name: Sync Upstream Skills

on:
  schedule:
    # Weekly: Sunday 06:00 UTC
    - cron: '0 6 * * 0'
  push:
    branches: [main]
  workflow_dispatch:

jobs:
  sync:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout from Gitea
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          token: ${{ secrets.GITEA_TOKEN }}

      - name: Add upstream remote
        run: |
          git remote add upstream https://github.com/obra/superpowers.git
          git fetch upstream --depth=1

      - name: Sync selected skills
        id: sync
        run: |
          SKILLS="
            systematic-debugging
            test-driven-development
            verification-before-completion
            writing-plans
            requesting-code-review
            receiving-code-review
            finishing-a-development-branch
          "

          CHANGED=false
          for skill in $SKILLS; do
            diff_files=$(git diff --name-only HEAD upstream/main -- "skills/$skill" 2>/dev/null || true)
            if [ -n "$diff_files" ]; then
              echo "Updating skills/$skill..."
              git checkout upstream/main -- "skills/$skill"
              git add "skills/$skill"
              CHANGED=true
            fi
          done

          if [ "$CHANGED" = true ]; then
            echo "changed=true" >> $GITHUB_OUTPUT
          else
            echo "changed=false" >> $GITHUB_OUTPUT
          fi

      - name: Commit and push
        if: steps.sync.outputs.changed == 'true'
        run: |
          git config user.name "gitea-actions[bot]"
          git config user.email "gitea-actions@git.vpsj.de"

          UPSTREAM_SHA=$(git rev-parse --short upstream/main)
          git commit -m "Sync skills from obra/superpowers upstream (${UPSTREAM_SHA})"
          git push origin main