#Server functions for module 1 step 2
c(
  
    ######### Set hidden variables #########    
      # Set hidden variable (Tmax and Vi)
      output$Mod1Step2_hidden <- renderUI({
        list(
          numericInput("Mod1Step2_Tmax", "", Modules_VAR$Tmax$max),
          matrixInput2("Mod1Step2_Vind", "",data.frame(matrix(c(1-input$Mod1Step2_Ve,rep(0,(nb.IS*nb.IS)-1)),nb.IS)))
        )
      }),
      outputOptions(output, "Mod1Step2_hidden", suspendWhenHidden = FALSE),
        
    ######### Run simulation #########
      Mod1Step2_output <- reactive({
        if(input$Mod1Step2_Run == 0) # if Run button is pressed
          return(NULL)
        
        isolate({
          
          updateCheckboxInput(session, "isRunning", value = TRUE)
          
          # Call app main function
          data <- squid::squidR(input, module="Mod1Step2") 
          
          LMR      <- lme4::lmer(Phenotype ~ 0 + (1|Individual), data = data$sampled_data)
          RANDEF   <- as.data.frame(lme4::VarCorr(LMR))$vcov
          
          data$Vi            <- round(RANDEF[1],2)
          data$Ve            <- round(RANDEF[2],2)
          data$Vp            <- data$Vi + data$Ve
          data$phenotypeMean <- round(mean(data$sampled_data$Phenotype),2)
          data$R             <- round(data$Vi / data$Vp,2)
          
          updateCheckboxInput(session, "isRunning", value = FALSE)
          
          return(data)
        })  
      }),
    
    ######### Display results (graph) #########
      # Display results (graph)
      output$Mod1Step2_plot <- renderPlot({ 
        
        data      <- Mod1Step2_output()
        
        if(!is.null(data)){
          
          Vp        <- paste("V'",NOT$total," = " , data$Vp)
          Vi        <- paste("V'",NOT$devI, " = " , data$Vi)
          Ve        <- paste("V'",NOT$mError," = ", data$Ve)
          
          myFactor  <- factor(rep(c(Vp,Vi,Ve), each=length(data$sampled_data$Phenotype)), levels=c(Vp,Vi,Ve))
          mydata    <- data.frame(dens  = c(data$sampled_data$Phenotype,data$sampled_data$I, data$sampled_data$e),
                                  lines = myFactor)
          
           ggplot2::ggplot(mydata, ggplot2::aes(dens, fill=lines, colour=lines)) +
                     ggplot2::geom_density(alpha = 0.1) +
                     ggplot2::geom_rug(ggplot2::aes(col=lines)) +
                	   ggplot2::facet_wrap(~ lines) +
                     ggplot2::xlab("Model component values") +
                     ggplot2::ylab("Density") + 
                     ggplot2::theme(legend.position="none")
          

        }else{
          print(plot(0,type='n',ann=FALSE, xaxt = "n", yaxt = "n"))
        }
                
      }),
      
      # Display results (table)
      output$Mod1Step2_summary_table <- renderUI({ 
        
        data <- Mod1Step2_output()
        
        myTable <- data.frame("True"     = c(paste("Total phenotypic variance ($V_",NOT$total,"$) = 1"),
                                            paste("Individual variance ($V_",NOT$devI,"$) =",1-input$Mod1Step2_Ve),
                                            paste("Measurement error variance ($V_",NOT$mError,"$) =",input$Mod1Step2_Ve),
                                            "Mean of the trait ($\\mu$) = 0"),
                              "Estimated"= c(paste("Total sampled Phenotypic variance ($V'_",NOT$total,"$) = ",ifelse(!is.null(data),data$Vp,"...")),
                                             paste("Sampled individual variance ($V'_",NOT$devI,"$) = ",ifelse(!is.null(data),data$Vi,"...")),
                                             paste("Measurement error in sample ($V'_",NOT$mError,"$) = ",ifelse(!is.null(data),data$Ve,"...")),
                                             paste("Sampled mean of the trait ($\\mu'$) = ",ifelse(!is.null(data),data$phenotypeMean,"...")))
                              )
                  
        getTable(myTable)
        
      }),
      
      # display results: repeatability (text)
      output$Mod1Step2_Rep_txt   <- renderText({ HTML(paste("Your repeatability is ", ifelse(!is.null(Mod1Step2_output()), 
                                                                                             Mod1Step2_output()$R,"...")))}),
      # Display repeatability result (graph)
      output$Mod1Step2_plot2 <- renderPlot({ 
        
        if(!is.null(Mod1Step2_output())){
          
          data         <- Mod1Step2_output()$sampled_data
          phen_time1   <- subset(data, data$Time == data$Time[1], select=Phenotype)
          phen_time2   <- subset(data, data$Time == data$Time[2], select=Phenotype)
          data_plot <- data.frame("phen_time1"=phen_time1$Phenotype, "phen_time2"=phen_time2$Phenotype)
          
          ggplot2::ggplot(data_plot, ggplot2::aes(x=phen_time1, y=phen_time2)) + 
          	   ggplot2::geom_point(size=3, color=color$color2) +
	          	 ggplot2::xlab("First measurement") +
	          	 ggplot2::ylab("Second measurement")
          
        }else{ plot(0,type='n',ann=FALSE, xaxt = "n", yaxt = "n") }
      })
            
  ) # End return