name: Fuzzing

# spell-checker:ignore fuzzer

on:
  pull_request:
  push:
    branches:
      - main

permissions:
  contents: read

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: ${{ github.ref != 'refs/heads/main' }}

jobs:
  fuzz-build:
    name: Build the fuzzers
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install `cargo-fuzz`
        run: |
          echo "RUSTC_BOOTSTRAP=1" >> "${GITHUB_ENV}"
          echo "CARGO_INCREMENTAL=0" >> "${GITHUB_ENV}"
          cargo install cargo-fuzz --locked
      - uses: Swatinem/rust-cache@v2
        with:
          shared-key: "cargo-fuzz-cache-key"
          cache-directories: "fuzz/target"
      - name: Run `cargo-fuzz build`
        run: cargo fuzz build

  fuzz-run:
    needs: fuzz-build
    name: Run the fuzzers
    runs-on: ubuntu-latest
    timeout-minutes: 5
    env:
      RUN_FOR: 60
    strategy:
      matrix:
        test-target:
          - { name: fuzz_cmp, should_pass: true }
          - { name: fuzz_cmp_args, should_pass: true }
          - { name: fuzz_ed, should_pass: true }
          - { name: fuzz_normal, should_pass: true }
          - { name: fuzz_patch, should_pass: true }
          - { name: fuzz_side, should_pass: true }
    steps:
      - uses: actions/checkout@v4
      - name: Install `cargo-fuzz`
        run: |
          echo "RUSTC_BOOTSTRAP=1" >> "${GITHUB_ENV}"
          echo "CARGO_INCREMENTAL=0" >> "${GITHUB_ENV}"
          cargo install cargo-fuzz --locked
      - uses: Swatinem/rust-cache@v2
        with:
          shared-key: "cargo-fuzz-cache-key"
          cache-directories: "fuzz/target"
      - name: Restore Cached Corpus
        uses: actions/cache/restore@v5
        with:
          key: corpus-cache-${{ matrix.test-target.name }}
          path: |
            fuzz/corpus/${{ matrix.test-target.name }}
      - name: Run ${{ matrix.test-target.name }} for XX seconds
        shell: bash
        continue-on-error: ${{ !matrix.test-target.name.should_pass }}
        run: |
          cargo fuzz run ${{ matrix.test-target.name }} -- -max_total_time=${{ env.RUN_FOR }} -detect_leaks=0
      - name: Save Corpus Cache
        uses: actions/cache/save@v5
        with:
          key: corpus-cache-${{ matrix.test-target.name }}
          path: |
            fuzz/corpus/${{ matrix.test-target.name }}