name: Sync planet-scale guide to the website

# The guide's source lives here (docs/planet-scale-guide/ — see its own
# README.html), since keeping it next to the code it documents is what keeps
# it honest. This mirrors it into the public elevenmessenger/website repo
# (src/infrastructure/, passthrough-copied by Eleventy — see .eleventy.js
# there) so it's reachable at elevenmessenger.com/infrastructure/ too,
# without ever duplicating the source by hand. A push to website's main
# branch triggers its own existing deploy.yml automatically.

on:
  push:
    branches: [main]
    paths:
      - 'docs/planet-scale-guide/**'
  workflow_dispatch:

concurrency:
  group: sync-guide-to-website
  cancel-in-progress: false

jobs:
  sync:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout the guide source
        uses: actions/checkout@v4
        with:
          sparse-checkout: docs/planet-scale-guide
          sparse-checkout-cone-mode: true
          # Read-only source checkout; the push below uses the website
          # checkout's own WEBSITE_REPO_TOKEN, not this credential.
          persist-credentials: false

      - name: Check for the website repo token
        id: check-token
        run: |
          if [ -z "${{ secrets.WEBSITE_REPO_TOKEN }}" ]; then
            echo "skip=true" >> "$GITHUB_OUTPUT"
            echo "::warning::WEBSITE_REPO_TOKEN secret not set — skipping guide sync. See docs/planet-scale-guide/README.html § Publishing to elevenmessenger.com."
          else
            echo "skip=false" >> "$GITHUB_OUTPUT"
          fi

      - name: Checkout elevenmessenger/website
        if: steps.check-token.outputs.skip != 'true'
        uses: actions/checkout@v4
        with:
          repository: elevenmessenger/website
          token: ${{ secrets.WEBSITE_REPO_TOKEN }}
          path: website

      - name: Copy the guide into website's passthrough directory
        if: steps.check-token.outputs.skip != 'true'
        run: |
          rm -rf website/src/infrastructure
          mkdir -p website/src/infrastructure
          cp -r docs/planet-scale-guide/* website/src/infrastructure/

      - name: Commit and push if the guide changed
        if: steps.check-token.outputs.skip != 'true'
        working-directory: website
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"
          git add src/infrastructure
          if git diff --cached --quiet; then
            echo "No changes to the guide — nothing to sync."
          else
            git commit -m "docs: sync planet-scale guide from elevenmessenger/messenger@${GITHUB_SHA::7}"
            git push
          fi