name: Codecov Rust

on:
  push:
    branches: ["main"]
  pull_request:
    branches: ["main"]

env:
  CARGO_TERM_COLOR: always
  CARGO_TARGET_DIR: /app/target
  CARGO_INCREMENTAL: 0
  RUSTFLAGS: "-C instrument-coverage -C link-dead-code"
  LLVM_PROFILE_FILE: "/app/coverage/cargo-test-%p-%m.profraw"

jobs:
  coverage:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v4

      - name: Build test image
        run: docker compose -f docker-compose.test.yml build agent-test

      - name: Start agent-test container
        run: docker compose -f docker-compose.test.yml up -d agent-test

      - name: Run tests inside container
        run: |
          docker compose -f docker-compose.test.yml exec -T \
            -e CARGO_TARGET_DIR \
            -e CARGO_INCREMENTAL \
            -e RUSTFLAGS \
            -e LLVM_PROFILE_FILE \
            agent-test bash -c "
              mkdir -p /app/coverage &&
              rm -rf /app/target/* /app/coverage/* &&
              cargo test --verbose -- --test-threads=2 &&
              sync
            "

      - name: Verify profraw files exist
        run: |
          docker compose -f docker-compose.test.yml exec -T \
            agent-test bash -c '
              count=$(find /app/coverage -type f -name "*.profraw" | wc -l)
              echo "profraw files: $count"
              test "$count" -gt 0
            '

      - name: Generate coverage report inside container
        run: |
          docker compose -f docker-compose.test.yml exec -T \
            agent-test bash -c "
              rustup component add llvm-tools-preview &&
              grcov /app/coverage \
                --binary-path /app/target/debug \
                -s /app \
                --llvm \
                -t lcov \
                --branch \
                --ignore-not-existing \
                --ignore '/app/target/*' \
                -o /app/lcov.info
            "

      - name: Copy lcov.info from container to host
        run: docker compose -f docker-compose.test.yml cp agent-test:/app/lcov.info ./lcov.info

      - name: Show basic coverage report info
        run: |
          echo "lcov.info size:" $(wc -c ./lcov.info | awk '{print $1}')
          head -n 30 ./lcov.info || true
          test -s ./lcov.info

      - name: Upload coverage to Codecov
        uses: codecov/codecov-action@v5
        with:
          files: ./lcov.info
          flags: unittests
          name: rust-unit-coverage
          verbose: true
          fail_ci_if_error: true
          token: ${{ secrets.CODECOV_TOKEN }}
          use_pypi: true

      - name: Stop and remove container
        if: always()
        run: docker compose -f docker-compose.test.yml down --volumes