#!/usr/bin/env bash
source "${TAMARIN_UTIL}"

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

# Get commits log as changelog

BUILD_BRANCH=$(get_opt build_branch dist/ubuntu/precise/master)
BUILD_TAG=$(get_opt build_tag "last")

echo "BUILD TAG IS ${BUILD_TAG}"

if [[ ${BUILD_TAG} == "last" ]]
then
  git checkout ${BUILD_BRANCH}
  tags=$(git tag master -l "release/*"|sort -r)
else
  info "DEBUG DEBUG DEBUG "
  tagbranch="build-tag-${BUILD_TAG}"
  git checkout -b ${tagbranch}
  set_opt "tag_branch" "${tag_branch}"
  local tags="${BUILD_TAG}"
fi

if [[ -z ${tags} ]]
then
  error "No relase tag found, you repo must have a tag like 'release/X.X'"
  exit 2
fi

touch debian/changelog

for tag in ${tags}
do
  logs=$(git log --pretty=format:"%an - %h : %s" ${tag} | sed 's/"/\\"/g')

  # Set the top commiter as the maintainer of the project if not defined
  top_contributor=$(git log --pretty=short | git shortlog -s -n -e | sed 's/^\s*[0-9]*\s*//g' | head -n 1)
  maintainer=$(get_opt maintainer "${top_contributor}")

  project_name=$(get_opt project_name)
  version=${tag#*/} #$(get_opt version 0.0.0)
  version=${version/_/-} #$(get_opt version 0.0.0)

  distribution=$(get_opt distribution UNRELEASED)
  urgency=$(get_opt urgency low)

  commit_count=$(git rev-list --count --first-parent HEAD)
  current_commit=$(git log -n 1 --pretty=format:"%h")
  version_suffix=tamarin${commit_count}~${current_commit}
  package_version=${version}-${version_suffix}

  # Define package_version opt if not defined
  if [ -z "$(get_opt package_version)" ]; then
      # Share computed package version
      set_opt package_version "${package_version}"
  fi

  # Define project_version opt if not defined
  if [ -z "$(get_opt project_version)" ]; then
      # Share computed project version
      set_opt project_version "${version}"
  fi

  echo "${project_name} (${package_version}) ${distribution}; urgency=${urgency}" >> debian/changelog

  echo >> debian/changelog

  while read -r entry; do
    echo "  * ${entry}" >> debian/changelog
  done <<< "$(echo -e "${logs}" | sed 's/^"//')"

  echo >> debian/changelog

  echo " -- ${maintainer}  $(date -R)" >> debian/changelog
  echo >> debian/changelog
done