#!/usr/bin/env bash
#
# Summary: Generate a binary package name for the current platform
#
# Usage: pyenv binary package-name <version>
#
#   Prints a package name containing the Python version, platform name,
#   platform version and architecture.
#
set -e
[ -n "$PYENV_DEBUG" ] && set -x

if [ "$1" = "--complete" ]; then
  exec pyenv-install --list --bare
fi

if [ $# -ne 1 ]; then
  pyenv-help --usage binary-package-name >&2
  exit 1
fi

version="$1"

case "$version" in
*/* | .. | . | *[[:cntrl:]]* )
  echo "pyenv-binary: invalid version name \`${version}'" >&2
  exit 1
  ;;
esac

os="$(uname -s)"
arch="$(uname -m)"
distro=""
distro_version=""

case "$os" in
Linux )
  if type -p lsb_release >/dev/null; then
    distro="$(lsb_release -si)"
    distro_version="$(lsb_release -sr)"
  elif [ -r /etc/os-release ]; then
    distro="$(. /etc/os-release && printf '%s' "${ID:-}")"
    distro_version="$(. /etc/os-release && printf '%s' "${VERSION_ID:-}")"
  fi
  ;;
Darwin )
  distro="macos"
  distro_version="$(sw_vers -productVersion)"
  ;;
* )
  distro="$os"
  distro_version="$(uname -r)"
  ;;
esac

slug() {
  printf '%s' "$1" |
    tr '[:upper:] ' '[:lower:]-' |
    tr -cd 'a-z0-9._-'
}

distro="$(slug "$distro")"
distro_version="$(slug "$distro_version")"
arch="$(slug "$arch")"

if [ -z "$distro" ] || [ -z "$distro_version" ] || [ -z "$arch" ]; then
  echo "pyenv-binary: could not determine the package platform" >&2
  exit 1
fi

printf '%s-%s-%s-%s\n' "$version" "$distro" "$distro_version" "$arch"