#!/usr/bin/env bash
#
# Summary: Install Python build prerequisites on Debian-based systems
#
# Usage: pyenv install-prerequisites
#
set -e
[ -n "$PYENV_DEBUG" ] && set -x

if [ "$1" = "--complete" ]; then
  exit
fi

usage() {
  pyenv-help install-prerequisites 2>/dev/null
  [ -z "$1" ] || exit "$1"
}

if [ "$1" = "-h" ] || [ "$1" = "--help" ]; then
  usage 0
fi

[ "$#" -eq 0 ] || usage 1 >&2

if ! command -v apt-get >/dev/null; then
  echo "pyenv: installing build prerequisites is not supported on this system" >&2
  exit 1
fi

prerequisites=(
  make build-essential libssl-dev zlib1g-dev libbz2-dev libreadline-dev
  libsqlite3-dev curl git llvm libncurses5-dev libncursesw5-dev xz-utils
  tk-dev libxml2-dev libxmlsec1-dev libffi-dev liblzma-dev libzstd-dev
)

if [ "$(id -u)" -eq 0 ]; then
  apt_get=(apt-get)
elif command -v sudo >/dev/null; then
  apt_get=(sudo apt-get)
else
  echo "pyenv: sudo is required to install build prerequisites" >&2
  exit 1
fi

"${apt_get[@]}" update -q
"${apt_get[@]}" install -yq "${prerequisites[@]}"