name: CI

on:
  pull_request:
  push:

jobs:
  build-nix:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Install Nix
        uses: cachix/install-nix-action@v29
        with:
          github_access_token: ${{ secrets.GITHUB_TOKEN }}
          extra_nix_config: |
            access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
            allow-import-from-derivation = true
            auto-optimise-store = true
            experimental-features = nix-command flakes
            substituters = https://cache.nixos.org https://cache.iog.io
            trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ=

      - name: Build with cachix
        uses: cachix/cachix-action@v15
        with:
          name: hakyll-nix-template
          authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}

      - run: nix build --accept-flake-config

      - name: Artifact pages
        uses: actions/upload-artifact@v4
        with:
          name: pages
          path: result/dist

  deploy:
    if: github.ref == 'refs/heads/main'
    runs-on: ubuntu-latest
    needs: [build-nix]

    steps:
      - name: Download artifact
        uses: actions/download-artifact@v4
        with:
          name: pages
          path: result

      - name: Deploy to GitHub Pages
        if: success()
        uses: crazy-max/ghaction-github-pages@v4.0.0
        with:
          build_dir: result
          target_branch: gh-pages
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}