branch_release

#!/bin/bash
set -euo pipefail

# -------------------------------------------------------------------
# This script assumes:
# - It is running in a GitHub Actions release event where GITHUB_REF
#   is set (e.g. "refs/tags/v1.2.3" or "refs/tags/1.2.3").
# - The GitHub CLI (gh) is installed and logged in.
#
# What it does:
# 1. Extracts the semver (major.minor.patch) from the current release tag.
# 2. Computes the target MAJOR branch release (e.g. "1.x.x") and the
#    target MINOR branch release (e.g. "1.2.x").
# 3. Downloads all assets from the current release.
# 4. For each target release:
#     - If it does not exist, it creates a new release with that tag.
#     - Uploads (or overwrites, via --clobber) the downloaded assets.
# -------------------------------------------------------------------

# Determine the current release tag.
# (Assumes that GITHUB_REF is like "refs/tags/v1.2.3")
GITHUB_REF=${GITHUB_REF:-${TAG_REF}}
if [ -z "${GITHUB_REF:-}" ]; then
  echo "GITHUB_REF is not set. Exiting."
  exit 1
fi

CURRENT_TAG="${GITHUB_REF##*/}"
echo "Current release tag: $CURRENT_TAG"

# Remove a leading "v" if present (e.g. "v1.2.3" -> "1.2.3")
SEMVER=$(echo "$CURRENT_TAG" | sed 's/^v//')
echo "Parsed semver: $SEMVER"

# Extract major, minor, patch numbers.
IFS='.' read -r MAJOR MINOR PATCH <<< "$SEMVER"
if [ -z "$MAJOR" ] || [ -z "$MINOR" ] || [ -z "$PATCH" ]; then
  echo "Invalid semver detected: $SEMVER"
  exit 1
fi

# Build target release tags using "x" for unspecified parts.
MAJOR_RELEASE="${MAJOR}.x.x"
MINOR_RELEASE="${MAJOR}.${MINOR}.x"
echo "Target MAJOR release: $MAJOR_RELEASE"
echo "Target MINOR release: $MINOR_RELEASE"

# Create a temporary directory for the current release’s assets.
ASSETS_DIR=$(mktemp -d)
echo "Downloading assets into ${ASSETS_DIR}..."
gh release download "$CURRENT_TAG" -D "$ASSETS_DIR"

# Function to create or update a target release by uploading assets.
create_or_update_release() {
  local release_tag="$1"
  echo "Processing release: ${release_tag}"

  # Check if the release exists; if not, create it.
  if ! gh release view "$release_tag" > /dev/null 2>&1; then
    echo "Release ${release_tag} does not exist. Creating it."
    gh release create "$release_tag" \
      --title "$release_tag" \
      --notes "Auto generated release branch for ${release_tag}"
  else
    echo "Release ${release_tag} already exists. Overwriting assets..."
  fi

  # Loop over each asset and upload (using --clobber to replace any existing asset
  # with the same filename).
  for asset in "$ASSETS_DIR"/*; do
    if [ -f "$asset" ]; then
      echo "Uploading asset: $(basename "$asset") to ${release_tag}"
      gh release upload "$release_tag" "$asset" --clobber
    fi
  done
}

# Process both the major and minor target releases.
create_or_update_release "$MAJOR_RELEASE"
create_or_update_release "$MINOR_RELEASE"

echo "Artifacts successfully copied/updated to ${MAJOR_RELEASE} and ${MINOR_RELEASE}."

# Clean up the temporary assets directory.
rm -rf "$ASSETS_DIR"