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name: Rust pre-merge checks

on:
  # Always run this workflow when commits are pushed to main.
  push:
    branches:
    - main

  # Run this workflow on pull requests targeting main but only if files in runtime/rust change.
  pull_request:
    branches:
    - main
    paths:
    - .github/workflows/pre-merge-rust.yml
    - 'lib/runtime/**'
    - 'lib/llm/**'
    - 'lib/bindings/**'
    - 'launch/**'
    - 'components/**'
    - '**.rs'
    - 'Cargo.toml'
    - 'Cargo.lock'

jobs:
  pre-merge-rust:
    runs-on: ubuntu-latest
    strategy:
      matrix: { dir: ['.', 'lib/bindings/python', 'lib/runtime/examples'] }
    permissions:
      contents: read
    steps:
    - uses: actions/checkout@v4
    - name: Set up system dependencies
      run: |
        sudo apt-get update -y
        sudo apt-get install -y protobuf-compiler
    - name: Cache Cargo Registry
      uses: actions/cache@v3
      with:
        path: ~/.cargo/registry
        key: ${{ runner.os }}-cargo-registry-${{ github.head_ref || github.ref_name }}-${{ hashFiles('**/Cargo.lock') }}
    - name: Cache Cargo Tools
      uses: actions/cache@v3
      with:
        path: ~/.cargo/bin
        key: ${{ runner.os }}-cargo-tools-${{ github.head_ref || github.ref_name }}-${{ hashFiles('**/Cargo.lock') }}
    - name: Install Rust in dev environment
      # Install Rust only to run GitHub Local Actions in (dev environment) using the `ACT` environment variable.
      # See act usage: https://nektosact.com/introduction.html
      # https://nektosact.com/usage/index.html?highlight=env.Act#skipping-steps
      if: ${{ env.ACT }}
      run: |
        curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
        rustup toolchain install 1.85.0-x86_64-unknown-linux-gnu
        echo "$HOME/.cargo/bin" >> $GITHUB_PATH
    - name: Set up Rust Toolchain Components
      run: rustup component add rustfmt clippy
    - name: Run Cargo Check
      working-directory: ${{ matrix.dir }}
      run: cargo check --locked
      timeout-minutes: 5
    - name: Verify Code Formatting
      working-directory: ${{ matrix.dir }}
      run: cargo fmt -- --check
    - name: Run Clippy Checks
      working-directory: ${{ matrix.dir }}
      run: cargo clippy --no-deps --all-targets -- -D warnings
    - name: Install and Run cargo-deny
      working-directory: ${{ matrix.dir }}
      run: |
        cargo-deny --version || cargo install cargo-deny@0.16.4
        cargo-deny --no-default-features check --hide-inclusion-graph licenses --config ${{ github.workspace }}/deny.toml
    - name: Run Unit Tests
      working-directory: ${{ matrix.dir }}
      run: cargo test --locked --all-targets