#!/bin/bash

usage() {
  >&2 echo 'Verwendung: '
  >&2 echo "  $0"' [-f|--force] [-j|--jobs=${jobs}]'
  >&2 echo '    -f|--force:  prüfe Versionen unhabhängig von Zeit der letzten Prüfung'
  >&2 echo '    -j|--jobs:   Anzahl parallel auszufuehrender Anfragen'
  >&2 echo '    -m:          maschinenlesbare Ausgabe erzeugen'
  exit 1
}

me="$(readlink -f $0)"
cd $(dirname "${me}")
versionenDatei="/var/cache/$(basename "$(dirname "${me}")").lastVersions"
jobs=0
maschinenlesbar=false
[ ! -r "${versionenDatei}" ] && force=true || force=false

eval set -- "$(getopt -o fj:m --long force,jobs: -n "$(basename "$0")" -- "$@" || echo "usage")"
args=("$@")
optArgs=()

while true
do
  case $1 in
    -f|--force)
      force=true
      optArgs[${#optArgs[@]}]="-f"
    ;;
    -j|--jobs)
      shift
      jobs="$1"
      optArgs[${#optArgs[@]}]="-j"
      optArgs[${#optArgs[@]}]="$1"
    ;;
    -m)
      optArgs[${#optArgs[@]}]="-m"
      maschinenlesbar=true
    ;;
    --)
      shift
      break
    ;;
    *)
      >&2 echo "FEHLER: Verstehe Option \"$1\" doch nicht! Ich beende."
      rm -rf "${tmpDir}"
      usage
  esac
  shift
done

versionenErmitteln=${force}
! ${versionenErmitteln} && [ $(head -n1 "${versionenDatei}") -le $[$(date "+%s")-300] ] && versionenErmitteln=true
${maschinenlesbar} && versionenErmitteln=true
versionenSchreiben=${versionenErmitteln}
[ ! -w "${versionenDatei}" ] && versionenSchreiben=false
${maschinenlesbar} && versionenSchreiben=false

if [ $# -eq 0 ]
then
  if ${versionenSchreiben}
  then
    tmpFile="$(mktemp /tmp/versionen.XXXXXX)"
    date "+%s" > "${tmpFile}"
    set -o pipefail
    ${me} "${args[@]}" $(echo */PKGBUILD | tr " " "\n" | sed "s|/PKGBUILD||") | tee -a "${tmpFile}"
    err=$?
    set +o pipefail
    cat "${tmpFile}" > "${versionenDatei}"
    rm "${tmpFile}"
  elif ! ${versionenErmitteln}
  then
    cat "${versionenDatei}" | \
      ( \
        read dummy
        cat
      )
    err=$?
  else
    ${me} "${args[@]}" $(echo */PKGBUILD | tr " " "\n" | sed "s|/PKGBUILD||")
    err=$?
  fi
  exit ${err}
elif [ $# -eq 1 ] && ${versionenErmitteln}
then
  . $1/PKGBUILD

  srcKnown=false

  for src in "${source[@]}"
  do

    src="${src#*::}"

    if [ "${pkgname}" == "pgplot-for-ifeffit" ]
    then
      remVer="$(
        curl -o - "ftp://ftp.astro.caltech.edu/pub/pgplot/" 2> /dev/null | \
          grep "\spgplot[0-9.]\+\.tar\.gz -> \S\+\$" | \
          sed "s|^.*\spgplot\([0-9.]\+\)\.tar\.gz -> \S\+\$|\1|" | \
          sort -V | \
          tail -n1
      )"
    elif echo "${src}" | \
      grep -q "//bundles\.openttdcoop\.org/"
    then
      qu="$(
        echo "${src}" | \
          sed 's|^\(https\?://\([^/]\+/\)\{3\}\).*$|\1|'
      )"
      remVer="$(
        curl -o - "${qu}" 2> /dev/null | \
          tr "\"" "\n" | \
          grep '^[0-9.]\+/$' | \
          sed 's|/$||' | \
          sort -V | \
          tail -n1
      )"
    elif echo "${src}" | \
      grep -q "//opensources\.eckner\.net/"
    then
      qu=${src#*::}
      qu=${qu%-*}
      remVer=$( \
        curl -o - "$(\
          echo "${qu}" | \
            sed "s|\?dl=|?ls=|" \
          )" 2> /dev/null | \
          tr "<>" "\n\n" | \
          grep "^${pkgname}-" | \
          sed "s|^${pkgname}-||" | \
          sort -V | \
          tail -n1 \
      )
    elif echo "${src}" | \
      grep -q "//search\.m\?cpan\.org/CPAN/authors/"
    then
      quVer=$( \
        echo "${src%/*}" | \
          sed "s#//search\.m\?cpan\.org/CPAN/#//www.cpan.org/#" | \
          sed "s|^https:|http:|" | \
          sed "s|\([^/]\)\$|\1/|"
      )
      quNam=${src##*/}
      quNam=${quNam%-*}
      quEnd=$( \
        echo "${src##*-}" |
          sed "s|^v\?[0-9.]*||"
      )
      remVer=$( \
        curl -o - "${quVer}" 2> /dev/null | \
          tr "\"" "\n" | \
          grep "^${quNam}-v\?[0-9.-]*\.${quEnd}\$" | \
          sed "s|^${quNam}-v\?\(.*\)\.${quEnd}\$|\1|" | \
          sort -V | \
          tail -n1 \
      )
    elif echo "${src}" | \
      grep -q "//cpan\.org/\|//cpan\.metacpan\.org/authors/\|cpan\.org/modules/by-module/"
    then
      quVer=$( \
        echo "${src%/*}/" | \
          sed "s|//cpan\.org/|//www.cpan.org/|"
      )
      quNam=${src##*/}
      quNam=${quNam%-*}
      quEnd=$( \
        echo "${src##*-}" |
          sed "s|^v\?[0-9.]*||"
      )
      remVer=$( \
        curl -o - "${quVer}" 2> /dev/null | \
          tr "\"" "\n" | \
          grep "^${quNam}-v\?[0-9.-]*\.${quEnd}\$" | \
          sed "s|^${quNam}-v\?\(.*\)\.${quEnd}\$|\1|" | \
          sort -V | \
          tail -n1 \
      )
    elif echo "${src}" | \
      grep -q "ftp://"
    then
      quVer="${src%/*}/"
      quNam=${src##*/}
      quEnd=$( \
        echo "${quNam}" |
          sed "s|^.*v\?[0-9.]*[0-9]||" \
      )
      quNam=$( \
        echo ${quNam} | \
          sed "s|v\?[0-9.]\+.*\$||" \
      )
      tmpVer=$( \
        curl -o - "${quVer}" 2> /dev/null | \
          awk '{print $9}' | \
          grep "^${quNam}v\?[0-9.]*${quEnd}\$" | \
          sed "s|^${quNam}v\?\([0-9.]*\)${quEnd}\$|\1|" | \
          sort -V | \
          tail -n1 \
      )
      [ "${pkgname}" == "pgplot" ] && remVer="${tmpVer:0:1}.${tmpVer:1:1}.${tmpVer:2}" || remVer="${tmpVer}"
    elif echo "${src}" | \
      grep -q "//arch\.eckner\.net/"
    then
      quVer="${src%/*}"
      quVer="${quVer#*::}"
      quNam=${src##*/}
      quNam=${quNam%-*}
      quNam=${quNam%-*}
      quNam=${quNam%-*}
      quEnd=${src##*-}
      quEnd=${quEnd#*.}
      remVer=$( \
        curl -o - "${quVer}/" 2> /dev/null | \
          tr "\"" "\n" | \
          grep "^${quNam}\(-[^-]*\)\{3\}\.${quEnd}\$" | \
          sed "s|^${quNam}-\([^-]*\)\(-[^-]*\)\{2\}\.${quEnd}\$|\1|" | \
          sort -V | \
          tail -n1 \
      )
    elif echo "${src}" | \
      grep -q "//github.com/"
    then
      quVer=$(
        echo "${src#*::}" | \
          sed "s|/archive/[^/]*\$|/releases|"
      )
      quNam=/${quVer#*.com/}/tag/
      remVer=$( \
        curl -o - "${quVer}" 2> /dev/null | \
          tr "\"" "\n" | \
          grep "^${quNam}" | \
          sed "s|^${quNam}||" | \
          sort -V | \
          tail -n1 \
      )
    elif echo "${src}" | \
      grep -q "//downloads\.sourceforge\.net/sourceforge/"
    then
      quVer=$( \
        echo "${src}" | \
          sed "s|//downloads\.sourceforge\.net/sourceforge/\([^/]*\)/[^/]*\$|//sourceforge.net/projects/\1/files/\1/|" | \
          sed "s|^http:|https:|"
      )
      remVer=$( \
        curl -o - "${quVer}" 2> /dev/null | \
          tr "\"" "\n" | \
          grep "^${quVer#*sourceforge.net}[0-9.-]" | \
          sed "s|^${quVer#*sourceforge.net}\([0-9.-]\+\).*\$|\1|" | \
          sed "s|-\$||" | \
          sort -V | \
          tail -n1 \
      )
    elif echo "${src}" | \
      grep -q "//www\.hdfgroup\.org/"
    then
      quVer="${src%/*}/"
      quNam="${src##*/}"
      quNam="${quNam%-*}"
      quEnd=$( \
        echo "${src}" | \
          sed "s|^.*[0-9]||"
      )
      mainVer=${pkgname#hdf}
      remVer=$( \
        curl -o - "${quVer}" 2> /dev/null | \
          tr "\"" "\n" | \
          grep "^${quNam}-${mainVer}\.\(.*\)${quEnd}\$" | \
          sed "s|^${quNam}-${mainVer}\.\(.*\)${quEnd}\$|\1|" \
      )
    elif [ "${pkgname}" == "openttd-svn" ]
    then
      remVer=$( \
        eval $(grep "^\s*svn " $1/PKGBUILD | \
          sed "s|export|log|; s|\s*trunk\$||") | \
          grep -v "^-.* WebTranslator " | \
          grep -v "^-.* Eints:" | \
          grep "^-[^-]" -B10 -m1 | \
          grep "^r" | \
          tail -n1 | \
          sed "s|^r\([[:digit:]]\+\)\s.*\$|\1|" \
        )
    else
      continue
    fi
    srcKnown=true
    break
  done

  if ! ${srcKnown}
  then
    echo "$1: Unknown src: '${source[@]}'"
    exit 1
  fi

  if ${maschinenlesbar}
  then
    echo "remVer='${remVer}'"
    echo "pkgver='${pkgver}'"
  else
    if [ ! "${pkgver}" == "${remVer}" ]
    then
      echo "$1: ${pkgname}: ${remVer} vs. ${pkgver}" | \
        sed "s|^\([^:]\+\): \1:|\1:|"
    fi
  fi

elif ${versionenErmitteln}
then
  echo "$@" | \
    tr " " "\n" | \
    parallel -j${jobs} "${me}" "${optArgs[@]}" {} \;
  exit $?

else
  for s in "$@"
  do
    grep "^${s}:" "${versionenDatei}"
  done
fi