# Nova Release Pipeline — GitHub Actions (production)
#
# Runs on push to main. Computes the next semver tag from the latest tag +
# commit history, creates the tag, updates floating MAJOR.MINOR and MAJOR tags,
# and creates a GitHub release with auto-generated notes.
#
# Semver policy:
#   - Regular phase commit -> bump PATCH (v1.6.0 -> v1.6.1)
#   - Milestone completion ("docs(milestone): complete") -> bump MINOR (v1.6.1 -> v1.7.0)
#   - Major bumps are manual (not implemented here).
name: nova-release

on:
  push:
    branches: [main]

jobs:
  release:
    name: Compute semver + update tags
    runs-on: ubuntu-latest
    permissions:
      contents: write
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0  # need full history for tag computation

      - uses: actions/setup-python@v5
        with:
          python-version: "3.12"

      - name: Compute next version
        id: version
        run: |
          # Get the latest tag
          LATEST_TAG=$(git describe --tags --abbrev=0 2>/dev/null || echo "v0.0.0")
          echo "Latest tag: $LATEST_TAG"

          # Parse the version
          MAJOR=$(echo "$LATEST_TAG" | sed -n 's/v\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\)/\1/p')
          MINOR=$(echo "$LATEST_TAG" | sed -n 's/v\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\)/\2/p')
          PATCH=$(echo "$LATEST_TAG" | sed -n 's/v\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\)/\3/p')

          # Check if this is a milestone completion (look for "docs(milestone): complete" in the latest commits)
          if git log --format='%s' -5 | grep -q 'docs(milestone): complete'; then
            # Milestone completion -> bump minor
            MINOR=$((MINOR + 1))
            PATCH=0
          else
            # Regular phase -> bump patch
            PATCH=$((PATCH + 1))
          fi

          NEW_TAG="v${MAJOR}.${MINOR}.${PATCH}"
          MAJOR_MINOR_TAG="v${MAJOR}.${MINOR}"
          MAJOR_TAG="v${MAJOR}"

          echo "new_tag=$NEW_TAG" >> $GITHUB_OUTPUT
          echo "major_minor_tag=$MAJOR_MINOR_TAG" >> $GITHUB_OUTPUT
          echo "major_tag=$MAJOR_TAG" >> $GITHUB_OUTPUT
          echo "Next version: $NEW_TAG"

      - name: Create version tag
        run: |
          git tag ${{ steps.version.outputs.new_tag }}
          git push origin ${{ steps.version.outputs.new_tag }}

      - name: Update floating MAJOR.MINOR tag
        run: |
          git tag -f ${{ steps.version.outputs.major_minor_tag }} ${{ steps.version.outputs.new_tag }}
          git push origin ${{ steps.version.outputs.major_minor_tag }} --force

      - name: Update floating MAJOR tag
        run: |
          git tag -f ${{ steps.version.outputs.major_tag }} ${{ steps.version.outputs.new_tag }}
          git push origin ${{ steps.version.outputs.major_tag }} --force

      - name: Create GitHub release
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          # Generate release body from commit history since last tag
          PREV_TAG=$(git describe --tags --abbrev=0 HEAD^ 2>/dev/null || echo "")
          if [ -n "$PREV_TAG" ]; then
            BODY=$(git log --format='- %s' "$PREV_TAG"..HEAD)
          else
            BODY=$(git log --format='- %s' HEAD)
          fi
          gh release create ${{ steps.version.outputs.new_tag }} \
            --title "Nova ${{ steps.version.outputs.new_tag }}" \
            --notes "$BODY" \
            --generate-notes || true