#!/usr/bin/env bash
###
### Description:
###
###    Create and tag a release for deployment to the build system and
###    remote hosting environment.
###
### Usage:
###
###        ./scripts/create-release.sh [1.2.3]
###
###    Specifying a release tag version number, like `1.2.3`, is optional;
###    the script will let you know what the prior release tag was by
###    reading from existing list of git tags.
###
### Notes:
###
### -  You must define the name of the project's main branch (sometimes known
###    as the `master`` branch on legacy projects) as well as the development
###    branch (typically called "develop") where features and fixes are merged
###    for initial integration testing.
###
### -  You typicaly want to be on the `deveop`` branch when creating a release.
###    You will get a warning to confirm when creating releases from any branch
###    other than `develop`. This is sometimes necessary for hotfix releases.
###
### -  Your must have a pristine working copy. This means that `git status`
###    must report that there are no changes or untracked files.
###
### -  A temporary branch `release-1.2.3` will be created and then merged to
###    the project's main branch.
###
### -  Finally, follow-up commands will be suggested for how to push the tag.
###
set -eu -o pipefail

function show_help() {
  sed -n 's/^###//p' ${0}
}

function cancel() {
  echo "Canceling. No release was created."
  exit 0;
}

while :; do
  case ${1:-} in
  -h | -\? | --help)
    show_help
    exit
    ;;
  -y|--yes)
    SKIP_CONFIRMATION=true
    ;;
  --) # End of all options.
    shift
    break
    ;;
  -?*)
    printf 'WARN: Unknown option (ignored): %s\n' "$1" >&2
    ;;
  *) # Default case: No more options, so break out of the loop.
    break ;;
  esac

  shift
done

if [[ -n $(git status -s) ]]; then
  echo "There are uncommitted changes in your local working tree. Please commit or stash them first."
  cancel
fi

# Establish branch and tag name variables
currentBranch=$(git symbolic-ref HEAD | sed -e 's,.*/\(.*\),\1,')
lastRelease=$(git describe --tags --abbrev=0)
devBranch=develop
masterBranch=main

if [ "$currentBranch" != "$devBranch" ]; then
  echo "WARNING: You're not currently on the '${devBranch}' branch."
  if [ "${SKIP_CONFIRMATION:-}" != "true" ]; then
    echo "Create release from branch '${currentBranch}' anyway? (Y/n)"
    read -n 1 -p "  > " proceed
    echo
    if [[ "$proceed" =~ ^[Nn] ]]; then
      cancel
    fi
  fi
fi

if [ $# -eq 0 ]; then
  echo "Please specify a release tag in 'X.Y.Z' format:"
  echo "  > (The previous release was ${lastRelease})"
  read -p "  > " versionLabel
else
  versionLabel=$1
fi
releaseBranch=release-$versionLabel

if [ "${SKIP_CONFIRMATION:-}" != "true" ]; then
  echo "Create release tag ${versionLabel}? (Y/n) "
  read -n 1 -p "  > " proceed
  echo
  if [[ "$proceed" =~ ^[Nn] ]]; then
    cancel
  fi
fi
set -x

# Wrapper for git command to ensure hooks do not interfere.
git="git -c core.hooksPath=/dev/null"

# Create the release branch from the -develop branch.
$git checkout -b $releaseBranch $currentBranch

# Update version number in Drupal website.
versionFile="docroot/sites/default/settings.php"
sed -i.backup -E "s/[0-9]+\.[0-9]+\.[0-9]+/$versionLabel/" $versionFile
rm $versionFile.backup

# Update version number in custom modules.
for i in $(cd docroot/modules/custom && ls -d */); do
  moduleName=${i%%/}
  infoFile=docroot/modules/custom/${moduleName}/${moduleName}.info.yml
  if [ -f ${infoFile} ]; then
    sed -i.backup -E "s/(version: .+)/version: $versionLabel/" $infoFile $infoFile
    rm $infoFile.backup
  fi
done

# Update version number in Drupal Theme.
ddev theme version $versionLabel
sleep 10

# Commit version number increment.
$git commit -am "Bump to version $versionLabel"

# Merge release branch with the new version number into master.
$git checkout $masterBranch
$git merge --no-ff $releaseBranch

# Create tag for new version from master.
$git tag $versionLabel

# Merge release branch with the new version number back into develop.
$git checkout $devBranch
$git merge --ff $releaseBranch

# Remove release branch.
$git branch -d $releaseBranch

# Switch back to master branch to review and push the release.
$git checkout $masterBranch

set +x

echo ""
echo ""
echo "  Release '$versionLabel' was created. You're now on the '$masterBranch'."
echo "  Please review the changes and execute the following commands to trigger CI workflows:"
echo ""
echo "      git push origin $versionLabel"
echo "      git push origin $masterBranch"
echo "      git checkout $devBranch"
echo "      git merge $masterBranch"
echo "      git push origin $devBranch"