)
model_switch[1:4,1:13] <- 1
model_switch[1:4,14:26] <- 2
model_switch[5:6,1:15] <- 1
model_switch[5:6,16:30] <- 2

G_xt <- zeros(6,30)
study_1_G_xt <- matrix(rep(c(1:13),8),nrow=4,byrow=T)
study_2_G_xt <- matrix(rep(c(14:28),4),nrow=2,byrow=T)
G_xt[1:4,1:26] <- study_1_G_xt
G_xt[5:6,] <- study_2_G_xt

poped.db.2 <- create.poped.database(ff_fun=tmdd_qss_one_target_model_compiled,
                                    fError_fun=tmdd_qss_one_target_model_ruv,
                                    fg_fun=sfg,
                                    groupsize=rbind(6,6,6,6,100,100),
                                    m=6,      #number of groups
                                    sigma=c(0.04,0.0225), 
                                    bpop=c(CL=0.3,V1=3,Q=0.2,V2=3,FAVAIL=0.7,KA=0.5,VMAX=0,
                                           KMSS=0,R0=0.1,KSSS=0.015,KDEG=10,KINT=0.05),
                                    d=c(CL=0.09,V1=0.09,Q=0.04,V2=0.04,FAVAIL=0.04,KA=0.16,VMAX=0,
                                        KMSS=0,R0=0.09,KSSS=0.09,KDEG=0.04,KINT=0.04), 
                                    notfixed_bpop=c( 1,1,1,1,1,1,0,0,1,1,1,1),
                                    notfixed_d=c( 1,1,1,1,1,1,0,0,1,1,1,1),
                                    xt=xt,
                                    model_switch=model_switch,
                                    ni=rbind(26,26,26,26,30,30),
                                    bUseGrouped_xt=1,
                                    G_xt=G_xt,
                                    a=list(c(DOSE=100, SC_FLAG=0),
                                           c(DOSE=300, SC_FLAG=0),
                                           c(DOSE=600, SC_FLAG=0),
                                           c(DOSE=1000, SC_FLAG=1),
                                           c(DOSE=600, SC_FLAG=0),
                                           c(DOSE=1000, SC_FLAG=1)),
                                    discrete_a = list(DOSE=seq(100,1000,by=100),
                                                      SC_FLAG=c(0,1)))


plot_model_prediction(poped.db.2,facet_scales="free")

# evaluation time is roughly 1.8 seconds 
tic(); eval_2 <- evaluate_design(poped.db.2); toc()

# now optimization in parallel for unix/mac
output <- poped_optim(poped.db.2,opt_xt = F, opt_a = T, parallel=T, method = c("LS")) 

# optimization for windows
# output <- poped_optim(poped.db.2,opt_xt = F, opt_a = T, parallel=T, method = c("LS"), dlls = c('tmdd_qss_one_target'))

plot_model_prediction(output$poped.db,facet_scales="free")
