.bigbang_abort <- function(class, message, ...) {
  condition <- base::structure(
    base::c(base::list(message = message, call = NULL), base::list(...)),
    class = base::c(class, "bigbang_error", "error", "condition")
  )
  base::stop(condition)
}

resolve_upgrade_policy <- function(force, upgrade, upgrade_missing) {
  if (!base::is.logical(force) || base::length(force) != 1L || base::is.na(force)) {
    .bigbang_abort(
      "bigbang_error_install_policy",
      .meta_tr("'force' must be TRUE or FALSE")
    )
  }
    upgrade <- base::match.arg(upgrade, base::c("newer", "always", "never"))
  if (base::isTRUE(force)) {
    if (!base::isTRUE(upgrade_missing) && !base::identical(upgrade, "always")) {
      .bigbang_abort(
        "bigbang_error_install_policy",
        .meta_tr(
          "'force = TRUE' conflicts with an explicit upgrade policy other than 'always'"
        )
      )
    }
    upgrade <- "always"
  }
  upgrade
}