## Server.R
## MAIN FUNCTION
function(input, output, session) {

  # input data (with default)
  values <- reactiveValues(data_primary = ExampleData.DeValues$CA1,
                           data_secondary = setNames(as.data.frame(matrix(NA_real_, nrow = 5, ncol = 2)), c("x", "y")),
                           data = NULL,
                           args = NULL)

  ### GET DATA SETS
  observe({

    ### GET DATA
    data <- list(values$data_primary, values$data_secondary)
    data <- lapply(data, function(x) {
      x_tmp <- x[complete.cases(x), ]
      if (nrow(x_tmp) == 0) return(NULL)
      else return(x_tmp)
    })
    data <- data[!sapply(data, is.null)]
    data <- lapply(data, function(x) setNames(x, c("Dose", "Error")))

    ### DATA FILTER
    input$exclude

    sub <- data

    isolate({
      filter.prim<- input$filter.prim
      filter.sec<- input$filter.sec
    })

    if(!is.null(filter.prim)) {
      index<- grep(paste(filter.prim, collapse = "|"), data[[1]][,1])
      sub[[1]]<- data[[1]][-index,]
    }
    if(length(data) == 2 && !is.null(filter.sec)) {
      index<- grep(paste(filter.sec, collapse = "|"), data[[2]][,1])
      sub[[2]]<- data[[2]][-index,]
    }

    stillSelected.prim<- filter.prim
    stillSelected.sec<- filter.sec

    updateSelectInput(session, inputId = "filter.prim", choices = sort(data[[1]][,1]), selected = stillSelected.prim)
    if(length(data) == 2) {
      updateSelectInput(session, inputId = "filter.sec", choices = sort(data[[2]][,1]), selected = stillSelected.sec)
    }

    values$data <- sub
  })

  output$table_in_primary <- renderRHandsontable({
    ## remove existing notifications
    removeNotification(id = "notification")

    rhandsontable(values$data_primary,
                  height = 300,
                  colHeaders = c("Dose", "Error"),
                  rowHeaders = NULL)
  })

  observeEvent(input$table_in_primary, {
    res <- RLumShiny:::rhandsontable_workaround(input$table_in_primary)
    if (!is.null(res))
      values$data_primary <- res
  })

  output$table_in_secondary <- renderRHandsontable({
    ## remove existing notifications
    removeNotification(id = "notification")

    rhandsontable(values$data_secondary,
                  height = 300,
                  colHeaders = c("Dose", "Error"),
                  rowHeaders = NULL)
  })

  observeEvent(input$table_in_secondary, {
    res <- RLumShiny:::rhandsontable_workaround(input$table_in_secondary)
    if (!is.null(res))
      values$data_secondary <- res
  })

  # check and read in file (DATA SET 1)
  observeEvent(input$file1, {
    inFile<- input$file1

    if(is.null(inFile))
      return(NULL) # if no file was uploaded return NULL

    values$data_primary <- fread(file = inFile$datapath, data.table = FALSE) # inFile[1] contains filepath
    if (ncol(values$data_primary) > 2)
      values$data_primary <- values$data_primary[, 1:2]
  })

  # check and read in file (DATA SET 2)
  observeEvent(input$file2, {
    inFile<- input$file2

    if(is.null(inFile))
      return(NULL) # if no file was uploaded return NULL

    values$data_secondary <- fread(file = inFile$datapath, data.table = FALSE) # inFile[1] contains filepath
    if (ncol(values$data_secondary) > 2)
      values$data_secondary <- values$data_secondary[, 1:2]
  })

  # dynamically inject sliderInput for x-axis range
  output$xlim<- renderUI({

    data<- values$data

    if(input$logz == TRUE) {
      sd<- unlist(lapply(data, function(x) x[,2]/x[,1]))
    } else {
      sd<- unlist(lapply(data, function(x) x[,2]))
    }
    prec <- max(1 / sd)
    sliderInput(inputId = "xlim", sep="",
                label = "Range x-axis",
                min = 0,
                max = round(prec * 2, 3),
                value = prec * 1.05)
  })## EndOf::renderUI()

  # dynamically inject sliderInput for z-axis range
  output$zlim<- renderUI({
    data<- unlist(lapply(values$data, function(x) x[,1]))
    min<- min(data)
    max<- max(data)
    if (input$logz)
      min <- max(min, 0.01)
    sliderInput(inputId = "zlim",  sep="",
                label = "Range z-axis",
                min = min*0.25,
                max = round(max*1.75, 3),
                value = c(min*0.8, max*1.2))
  })## EndOf::renderUI()


  output$ylim<- renderUI({
    ylim <- round(plot_AbanicoPlot(values$data, output = TRUE)$ylim, 3)
    sliderInput(inputId = "ylim",  sep="",
                label = "Range y-axis",
                min = ylim[1]*4,
                max = ylim[2]*4,
                value = c(ylim[1], ylim[2]),
                step = 0.01)
  })


  # dynamically inject sliderInput for KDE bandwidth
  output$bw<- renderUI({
    data<- unlist(lapply(values$data, function(x) x[,1]))
    if (input$logz && all(data > 0)) {
      data<- log(data)
      min<- 0.001
      value<- bw.nrd0(data)*2
      max<- value*2
    } else {
      value<- bw.nrd0(data)
      min<- value/4
      max<- value*4
    }
    sliderInput(inputId = "bw",  sep="",
                label = "KDE bandwidth",
                min = round(min, 3),
                max = round(max, 3),
                value = value)
  })## EndOf::renderUI()


  output$centralityNumeric<- renderUI({

    data <- values$data

    numericInput(inputId = "centralityNumeric",
                 label = "Value",
                 value = round(mean(data[[1]][,1]), 2),
                 step = 0.01)
  })

  observe({
    # refresh plot on button press
    input$refresh

    # make sure that input panels are registered on non-active tabs.
    # by default tabs are suspended and input variables are hence
    # not available
    outputOptions(x = output, name = "bw", suspendWhenHidden = FALSE)
    outputOptions(x = output, name = "zlim", suspendWhenHidden = FALSE)
    outputOptions(x = output, name = "xlim", suspendWhenHidden = FALSE)
    outputOptions(x = output, name = "ylim", suspendWhenHidden = FALSE)
    outputOptions(x = output, name = "centralityNumeric", suspendWhenHidden = FALSE)

    # if custom datapoint color get RGB code from separate input panel
    color <- ifelse(input$color == "custom", input$jscol1, input$color)

    if(!all(is.na(unlist(values$data_secondary)))) {
      # if custom datapoint color get RGB code from separate input panel
      if(input$color2 == "custom") {
        if(input$jscol2 == "") {
          color2<- "black"
        } else {
          color2<- input$jscol2
        }
      } else {
        color2<- input$color2
      }
    } else {
      color2<- "black" #adjustcolor("white", alpha.f = 0)
    }

    # if custom datapoint style get char from separate input panel
    pch <- ifelse(input$pch == "custom", input$custompch, as.integer(input$pch))

    # if custom datapoint style get char from separate input panel
    pch2 <- ifelse(input$pch2 == "custom", input$custompch2, as.integer(input$pch2))

    # create numeric vector of lines
    line <- sapply(1:8, function(x) input[[paste0("line", x)]])

    # create char vector of line colors
    line.col <- sapply(1:8, function(x) input[[paste0("colline", x)]])

    # create char vector of line labels
    line.label <- sapply(1:8, function(x) input[[paste0("labline", x)]])

    # create integer vector of line types
    line.lty <- sapply(1:8, function(x) as.numeric(input[[paste0("linelty", x)]]))

    # if custom polygon color get RGB from separate input panel or "none"
    polygon.col <- ifelse(input$polygon == "custom",
                          adjustcolor(col = input$rgbPolygon, alpha.f = input$alpha.polygon/100),
                          ifelse(input$polygon == "none",
                                 input$polygon,
                                 adjustcolor(col = input$polygon, alpha.f = input$alpha.polygon/100)))

    # if custom polygon color get RGB from separate input panel or "none"
    # (secondary data set)
    polygon.col2 <- ifelse(input$polygon2 == "custom",
                           adjustcolor(col = input$rgbPolygon2, alpha.f = input$alpha.polygon/100),
                           ifelse(input$polygon2 == "none",
                                  input$polygon2,
                                  adjustcolor(col = input$polygon2, alpha.f = input$alpha.polygon/100)))


    # if custom bar color get RGB from separate input panel or "none"
    bar.col <- ifelse(input$bar == "custom",
                      adjustcolor(col = input$rgbBar, alpha.f = input$alpha.bar/100),
                      ifelse(input$bar == "none",
                             "transparent",
                             adjustcolor(col = input$bar, alpha.f = input$alpha.bar/100)))


    # if custom bar color get RGB from separate input panel or "none"
    # SECONDARY DATA SET
    bar.col2 <- ifelse(input$bar2 == "custom",
                       adjustcolor(col = input$rgbBar2, alpha.f = input$alpha.bar/100),
                       ifelse(input$bar2 == "none",
                              "transparent",
                              adjustcolor(col = input$bar2, alpha.f = input$alpha.bar/100)))

    # if custom grid color get RGB from separate input panel or "none"
    grid.col <- ifelse(input$grid == "custom",
                       adjustcolor(col = input$rgbGrid, alpha.f = input$alpha.grid/100),
                       ifelse(input$grid == "none",
                              input$grid,
                              adjustcolor(col = input$grid, alpha.f = input$alpha.grid/100)))

    # workaround: if no legend wanted set label to NA and hide
    # symbol on coordinates -999, -999
    if(input$showlegend == FALSE) {
      legend <- NULL
      legend.pos<- c(-999,-999)
    } else {
      if(!all(is.na(unlist(values$data_secondary))))
      {
        legend<- c(input$legendname, input$legendname2)
      } else {
        legend<- c(input$legendname)
      }
      legend.pos <- input$legend.pos
    }

    # TODO: arg 'bar' handling (custom values, 1 or 2 bars)
    if (input$customSigBar) {
      if (!input$addBar)
        bar <- input$sigmabar1
      if (input$addBar)
        bar <- c(input$sigmabar1, input$sigmabar2)
    } else {
      bar <- TRUE
    }


    # check whether a keyword or a numeric value is used for
    # centrality
    centrality <- ifelse(input$centrality == "custom", input$centralityNumeric, input$centrality)

    # check whether predefined or custom dispersion
    dispersion<- ifelse(input$dispersion == "custom", paste("p", input$cinn, sep=""), input$dispersion)

    # save all arguments in a list
    values$args<- list(data = values$data,
                y.axis = input$yaxis,
                bw = input$bw,
                bar = bar,
                dispersion = dispersion,
                plot.ratio = input$p.ratio,
                z.0 = centrality,
                log.z = input$logz,
                summary = if (input$summary) input$stats else "",
                summary.pos = input$sumpos,
                summary.method = input$summary.method,
                col = c(color,color2),
                pch = c(pch,pch2),
                zlab = input$zlab,
                main = input$main,
                zlim = as.numeric(input$zlim),
                cex = input$cex,
                mtext = input$mtext,
                stats = input$statlabels,
                error.bars = input$errorbars,
                line = line,
                line.col = line.col,
                line.label = line.label,
                line.lty = line.lty,
                polygon.col = c(polygon.col,polygon.col2),
                bar.col = c(bar.col, bar.col2),
                grid.col = grid.col,
                legend = legend,
                legend.pos = legend.pos,
                na.rm = TRUE,
                lwd = c(input$lwd, input$lwd2),
                xlab = c(input$xlab1, input$xlab2),
                ylab = input$ylab,
                lty = c(as.integer(input$lty), as.integer(input$lty2)),
                xlim = c(0, as.numeric(input$xlim)),
                ylim = as.numeric(input$ylim),
                rug = input$rug,
                layout = input$layout,
                rotate = input$rotate,
                boxplot = input$boxplot,
                kde = input$kde,
                hist = input$histogram,
                dots = input$dots,
                frame = as.integer(input$frame))
  })

  # render Abanico Plot
  output$main_plot <- renderPlot({

    # validate(need()) makes sure that all data are available to
    # renderUI({}) before plotting and will wait until there
    validate(need(expr = req(input$bw), message = ''),
             need(expr = input$zlim, message = ''),
             need(expr = input$ylim, message = ''),
             need(expr = input$centralityNumeric, message = 'Waiting for data... Please wait!'))

    # plot Abanico Plot
    RLumShiny:::tryNotify(do.call(what = plot_AbanicoPlot, args = values$args))
  })##EndOf::renderPlot({})

  observe({
    # nested renderText({}) for code output on "R plot code" tab
    code.output <- callModule(RLumShiny:::printCode, "printCode",
                              n_inputs = ifelse(!all(is.na(unlist(values$data_secondary))), 2, 1),
                              list(name = "plot_AbanicoPlot",
                                   arg1 = "data",
                                   args = values$args))

    output$plotCode<- renderText({
      code.output
    })##EndOf::renderText({})

    callModule(RLumShiny:::exportCodeHandler, "export", code = code.output)
    callModule(RLumShiny:::exportPlotHandler, "export", fun = "plot_AbanicoPlot", args = values$args)
  })

  Selected<- reactive({
    input$refresh
  })

  # renderTable() that prints the data to the second tab
  output$dataset<- DT::renderDT(
    options = list(pageLength = 10, autoWidth = FALSE),
{
  data <- values$data
  colnames(data[[1]])<- c("De","De error")
  data[[1]]

})##EndOf::renterTable()

  # renderTable() that prints the secondary data to the second tab
  output$dataset2<- DT::renderDT(
    options = list(pageLength = 10, autoWidth = FALSE),
{
  if(!all(is.na(unlist(values$data_secondary)))) {
    data <- values$data
    colnames(data[[2]])<- c("De","De error")
    data[[2]]
  }
})##EndOf::renterTable()

  # renderTable() to print the results of the
  # central age model (CAM)
  output$CAM<- DT::renderDT(
    options = list(pageLength = 10, autoWidth = FALSE),
    {
      data<- values$data
      t<- as.data.frame(matrix(nrow = length(data), ncol = 7))
      colnames(t)<- c("Data set","n", "log data", "Central dose", "SE abs.", "OD (%)", "OD error (%)")
      res<- lapply(data, function(x) { calc_CentralDose(x, verbose = FALSE, plot = FALSE) })
      for(i in 1:length(res)) {
        t[i,1]<- ifelse(i==1,"primary","secondary")
        t[i,2]<- length(res[[i]]@data$data[,1])
        t[i,3]<- res[[i]]@data$args$log
        t[i,4:7]<- round(res[[i]]@data$summary[1:4],2)
      }
      t
    })##EndOf::renterTable()

}##EndOf::shinyServer(function(input, output)
