name: Sandbox - cmake + ccache on the pool
on:
  push:
    branches: [ci/sandbox]
  workflow_dispatch:

env:
  # Inside the workspace so actions/cache can store it. The path is identical on
  # every run, which matters because ccache hashes the compiler command line.
  CCACHE_DIR: ${{ github.workspace }}/.ccache

jobs:
  build:
    runs-on: cmake
    defaults:
      run:
        shell: bash
        working-directory: sandbox_c
    steps:
      - uses: actions/checkout@v4

      - name: Toolchain
        run: |
          set -euo pipefail
          command -v cmake >/dev/null && command -v ccache >/dev/null && exit 0
          apt-get update -qq
          apt-get install -y -qq --no-install-recommends \
            cmake ninja-build gcc libc6-dev ccache ca-certificates >/dev/null
          cmake --version | head -1
          ccache --version | head -1

      # Cache the compiler cache, never build/: CMake bakes absolute paths into
      # CMakeCache.txt, so a restored build tree breaks if the workspace moves.
      - name: Cache ccache
        uses: actions/cache@v4
        with:
          path: ${{ env.CCACHE_DIR }}
          key: ccache-${{ hashFiles('sandbox_c/**') }}
          restore-keys: ccache-

      - name: ccache before build
        run: ccache --show-stats | grep -E "cache (hits|misses|read)" || ccache --show-stats

      - name: Configure
        run: |
          cmake -S . -B build -G Ninja \
            -DCMAKE_C_COMPILER_LAUNCHER=ccache \
            -DCMAKE_BUILD_TYPE=Release

      - name: Build
        run: cmake --build build --parallel

      - name: Test
        run: ctest --test-dir build --output-on-failure

      - name: ccache after build
        if: always()
        run: |
          ccache --show-stats
          set -o pipefail
          ctest --test-dir build 2>&1 | grep -E "tests passed"