name: Freshness Check
on:
  schedule:
    - cron: '0 8 * * 1'  # Weekly, Monday 08:00 UTC
  workflow_dispatch:

jobs:
  check:
    runs-on: ubuntu-latest
    permissions:
      issues: write

    steps:
      - uses: actions/checkout@v4

      - uses: actions/setup-node@v4
        with:
          node-version: '22'
          cache: 'npm'

      - run: npm ci

      - name: Check freshness
        id: freshness
        run: |
          npm run freshness:check
          echo "stale=$(cat .freshness-stale)" >> $GITHUB_OUTPUT

      - name: Create issue if stale
        if: steps.freshness.outputs.stale == 'true'
        uses: actions/github-script@v7
        with:
          script: |
            const fs = require('fs');
            const summary = fs.readFileSync('.freshness-report', 'utf8');
            const existing = await github.rest.issues.listForRepo({
              owner: context.repo.owner,
              repo: context.repo.repo,
              labels: 'data-freshness',
              state: 'open'
            });
            if (existing.data.length === 0) {
              await github.rest.issues.create({
                owner: context.repo.owner,
                repo: context.repo.repo,
                title: `Data staleness alert - ${new Date().toISOString().split('T')[0]}`,
                body: summary,
                labels: ['data-freshness', 'automated']
              });
            }