name: bump-version

on:
  push:
    branches: [main]
  workflow_dispatch:

concurrency:
  group: bump-version
  cancel-in-progress: false

permissions:
  contents: write

jobs:
  bump:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v5
        with:
          fetch-depth: 0
          token: ${{ secrets.GITHUB_TOKEN }}

      - name: Skip if latest commit is already a release commit
        run: |
          SUBJECT=$(git log -1 --pretty=%s)
          if [[ "$SUBJECT" == "chore(release):"* ]]; then
            echo "Latest commit is a release commit ('$SUBJECT'). Skipping bump to avoid loop."
            exit 0
          fi
          echo "Latest commit subject: $SUBJECT — proceeding with bump."

      - name: Read current version
        id: current
        run: |
          if [[ ! -f VERSION ]]; then
            echo "VERSION file missing"
            exit 1
          fi
          VERSION=$(tr -d '[:space:]' < VERSION)
          echo "version=$VERSION" >> "$GITHUB_OUTPUT"

      - name: Compute next patch version
        id: next
        run: |
          CURRENT="${{ steps.current.outputs.version }}"
          STRIP_LEADING_V='s/^v//'
          CORE=$(echo "$CURRENT" | sed -E "$STRIP_LEADING_V")
          BASE="${CORE%%-*}"
          SUFFIX=""
          if [[ "$CORE" == *-* ]]; then
            SUFFIX="-${CORE#*-}"
          fi
          IFS='.' read -r MAJOR MINOR PATCH <<< "$BASE"
          if [[ -z "$MAJOR" || -z "$MINOR" || -z "$PATCH" ]]; then
            echo "Cannot parse version: $CURRENT"
            exit 1
          fi
          NEXT="v${MAJOR}.${MINOR}.$((PATCH + 1))${SUFFIX}"
          echo "next=$NEXT" >> "$GITHUB_OUTPUT"
          echo "Bumping $CURRENT → $NEXT"

      - name: Update VERSION and push bump commit
        run: |
          NEXT="${{ steps.next.outputs.next }}"
          printf '%s\n' "$NEXT" > VERSION
          git config user.name  "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"
          git add VERSION
          git commit -m "chore(release): bump version to $NEXT"
          git push origin HEAD:main