#'Report the accumulative numbers of a rank of a given taxa overtime
#'
#' @param taxa A string.
#' @param rank A string.
#' @return accumulation curve of \code{rank} of a \code{taxa}
#' @import data.table
#' @import ggplot2
#'@examples
#'\dontrun{
#'taxaaccum("Animalia", "Phylum")
#'}
#'@export
taxaaccum <- function(taxa, rank) {
df <- subset(data_m, Kingdoms == taxa | Phyla == taxa | Classes == taxa | Orders == taxa | Families == taxa | Genera == taxa)
dt = as.data.table(unique(df))
setkey(dt, "year")
if (rank == "Phylum") {
dt[, id := as.numeric(factor(Phyla, levels = unique(Phyla)))]
ranklabel = "phyla"
} else if (rank == "Class") {
dt[, id := as.numeric(factor(Classes, levels = unique(Classes)))]
ranklabel = "classes"
} else if (rank == "Order") {
dt[, id := as.numeric(factor(Orders, levels = unique(Orders)))]
ranklabel = "orders"
} else if (rank == "Family") {
dt[, id := as.numeric(factor(Families, levels = unique(Families)))]
ranklabel = "families"
} else if (rank == "Genus") {
dt[, id := as.numeric(factor(Genera, levels = unique(Genera)))]
ranklabel = "genera"
} else if (rank == "Species") {
dt[, id := as.numeric(factor(AphiaIDs, levels = unique(AphiaIDs)))]
ranklabel = "species"
}
setkey(dt, "year", "id")
dt.out <- dt[J(unique(year)), mult = "last"]#[, Phylum := NULL]
dt.out[, id := cummax(id)]
numtaxa <- cummax(as.numeric(factor(dt$id)))
taxa_dt <- aggregate(numtaxa, list(year = dt$year), max )
colnames(taxa_dt) <- c("year", "taxacount")
minx <- min(as.vector(taxa_dt$year))
maxx <- max(as.vector(taxa_dt$year))
ylab = paste("Number of", ranklabel, sep = " ")
p <- ggplot(taxa_dt, aes(x = year, y = taxacount, colour = "#FF9999")) + geom_point(colour = "cornflowerblue")
p <- p + labs(x = "Year", y = ylab) + ggtitle(taxa) + scale_x_discrete(breaks = c(seq(minx, maxx, 25))) + theme(legend.position = "none", axis.text.x = element_text(angle = 60, hjust = 1), axis.text.y = element_text(angle = 60, hjust = 1), axis.title.y = element_text(margin = margin(t = 0, r = 20, b = 0, l = 0)))
p
}
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