name: Backward Compatibility Check
run-name: Backward Compatibility Check - ${{ github.event.pull_request.title || github.ref_name }}
on:
  pull_request:
    types: [opened, reopened, synchronize]
    branches:
      - "release-*"
      - "main"

jobs:
  compatibility-check:
    name: Check Backward Compatibility
    runs-on: ubuntu-latest
    permissions:
      contents: read
      pull-requests: write
    steps:
    - uses: actions/checkout@v4
      with:
        fetch-depth: 0

    - name: Set up Python
      uses: actions/setup-python@v4
      with:
        python-version: '3.9'

    - name: Install dependencies
      run: |
        pip install PyYAML requests

    - name: Run compatibility check
      id: compat-check
      run: |
        python ci/check-backward-compatibility.py
      env:
        PR_NUMBER: ${{ github.event.number }}
        BASE_SHA: ${{ github.event.pull_request.base.sha }}
        HEAD_SHA: ${{ github.event.pull_request.head.sha }}

    - name: Add comment
      uses: actions/github-script@v7
      with:
        script: |
          const fs = require('fs');

          // Read results from the compatibility check
          let results = {};
          try {
            results = JSON.parse(fs.readFileSync('/tmp/compat-results.json', 'utf8'));
          } catch (error) {
            console.log('No compatibility results found');
            return;
          }

          // Add comment with detailed findings
          if (results.length > 0) {
            const comment = `## Potential Backward Compatibility Issues Detected

          This PR contains changes that may break backward compatibility:

          ${results.map(change => `- **${change.type}**: ${change.description}\n  - File: \`${change.file}\`\n  - ${change.details || ''}`).join('\n')}

          Please review these changes carefully before merging.`;

            await github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.payload.pull_request.number,
              body: comment
            });
          }