#!/usr/bin/env bash
# Copyright (C) 2013, 2017 Luke Shumaker <lukeshu@parabola.nu>
# Copyright (C) 2020 bill-auger <bill-auger@programmer.net>
#
# License: GNU GPLv3+
#
# This file is part of Parabola.
#
# Parabola is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Parabola is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Parabola.  If not, see <http://www.gnu.org/licenses/>.


source "$(librelib blacklist)"
source "$(librelib messages)"


usage() {
  print "Usage: %s [OPTIONS] STATUS" "${0##*/}"
  print 'Summarizes a freedom-status code from `pkgbuild-check-nonfree`'
  echo
  prose 'It thresholds the issues it finds, only failing for error-level
         issues, and ignoring warnings.  Unless `-q` is specified, it also
         prints a summary of the issues it found.'
  echo
  print 'Options:'
  flag '-q' 'Be quiet'
  flag '-h' 'Show this message'
  flag '-w' 'Treat blacklist entries as warnings'
}

main() {
  local quiet=false
  local warn=false
  while getopts 'qhw' arg; do
    case "$arg" in
      q) quiet=true;;
      h) usage; exit $EXIT_SUCCESS;;
      w) warn=true;;
      *) usage >&2; exit $EXIT_INVALIDARGUMENT;;
    esac
  done
  shift $((OPTIND - 1))
  if [[ $# -ne 1 ]]; then
    usage >&2
    exit $EXIT_INVALIDARGUMENT
  fi
  if ! [[ $1 =~ ^[0-9]+$ ]]; then
    error 'STATUS must be an integer'
    usage >&2
    exit $EXIT_INVALIDARGUMENT
  fi

  if $quiet; then
    error() { :; }
    warning() { :; }
  fi

  report "$1"
}

report() {
  [[ $# == 1 ]] || panic 'malformed call to parse'

  declare -i detected_code=$1
  declare -i ret=$EXIT_SUCCESS
  declare -i freedom_status_code

  for freedom_status_code in 1 2 4 8 16 32; do
    if [[ $((detected_code & freedom_status_code)) -gt 0 ]]; then
      case $freedom_status_code in
        $_E_ERROR)
          # could be anything, assume the worst
          error "There was an error processing the PKGBUILD"
          ret=$EXIT_FAILURE;;
        $_E_LIC_UNKNOWN)
          warning "This PKGBUILD has an unknown license";;
        $_E_LIC_NOGPL)
          warning "This PKGBUILD has a GPL-incompatible license";;
        $_E_LIC_NONFREE)
          error "This PKGBUILD has a non-free license"
          ret=$EXIT_FAILURE;;
        $_E_DEP_NONFREE)
          $warn && warning "This PKGBUILD depends on blacklisted package(s)" || \
                   error   "This PKGBUILD depends on blacklisted package(s)"
          $warn || ret=$EXIT_FAILURE;;
        $_E_PKG_NONFREE)
          $warn && warning "This PKGBUILD is for a blacklisted package" || \
                   error   "This PKGBUILD is for a blacklisted package"
          $warn || ret=$EXIT_FAILURE;;
      esac
    fi
  done

  return $ret
}


main "$@"