context("Check that getParamsDirs behaves as expected")

test_that("on input of sufficient size, beta is estimated accurately enough", {
	n = 100000
	d = 2
	K = 2
	Pr = c(0.5, 0.5)

	betas_ref = array( c(1,0,0,1 , 1,-2,3,1), dim=c(2,2,2) )
	for (i in 1:(dim(betas_ref)[3]))
	{
		beta_ref = betas_ref[,,i]
		#all parameters are supposed to be of norm 1: thus, normalize beta_ref
		norm2 = sqrt(colSums(beta_ref^2))
		beta_ref = beta_ref / norm2[col(beta_ref)]

		io = generateSampleIO(n, d, K, Pr, beta_ref)
		beta = getParamsDirs(io$X, io$Y, K)
		betas = .labelSwitchingAlign(
			array( c(beta_ref,beta), dim=c(d,K,2) ), compare_to="first", ls_mode="exact")

		#Some traces: 0 is not well estimated, but others are OK
		cat("\n\nReference parameter matrix:\n")
		print(beta_ref)
		cat("Estimated parameter matrix:\n")
		print(betas[,,2])
		cat("Difference norm (Matrix norm ||.||_1, max. abs. sum on a column)\n")
		diff_norm = norm(beta_ref - betas[,,2])
		cat(diff_norm,"\n")

		#NOTE: 0.5 is loose threshold, but values around 0.3 are expected...
		expect_that( diff_norm, is_less_than(0.5) )
	}
})
dateIndexToInteger = function(index, data)
{
	index = index[1]
	if (is.numeric(index))
		index = as.integer(index)
	if (is.integer(index))
		return (index)
	if (inherits(index, "Date") || is.character(index))
	{
		tryCatch(dt <- as.POSIXct(index), error=function(e) stop("Unrecognized index format"))
		#TODO: tz arg to difftime ?
		integerIndex <- round( (as.numeric( difftime(dt, data$getTime(1)) ))[1] ) + 1
		if (integerIndex > 0 && integerIndex <= data$getSize())
		{
			#WARNING: if series start at date >0h, result must be shifted
			date1 = as.POSIXlt(data$getTime(1)[1])
			date2 = as.POSIXlt(data$getTime(2)[1])
			shift = (date1$year==date2$year && date1$mon==date2$mon && date1$mday==date2$mday)
			return (integerIndex + ifelse(shift,1,0))
		}
		stop("Date outside data range")
	}
	stop("Unrecognized index format")
}

#' @title integerIndexToDate
#'
#' @description Transform an integer index to date index (relative to data)
#'
#' @param index Date (or integer) index
#' @param data Object of class \code{Data}
#'
#' @export
integerIndexToDate = function(index, data)