name: Auto Version Bump

on:
  push:
    branches:
      - main
      - beta
    paths-ignore:
      - 'VERSION'
      - '.github/**'

permissions:
  contents: write

jobs:
  bump:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0
          token: ${{ secrets.GITHUB_TOKEN }}

      - name: Bump version
        id: bump
        run: |
          BRANCH="${{ github.ref_name }}"
          CURRENT=$(cat VERSION)
          IFS='.' read -r MAJOR MINOR PATCH <<< "${CURRENT%%-*}"
          PATCH=${PATCH:-0}

          if [ "$BRANCH" = "main" ]; then
            NEW_VERSION="${MAJOR}.${MINOR}.$((PATCH + 1))"
          else
            # beta branch: append -beta.N
            BETA_NUM=$(echo "$CURRENT" | grep -oP '(?<=beta\.)\d+' || echo "0")
            NEW_VERSION="${MAJOR}.${MINOR}.${PATCH}-beta.$((BETA_NUM + 1))"
          fi

          echo "$NEW_VERSION" > VERSION
          echo "version=$NEW_VERSION" >> $GITHUB_OUTPUT
          echo "Bumped $CURRENT → $NEW_VERSION"

      - name: Commit version
        run: |
          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: bump version to ${{ steps.bump.outputs.version }} [skip ci]"
          git push