name: Code Coverage

on: ["push", "pull_request"]

env:
  CARGO_TERM_COLOR: always
  RUST_TOOLCHAIN: 1.86.0

jobs:
  coverage:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v5

      - name: Install Rust toolchain
        uses: dtolnay/rust-toolchain@master
        with:
          toolchain: ${{ env.RUST_TOOLCHAIN }}
          components: llvm-tools-preview

      - name: Rust Cache
        uses: Swatinem/rust-cache@v2

      - name: Cache vcpkg
        uses: actions/cache@v4
        with:
          path: target/vcpkg
          key: A-vcpkg-${{ runner.os }}-${{ hashFiles('Cargo.toml', 'Cargo.lock') }}
          restore-keys: |
            A-vcpkg-${{ runner.os }}-

      - name: Vcpkg Linux Dependencies
        run: |
          sudo apt-get update
          sudo apt-get install -y libltdl-dev

      - name: Vcpkg
        run: |
          cargo install cargo-vcpkg
          cargo vcpkg -v build

      - uses: taiki-e/install-action@cargo-llvm-cov
      - uses: taiki-e/install-action@nextest
      - uses: taiki-e/install-action@just

      - name: Generate coverage report
        run: |
          just coverage

      - name: Download Coveralls CLI
        run: |
          # use GitHub Releases URL instead of coveralls.io because they can't maintain their own files; it 404s
          curl -L https://github.com/coverallsapp/coverage-reporter/releases/download/v0.6.15/coveralls-linux-x86_64.tar.gz | tar -xz -C /usr/local/bin

      - name: Upload coverage to Coveralls
        env:
          COVERALLS_REPO_TOKEN: ${{ secrets.COVERALLS_REPO_TOKEN }}
        run: |
          if [ ! -f "lcov.info" ]; then
            echo "Error: lcov.info file not found. Coverage generation may have failed."
            exit 1
          fi

          for i in {1..10}; do
            echo "Attempt $i: Uploading coverage to Coveralls..."
            if coveralls -n report lcov.info; then
              echo "Successfully uploaded coverage report."
              exit 0
            fi

            if [ $i -lt 10 ]; then
              delay=$((2**i))
              echo "Attempt $i failed. Retrying in $delay seconds..."
              sleep $delay
            fi
          done

          echo "Failed to upload coverage report after 10 attempts."
          exit 1