name: CI

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

jobs:
  test:
    name: Build, lint & test
    runs-on: ubuntu-latest

    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Install Rust stable
        uses: actions-rust-lang/setup-rust-toolchain@v1
        with:
          toolchain: stable
          components: clippy, rustfmt

      - name: Cache Cargo registry & build
        uses: actions/cache@v4
        with:
          path: |
            ~/.cargo/registry
            ~/.cargo/git
            target
          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
          restore-keys: |
            ${{ runner.os }}-cargo-

      - name: Check formatting
        run: cargo fmt --check

      - name: Clippy (deny warnings)
        run: cargo clippy -- -D warnings

      - name: Build
        run: cargo build --locked

      - name: Test
        run: cargo test --locked
        env:
          RUST_BACKTRACE: 1