# PR validation: security gates + lint + full test suite. Builds, smoke and
# soak stay maintainer-driven via the dry-run workflow_dispatch. Branch
# protection requires `dco` + `ci-ok` — a single stable summary context that
# fails unless every PR stage succeeded.
name: PR

on:
  pull_request:
    branches: [main]

permissions:
  contents: read
  pull-requests: read

# A new push to the PR supersedes the running validation — cancel it
# instead of stacking zombie pipelines.
concurrency:
  group: pr-${{ github.event.pull_request.number }}
  cancel-in-progress: true


jobs:
  security:
    uses: ./.github/workflows/_security.yml
    secrets: inherit

  lint:
    uses: ./.github/workflows/_lint.yml

  test:
    needs: [lint]
    if: ${{ !cancelled() && needs.lint.result == 'success' }}
    uses: ./.github/workflows/_test.yml
    with:
      # Perf assertions are timing-sensitive on shared runners; they stay in
      # dry runs and releases where a flaky red does not block a merge.
      skip_perf: true

  # ── Which files changed? Gate the (heavier) build+smoke on product code so
  #    docs / CI / test-only PRs stay fast. ──
  changes:
    runs-on: ubuntu-latest
    timeout-minutes: 5
    outputs:
      product: ${{ steps.f.outputs.product }}
    steps:
      - name: Detect product-code changes
        id: f
        env:
          GH_TOKEN: ${{ github.token }}
          PR: ${{ github.event.pull_request.number }}
          REPO: ${{ github.repository }}
        run: |
          FILES=$(gh pr diff "$PR" --repo "$REPO" --name-only)
          printf '%s\n' "$FILES"
          if printf '%s\n' "$FILES" | grep -qE '^(src/|internal/|scripts/build\.sh|scripts/smoke-test\.sh|scripts/env\.sh|Makefile\.cbm)'; then
            echo "product=true" >> "$GITHUB_OUTPUT"
          else
            echo "product=false" >> "$GITHUB_OUTPUT"
          fi

  # ── Light smoke: build the PRODUCTION binary and run the core smoke on the
  #    three RELIABLE NATIVE platforms. Catches built-binary regressions at PR
  #    time (e.g. the Windows CreateProcess argv-quoting class that previously
  #    only surfaced in the release dry run). The full broad/emulated smoke stays
  #    in the dry run. Only product-code PRs pay this; every leg gates.
  #    SMOKE_DOWNLOAD_URL is intentionally unset — the download/update phases of
  #    smoke-test.sh self-skip; the core index/search/trace phases still run. ──
  pr-smoke:
    needs: [changes]
    if: ${{ !cancelled() && needs.changes.outputs.product == 'true' }}
    strategy:
      fail-fast: false
      matrix:
        os: [ubuntu-latest, macos-14, windows-latest]
    runs-on: ${{ matrix.os }}
    timeout-minutes: 30
    steps:
      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0

      - name: Install deps (Ubuntu)
        if: matrix.os == 'ubuntu-latest'
        run: sudo apt-get update && sudo apt-get install -y zlib1g-dev

      - uses: msys2/setup-msys2@66cd2cce69caa17b53920067426061ca1de3a884 # v2
        if: matrix.os == 'windows-latest'
        with:
          msystem: CLANG64
          path-type: inherit
          install: >-
            mingw-w64-clang-x86_64-clang
            mingw-w64-clang-x86_64-zlib
            mingw-w64-clang-x86_64-python3
            make
            coreutils

      - name: Build prod + smoke (Ubuntu)
        if: matrix.os == 'ubuntu-latest'
        run: |
          scripts/build.sh CC=gcc CXX=g++
          scripts/smoke-test.sh "$(pwd)/build/c/codebase-memory-mcp"

      - name: Build prod + smoke (macOS)
        if: matrix.os == 'macos-14'
        run: |
          scripts/build.sh CC=cc CXX=c++
          codesign --sign - --force build/c/codebase-memory-mcp
          scripts/smoke-test.sh "$(pwd)/build/c/codebase-memory-mcp"

      - name: Build prod + smoke (Windows)
        if: matrix.os == 'windows-latest'
        shell: msys2 {0}
        run: |
          scripts/build.sh CC=clang CXX=clang++
          BIN="$(pwd)/build/c/codebase-memory-mcp"
          [ -f "${BIN}.exe" ] && BIN="${BIN}.exe"
          scripts/smoke-test.sh "$BIN"

  ci-ok:
    # The one required context (besides dco) — fails unless every PR stage
    # succeeded, so matrix renames can never silently deadlock merges. `skipped`
    # is OK: pr-smoke skips on docs/CI/test-only PRs (changes.product == false).
    needs: [security, lint, test, changes, pr-smoke]
    if: ${{ always() }}
    runs-on: ubuntu-latest
    timeout-minutes: 5
    steps:
      - name: All PR stages must have succeeded
        env:
          RESULTS: ${{ toJSON(needs) }}
        run: |
          echo "$RESULTS" | python3 -c "
          import json, sys
          needs = json.load(sys.stdin)
          bad = {k: v['result'] for k, v in needs.items() if v['result'] not in ('success', 'skipped')}
          if bad:
              print('CI NOT OK:', bad)
              sys.exit(1)
          print('CI OK:', ', '.join(needs))
          "