#!/usr/bin/env bash

cd src

if [ -f debian/changelog ] || [ ! -d .git ]; then
    tamarin_info "Not a Git repository or Debian changelog already exists !"
    exit
fi

# Get pkg tags as tie points in commit history
pkg_tags="$(git for-each-ref --format '%(refname)' refs/tags | tac)"

# Set starting commit
start_commit='HEAD'

# Get commits log as changelog

current_release=$(git describe --match "release/*" --abbrev=0)

if [[ -z ${current_release} ]]
then
  tamarin_warn "No release tag found, you repo must have a tag like 'release/*'"
  exit 1
fi

touch debian/changelog

project_name=$(tamarin_db get project_name)
distribution=$(tamarin_db get distribution UNRELEASED)
urgency=$(tamarin_db get urgency low)

function gen_changelog_entry {
  start_commit=$1
  previous_pkg="$(git describe --long --always --match='pkg/*' $start_commit)"
  if [[ "${previous_pkg}" =~ "pkg/" ]]
  then
	  tamarin_info "dernier paquet trouvé : ${previous_pkg}"
	  extended_version=$(echo $previous_pkg | cut -d "/" -f4)
	  exploded_version="$(echo $extended_version | sed "s/\([a-z0-9.]\+\)-\([0-9]\+\)\(-\([0-9]\+\)-\(g[a-z0-9]\+\)\)\?$/\1 \2 \4 \5/")"
	  upstream_version=$(echo $exploded_version | cut -d " " -f1)
	  package_version=$(echo $exploded_version | cut -d " " -f2)
	  distance_to_pkg=$(echo $exploded_version | cut -d " " -f3)
	  if [[ "${distance_to_pkg}" > 0 ]]
	  then
	    tamarin_info "${distance_to_pkg} commit depuis le dernier paquet"
	    stop_commit="$(git describe --abbrev=0 --always --match='pkg/*' $start_commit)"
	    version=$(expr $package_version + 1)
	  else
	    stop_commit="$(git describe --abbrev=0 --always --match='pkg/*' ${start_commit}^1)"
	    version=$package_version
	    tamarin_info "version ${tamarin}"
	  fi
	  if [[ "${start_commit}" = "${stop_commit}" ]]
	  then
	    return 1
	  fi
  elif [[ "${start_commit}" = "${stop_commit}" ]]
  then
    return 1
  else
    tamarin_info "Pas encore de paquet pour ce dépôt"
    version="1"
    upstream_version="${current_release#release/}"
    stop_commit="${current_release}"
  fi

  # Set the top commiter as the maintainer of the project if not defined
  # If commit is tagged with pkg/, use tagger name as maintainer
  # Else if commit is not tagged with pkg/, use commiter name as maintainer
  current_release="$(git describe --abbrev=0 --always --match='release/*' $start_commit)"
  tamarin_info "Création de l’entrée de changelog entre ${start_commit} et ${stop_commit}"
  if [[ "$current_release" = "$start_commit" ]] # No package yet, git describe --always returned commit itself
  then
    echo "on passe bien là"
    current_release='UNRELEASED'
    return 1
  fi
  if [ "${start_commit}" == "HEAD" ]
  then
    maintainer="$(git log -n1 --format='%cn <%ce>')"
    maintainer=$(tamarin_db get maintainer "${maintainer}")
  else
    maintainer_commit="$(git describe --abbrev=0 --always --match='pkg/*' $start_commit)"
    maintainer="$(git tag -l --format='%(creator)' ${maintainer_commit})"
  fi
  maintainer=$(tamarin_db get maintainer "${maintainer}")

  version=${upstream_version}-${version}
  version=${version/_/-}
  tamarin_warn "traitement de la version $version"
  changelog_entry="${project_name} (${version}) ${distribution}; urgency=${urgency}"
  echo "$changelog_entry" >> debian/changelog
  echo >> debian/changelog
  for commit in "$(git log --format='%H' ${stop_commit}..${start_commit})"
  do
    subject="$(git log -n1 --format=%s ${commit})"
    tamarin_info "${subject}"
    echo "  * ${subject}" >> debian/changelog
    start_commit="$(git log -n1 --format='%H' ${commit}^1)"
  done
  echo >> debian/changelog
  changelog_sign=" -- ${maintainer}  $(date --rfc-2822)"
  echo "$changelog_sign" >> debian/changelog
  echo >> debian/changelog
  start_commit=${stop_commit}
}

function gen_changelog() {
#  while [[ $current_release != 'UNRELEASED' ]]
#  do
#    echo $start_commit
#    echo $current_release
#    gen_changelog_entry $start_commit
#  done
  while gen_changelog_entry $start_commit
  do
	  echo $changelog_entry
  done
}

gen_changelog
cp debian/changelog /dist/changelog