#' Data
#'
#' Data encapsulation
#'
#' @field data List of
#' \itemize{
#'   \item time: vector of times
#'   \item serie: centered series
#'   \item level: corresponding levels
#'   \item exo: exogenous variables
#'   \item exo_hat: predicted exogenous variables
#' }
#'
#' @docType class
#' @importFrom R6 R6Class
#'
#' @export
Data = R6::R6Class("Data",
	private = list(
		.data = list()
	),
	public = list(
		getSize = function()
			getSizeData(private)
		,
		getStdHorizon = function()
			getStdHorizonData(private)
		,
		append = function(new_time, new_centered_serie, new_level, new_exo, new_exo_hat)
			appendData(private, new_time, new_centered_serie, new_level, new_exo, new_exo_hat)
		,
		getTime = function(index)
			getTimeData(self, private, index)
		,
		getCenteredSerie = function(index)
			getCenteredSerieData(self, private, index)
		,
		getLevel = function(index)
			getLevelData(self, private, index)
		,
		getSerie = function(index)
			getSerieData(self, private, index)
		,
		getExo = function(index)
			getExoData(self, private, index)
		,
		getExoHat = function(index)
			getExoHatData(self, private, index)
	)
)

#' Number of series in the dataset
#'
#' @param private List of private members in current object
getSizeData = function(private)
	length(private$.data)

#' 'Standard' horizon, from t+1 to midnight
#'
#' @inheritParams getSizeData
getStdHorizonData = function(private)
	24 - as.POSIXlt( private$.data[[1]]$time[1] )$hour + 1

#' Acquire a new vector of lists (time, centered_serie, level, exo, exo_hat)
#'
#' @inheritParams getSizeData
#' @param new_time Time
#' @param new_centered_serie Centered serie
#' @param new_level Level
#' @param new_exo Exogneous variables
#' @param new_exo_hat Predicted exogenous variables
appendData = function(private, new_time, new_centered_serie, new_level, new_exo, new_exo_hat)
{
	private$.data[[length(private$.data)+1]] <- list("time"=new_time,
		"centered_serie"=new_centered_serie,"level"=new_level,"exo"=new_exo,"exo_hat"=new_exo_hat)
}

#' Time values at specified index
#'
#' @inheritParams getSizeData
#' @param index Return value at this index
getTimeData = function(o, private, index)
{
	index = dateIndexToInteger(index, o)
	private$.data[[index]]$time
}

#' Centered serie values at specified index
#'
#' @inheritParams getTimeData
getCenteredSerieData = function(o, private, index)
{
	index = dateIndexToInteger(index, o)
	private$.data[[index]]$centered_serie
}

#' Level of the serie at specified index
#'
#' @inheritParams getTimeData
getLevelData = function(o, private, index)
{
	index = dateIndexToInteger(index, o)
	private$.data[[index]]$level
}

#' Serie values (centered+level) at specified index
#'
#' @inheritParams getTimeData
getSerieData = function(o, private, index)
{
	index = dateIndexToInteger(index, o)
	private$.data[[index]]$centered_serie + data[[index]]$level
}

#' Exogenous measures at specified index
#'
#' @inheritParams getTimeData
getExoData = function(o, private, index)
{
	index = dateIndexToInteger(index, o)
	private$.data[[index]]$exo
}

#' Exogeous predictions at specified index
#'
#' @inheritParams getTimeData
getExoHatData = function(o, private, index)
{
	index = dateIndexToInteger(index, o)
	private$.data[[index]]$exo_hat
}