#!/bin/bash -e

# project.version
if [ "$VERSION" == "" ]; then
  echo "VERSION has not been set"
  exit 1;
fi

if [ "$1" = "-y" ]; then
  AUTOACCEPT=true
else
  AUTOACCEPT=false
fi

PREVIOUS_VERSION=$(grep -E "## \[[0-9]+\.[0-9]+\.[0-9]+\]" CHANGELOG.md | awk '{gsub(/\[|\]/,"",$2); print $2}' | awk 'NR == 2')

if [ -z "$PREVIOUS_VERSION" ]; then
  echo "Cannot find PREVIOUS_VERSION."
  exit 1
fi

if [ "$VERSION" == "$PREVIOUS_VERSION" ]; then
  echo "VERSION $VERSION equal to PREVIOUS_VERSION $PREVIOUS_VERSION"
  exit 1
fi

echo "Announcing $PREVIOUS_VERSION -> $VERSION"

DOCUMENTATION_DIR="documentation"
RELEASE_DOCS_DIR="${DOCUMENTATION_DIR}/release-latest"
SNAPSHOT_DOCS_DIR="${DOCUMENTATION_DIR}/snapshot"

if [ "$(git status --porcelain=v1 $DOCUMENTATION)" != "" ]; then
  echo "ERROR: To proceed, the current branch must not contain uncommitted changes in directory '${DOCUMENTATION_DIR}'"
  # ask for user confirmation
  if [[ "$AUTOACCEPT" = false ]]; then
    read -p "revert changes? (y/n)? " -n 1 -r
    echo
    if [[ $REPLY =~ ^[Yy]$ ]]; then
      git checkout ${DOCUMENTATION_DIR}
    else
      exit 1
    fi
  else
    echo "Reverting changes in directory '${DOCUMENTATION_DIR}'"
    git checkout ${DOCUMENTATION_DIR}
  fi
fi

#escape_for_sed() { echo "$1" | sed -e 's/[]\/$*.^|[]/\\&/g'; }

# Make a separate branch because master branch is protected

BRANCH="$VERSION-update-refs"
if [ "$(git show-ref refs/heads/$BRANCH)" != "" ]; then
  echo "ERROR: Branch $BRANCH already exists."
  if [[ "$AUTOACCEPT" = false ]]; then
      read -p "Delete local branch? (y/n)? " -n 1 -r
      echo
      if [[ ! $REPLY =~ ^[Yy]$ ]]; then
        exit 1
      else
        git branch -D $BRANCH
      fi
    else
      echo "Deleting local branch $BRANCH"
      git branch -D $BRANCH
    fi
  # Checkout local master branch so that changes to this script can be tested without pushing the script to the remote branch
  git checkout --track master -b $BRANCH
else
  git checkout --track origin/master -b $BRANCH
fi

# update version number in snapshot docs

echo "Updating version numbers in (snapshot) installation documentation"
# On local machine (OSX) Use "sed -i '' ..." instead of "sed -i -e ..." as the latter creates a new file.
# On Github Action workflow the "sed -i -e ..." is required as otherwise it results in failure
#   "can't read s/0.49.0/0.49.1/g: No such file or directory"
sed -i -e "s/$PREVIOUS_VERSION/$VERSION/g" ${SNAPSHOT_DOCS_DIR}/docs/install/cli.md
sed -i -e "s/$PREVIOUS_VERSION/$VERSION/g" ${SNAPSHOT_DOCS_DIR}/docs/install/integrations.md
git --no-pager diff ${DOCUMENTATION_DIR}

# ask for user confirmation before committing
if [[ "$AUTOACCEPT" = false ]]; then
  read -p "Accept changes (y/n)? " -n 1 -r
  echo
  if [[ ! $REPLY =~ ^[Yy]$ ]]; then
    exit 1
  fi
fi

# Replace release documentation with current snapshot documentation.

echo "Replace release documentation with current snapshot documentation"
# Support removal of files which still exists in release docs but which are no longer present in snapshot docs
rm -rf ${RELEASE_DOCS_DIR}/docs/
cp -r ${SNAPSHOT_DOCS_DIR}/docs/ ${RELEASE_DOCS_DIR}/docs/
# Note that directory "${SNAPSHOT_DOCS_DIR}/overrides/" should not replace "${RELEASE_DOCS_DIR}/overrides/"
cp -r ${SNAPSHOT_DOCS_DIR}/mkdocs.yml ${RELEASE_DOCS_DIR}
# Add files which previously did not yet exists in the release docs but were present in the snapshot docs
git add --all
# Display sorted list of files changed but do not show contents as that could be a lot
git status --porcelain=v1 documentation | sort

# Commit and push changes
if [[ "$AUTOACCEPT" = false ]]; then
  read -p "Commit and push changes (y/n)? " -n 1 -r
  echo
  if [[ ! $REPLY =~ ^[Yy]$ ]]; then
    exit 1
  fi
fi
git commit -m "Updated refs to latest ($VERSION) release"
git push origin $BRANCH