#!/bin/bash

# usage
if [ $# != 1 ] ; then
  echo -e "Usage: ${0} <release_branch>"
  exit 1
fi

releaseBranch="${1}"

lastTag="$(git for-each-ref --format="%(refname)" --sort=-taggerdate --count=1 refs/tags | cut -d '/' -f 3)"
majorVersion=$(echo $lastTag | cut -d '.' -f 1)
minorVersion=$(echo $lastTag | cut -d '.' -f 2)
updateVersion=$(echo $lastTag | cut -d '.' -f 3)
newUpdateVersion=$((updateVersion+1))
newVersion="${majorVersion}.${minorVersion}.${newUpdateVersion}"


## Make sure no changes
if ! git diff-index --quiet HEAD -- ; then
  echo "ERROR: You have unsaved changes."
  exit 1
fi


# cleanup trap
function cleanup {
  echo -e "\nINFO: Cleaning up..."
  git checkout ${releaseBranch}
  git checkout .
  git branch -D temp
}
trap cleanup EXIT


# Confirm
echo -e "INFO: Previous tag: ${lastTag}"
echo -e "INFO: Do you want to create release ${newVersion} from release branch ${releaseBranch}? y/n"
read a
if [[ "${a}" != "y" && "${a}" != "Y" ]] ; then
  exit 0;
fi


# validate tag does not exist
echo -e "INFO: Fetching tags and branches and validating they do not exist..."
if ! git fetch --all --tags > /dev/null ; then
  echo -e "ERROR: Tags and branches could not be fetched!"
  exit 1
fi
if git tag | grep ${newVersion} > /dev/null ; then
  echo -e "ERROR: Tag already exists!"
  exit 1
fi


# make sure gpg-agent is available and loaded
echo -e "\nINFO: Searching for gpg-agent..."
if ! which gpg-agent ; then
  echo -e "ERROR: gpg-agent missing!"
fi
if ! gpg-agent 2>&1 | grep "running and available" ; then
  echo -e "WARN: gpg-agent not running, trying to start..."
  if ! gpg-agent --daemon ; then
    echo -e "ERROR: Failed to initialize gpg-agent, please make sure it is up and running before continuing!"
    exit 1
  fi
  if ! gpg-agent 2>&1 | grep "running and available" ; then
    echo -e "ERROR: Failed to initialize gpg-agent, please make sure it is up and running before continuing!"
    exit 1
  fi
fi


# Checkout release branch
echo -e "\nINFO: Checking out release branch ${releaseBranch}"
if ! git checkout ${releaseBranch} ; then
  echo -e "ERROR: Failed to checkout branch ${releaseBranch}"
  exit 1
fi


# create temp branch
echo -e "\nINFO: Creating temp branch..."
if ! git checkout -b temp ; then
  echo -e "ERROR: Failed to create temp branch!"
  exit 1
fi


# set hotfix version
echo -e "\nINFO: Setting version..."
if ! mvn versions:set -DgenerateBackupPoms=false -DnewVersion=${newVersion} > /dev/null ; then
  echo -e "ERROR: Failed to set new version!"
  exit 1
fi


# build
echo -e "\nINFO: Doing a build with new version..."
if ! mvn clean package -DskipTests > /dev/null ; then
  echo -e "ERROR: Failed to build with new version!"
  exit 1
fi


# commit to tag
echo -e "\nINFO: Creating tag..."
if ! git add . ; then
  echo -e "ERROR: Failed to git add"
  exit 1
fi
if ! git commit -m "[Project] Set new version ${newVersion}" ; then
  echo -e "ERROR: Failed to git commit"
  exit 1
fi
if ! git tag --sign --message "[Project] New Version ${newVersion}" ${newVersion} ; then
  echo -e "ERROR: Failed to git tag"
  exit 1
fi


# git push
echo -e "\nINFO: Hotfix ${newVersion} created. Do you want to push to origin? y/n"
read a
if [[ "${a}" == "y" || "${a}" == "Y" ]] ; then
  echo -e "INFO: Pushing to origin..."
  if ! git push origin ${newVersion} ; then
    echo -e "ERROR: Failed to push tag"
    exit 1
  fi
  echo -e "\nINFO: Pushed hotfix tag ${newVersion}"
else
  echo -e "WARN: Release not pushed!"
fi


echo -e "\nINFO: Hotfix ${newVersion} created."
exit 0