name: CI

on:
  push:
  pull_request:
  workflow_dispatch:

env:
  DEPS: libgit2-dev libjson-c-dev libsodium-dev libsqlite3-dev python3-pytest

jobs:
  lint:
    runs-on: ubuntu-latest
    name: Linting
    continue-on-error: ${{ github.ref != 'refs/heads/master' }}
    steps:
      - name: Checkout
        uses: actions/checkout@v3
      - name: Run clang-format
        uses: egor-tensin/clang-format@v1

  build:
    strategy:
      matrix:
        compiler: [gcc, clang]
        configuration: [Debug, Release]
    runs-on: ubuntu-latest
    name: 'Build: ${{ matrix.compiler }} / ${{ matrix.configuration }}'
    env:
      COMPILER: '${{ matrix.compiler }}'
      CONFIGURATION: '${{ matrix.configuration }}'
    steps:
      - name: Checkout
        uses: actions/checkout@v3
      - name: Install dependencies
        run: |
          sudo apt-get update
          sudo DEBIAN_FRONTEND=noninteractive apt-get install -yq --no-install-recommends $DEPS valgrind
      - name: Build
        run: make install
      - name: Upload binaries
        uses: actions/upload-artifact@v3
        with:
          name: 'cimple-${{ matrix.compiler }}-${{ matrix.configuration }}'
          path: './build/install/'
          if-no-files-found: error
      - name: Run tests
        run: make test
      - name: Run Valgrind tests
        run: make test/valgrind

  coverage:
    needs: [build]
    runs-on: ubuntu-latest
    name: 'Code coverage & flame graphs'
    steps:
      - name: Checkout
        uses: actions/checkout@v3
      - name: Install dependencies
        run: |
          sudo apt-get update
          sudo DEBIAN_FRONTEND=noninteractive apt-get install -yq --no-install-recommends $DEPS gcovr
      - name: Install FlameGraph
        run: |
          git clone --depth 1 https://github.com/brendangregg/FlameGraph.git ~/FlameGraph
          echo ~/FlameGraph >> "$GITHUB_PATH"
      - name: Enable profiling
        run: |
          echo -1 | sudo tee /proc/sys/kernel/perf_event_paranoid
      - name: Generate coverage report
        run: |
          make coverage
          mkdir -p /tmp/out/
          cp -r ./build/coverage/ /tmp/out/
      - name: Upload report
        uses: actions/upload-artifact@v3
        with:
          name: coverage
          path: ./build/coverage/
          if-no-files-found: error
      - name: Clean up
        run: make clean
      - name: Build
        run: make install
      - name: Make flame graphs
        run: |
          # sudo is used to resolve kernel symbols. Plus, it would be required
          # if we didn't fix perf_event_paranoid. PATH needs to be preserved
          # for FlameGraph.
          sudo --preserve-env=PATH make flame_graphs
          mkdir -p /tmp/out/
          cp -r ./build/flame_graphs/ /tmp/out/
      - name: Upload flame graphs
        uses: actions/upload-artifact@v3
        with:
          name: flame_graphs
          path: ./build/flame_graphs/
          if-no-files-found: error
      - name: Publish to GitHub Pages
        uses: JamesIves/github-pages-deploy-action@v4
        with:
          folder: /tmp/out/
          single-commit: true
        if: github.ref == 'refs/heads/master'

  publish:
    needs: [lint, build]
    runs-on: ubuntu-latest
    name: 'Docker: publish'
    steps:
      - name: Checkout
        uses: actions/checkout@v3
      - name: Set up QEMU
        uses: docker/setup-qemu-action@v2
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v2
      - name: Login to Docker Hub
        uses: docker/login-action@v2
        with:
          username: '${{ secrets.DOCKERHUB_USERNAME }}'
          password: '${{ secrets.DOCKERHUB_TOKEN }}'
      - id: platforms
        name: Which platforms?
        # Building for ARM for every commit not in master is too time-consuming.
        run: |
          if [ '${{ github.ref }}' = 'refs/heads/master' ]; then
              echo 'platforms=amd64,armhf,arm64' >> "$GITHUB_OUTPUT"
          else
              echo 'platforms=amd64' >> "$GITHUB_OUTPUT"
          fi
      - name: Publish
        uses: docker/build-push-action@v3
        with:
          # Without context, .dockerignore is not respected?
          # https://stackoverflow.com/a/74552407/514684
          context: .
          platforms: '${{ steps.platforms.outputs.platforms }}'
          push: ${{ github.ref == 'refs/heads/master' }}
          tags: '${{ secrets.DOCKERHUB_USERNAME }}/cimple:latest'