#!/bin/bash

### Usage

# TODO remove -g xor -c and replace by last argument?

usage()
{
  echo "Usage: `basename $0` [-u userName] [-e userEmail] [-l userLogin] [-c cloneLocation] [-v] [-h] [-g gitname=cgal.git]" >&2
  echo >&2
  echo "  -v the version" >&2
  echo "  -h this info screen" >&2
  echo  >&2
}

# TODO write cloneLocation to config(file)

#  echo "  -m svnLocation
#  echo "  -r gives revision to start from. Other options than a number: LAST, BASE" >&2
#  echo "  -f skip fetch" >&2
#  echo "  -t skip tags" >&2

### Config

userName="Eric Berberich"
userEmail=eric@mpi-inf.mpg.de
userLogin=eric
svnGforge=svn+ssh://$userLogin@scm.gforge.inria.fr/svn/cgal
#fromSvn=file://$HOME/CGAL/gforge/cgal-m
fromSvn=$svnGforge
fromRev=1
gitName=cgal.git
skipTags=0
skipFetch=0
cloneLocation=

# parse command line arguments
while getopts "u:e:l:r:m:g:c:fth" OPT; do
  case "$OPT" in

# for developers
    u)  userName=$OPTARG
        ;;

    e)  userEmail=$OPTARG
        ;;

    l)  userLogin=$OPTARG
        ;;

    c)  cloneLocation=$OPTARG
        ;;

    g)  gitName=$OPTARG
        ;;

    h)  usage
        exit 0
        ;;

    v)  echo "`basename $0` version 0.1"
        exit 0
        ;;

# for svn2git cloners
    m)  fromSvn=$OPTARG
        ;;

    r)  fromRev=$OPTARG
        ;;

    f)  skipFetch=1
        ;;

    t)  skipTags=1
        ;;

# for all

    \?) # getopts issues an error message
        usage
        exit 1
        ;;
  esac
done

#shift `expr $OPTIND - 1`

if [ "$userName" = "" ]; then
  echo "No username with -u parameter given"
  exit 1
fi

if [ "$userEmail" = "" ]; then
  echo "No useremail with -e parameter given"
  exit 1
fi

if [ "$userLogin" = "" ]; then
  echo "No userlogin with -l parameter given"
  exit 1
fi

### Create repo

echo "Create new directory $gitname"
rm -fr ./$gitName
mkdir ./$gitName
echo

if [ "$cloneLocation" != "" ]; then
  
  echo "Cloning repo with svn-remotes from $cloneLocation"
  git clone $cloneLocation $gitName

fi

cd $gitName

# rewrite root
rewriteRoot=--rewrite-root=$svnGforge
#rewriteRoot=


# TODO tags; define behavior for developers, maybe as own svn-remote of git-remote that can be deleted and, if needed, reintegrated; OR: Convert to GIT tags?

internalReleasesTags="--tags tags/internal-releases"
internalReleasesTags=

debianTags="--tags tags/debian"
debianTags=

# git svn init
echo "git svn init repository:"
git svn init $fromSvn $rewriteRoot --prefix=svn/next/ --trunk branches/next 
git svn init $fromSvn $rewriteRoot --prefix=svn/ --trunk trunk 
git svn init $fromSvn $rewriteRoot --prefix=svn/features/ --branches branches/features
git svn init $fromSvn $rewriteRoot --prefix=svn/releases/ --branches branches/releases
# rename refs
# TODO remove 'stable' for developers?
sed -e 's|next/trunk|next|g' -e 's|svn/trunk|svn/stable|g' -i "" .git/config
if [ $skipTags = 0 ]; then 
  git svn init $fromSvn $rewriteRoot --prefix=svn/tags/releases/ --tags tags/releases
  sed -e 's|tags/releases/tags|tags/releases|g' -i "" .git/config
  if [ "$internalReleasesTags" != "" ]; then 
    git svn init $fromSvn $rewriteRoot --prefix=svn/tags/internal-releases/ $internalReleasesTags
    sed -e 's|tags/internal-releases/tags|tags/internal-releases|g' -i "" .git/config
  fi
  if [ "$debianTags" != "" ]; then 
    git svn init $fromSvn $rewriteRoot --prefix=svn/tags/debian/ $debianTags
    sed -e 's|tags/debian/tags|tags/debian|g' -i "" .git/config
  fi
fi
echo

# add author
echo "Add author to $gitName/.git/config"
git config user.name  "$userName"
git config user.email "$userEmail"
echo

echo "Using config $gitName/.git/config:"
cat .git/config

### git svn fetch

if [ $skipFetch = 0 ]; then

  if [ "$cloneLocation" != "" ]; then

  #  git config svn.authorsfile $(basename $(pwd))/git-authors

    echo "Rsyncing svn"
    rsync -arpP --progress $cloneLocation/.git/svn .git/
 
    echo "Fetching svn-branches"
    git fetch $cloneLocation refs/remotes/svn/stable:refs/remotes/svn/stable refs/remotes/svn/next:refs/remotes/svn/next 
    for branch in `svn ls $fromSvn/branches/features`; do 
      git fetch $cloneLocation refs/remotes/svn/features/${branch%/}:refs/remotes/svn/features/${branch%/}
    done;

    for branch in `svn ls $fromSvn/branches/releases`; do 
      git fetch $cloneLocation refs/remotes/svn/releases/${branch%/}:refs/remotes/svn/releases/${branch%/}
    done;

    # TODO new tags!

    git remote rm origin # TODO remove line?
   
    git svn fetch # TODO --authors-file=/tmp/cgal-authors-file.txt

    git branch -a
    git checkout master
    git branch -D local-svn/next

    git svn rebase --all

    git checkout -b local-svn/next remotes/svn/next
    git branch -D master

    git branch -a

  else

    ### Authors file
    echo "Get authors file with svn"
    svn cat $fromSvn/branches/next/Maintenance/git/authors-file.txt > /tmp/cgal-authors-file.txt
    echo 

    ### fetch from svn server
    echo "Fetch from SVN repository: git svn fetch -r$fromRev:HEAD "
    if [ "$fromRev" = "LAST" ]; then
      # last revision on next
      fromRev=$(svn info $fromSvn/branches/next | grep "Last Changed Rev: " | tr -d 'Last Changed Rev: ')
      echo "Last Revision: $fromRev"
    fi
    git svn fetch --authors-file=/tmp/cgal-authors-file.txt -r$fromRev:HEAD 
    echo

    rm -f /tmp/cgal-authors-files.txt

    ### Tags 
   
    # TODO


    ### Branch names

    # rename master next
    echo "Rename main branch to local/next"
    git branch -m master local/next

  fi

fi

# What about? 
### http://translate.org.za/blogs/wynand/en/content/changing-your-svn-repository-address-git-svn-setup
## unhandled.log (which lists all svn properties, such as svn:eol, that has not been converted).