#!/usr/bin/env bash

set -eu

CURDIR=$(cd $(dirname ${BASH_SOURCE[0]}); pwd)
SPEC=${CURDIR}/SPECS/git-lfs.spec
VERSION=$(\grep '^const Version' "${CURDIR}/../lfs/lfs.go" | sed 's|const Version = "\([0-9.]*\)"|\1|')
if [[ ${NODEPS:-0} == 0 ]]; then
  RPMBUILD=(rpmbuild --define "_topdir ${CURDIR}")
else
  RPMBUILD=(rpmbuild --define "_topdir ${CURDIR}" --nodeps)
fi
LOG=${CURDIR}/build.log
SUDO=${SUDO=`if which sudo > /dev/null 2>&1; then echo sudo; fi`}
export PATH=${PATH}:/usr/local/bin

exec 6>&1
exec 7>&2

exec > $LOG
exec 2>> $LOG

set -vx

echo "Downloading/checking for some essentials..." >&6
if which git > /dev/null 2>&1; then
  GIT_VERSION=($(git --version))
  IFS_OLD=${IFS}
  IFS=.
  GIT_VERSION=(${GIT_VERSION[2]})
  IFS=${IFS_OLD}
else
  GIT_VERSION=(0 0 0)
fi

REDHAT_VERSION=($(head -n 1 /etc/redhat-release | \grep -Eo '[0-9]+'))
REDHAT_NAME=$(awk '{print $1}' /etc/redhat-release)

if [[ ${REDHAT_VERSION[0]} == 5 ]]; then
  if ! rpm -q epel-release > /dev/null 2>&1; then
    $SUDO yum install -y epel-release
  fi
fi
$SUDO yum install -y make curl which rpm-build tar bison perl-Digest-SHA

mkdir -p ${CURDIR}/{BUILD,BUILDROOT,SOURCES,RPMS,SRPMS}

if ( [[ ${GIT_VERSION[0]} == 1 ]] && [[ ${GIT_VERSION[1]} < 8 ]] ) || [[ ${GIT_VERSION[0]} < 1 ]]; then
  if [[ ${REDHAT_VERSION[0]} != 6 ]]; then
    $SUDO yum install -y git
  else
    $SUDO yum install -y  curl-devel expat-devel gettext openssl-devel zlib-devel perl-Error perl-ExtUtils-MakeMaker emacs asciidoc xmlto gcc
    #I only include emacs here because the real RHEL rpm create emacs hook, so I will too for MAX compatibility
    pushd ${CURDIR}/SOURCES
      curl -L -O http://vault.centos.org/6.6/os/Source/SPackages/git-1.7.1-3.el6_4.1.src.rpm
      rpm2cpio git-1.7.1-3.el6_4.1.src.rpm | cpio -div git-init.el git.xinetd.in git.conf.httpd git-gui.desktop gitweb.conf.in
      NEW_GIT_VERSION=$(\grep ^Version: ${CURDIR}/SPECS/git.spec | sed  's|Version:\s*\(.*\)|\1|')
      curl -L -O http://kernel.org/pub/software/scm/git/git-${NEW_GIT_VERSION}.tar.xz
      "${RPMBUILD[@]}" -ba ${CURDIR}/SPECS/git.spec
      $SUDO yum install -y --nogpgcheck ${CURDIR}/RPMS/*/git-${NEW_GIT_VERSION}*.rpm ${CURDIR}/RPMS/*/perl-Git-${NEW_GIT_VERSION}*.rpm
    popd
  fi
fi

if [ ! -e ${CURDIR}/SOURCES/v${VERSION}.tar.gz ]; then
  if [ "${BUILD_LOCAL:=0}" == "1" ]; then
    echo "Zipping up current checkout of git-lfs..." >&6
    if [[ ${REDHAT_VERSION} == 5 ]]; then
      rm -rvf ${CURDIR}/tmptar
      mkdir -p ${CURDIR}/tmptar/git-lfs-${VERSION}
      pushd ${CURDIR}/..
        tar -c . --exclude rpm --exclude .git --exclude tmptar | tar -x -C ${CURDIR}/tmptar/git-lfs-${VERSION}/
      popd
      pushd ${CURDIR}/tmptar
        tar -zcf ${CURDIR}/SOURCES/v${VERSION}.tar.gz git-lfs-${VERSION}
      popd
      rm -rvf ${CURDIR}/tmptar
    else
      pushd ${CURDIR}/..
        tar -zcf ${CURDIR}/SOURCES/v${VERSION}.tar.gz --exclude v${VERSION}.tar.gz --exclude .git --exclude rpm . --transform "s:^:git-lfs-${VERSION}/:"
      popd
    fi
  else
    echo "Downloading git-lfs..." >&6
    mkdir -p ${CURDIR}/SOURCES
    pushd  ${CURDIR}/SOURCES
      curl -L -O https://github.com/github/git-lfs/archive/v${VERSION}.tar.gz
    popd
  fi
fi

if ! which go; then
  echo "Installing go... one way or another" >&6
  if [[ ${REDHAT_VERSION[0]} == 5 ]]; then
    $SUDO yum install -y curl.x86_64 glibc gcc
    ${CURDIR}/golang_patch.bsh
    "${RPMBUILD[@]}" -ba ${CURDIR}/SPECS/golang.spec
    $SUDO yum install -y --nogpgcheck ${CURDIR}/RPMS/noarch/golang-1*.rpm ${CURDIR}/RPMS/noarch/golang-pkg-bin-linux-amd64-1*.rpm ${CURDIR}/RPMS/noarch/golang-src-1*.noarch.rpm ${CURDIR}/RPMS/noarch/golang-pkg-linux-amd64-1*.noarch.rpm
  else
    $SUDO yum install -y epel-release
    $SUDO yum install -y golang
  fi
fi

if which ruby > /dev/null 2>&1; then
  IFS_OLD=${IFS}
  IFS=.
  RUBY_VERSION=($(ruby -e "print RUBY_VERSION"))
  IFS=${IFS_OLD}
else
  RUBY_VERSION=(0 0 0)
fi

if [[ ${RUBY_VERSION[0]} < 2 ]]; then
  if [[ ${REDHAT_VERSION[0]} < 7 ]]; then
    echo "Downloading ruby..." >&6

    if ! rpm -q epel-release; then
      $SUDO yum install -y epel-release #Optional part of centos
    fi

    $SUDO yum install -y patch libyaml-devel glibc-headers autoconf gcc-c++ glibc-devel readline-devel zlib-devel libffi-devel openssl-devel automake libtool sqlite-devel
    pushd ${CURDIR}/SOURCES
      curl -L -O http://cache.ruby-lang.org/pub/ruby/2.2/ruby-2.2.2.tar.gz
    popd
    echo "Building ruby..." >&6
    "${RPMBUILD[@]}" -ba ${CURDIR}/SPECS/ruby.spec
    echo "Installing ruby..." >&6
    $SUDO yum install -y --nogpgcheck ${CURDIR}/RPMS/x86_64/ruby*.rpm
  else
    $SUDO yum install -y ruby ruby-devel
  fi
fi

if ! which ronn; then
  echo "Downloading some ruby gems..." >&6
  pushd ${CURDIR}/SOURCES
    curl -L -O https://rubygems.org/downloads/rdiscount-2.1.8.gem
    curl -L -O https://rubygems.org/downloads/hpricot-0.8.6.gem
    curl -L -O https://rubygems.org/downloads/mustache-1.0.1.gem
    curl -L -O https://rubygems.org/downloads/ronn-0.7.3.gem
  popd

  echo "Building ruby gems..." >&6
  "${RPMBUILD[@]}" -ba ${CURDIR}/SPECS/rubygem-rdiscount.spec
  "${RPMBUILD[@]}" -ba ${CURDIR}/SPECS/rubygem-mustache.spec
  "${RPMBUILD[@]}" -ba ${CURDIR}/SPECS/rubygem-hpricot.spec
  "${RPMBUILD[@]}" -ba ${CURDIR}/SPECS/rubygem-ronn.spec

  echo "Installing ruby gems..." >&6
  $SUDO yum install -y --nogpgcheck $(ls ${CURDIR}/RPMS/noarch/rubygem-*.rpm ${CURDIR}/RPMS/x86_64/rubygem-*.rpm | grep -v debuginfo)
fi

echo "Build git-lfs rpm..." >&6
sed -i 's|\(Version:\s*\).*|\1'"${VERSION}"'|' ${CURDIR}/SPECS/git-lfs.spec 
"${RPMBUILD[@]}" -ba ${CURDIR}/SPECS/git-lfs.spec
#if [ "`stat -c '%U' ${CURDIR}/SPECS/git-lfs.spec`" == "UNKNOWN" ]; then
#  $SUDO cp ${CURDIR}/SPECS/git-lfs.spec ${CURDIR}/SPECS/git-lfs2.spec
#  "${RPMBUILD[@]}" -bs ${CURDIR}/SPECS/git-lfs2.spec
#  $SUDO rm -f ${CURDIR}/SPECS/git-lfs2.spec
#else
#  "${RPMBUILD[@]}" -bs ${CURDIR}/SPECS/git-lfs.spec
#fi

echo "All Done!" >&6