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# Copyright 2021 Province of British Columbia
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#' Percent Exposure
#'
#' Calculates average proportion exposed based on log-normal distribution of concentrations.
#'
#' @inheritParams params
#' @param meanlog The mean of the exposure concentrations on the log scale.
#' @param sdlog The standard deviation of the exposure concentrations on the log scale.
#' @param nboot The number of samples to use to calculate the exposure.
#' @return The proportion exposed.
#' @export
#' @examples
#' fits <- ssd_fit_dists(ssddata::ccme_boron, dists = "lnorm")
#' set.seed(10)
#' ssd_exposure(fits)
#' ssd_exposure(fits, meanlog = 1)
#' ssd_exposure(fits, meanlog = 1, sdlog = 1)
ssd_exposure <- function(x, meanlog = 0, sdlog = 1, nboot = 1000) {
chk_number(meanlog)
chk_number(sdlog)
chk_whole_number(nboot)
chk_gt(nboot)
conc <- ssd_rlnorm(nboot, meanlog = meanlog, sdlog = sdlog)
mean(ssd_hp(x, conc)$est) / 100
}
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