name: CI

on:
  push:
    branches: [main]
    paths:
      - "**.nix"
      - "flake.lock"
      - ".github/workflows/ci.yaml"
  pull_request:
    paths:
      - "**.nix"
      - "flake.lock"
      - ".github/workflows/ci.yaml"
  workflow_call:
    inputs:
      ref:
        type: string
        description: "The branch, tag or SHA to checkout."
        required: false
  workflow_dispatch:

jobs:
  eval:
    name: Eval

    runs-on: ubuntu-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          ref: ${{ inputs.ref }}

      - name: Install Nix
        uses: cachix/install-nix-action@v30

      - name: Evaluate Flake 
        run: |
          nix flake check \
            --all-systems \
            --no-build \
            --show-trace

  # build:
  #   name: Build (${{ matrix.system }})

  #   strategy:
  #     matrix:
  #       include:
  #         - os: ubuntu-latest
  #           system: x86_64-linux

  #   runs-on: ${{ matrix.os }}

  #   steps:
  #     - name: Checkout repository
  #       uses: actions/checkout@v4
  #       with:
  #         ref: ${{ inputs.ref }}

  #     - name: Install Nix
  #       uses: cachix/install-nix-action@v30

  #     - name: Run build
  #       run: |
  #         nix flake check \
  #           --fallback \
  #           --print-build-logs \
  #           --show-trace