name: Demo Snapshot Parity

on:
  workflow_dispatch:
    inputs:
      snapshot-dir:
        description: 'Snapshot export directory (default: /tmp/demo-parity)'
        required: false
        default: '/tmp/demo-parity'

jobs:
  parity:
    runs-on: ubuntu-latest
    env:
      NODE_OPTIONS: '--max-old-space-size=4096'
      SEQUELIZE_CLS: cls-hooked
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Setup Node
        uses: actions/setup-node@v4
        with:
          node-version: '20.20.0'
          cache: npm

      - name: Install root dependencies
        run: npm ci

      - name: Build local tarball for demos
        run: |
          mkdir -p demos/_artifacts
          npm pack --pack-destination demos/_artifacts
          cp demos/_artifacts/sequelize-paper-trail-*.tgz demos/_artifacts/sequelize-paper-trail-local.tgz

      - name: Install demo dependencies
        run: |
          for demo in baseline v5 v6; do
            rm -f "demos/${demo}/package-lock.json"
            (cd "demos/${demo}" && npm install --no-package-lock)
          done

      - name: Export baseline snapshots
        run: DB_SNAPSHOT_DIR=${{ inputs.snapshot-dir }} npm run test:export
        working-directory: demos/baseline

      - name: Export v5 snapshots
        run: DB_SNAPSHOT_DIR=${{ inputs.snapshot-dir }} npm run test:export
        working-directory: demos/v5

      - name: Export v6 snapshots
        run: DB_SNAPSHOT_DIR=${{ inputs.snapshot-dir }} npm run test:export
        working-directory: demos/v6

      - name: Compare snapshots
        run: |
          python - <<'PY'
          import json
          import pathlib

          root = pathlib.Path('${{ inputs.snapshot-dir }}')
          if not root.exists():
              raise SystemExit('snapshot root missing')

          dirs = {p.name: p for p in root.iterdir() if p.is_dir()}
          files_by_dir = {}
          for name, d in dirs.items():
              files = {p.name: p for p in d.glob('*.json')}
              files_by_dir[name] = files

          common = None
          for files in files_by_dir.values():
              names = set(files)
              common = names if common is None else common & names
          common = common or set()

          mismatches = []
          for fname in sorted(common):
              base = None
              for name, files in files_by_dir.items():
                  path = files[fname]
                  data = json.loads(path.read_text())
                  if base is None:
                      base = data
                  elif data != base:
                      mismatches.append((fname, name))
                      break

          if mismatches:
              raise SystemExit(f'mismatches found: {mismatches[:5]}')

          for name, files in files_by_dir.items():
              extras = set(files) - common
              print(f'extras in {name}: {len(extras)}')

          print(f'common files: {len(common)}; mismatches: {len(mismatches)}')
          PY