#!/bin/bash

packaging_check_init() {
  version_check=
}

packaging_check_file() {
  local filename="$1" status=0

  case $filename in
    configure.ac)
      check_versions || status=1
      version_check=Y
    ;;
    *.spec.in)
      check_versions || status=1
      version_check=Y
    ;;
    ChangeLog)
      check_versions || status=1
      version_check=Y
      if [ $status -eq 0 ]
      then
        check_changelog || status=1
      fi
    ;;
    *)
      #echo "No checks found for $filename"
      :
    ;;
  esac
  return $status
}

packaging_check_fin() {
  if [ "$version_check" ]
  then
    version=`get_configure_ac_version`
    case "$(match_version $version)" in
      prerelease|candidate|release)
        try_build || status=1
        if [ $status -eq 0 ]
        then
           cp $MYTMP/build/*.tar.* .
           echo "Check $(cd $MYTMP/build && ls *.tar.gz) before pushing tags"
        fi
      ;;
    esac
  fi
}

get_staged_file() {
  local optional=0
  if [ "$1" = "-o" ]
  then
    optional=1
    shift
  fi

  local dir="${1%/*}"
  if [ "$dir" = "$1" ]; then dir="."; fi
  mkdir -p $MYTMP/files/$dir

  test -f $MYTMP/files/$1 && return 0

  if [ "$from_cache" ]
  then
    if [ $optional -eq 1 ]
    then
      git show :$1 > $MYTMP/files/$1 2> /dev/null || rm -f $MYTMP/files/$1
    else
      git show :$1 > $MYTMP/files/$1
    fi
  else
    if [ $optional -eq 0 -o -f $1 ]
    then
      cp $1 $MYTMP/files/$1
    fi
  fi
}

try_build() {
  if [ -f $MYTMP/success ]; then return 0; fi
  mkdir -p $MYTMP/build
  git archive HEAD | tar -xf - -C "$MYTMP/build"
  git diff --staged | patch -p1 -d "$MYTMP/build"
  (cd $MYTMP/build; ./packaging/git-build || touch $MYTMP/fail)
  if [ -f $MYTMP/fail ]; then return 1; fi
  (cd $MYTMP/build; ./packaging/tar-compare . *.tar.gz || touch $MYTMP/fail)
  if [ -f $MYTMP/fail ]; then return 1; fi
  touch $MYTMP/success
  return 0
}

get_changelog_version() {
  get_staged_file ChangeLog
  local v=`sed -ne '1s/.*(\(.*\)).*/\1/p' $MYTMP/files/ChangeLog`
  if [ ! "$v" ]; then v="No version in ChangeLog!"; fi
  echo "$v"
}

get_configure_ac_version() {
  get_staged_file configure.ac
  local v=`sed -n \
         -e '/define(\[VERSION_MAJOR/s/.*\[\([^[]*\)\].*/\1/p' \
         -e '/define(\[VERSION_MINOR/s/.*\[\([^[]*\)\].*/.\1/p' \
         -e '/define(\[VERSION_FIX/s/.*\[\([^[]*\)\].*/.\1/p' \
         -e '/define(\[VERSION_SUFFIX/s/.*\[\([^[]*\)\].*/\1/p' \
         $MYTMP/files/configure.ac | tr -d '\n'`
  if [ ! "$v" ]; then v="No version in configure.ac!"; fi
  echo "$v"
}

get_configure_ac_package() {
  get_staged_file configure.ac
  local v=`sed -n -e 's/AC_INIT(\[\([^]]*\)\].*/\1/p' configure.ac`
  if [ ! "$v" ]; then v="noname"; fi
  echo "$v"
}

get_configure_ac_rpmrel() {
  get_staged_file configure.ac
  local v=`sed -n -e 's/PACKAGE_RPM_RELEASE="\([^"]*\)".*/\1/p' configure.ac`
  if [ ! "$v" ]; then v="norpmrel"; fi
  echo "$v"
}

get_spec_version() {
  get_staged_file -o "$1".spec.in
  test -f $MYTMP/files/"$1".spec.in || return 0 # Spec file is optional
  sed -n -e '1,/^%changelog/d' -e '/^*/{s/.*- \([0-9].*\)/\1/p;q}' "$1".spec.in
}

splitver() {
	local maj min fix sfx IFS=.-_

	maj=$1
	min=$2
	fix=$3
	sfx=$4

	set -- $5
	eval $maj=\$1 $min=\$2 $fix=\$3 $sfx=\$4
}

match_version() {
  case "$1" in
     [0-9]*.[0-9]*.[0-9]*_*)
       # x.y.z_ZZZZ = development branch (can be before or after pre/rc)
       echo "development"
     ;;
     [0-9]*.[0-9]*.[0-9]-pre[0-9]*)
       echo "prerelease"
     ;;
     [0-9]*.[0-9]*.[0-9]-rc.[0-9]*)
       echo "candidate"
     ;;
     [0-9]*.[0-9]*.[0-9]*)
       echo "release"
     ;;
     *)
       # Unknown
       :
     ;;
  esac
}

check_versions() {
  local status=0 exact=0 prerelease=0

  if [ -f $MYTMP/version-checked ]
  then
    read status < $MYTMP/version-checked
    return $status
  fi

  local confver=`get_configure_ac_version`
  case "$(match_version $confver)" in
     development)
       :
     ;;
     prerelease|candidate|release)
       exact=1
     ;;
     *)
       echo "Unrecognised version in configure.ac ($confver)"
       status=1
     ;;
  esac

  local clogver=`get_changelog_version`
  case "$(match_version $clogver)" in
     development)
       echo "Do not include development branch version in ChangeLog ($clogver)"
       status=1
     ;;
     prerelease|candidate)
       prerelease=1
     ;;
     release)
       :
     ;;
     *)
       echo "Unrecognised version format in ChangeLog ($clogver)"
       status=1
     ;;
  esac

  local package=`get_configure_ac_package`
  local specver=`get_spec_version $package`

  local clogmaj clogmin clogfix clogsfx
  local confmaj confmin conffix confsfx
  local specmaj specmin specfix specsfx

  splitver clogmaj clogmin clogfix clogsfx "$clogver"
  splitver confmaj confmin conffix confsfx "$confver"
  splitver specmaj specmin specfix specsfx "$specver"

  if [ "$specver" ]
  then
    if [ $specmaj -ne $clogmaj \
      -o $specmin -ne $clogmin \
      -o $specfix -ne $clogfix ]
    then
      echo "Main version of $package.spec.in ($specver) differs from ChangeLog ($clogver)"
      status=1
    fi
  fi

  if [ $status -eq 0 -a $exact -eq 0 ]
  then

    if [ $confmaj -gt $clogmaj \
      -o $confmin -gt $clogmin \
      -o $conffix -gt $clogfix ]
    then
      :
    elif [ $confmaj -eq $clogmaj \
        -a $confmin -eq $clogmin \
        -a $conffix -eq $clogfix \
        -a $prerelease -eq 1 ]
    then
      :
    else
      echo "Version in configure.ac ($confver) lesser than ChangeLog ($clogver)"
      status=1
    fi
  fi

  if [ $exact -eq 1 ]
  then
    echo "Running additional release checks"

    if [ "$confver" != "$clogver" ]
    then
      echo "Version in configure.ac ($confver) differs from ChangeLog ($clogver)"
      status=1
    fi

    if [ "$specver" ]
    then
      local confrpmrel=`get_configure_ac_rpmrel`
      if [ "$specsfx" != "$confrpmrel" ]
      then
        echo "%changelog suffix in $package.spec.in ($specsfx) differs from configure.ac PACKAGE_RPM_RELEASE ($confrpmrel)"
        status=1
      fi
    fi

    if [ ! "$TRAVIS_TAG" ]
    then
      if [ "$(git tag -l v$confver)" ]
      then
        echo "Tag v$confver already exists"
        status=1
      fi

      if [ "$(git config user.signingkey)" = "" ]
      then
        echo "You need to set up a PGP signing key e.g.:"
        echo "   gpg --list-keys"
        echo "and"
        echo "   git config user.signingkey SHORTID"
        echo "or"
        echo "   git config --global user.signingkey SHORTID"
        status=1
      fi

      git status -s | grep "^?" > $MYTMP/needclean
      if [ -s $MYTMP/needclean ]
      then
        echo "The following files must be dealt with before commit:"
        cat $MYTMP/needclean
        echo "e.g. add them to .gitignore or remove with 'git clean -fdx'"
        status=1
      fi
    fi
  fi

  echo $status > $MYTMP/version-checked
  return $status
}

check_changelog() {
  local status=0

  if [ -f $MYTMP/changelog-checked ]
  then
    read status < $MYTMP/changelog-checked
    return $status
  fi

  local version=`sed -ne '1s/.*(\(.*\)).*/\1/p' $filename`
  if [ "`echo $version | grep '[[:space:]]'`" != "" ]
  then
    echo "ChangeLog version contains whitespace! Fix it!"
    status=1
  fi

  echo $status > $MYTMP/changelog-checked
  return $status
}