name: "Fuzz"
on:
  push:
    branches: [main]
  schedule:
    # Nightly at 2am UTC for longer fuzzing sessions
    - cron: "0 2 * * *"
  workflow_dispatch:
    inputs:
      duration:
        description: "Fuzz duration per target (seconds)"
        default: "60"

permissions:
  contents: read

jobs:
  fuzz-linux:
    runs-on: ubuntu-22.04
    steps:
      - uses: actions/checkout@v4
      - name: Install LLVM 18
        run: |
          wget -qO- https://apt.llvm.org/llvm.sh | sudo bash -s -- 18
          echo "FUZZ_CC=clang-18" >> $GITHUB_ENV
      - run: ./scripts/vendor.sh
      - name: Build fuzz targets
        run: make -C tests/fuzz all FUZZ_CC=$FUZZ_CC FUZZ_LDFLAGS=
      - name: Run fuzz targets
        run: |
          DURATION=${{ github.event.inputs.duration || '60' }}
          EXIT_CODE=0
          for target in tests/fuzz/targets/*; do
            [ -f "$target" ] && [ -x "$target" ] || continue
            name=$(basename "$target")
            echo "::group::Fuzzing $name ($DURATION seconds)"
            corpus="tests/fuzz/corpus/$name"
            mkdir -p "$corpus"
            dict="tests/fuzz/${name//_/-}.dict"
            dict_flag=""
            [ -f "$dict" ] && dict_flag="-dict=$dict"
            if ! ASAN_OPTIONS=detect_leaks=1 "$target" $dict_flag \
              -max_total_time="$DURATION" "$corpus" 2>&1; then
              echo "::error::Fuzz target $name found a crash!"
              EXIT_CODE=1
            fi
            echo "::endgroup::"
          done
          exit $EXIT_CODE
      - name: Upload crash artifacts
        if: failure()
        uses: actions/upload-artifact@v4
        with:
          name: fuzz-crashes-linux
          path: |
            tests/fuzz/crash-*
            tests/fuzz/leak-*
            tests/fuzz/timeout-*

  fuzz-macos:
    runs-on: macos-14
    steps:
      - uses: actions/checkout@v4
      - name: Install LLVM
        run: brew install llvm
      - run: ./scripts/vendor.sh
      - name: Build fuzz targets
        run: make -C tests/fuzz all FUZZ_CC=/opt/homebrew/opt/llvm/bin/clang
      - name: Run fuzz targets
        env:
          DYLD_LIBRARY_PATH: "/opt/homebrew/opt/llvm/lib/c++:${{ env.DYLD_LIBRARY_PATH }}"
        run: |
          DURATION=${{ github.event.inputs.duration || '60' }}
          EXIT_CODE=0
          for target in tests/fuzz/targets/*; do
            [ -f "$target" ] && [ -x "$target" ] || continue
            name=$(basename "$target")
            echo "::group::Fuzzing $name ($DURATION seconds)"
            corpus="tests/fuzz/corpus/$name"
            mkdir -p "$corpus"
            dict="tests/fuzz/${name//_/-}.dict"
            dict_flag=""
            [ -f "$dict" ] && dict_flag="-dict=$dict"
            if ! "$target" $dict_flag \
              -max_total_time="$DURATION" "$corpus" 2>&1; then
              echo "::error::Fuzz target $name found a crash!"
              EXIT_CODE=1
            fi
            echo "::endgroup::"
          done
          exit $EXIT_CODE
      - name: Upload crash artifacts
        if: failure()
        uses: actions/upload-artifact@v4
        with:
          name: fuzz-crashes-macos
          path: |
            tests/fuzz/crash-*
            tests/fuzz/leak-*
            tests/fuzz/timeout-*

  fuzz-windows:
    # Best-effort: libFuzzer works on Windows via LLVM but ASAN/UBSAN
    # support is less reliable. Leak detection is not available.
    runs-on: windows-2022
    continue-on-error: true
    steps:
      - uses: actions/checkout@v4
      - name: Install LLVM 18
        run: choco install llvm --version=18.1.8 -y
      - run: bash ./scripts/vendor.sh
        shell: bash
      - name: Build fuzz targets
        shell: bash
        run: |
          export PATH="/c/Program Files/LLVM/bin:$PATH"
          cd tests/fuzz
          mkdir -p targets
          for src in *.c; do
            name="${src%.c}"
            target_name="${name//-/_}"
            echo "Building $target_name from $src"
            clang -fsanitize=address,fuzzer \
              -I ../../ -I ../../vendor -DSQLITE_CORE -g \
              ../../vendor/sqlite3.c ../../sqlite-vec.c \
              "$src" -o "targets/${target_name}.exe" || {
              echo "Warning: failed to build $target_name (best-effort)"
            }
          done
      - name: Run fuzz targets
        shell: bash
        run: |
          export PATH="/c/Program Files/LLVM/bin:$PATH"
          DURATION=${{ github.event.inputs.duration || '60' }}
          for target in tests/fuzz/targets/*.exe; do
            [ -f "$target" ] || continue
            name=$(basename "$target" .exe)
            echo "=== Fuzzing $name ($DURATION seconds) ==="
            corpus="tests/fuzz/corpus/$name"
            mkdir -p "$corpus"
            "$target" -max_total_time="$DURATION" "$corpus" 2>&1 || {
              echo "Warning: $name found an issue or failed"
            }
          done
      - name: Upload crash artifacts
        if: failure()
        uses: actions/upload-artifact@v4
        with:
          name: fuzz-crashes-windows
          path: |
            tests/fuzz/crash-*
            tests/fuzz/leak-*