#' Color scale constructor for REACH or AGORA colors
#'
#' @param initiative Either "reach" or "agora
#' @param palette Character name of palette in drsimonj_palettes
#' @param discrete Boolean indicating whether color aesthetic is discrete or not
#' @param reverse Boolean indicating whether the palette should be reversed
#' @param ... Additional arguments passed to discrete_scale() or
#'            scale_color_gradientn(), used respectively when discrete is TRUE or FALSE
#' @return A color scale for ggplot
#'
#' @export
scale_color  <- function(initiative = "reach", palette = "main", discrete = TRUE, reverse = FALSE, ...) {

  if (initiative == "reach") {
    pal <- pal_reach(
      palette = palette,
      reverse = reverse,
      color_ramp_palette = TRUE,
      show_palettes = FALSE
      )
  } else if (initiative == "agora") {
    pal <- pal_agora(
      palette = palette,
      reverse = reverse,
      color_ramp_palette = TRUE,
      show_palettes = FALSE
    )
  } else {
    rlang::abort(c("Wrong initiative parameter input", "*" = paste0(initiative, "is not an option"), "i" = "Parameter 'initiative' should be one of 'reach' or 'agora'"))
  }

  if (discrete) {
    ggplot2::discrete_scale("colour", paste0(initiative, "_", palette), palette = pal, ...)
  } else {
    ggplot2::scale_color_gradientn(colours = pal(256), ...)
  }
}



#' Fill scale constructor for REACH or AGORA colors
#'
#' @param initiative Either "reach" or "agora
#' @param palette Character name of palette in drsimonj_palettes
#' @param discrete Boolean indicating whether color aesthetic is discrete or not
#' @param reverse Boolean indicating whether the palette should be reversed
#' @param ... Additional arguments passed to discrete_scale() or
#'            scale_fill_gradientn(), used respectively when discrete is TRUE or FALSE
#' @return A fill scale for ggplot
#'
#' @export
scale_fill  <- function(initiative = "reach", palette = "main", discrete = TRUE, reverse = FALSE, ...) {

  if (initiative == "reach") {
    pal <- pal_reach(
      palette = palette,
      reverse = reverse,
      color_ramp_palette = TRUE,
      show_palettes = FALSE
    )
  } else if (initiative == "agora") {
    pal <- pal_agora(
      palette = palette,
      reverse = reverse,
      color_ramp_palette = TRUE,
      show_palettes = FALSE
    )
  } else {
    rlang::abort(c("Wrong initiative parameter input", "*" = paste0(initiative, "is not an option"), "i" = "Parameter 'initiative' should be one of 'reach' or 'agora'"))
  }

  if (discrete) {
    ggplot2::discrete_scale("fill", paste0(initiative, "_", palette), palette = pal, ...)
  } else {
    ggplot2::scale_fill_gradientn(colours = pal(256), ...)
  }
}