name: Publish Master Branch to NPM

on:
    workflow_dispatch:
    # Nightly run at 02:00 UTC
    schedule:
        - cron: '0 2 * * *'

jobs:
    publish:
        runs-on: ubuntu-latest
        permissions:
            contents: read
            id-token: write

        # Only allow workflow to run on master branch
        if: github.ref == 'refs/heads/master'

        steps:
            - name: Checkout
              uses: actions/checkout@v4
              with:
                  fetch-depth: 0

            # Check if branch received commits in the last 24 h; skip remainder if none
            - name: Check for new commits
              id: commit_check
              run: |
                  # Count commits since 24 h ago on this branch
                  COMMITS=$(git rev-list --count --since="24 hours" HEAD)
                  echo "Commits found: $COMMITS"
                  if [ "$COMMITS" -eq 0 ]; then
                      echo "should_publish=false" >> $GITHUB_OUTPUT
                  else
                      echo "should_publish=true" >> $GITHUB_OUTPUT
                  fi

            - name: Setup Node.js
              if: ${{ steps.commit_check.outputs.should_publish == 'true' }}
              uses: actions/setup-node@v4
              with:
                  node-version: '22.x'
                  registry-url: 'https://registry.npmjs.org'

            - name: Install dependencies
              if: ${{ steps.commit_check.outputs.should_publish == 'true' }}
              run: npm install --no-save

            - name: Get current date
              if: ${{ steps.commit_check.outputs.should_publish == 'true' }}
              id: date
              run: echo "date=$(date +'%Y%m%d%H%M')" >> $GITHUB_OUTPUT

            - name: Configure Git
              if: ${{ steps.commit_check.outputs.should_publish == 'true' }}
              run: |
                  git config --global user.email "41898282+github-actions[bot]@users.noreply.github.com"
                  git config --global user.name "github-actions[bot]"

            - name: Version and build packages
              if: ${{ steps.commit_check.outputs.should_publish == 'true' }}
              run: |
                  # Get current version from lerna.json
                  CURRENT_VERSION=$(node -p "require('./lerna.json').version")
                  IFS='.' read -r -a VERSION_PARTS <<< "$CURRENT_VERSION"
                  # Increment patch version for pre-release
                  PATCH=$((VERSION_PARTS[2] + 1))
                  # Compose new pre-release version incl. timestamp
                  NEW_VERSION="${VERSION_PARTS[0]}.${VERSION_PARTS[1]}.${PATCH}-master-${{ steps.date.outputs.date }}"
                  npx lerna version $NEW_VERSION --no-git-tag-version --yes --no-push --force-publish

            - name: Commit changes
              if: ${{ steps.commit_check.outputs.should_publish == 'true' }}
              run: |
                  git add .
                  git commit -m "chore: Bump version for pre-release to $NEW_VERSION"

            - name: Publish to NPM
              if: ${{ steps.commit_check.outputs.should_publish == 'true' }}
              run: npx lerna publish from-package --yes --dist-tag master --no-git-reset
              env:
                  NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
                  NPM_CONFIG_PROVENANCE: true

            # Informative noop when skipping
            - name: Skip publish
              if: ${{ steps.commit_check.outputs.should_publish == 'false' }}
              run: echo "No new commits in last 24 hours – skipping publish."