name: Bump Hugo Version

on:
  # Run every 3 hours
  schedule:
    - cron: "0 */3 * * *"
  # Allow manual trigger
  workflow_dispatch:

permissions:
  contents: write
  pull-requests: write

jobs:
  bump:
    name: Bump to latest Hugo version
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v6
        with:
          fetch-depth: 0

      - name: Setup Node.js
        uses: actions/setup-node@v6
        with:
          node-version: "24"

      - name: Get current package version
        id: current
        run: |
          CURRENT_VERSION=$(node -p "require('./package.json').version")
          echo "version=$CURRENT_VERSION" >> $GITHUB_OUTPUT
          echo "Current package version: $CURRENT_VERSION"

      - name: Get latest Hugo release
        id: hugo
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          # Fetch latest release from Hugo repo (excludes prereleases by default)
          LATEST_RELEASE=$(gh api repos/gohugoio/hugo/releases/latest --jq '.tag_name')
          # Remove 'v' prefix if present
          LATEST_VERSION="${LATEST_RELEASE#v}"
          echo "version=$LATEST_VERSION" >> $GITHUB_OUTPUT
          echo "Latest Hugo version: $LATEST_VERSION"

      - name: Check if update is needed
        id: check
        run: |
          CURRENT="${{ steps.current.outputs.version }}"
          LATEST="${{ steps.hugo.outputs.version }}"

          if [ "$CURRENT" = "$LATEST" ]; then
            echo "Already up to date with Hugo v$LATEST"
            echo "needs_update=false" >> $GITHUB_OUTPUT
          else
            echo "New Hugo version available: v$LATEST (current: v$CURRENT)"
            echo "needs_update=true" >> $GITHUB_OUTPUT
          fi

      - name: Check if PR already exists
        id: pr_check
        if: steps.check.outputs.needs_update == 'true'
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          LATEST="${{ steps.hugo.outputs.version }}"
          BRANCH_NAME="autobump-hugo-v${LATEST}"

          # Check if a PR for this version already exists
          EXISTING_PR=$(gh pr list --head "$BRANCH_NAME" --json number --jq '.[0].number // empty')

          if [ -n "$EXISTING_PR" ]; then
            echo "PR #$EXISTING_PR already exists for Hugo v$LATEST"
            echo "pr_exists=true" >> $GITHUB_OUTPUT
          else
            echo "No existing PR found for Hugo v$LATEST"
            echo "pr_exists=false" >> $GITHUB_OUTPUT
          fi

      - name: Configure Git
        if: steps.check.outputs.needs_update == 'true' && steps.pr_check.outputs.pr_exists == 'false'
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"

      - name: Create branch and bump version
        if: steps.check.outputs.needs_update == 'true' && steps.pr_check.outputs.pr_exists == 'false'
        run: |
          LATEST="${{ steps.hugo.outputs.version }}"
          BRANCH_NAME="autobump-hugo-v${LATEST}"

          # Create new branch
          git checkout -b "$BRANCH_NAME"

          # Use npm version to properly bump (updates package.json and package-lock.json)
          # --no-git-tag-version prevents creating a tag, we'll let the publish workflow handle that
          npm version "$LATEST" --no-git-tag-version

          # Stage package files
          git add package.json package-lock.json

      - name: Commit and push
        if: steps.check.outputs.needs_update == 'true' && steps.pr_check.outputs.pr_exists == 'false'
        run: |
          LATEST="${{ steps.hugo.outputs.version }}"
          BRANCH_NAME="autobump-hugo-v${LATEST}"

          git commit -m "chore: bump to Hugo v${LATEST}"
          git push origin "$BRANCH_NAME"

      - name: Create Pull Request
        if: steps.check.outputs.needs_update == 'true' && steps.pr_check.outputs.pr_exists == 'false'
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          LATEST="${{ steps.hugo.outputs.version }}"
          BRANCH_NAME="autobump-hugo-v${LATEST}"

          gh pr create \
            --title "chore: bump to Hugo v${LATEST}" \
            --body "## 🚀 New Hugo Release

          This PR updates the package to match **Hugo v${LATEST}**.

          ### Changes
          - Bumped package version to \`${LATEST}\`

          Type definitions and flag specs will be regenerated automatically during CI and publish.

          ### Hugo Release
          📦 [Hugo v${LATEST} Release Notes](https://github.com/gohugoio/hugo/releases/tag/v${LATEST})

          ---
          *This PR was automatically created by the [Bump Hugo Version](${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}) workflow.*" \
            --head "$BRANCH_NAME" \
            --base main