name: Version Bump

# Triggered when the chore/version-bump PR is merged to main.
# Reads the bump:patch / bump:minor / bump:major label from the merged PR.
# Updates debian/changelog, commits it, and pushes a vX.Y.Z tag.
# release.yml triggers on that tag push and builds the release.

on:
  pull_request:
    types:
      - closed
    branches:
      - main

permissions:
  contents: write

jobs:
  bump:
    runs-on: ubuntu-latest
    if: |
      github.event.pull_request.merged == true &&
      github.event.pull_request.head.ref == 'chore/version-bump'

    steps:
      - uses: actions/checkout@v7
        with:
          fetch-depth: 0
          token: ${{ secrets.GITHUB_TOKEN }}

      - name: Determine bump type from PR label
        id: bump_type
        env:
          GH_TOKEN:  ${{ secrets.GITHUB_TOKEN }}
          PR_NUMBER: ${{ github.event.pull_request.number }}
        run: |
          LABELS=$(gh pr view "$PR_NUMBER" --json labels --jq '[.labels[].name] | join(",")')
          echo "Labels found: $LABELS"

          if echo "$LABELS" | grep -q 'bump:major'; then
            echo "type=major" >> "$GITHUB_OUTPUT"
          elif echo "$LABELS" | grep -q 'bump:minor'; then
            echo "type=minor" >> "$GITHUB_OUTPUT"
          else
            echo "type=patch" >> "$GITHUB_OUTPUT"
          fi

      - name: Extract and bump version
        id: version
        env:
          BUMP_TYPE: ${{ steps.bump_type.outputs.type }}
        run: |
          # Prefer latest tag; fall back to debian/changelog on first run
          CURRENT=$(git describe --tags --abbrev=0 2>/dev/null | sed 's/^v//' \
            || grep -m1 '(' debian/changelog | sed 's/.*(\(.*\)).*/\1/')
          MAJOR=$(echo "$CURRENT" | cut -d. -f1)
          MINOR=$(echo "$CURRENT" | cut -d. -f2)
          PATCH=$(echo "$CURRENT" | cut -d. -f3)

          if [[ "$BUMP_TYPE" == "major" ]]; then
            NEW="$((MAJOR + 1)).0.0"
          elif [[ "$BUMP_TYPE" == "minor" ]]; then
            NEW="${MAJOR}.$((MINOR + 1)).0"
          else
            NEW="${MAJOR}.${MINOR}.$((PATCH + 1))"
          fi

          echo "Bumping $CURRENT → $NEW ($BUMP_TYPE)"
          echo "current=$CURRENT" >> "$GITHUB_OUTPUT"
          echo "new=$NEW"         >> "$GITHUB_OUTPUT"

      - name: Collect accumulated changes
        id: commits
        run: |
          # Read from the CHANGES.md that was merged in
          LOG=$(cat .github/version-bump/CHANGES.md 2>/dev/null || true)
          EOF=$(openssl rand -hex 16)
          echo "log<<$EOF" >> "$GITHUB_OUTPUT"
          echo "$LOG"      >> "$GITHUB_OUTPUT"
          echo "$EOF"      >> "$GITHUB_OUTPUT"

      - name: Prepend new changelog entry
        env:
          NEW_VERSION: ${{ steps.version.outputs.new }}
          COMMITS:     ${{ steps.commits.outputs.log }}
        run: |
          DATE=$(date -R)
          {
            echo "pve-mod ($NEW_VERSION) stable; urgency=low"
            echo ""
            while IFS= read -r line; do
              [[ -n "$line" ]] && echo "  * $line"
            done <<< "$COMMITS"
            [[ -z "$COMMITS" ]] && echo "  * Automated version bump."
            echo ""
            echo " -- github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>  $DATE"
            echo ""
            cat debian/changelog
          } > debian/changelog.new
          mv debian/changelog.new debian/changelog

      - name: Commit and tag
        run: |
          git config user.name  "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
          git add debian/changelog
          git rm --ignore-unmatch .github/version-bump/CHANGES.md
          git commit -m "Release v${{ steps.version.outputs.new }}"
          git tag v${{ steps.version.outputs.new }}
          git push origin v${{ steps.version.outputs.new }}