name: Documentation Drift Check

on:
  pull_request:
    types: [opened, synchronize, reopened]

permissions:
  contents: read
  pull-requests: write

jobs:
  check-docs-drift:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Set up Node.js
        uses: actions/setup-node@v4
        with:
          node-version: "18"

      - name: Run documentation drift detection
        env:
          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
          PR_BASE_SHA: ${{ github.event.pull_request.base.sha }}
          PR_HEAD_SHA: ${{ github.event.pull_request.head.sha }}
        run: |
          node .github/scripts/detect_docs_drift.js

      - name: Read drift count
        id: drift_count
        run: |
          COUNT=$(cat docs_drift_count.txt)
          echo "count=$COUNT" >> $GITHUB_OUTPUT

      - name: Publish summary
        if: always()
        run: |
          cat docs_drift_report.md >> $GITHUB_STEP_SUMMARY

      - name: Fail if documentation drift detected
        if: steps.drift_count.outputs.count != '0'
        run: |
          echo "❌ Documentation drift detected: ${{ steps.drift_count.outputs.count }} suggestion(s)"
          exit 1

      - name: Success message
        if: steps.drift_count.outputs.count == '0'
        run: |
          echo "✅ No documentation drift detected"