name: Open / Update Version Bump PR

# Triggered by any push to main where src/ files changed.
# This happens when a feature PR is merged to main.
# Creates a dedicated chore/version-bump branch and opens a PR from it.
# When creating a new PR it assigns the default "bump:patch" label.
# When updating an existing PR the label is NOT changed, preserving any
# manual label change (e.g. bump:minor, bump:major) made by a reviewer.
# The bot guard prevents this from firing on changelog commits.

on:
  push:
    branches:
      - main
    paths:
      - 'src/**'

permissions:
  contents: write
  pull-requests: write

jobs:
  pr:
    runs-on: ubuntu-latest
    if: github.actor != 'github-actions[bot]'

    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0
          token: ${{ secrets.GITHUB_TOKEN }}

      - name: Collect src/ commits from merge
        id: commits
        run: |
          LOG=$(git log "HEAD~1..HEAD" --oneline -- src/ | head -50)
          EOF=$(openssl rand -hex 16)
          echo "log<<$EOF" >> "$GITHUB_OUTPUT"
          echo "$LOG"      >> "$GITHUB_OUTPUT"
          echo "$EOF"      >> "$GITHUB_OUTPUT"

      - name: Create or reset version bump branch
        run: |
          git checkout -B chore/version-bump
          git push origin chore/version-bump --force

      - name: Create or update version bump PR
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          COMMITS:  ${{ steps.commits.outputs.log }}
        run: |
          BUMP_BRANCH="chore/version-bump"
          VERSION=$(grep -m1 '(' debian/changelog | sed 's/.*(\(.*\)).*/\1/')
          TITLE="chore: bump pve-mod to v${VERSION}"

          {
            echo "## Changes merged to main"
            echo ""
            echo "${COMMITS:-No src/ changes detected.}"
            echo ""
            echo "---"
            echo "*Apply a bump:minor or bump:major label before merging if needed.*"
            echo "*Default label is bump:patch.*"
          } > /tmp/pr-body.md

          EXISTING=$(gh pr list \
            --head "$BUMP_BRANCH" \
            --base main \
            --json number --jq '.[0].number' 2>/dev/null || true)

          if [[ -n "$EXISTING" ]]; then
            gh pr edit "$EXISTING" \
              --title "$TITLE" \
              --body-file /tmp/pr-body.md
            echo "Updated PR #${EXISTING} body and title (label unchanged)"
          else
            gh pr create \
              --title "$TITLE" \
              --body-file /tmp/pr-body.md \
              --base main \
              --head "$BUMP_BRANCH" \
              --label "bump:patch"
            echo "Opened new version bump PR with label bump:patch"
          fi