name: Weekly Mutation Testing

on:
  # Run every Monday at 9 AM UTC
  schedule:
    - cron: '0 9 * * 1'
  # Allow manual trigger
  workflow_dispatch:

env:
  CARGO_TERM_COLOR: always

jobs:
  cargo-mutants:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      issues: write

    steps:
      - uses: actions/checkout@v4

      - name: Install Rust
        uses: dtolnay/rust-toolchain@stable

      - uses: taiki-e/install-action@v2
        with:
          tool: cargo-mutants

      - name: Run mutation tests on cashu crate
        run: cargo mutants --package cashu --in-place --no-shuffle
        continue-on-error: true

      - name: Upload mutation results
        uses: actions/upload-artifact@v4
        if: always()
        with:
          name: mutants.out
          path: mutants.out
          retention-days: 90

      - name: Check for missed mutants and create issue
        if: always()
        run: |
          if [ -s mutants.out/missed.txt ]; then
            echo "Missed mutants found"
            MUTANTS_VERSION=$(cargo mutants --version)
            MISSED_COUNT=$(wc -l < mutants.out/missed.txt)
            CAUGHT_COUNT=$(wc -l < mutants.out/caught.txt 2>/dev/null || echo "0")

            gh issue create \
              --title "🧬 Weekly Mutation Testing Report - $(date +%Y-%m-%d)" \
              --label "mutation-testing,weekly-report" \
              --body "$(cat <<EOF
          ## Mutation Testing Results

          - ✅ Caught: ${CAUGHT_COUNT}
          - ❌ Missed: ${MISSED_COUNT}

          ### Top 10 Missed Mutations

          \`\`\`
          $(head -n 10 mutants.out/missed.txt)
          \`\`\`

          ### Action Items

          1. Review the missed mutations above
          2. Add tests to catch these mutations
          3. For the complete list, check the [mutants.out artifact](https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }})

          **cargo-mutants version:** ${MUTANTS_VERSION}

          ---

          💡 **Tip:** Use \`just mutants-quick\` to test only your changes before pushing!
          EOF
          )"
          else
            echo "No missed mutants found! 🎉"
          fi
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}