action.yml

name: 'Pacta Architecture Review'
description: 'Run architecture checks and post a rich PR comment describing architectural changes'
branding:
  icon: 'layers'
  color: 'blue'

inputs:
  target_dir:
    description: 'Repository root (default: .)'
    required: false
    default: '.'
  model:
    description: 'Path to architecture.yml'
    required: false
    default: 'architecture.yml'
  rules:
    description: 'Path to rules.pacta.yml'
    required: false
    default: 'rules.pacta.yml'
  baseline:
    description: 'Baseline ref name (omit to skip baseline comparison)'
    required: false
    default: ''
  python-version:
    description: 'Python version to use'
    required: false
    default: '3.11'
  fail-on-violations:
    description: 'Fail the check if new violations are found'
    required: false
    default: 'true'
  pacta-version:
    description: 'Pacta version to install (PyPI spec, default: pacta)'
    required: false
    default: 'pacta'

runs:
  using: 'composite'
  steps:
    - uses: actions/setup-python@v5
      with:
        python-version: ${{ inputs.python-version }}

    - name: Install Pacta
      shell: bash
      run: pip install "${{ inputs.pacta-version }}"

    - name: Run Architecture Check
      id: pacta
      shell: bash
      run: |
        ARGS="--model ${{ inputs.model }} --rules ${{ inputs.rules }}"
        if [ -n "${{ inputs.baseline }}" ]; then
          ARGS="$ARGS --baseline ${{ inputs.baseline }}"
        fi

        # Generate GitHub Markdown comment
        pacta scan ${{ inputs.target_dir }} $ARGS --format github > "$RUNNER_TEMP/pacta-comment.md" || true

        # Generate JSON for machine-readable results
        pacta scan ${{ inputs.target_dir }} $ARGS --format json > "$RUNNER_TEMP/pacta-results.json" || true

        # Extract new violation count
        NEW=$(jq '.summary.by_status.new // 0' "$RUNNER_TEMP/pacta-results.json" 2>/dev/null || echo 0)
        echo "new_violations=$NEW" >> "$GITHUB_OUTPUT"

    - name: Post or Update PR Comment
      if: github.event_name == 'pull_request'
      uses: actions/github-script@v7
      with:
        script: |
          const fs = require('fs');
          const commentPath = '${{ runner.temp }}/pacta-comment.md';
          const body = fs.readFileSync(commentPath, 'utf8');
          const marker = '<!-- pacta-architecture-report -->';
          const fullBody = marker + '\n' + body;

          // Find existing comment to update (idempotent)
          const { data: comments } = await github.rest.issues.listComments({
            owner: context.repo.owner,
            repo: context.repo.repo,
            issue_number: context.issue.number,
          });
          const existing = comments.find(c => c.body.startsWith(marker));

          if (existing) {
            await github.rest.issues.updateComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              comment_id: existing.id,
              body: fullBody,
            });
          } else {
            await github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number,
              body: fullBody,
            });
          }

    - name: Fail on New Violations
      if: inputs.fail-on-violations == 'true' && steps.pacta.outputs.new_violations != '0'
      shell: bash
      run: |
        echo "::error::Pacta found ${{ steps.pacta.outputs.new_violations }} new architectural violation(s)"
        exit 1