name: PR Pipeline — Authorize → Validate → Review → Merge
on:
  push:
    branches: [master]
    paths:
      - '**.prose.md'
      - 'scripts/**.sh'
      - '**.yaml'
      - '**.yml'
  pull_request:
    types: [opened, synchronize, reopened]
    paths:
      - '**.prose.md'
      - 'scripts/**.sh'
      - '**.yaml'
      - '**.yml'

jobs:
  auth:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Authorization check
        run: bash scripts/prose-auth-check.sh

  validate:
    runs-on: ubuntu-latest
    needs: auth
    steps:
      - uses: actions/checkout@v4

      - name: YAML frontmatter validation
        run: |
          echo "=== Prose Contract Frontmatter Validation ==="
          FAILED=0
          for f in $(find . -name "*.prose.md" -not -path "./.git/*" -not -path "./runs/*"); do
            FM=$(sed -n '/^---$/,/^---$/p' "$f" | sed '1d;$d')
            [ -z "$FM" ] && { echo "  ❌ $f: No YAML frontmatter"; FAILED=1; continue; }

            KIND=$(echo "$FM" | grep '^kind:' | awk '{print $2}')
            case "$KIND" in
              function|responsibility|gateway|pattern|test|template|architecture) echo "  ✅ $f: kind=$KIND" ;;
              *) echo "  ❌ $f: Invalid kind='$KIND'"; FAILED=1 ;;
            esac

            echo "$FM" | grep -q '^name:' || { echo "  ❌ $f: Missing name"; FAILED=1; }
            echo "$FM" | grep -q '^description:' || { echo "  ❌ $f: Missing description"; FAILED=1; }
          done
          [ $FAILED -eq 1 ] && { echo "❌ FRONTMATTER FAILED"; exit 1; }
          echo "✅ Frontmatter validation passed"

  lint:
    runs-on: ubuntu-latest
    needs: validate
    steps:
      - uses: actions/checkout@v4

      - name: Structure + regression + consistency lint
        run: bash scripts/prose-lint.sh

  ai-review:
    runs-on: ubuntu-latest
    needs: validate
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: AI-powered contract review
        env:
          LITELLM_URL: ${{ secrets.LITELLM_URL }}
          LITELLM_KEY: ${{ secrets.LITELLM_KEY }}
        run: bash scripts/prose-ai-review.sh

  gate:
    runs-on: ubuntu-latest
    needs: [auth, validate, lint, ai-review]
    if: success()
    steps:
      - name: Merge gate
        run: |
          echo "╔══════════════════════════════════════╗"
          echo "║  ALL CHECKS PASSED — SAFE TO MERGE  ║"
          echo "╚══════════════════════════════════════╝"
          echo ""
          echo "  ✅ auth       — authorized agent"
          echo "  ✅ validate   — frontmatter valid"
          echo "  ✅ lint       — structure + no regressions"
          echo "  ✅ ai-review  — no contradictions with ground truth"
          echo ""
          echo "Merge this PR to deploy to main."