name: CI

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

env:
  CARGO_TERM_COLOR: always
  RUSTFLAGS: "-D warnings"

jobs:
  check:
    name: Check
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: dtolnay/rust-toolchain@stable
      - uses: Swatinem/rust-cache@v2
      - run: cargo check --all-targets

  fmt:
    name: Format
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: dtolnay/rust-toolchain@stable
        with:
          components: rustfmt
      - run: cargo fmt --all -- --check

  clippy:
    name: Clippy
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: dtolnay/rust-toolchain@stable
        with:
          components: clippy
      - uses: Swatinem/rust-cache@v2
      - run: cargo clippy --all-targets -- -D warnings

  test:
    name: Test
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: dtolnay/rust-toolchain@stable
      - uses: Swatinem/rust-cache@v2
      - run: cargo test --all-targets

  examples:
    name: Build Examples
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: dtolnay/rust-toolchain@stable
      - uses: Swatinem/rust-cache@v2
      - run: cargo build --release
      - name: Compile all .ne examples
        run: |
          for f in examples/*.ne; do
            echo "==> Compiling $f"
            cargo run --release -- build "$f"
          done
      - name: Verify ROMs are valid iNES
        run: |
          for f in examples/*.nes; do
            echo "==> Checking $f"
            # iNES magic: first 4 bytes must be "NES\x1a"
            header=$(od -A n -t x1 -N 4 "$f" | tr -d ' ')
            if [ "$header" != "4e45531a" ]; then
              echo "FAIL: $f is not a valid iNES ROM (header: $header)"
              exit 1
            fi
            size=$(stat -c%s "$f")
            echo "    OK: $size bytes"
          done