name: CI

on:
  push:
    branches: [master]
  pull_request:
    branches: [master]

env:
  CMAKE_BUILD_PARALLEL_LEVEL: 0
  CCACHE_DIR: ${{ github.workspace }}/.ccache
  CCACHE_MAXSIZE: 256M

jobs:
  # ── 动态矩阵 ──────────────────────────────────────────────
  # PR 仅跑 Ubuntu 节省 minutes；push master 跑全矩阵 Ubuntu + Windows
  matrix:
    name: Determine matrix
    runs-on: ubuntu-24.04
    outputs:
      os: ${{ steps.set-matrix.outputs.os }}
    steps:
      - id: set-matrix
        shell: bash
        run: |
          if [ "${{ github.event_name }}" = "push" ] && [ "${{ github.ref }}" = "refs/heads/master" ]; then
            echo "os=[\"ubuntu-24.04\",\"windows-2025\"]" >> "$GITHUB_OUTPUT"
          else
            echo "os=[\"ubuntu-24.04\"]" >> "$GITHUB_OUTPUT"
          fi

  # ── 构建 & 测试 ───────────────────────────────────────────
  build:
    name: ${{ matrix.os }} / ${{ matrix.build_type }}
    needs: matrix
    strategy:
      fail-fast: false
      matrix:
        os: ${{ fromJSON(needs.matrix.outputs.os) }}
        build_type: [Release]
    runs-on: ${{ matrix.os }}

    steps:
      # ── 1. 源码检出 ──────────────────────────────────────
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 1

      # ── 2. 平台编译工具链 ─────────────────────────────────
      # Ubuntu: clang-18 + Ninja + ccache
      - name: Install toolchain (Ubuntu)
        if: runner.os == 'Linux'
        run: |
          sudo apt-get update -qq
          sudo apt-get install -y -qq clang-18 ninja-build ccache
          echo "CC=clang-18" >> $GITHUB_ENV
          echo "CXX=clang++-18" >> $GITHUB_ENV

      # Windows: LLVM (clang-cl) + Ninja + ccache
      - name: Install toolchain (Windows)
        if: runner.os == 'Windows'
        shell: bash
        run: |
          choco install -y llvm ninja ccache --no-progress 2>/dev/null || true
          # Add clang-cl to PATH (both possible locations)
          # Prefer choco-installed LLVM; fall back to VS-bundled clang-cl
          if [ -d "/c/Program Files/LLVM/bin" ]; then
            echo "/c/Program Files/LLVM/bin" >> $GITHUB_PATH
          elif [ -d "/c/Program Files/Microsoft Visual Studio/2026/Enterprise/VC/Tools/Llvm/x64/bin" ]; then
            echo "/c/Program Files/Microsoft Visual Studio/2026/Enterprise/VC/Tools/Llvm/x64/bin" >> $GITHUB_PATH
          elif [ -d "/c/Program Files/Microsoft Visual Studio/2022/Enterprise/VC/Tools/Llvm/x64/bin" ]; then
            echo "/c/Program Files/Microsoft Visual Studio/2022/Enterprise/VC/Tools/Llvm/x64/bin" >> $GITHUB_PATH
          fi
          echo "CC=clang-cl" >> $GITHUB_ENV
          echo "CXX=clang-cl" >> $GITHUB_ENV

      # ── 3. ccache 缓存恢复 ────────────────────────────────
      - name: Cache ccache
        uses: actions/cache@v4
        with:
          path: ${{ env.CCACHE_DIR }}
          key: ${{ runner.os }}-ccache-${{ matrix.build_type }}-${{ github.run_id }}
          restore-keys: |
            ${{ runner.os }}-ccache-${{ matrix.build_type }}-
            ${{ runner.os }}-ccache-

      # ── 4. Python + Conan ─────────────────────────────────
      - name: Setup Python
        uses: actions/setup-python@v5
        with:
          python-version: '3.12'

      - name: Install Conan
        run: pip install conan

      # ── 5. Conan 依赖缓存 ─────────────────────────────────
      - name: Cache Conan
        uses: actions/cache@v4
        with:
          path: |
            ~/.conan2
            ~/.conan2/p
          key: ${{ runner.os }}-conan-${{ matrix.build_type }}-${{ hashFiles('deps/conanfile.txt') }}
          restore-keys: |
            ${{ runner.os }}-conan-${{ matrix.build_type }}-
            ${{ runner.os }}-conan-

      # ── 6. Conan 依赖安装 ─────────────────────────────────
      - name: Install Conan dependencies
        shell: bash
        run: |
          conan profile detect --force
          conan install deps --build=missing -s build_type=${{ matrix.build_type }}

      # ── 7. CMake 配置 ─────────────────────────────────────
      - name: Configure CMake
        shell: bash
        run: |
          cmake --preset ci-release \
            -DCMAKE_C_COMPILER_LAUNCHER=ccache \
            -DCMAKE_CXX_COMPILER_LAUNCHER=ccache

      # ── 8. 构建（含计时） ─────────────────────────────────
      - name: Build
        id: build
        shell: bash
        run: |
          echo "::group::Build (${{ matrix.os }})"
          START_NS=$(date +%s%N 2>/dev/null || echo 0)
          START_S=$(date +%s)
          cmake --build --preset ci-release --config ${{ matrix.build_type }}
          END_S=$(date +%s)
          END_NS=$(date +%s%N 2>/dev/null || echo 0)
          DURATION=$((END_S - START_S))
          echo "::endgroup::"
          echo "duration=${DURATION}" >> $GITHUB_OUTPUT
          echo "Build wall time: ${DURATION}s"

      # ── 9. ccache 统计 ────────────────────────────────────
      - name: ccache stats
        if: always()
        shell: bash
        run: |
          ccache -s || echo "ccache stats unavailable"
          ccache -z || true

      # ── 10. 测试 ──────────────────────────────────────────
      - name: Test
        shell: bash
        run: ctest --preset ci-release -C ${{ matrix.build_type }} --output-on-failure

      # ── 11. 构建时间摘要 ──────────────────────────────────
      - name: Build time summary
        if: always()
        shell: bash
        run: |
          DURATION="${{ steps.build.outputs.duration }}"
          echo "| Platform | Compiler | Build Time |" >> $GITHUB_STEP_SUMMARY
          echo "|----------|----------|-----------|" >> $GITHUB_STEP_SUMMARY
          echo "| ${{ matrix.os }} | ${{ (runner.os == 'Linux' && 'clang-18') || 'clang-cl' }} | ${DURATION}s |" >> $GITHUB_STEP_SUMMARY
          echo "CI build: ${{ matrix.os }} / ${{ (runner.os == 'Linux' && 'clang-18') || 'clang-cl' }} wall time ${DURATION}s"

  # ── Sanitizer (PR-only, Linux clang-18, no ccache) ───────
  sanitize:
    name: Sanitizer (ASan+UBSan) / ubuntu-24.04
    if: github.event_name == 'pull_request'
    runs-on: ubuntu-24.04

    steps:
      # ── 1. 源码检出 ──────────────────────────────────────
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 1

      # ── 2. 工具链 (clang-18) ─────────────────────────────
      - name: Install toolchain (Ubuntu)
        run: |
          sudo apt-get update -qq
          sudo apt-get install -y -qq clang-18 ninja-build
          echo "CC=clang-18" >> $GITHUB_ENV
          echo "CXX=clang++-18" >> $GITHUB_ENV

      # ── 3. Python + Conan ─────────────────────────────────
      - name: Setup Python
        uses: actions/setup-python@v5
        with:
          python-version: '3.12'

      - name: Install Conan
        run: pip install conan

      # ── 4. Conan 依赖缓存 ─────────────────────────────────
      - name: Cache Conan
        uses: actions/cache@v4
        with:
          path: |
            ~/.conan2
            ~/.conan2/p
          key: ${{ runner.os }}-conan-Release-${{ hashFiles('deps/conanfile.txt') }}
          restore-keys: |
            ${{ runner.os }}-conan-Release-
            ${{ runner.os }}-conan-

      # ── 5. Conan 依赖安装 ─────────────────────────────────
      - name: Install Conan dependencies
        shell: bash
        run: |
          conan profile detect --force
          conan install deps --build=missing -s build_type=Release

      # ── 6. CMake 配置 ─────────────────────────────────────
      - name: Configure CMake (Sanitizer)
        shell: bash
        run: cmake --preset ci-sanitize

      # ── 7. 构建 ───────────────────────────────────────────
      - name: Build (Sanitizer)
        shell: bash
        run: cmake --build --preset ci-sanitize

      # ── 8. 测试 ──────────────────────────────────────────
      - name: Test (Sanitizer)
        shell: bash
        run: ctest --preset ci-sanitize --output-on-failure