name: Test Fuzz

on:
    schedule:
        - cron: "0 2 * * 0" # Weekly Sunday 2am UTC
    workflow_dispatch:
        inputs:
            fuzz_seconds:
                description: "Seconds to run each fuzz target"
                required: false
                default: "300"

concurrency:
    group: fuzz-${{ github.ref }}
    cancel-in-progress: true

permissions:
    contents: read
    issues: write

env:
    CARGO_TERM_COLOR: always

jobs:
    fuzz:
        name: Fuzz (${{ matrix.target }})
        runs-on: blacksmith-2vcpu-ubuntu-2404
        timeout-minutes: 60
        strategy:
            fail-fast: false
            matrix:
                target:
                    - fuzz_config_parse
                    - fuzz_tool_params
        steps:
            - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4

            - uses: dtolnay/rust-toolchain@631a55b12751854ce901bb631d5902ceb48146f7 # stable
              with:
                  toolchain: nightly
                  components: llvm-tools-preview

            - name: Install cargo-fuzz
              run: cargo install cargo-fuzz --locked

            - name: Run fuzz target
              run: |
                  SECONDS="${{ github.event.inputs.fuzz_seconds || '300' }}"
                  echo "Fuzzing ${{ matrix.target }} for ${SECONDS}s"
                  cargo +nightly fuzz run ${{ matrix.target }} -- \
                    -max_total_time="${SECONDS}" \
                    -max_len=4096
              continue-on-error: true
              id: fuzz

            - name: Upload crash artifacts
              if: failure() || steps.fuzz.outcome == 'failure'
              uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6
              with:
                  name: fuzz-crashes-${{ matrix.target }}
                  path: fuzz/artifacts/${{ matrix.target }}/
                  retention-days: 30
                  if-no-files-found: ignore

            - name: Report fuzz results
              run: |
                  echo "### Fuzz: ${{ matrix.target }}" >> "$GITHUB_STEP_SUMMARY"
                  if [ "${{ steps.fuzz.outcome }}" = "failure" ]; then
                    echo "- :x: Crashes found — see artifacts" >> "$GITHUB_STEP_SUMMARY"
                  else
                    echo "- :white_check_mark: No crashes found" >> "$GITHUB_STEP_SUMMARY"
                  fi