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#' Generate one or more random parent/child pairs from a given set of allele
#' frequencies
#'
#' Generates one or more pairs random parent/child pairs from a given set of
#' allele frequencies.
#'
#' The alleles are simply integers rather than the STR repeat numbers. This
#' speeds up computation immensely when calculating any of the LRs or IBS.
#'
#' @param Freqs A list containing two lists labelled loci and freqs. The second
#' list is a list of vectors containing the allele frequencies of each allele
#' at each locus in the multiplex.
#' @param BlockSize The number of pairs of profiles to generate
#' @return A list of length \code{BlockSize}. Each element of the list has a
#' sublist containing two profiles called \code{parent} and \code{child}
#' @author James M. Curran
#' @seealso randomSibPairs, randomProfilePairs
#' @examples
#'
#' data(fbiCaucs)
#' P = randomPCPairs(fbiCaucs)
#' P$parent
#' P$child
#'
#' @export randomPCPairs
randomPCPairs = function(Freqs, BlockSize = 1){
nLoci = length(Freqs$loci)
Profile = vector(mode = "list", length = BlockSize)
Parent = .randomProfiles(Freqs$freqs, BlockSize)
Child = randomChildren(Parent, Freqs$freqs, BlockSize)
for(b in 1:BlockSize){
i1 = (b - 1) * 2 * nLoci + 1
i2 = b * 2 * nLoci
Profile[[b]] = vector(mode = "list", length = 2)
names(Profile[[b]]) = c("parent", "child")
Profile[[b]]$parent = Parent[i1:i2]
class(Profile[[b]]$parent) = "profile"
Profile[[b]]$child = Child[i1:i2]
class(Profile[[b]]$child) = "profile"
}
if(BlockSize == 1){
return(Profile[[1]])
}else{
return(Profile)
}
}
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