# Byte-identity guard for files shared with the sibling library anbani.py.
# These files are copied verbatim between the two repos; this job fails if they
# drift. For a coordinated change to a shared file (landing in both repos at
# once), add the `parity-pending` label to skip this job while the pair is
# in flight.
name: parity

on:
  push:
    branches: [master]
  pull_request:

jobs:
  parity:
    runs-on: ubuntu-latest
    if: ${{ !contains(github.event.pull_request.labels.*.name, 'parity-pending') }}
    steps:
      - name: Checkout self (anbani.js)
        uses: actions/checkout@v4
        with:
          path: self

      - name: Checkout sibling (anbani.py default branch)
        uses: actions/checkout@v4
        with:
          repository: Anbani/anbani.py
          path: sibling

      - name: Byte-compare shared files
        shell: bash
        run: |
          # self path (this repo)  ->  sibling path (anbani.py)
          pairs="
          src/lib/data.mjs|anbani/data/letters.js
          data/georgian_contractions.csv|anbani/data/georgian_contractions.csv
          data/ambigram_nc5_len7.csv|anbani/data/ambigram_nc5_len7.csv
          spec/golden.json|spec/golden.json
          "
          fail=0
          while IFS='|' read -r a b; do
            [ -z "$a" ] && continue
            if [ ! -f "sibling/$b" ]; then
              echo "::warning::sibling missing anbani.py:$b — skipping (bootstrap window)"
              continue
            fi
            if cmp -s "self/$a" "sibling/$b"; then
              echo "ok: $a == anbani.py:$b"
            else
              echo "::error::DRIFT: $a differs from anbani.py:$b"
              fail=1
            fi
          done <<< "$pairs"
          exit $fail