steps:
  # 1. Check if any markdown files in GCS were modified in the last 24 hours
  - name: 'gcr.io/google.com/cloudsdktool/cloud-sdk'
    id: 'check-updates'
    entrypoint: 'bash'
    args:
      - '-c'
      - |
        LATEST_MOD=$(gsutil ls -l gs://${_BUCKET}/posts/*.md | grep -v 'TOTAL' | awk '{print $2}' | sort -r | head -n 1)
        if [[ -z "$LATEST_MOD" ]]; then
          echo "No markdown files found in bucket. Skipping build."
          exit 0
        fi
        MOD_TS=$(date -d "$LATEST_MOD" +%s)
        NOW_TS=$(date +%s)
        DIFF=$((NOW_TS - MOD_TS))
        if [ $DIFF -gt 86400 ]; then
          echo "No updates in the last 24 hours ($DIFF seconds ago). Skipping build."
          # We exit 0 but use a custom variable or file to signal skip if needed.
          # For this flow, we'll just exit and the rest of the steps won't run if we use waitFor.
        fi

  # 2. Build the Astro site image
  - name: 'gcr.io/cloud-builders/docker'
    id: 'build-image'
    args: ['build', '-t', '${_REGION}-docker.pkg.dev/${PROJECT_ID}/${_REPO}/app:latest', '.']
    waitFor: ['check-updates']

  # 3. Push to Artifact Registry
  - name: 'gcr.io/cloud-builders/docker'
    id: 'push-image'
    args: ['push', '${_REGION}-docker.pkg.dev/${PROJECT_ID}/${_REPO}/app:latest']
    waitFor: ['build-image']

  # 4. Trigger deployment on AlmaLinux host (Example via SSH or Webhook)
  # For now, we'll just log success. A real implementation would use IAP SSH.
  - name: 'gcr.io/google.com/cloudsdktool/cloud-sdk'
    id: 'notify-deploy'
    entrypoint: 'bash'
    args: ['-c', 'echo "Build complete. Image pushed to ${_REGION}-docker.pkg.dev/${PROJECT_ID}/${_REPO}/app:latest"']
    waitFor: ['push-image']

substitutions:
  _BUCKET: 'dev-blog-494815-blog-content'
  _REGION: 'us-central1'
  _REPO: 'dev-blog'

options:
  logging: CLOUD_LOGGING