name: Nix Flake

on:
  push:
    paths:
      - "**.nix"
      - "flake.lock"
      - "Cargo.toml"
      - "Cargo.lock"
      - "crates/**"
      - ".github/workflows/nix.yml"
  pull_request:
    paths:
      - "**.nix"
      - "flake.lock"
      - "Cargo.toml"
      - "Cargo.lock"
      - "crates/**"
      - ".github/workflows/nix.yml"
  workflow_dispatch:

jobs:
  check-flake:
    name: Validate Flake & Build
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v7
        with:
          submodules: recursive

      - name: Install Nix
        uses: DeterminateSystems/nix-installer-action@v22

      - name: Magic Nix Cache
        uses: DeterminateSystems/magic-nix-cache-action@v14

      - name: Check flake formatting and evaluation
        run: nix flake check

      - name: Build default package
        run: nix build .#default