name: Documentation and GitHub Pages

on:
  pull_request:
  push:
    branches:
      - main

  # Allows you to run this workflow manually from the Actions tab
  workflow_dispatch:

env:
  # Required to make some things output color
  TERM: ansi
  # Publishing to my nix binary cache
  ATTIC_TOKEN: ${{ secrets.ATTIC_TOKEN }}
  # Custom nix binary cache if fork is being used
  ATTIC_ENDPOINT: ${{ vars.ATTIC_ENDPOINT }}
  ATTIC_PUBLIC_KEY: ${{ vars.ATTIC_PUBLIC_KEY }}

# Allow only one concurrent deployment, skipping runs queued between the run in-progress and latest queued.
# However, do NOT cancel in-progress runs as we want to allow these production deployments to complete.
concurrency:
  group: "pages"
  cancel-in-progress: false

jobs:
  docs:
    name: Documentation and GitHub Pages

    runs-on: ubuntu-latest

    permissions:
      pages: write
      id-token: write

    environment:
      name: github-pages
      url: ${{ steps.deployment.outputs.page_url }}

    steps:
      - name: Sync repository
        uses: actions/checkout@v4

      - name: Setup GitHub Pages
        if: github.event_name != 'pull_request'
        uses: actions/configure-pages@v5

      - name: Install Nix (with flakes and nix-command enabled)
        uses: cachix/install-nix-action@v26
        with:
          nix_path: nixpkgs=channel:nixos-unstable

          # Add `nix-community`, Crane, upstream Conduit, and conduwuit binary caches
          extra_nix_config: |
            experimental-features = nix-command flakes
            extra-substituters = https://nix-community.cachix.org
            extra-trusted-public-keys = nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs=
            extra-substituters = https://crane.cachix.org
            extra-trusted-public-keys = crane.cachix.org-1:8Scfpmn9w+hGdXH/Q9tTLiYAE/2dnJYRJP7kl80GuRk=
            extra-substituters = https://nix.computer.surgery/conduit
            extra-trusted-public-keys = conduit:ZGAf6P6LhNvnoJJ3Me3PRg7tlLSrPxcQ2RiE5LIppjo=
            extra-substituters = https://attic.kennel.juneis.dog/conduit
            extra-trusted-public-keys = conduit:Isq8FGyEC6FOXH6nD+BOeAA+bKp6X6UIbupSlGEPuOg=
            extra-substituters = https://attic.kennel.juneis.dog/conduwuit
            extra-trusted-public-keys = conduwuit:lYPVh7o1hLu1idH4Xt2QHaRa49WRGSAqzcfFd94aOTw=

      - name: Add alternative Nix binary caches if specified
        if: ${{ (env.ATTIC_ENDPOINT != '') && (env.ATTIC_PUBLIC_KEY != '') }}
        run: |
          echo "extra-substituters = ${{ env.ATTIC_ENDPOINT }}" >> /etc/nix/nix.conf
          echo "extra-trusted-public-keys = ${{ env.ATTIC_PUBLIC_KEY }}" >> /etc/nix/nix.conf

      - name: Pop/push Magic Nix Cache
        uses: DeterminateSystems/magic-nix-cache-action@main

      - name: Configure `nix-direnv`
        run: |
          echo 'source $HOME/.nix-profile/share/nix-direnv/direnvrc' > "$HOME/.direnvrc"

      - name: Install `direnv` and `nix-direnv`
        run: nix-env -f "<nixpkgs>" -iA direnv -iA nix-direnv

      # Do this to shorten the logs for the real CI step
      - name: Populate `/nix/store`
        run: nix develop --command true

      - name: Allow direnv
        run: direnv allow

      - name: Cache x86_64 inputs for devShell
        run: |
          ./bin/nix-build-and-cache .#devShells.x86_64-linux.default.inputDerivation

      - name: Build documentation (book)
        run: |
          ./bin/nix-build-and-cache .#book
          cp -r --dereference result public
      - name: Upload generated documentation (book) as normal artifact
        uses: actions/upload-artifact@v4
        with:
          name: public
          path: public
          if-no-files-found: error
          # don't compress again
          compression-level: 0

      - name: Upload generated documentation (book) as GitHub Pages artifact
        if: github.event_name != 'pull_request'
        uses: actions/upload-pages-artifact@v3
        with:
          path: public

      - name: Deploy to GitHub Pages
        if: github.event_name != 'pull_request'
        id: deployment
        uses: actions/deploy-pages@v4
