## Setup R error handling to go to stderr
options( show.error.messages=F,
         error = function () { cat( geterrmessage(), file=stderr() ); q( "no", 1, F ) } )
options(warn = -1)
library(RColorBrewer)
library(lattice)
library(latticeExtra)
library(grid)
library(gridExtra)
library(optparse)

option_list <- list(
  make_option(c("-f", "--first_dataframe"), type="character", help="path to first dataframe"),
  make_option("--first_plot_method", type = "character", help="How additional data should be plotted"),
  make_option("--output_pdf", type = "character", help="path to the pdf file with plots")
)

parser <- OptionParser(usage = "%prog [options] file", option_list = option_list)
args = parse_args(parser)

# data frames implementation

## first table
Table = read.delim(args$first_dataframe, header=T, row.names=NULL)
colnames(Table)[1] <- "Dataset"
dropcol <- c("Strandness", "z.score") # not used by this Rscript and is dropped for backward compatibility
Table <- Table[,!(names(Table) %in% dropcol)]
if (args$first_plot_method == "Counts" | args$first_plot_method == "Size") {
  Table <- within(Table, Counts[Polarity=="R"] <- (Counts[Polarity=="R"]*-1))
}
n_samples=length(unique(Table$Dataset))
samples = unique(Table$Dataset)
genes=unique(Table$Chromosome)
per_gene_readmap=lapply(genes, function(x) subset(Table, Chromosome==x))
per_gene_limit=lapply(genes, function(x) c(1, unique(subset(Table, Chromosome==x)$Chrom_length)) )
n_genes=length(per_gene_readmap)

## functions
plot_unit = function(df, method=args$first_plot_method, ...) {
    p = xyplot(Counts~Coordinate|factor(Dataset, levels=unique(Dataset))+factor(Chromosome, levels=unique(Chromosome)),
               data=df,
               type='h',
               lwd=1.5,
               scales= list(relation="free", x=list(rot=0, cex=0.7, axs="i", tck=0.5), y=list(tick.number=4, rot=90, cex=0.7)),
               xlab=NULL, main=NULL, ylab=NULL,
               as.table=T,
               origin = 0,
               horizontal=FALSE,
               group=Polarity,
               col=c("red","blue"),
               par.strip.text = list(cex=0.7),
               ...)
    p=combineLimits(p)
}

## function parameters
par.settings.firstplot = list(layout.heights=list(top.padding=-2, bottom.padding=-2),strip.background=list(col=c("lightblue","lightgreen")))
title_first_method = list(Counts="Read Counts", Coverage="Coverage depths", Median="Median sizes", Mean="Mean sizes", Size="Size Distributions")
legend_first_method =list(Counts="Read count", Coverage="Coverage depth", Median="Median size", Mean="Mean size", Size="Read count")
bottom_first_method =list(Counts="Coordinates (nucleotides)",Coverage="Coordinates (nucleotides)", Median="Coordinates (nucleotides)", Mean="Coordinates (nucleotides)", Size="Sizes of reads")

## Plotting Functions
single_plot <- function(...) {
  width = 8.2677 * n_samples / 2
  rows_per_page=8
  graph_heights=c(rep(40,8),10)
  pdf(file=args$output_pdf, paper="special", height=15, width=width)
  for (i in seq(1,n_genes,rows_per_page)) {
    start=i
    end=i+rows_per_page-1
    if (end>n_genes) {end=n_genes}
    if (end-start+1 < 8) {graph_heights=c(rep(c(40),end-start+1),10,rep(c(40),8-(end-start+1)))}
    first_plot.list = lapply(per_gene_readmap[start:end], function(x) update(useOuterStrips(plot_unit(x, par.settings=par.settings.firstplot),strip.left=strip.custom(par.strip.text = list(cex=0.5)))))
    plot.list=rbind(first_plot.list)
    args_list=c(plot.list, list( nrow=rows_per_page+1, ncol=1, heights=unit(graph_heights, rep("mm", 9)),
                                 top=textGrob("Cluster Read Counts (Peaks in middle of clusters)", gp=gpar(cex=1), vjust=0, just="top"),
                                 left=textGrob("Read Counts", gp=gpar(cex=1), vjust=0, hjust=0, x=1, y=(-0.41/7)*(end-start-(6.23/0.41)), rot=90),
                                 sub=textGrob("Coordinates (nucleotides)", gp=gpar(cex=1), just="bottom", vjust=2)
    )
    )
    do.call(grid.arrange, args_list)
  }
  devname=dev.off()
}

# main
single_plot()