{ pkgs
, options
, config
, version
, revision
, extraSources ? []
, baseOptionsJSON ? null
, warningsAreErrors ? true
, prefix ? ../../..
}:

let
  inherit (pkgs) buildPackages runCommand docbook_xsl_ns;

  inherit (pkgs.lib)
    hasPrefix
    removePrefix
    flip
    foldr
    types
    mkOption
    escapeShellArg
    concatMapStringsSep
    sourceFilesBySuffices
    ;

  common = import ./common.nix;

  manpageUrls = pkgs.path + "/doc/manpage-urls.json";

  # We need to strip references to /nix/store/* from options,
  # including any `extraSources` if some modules came from elsewhere,
  # or else the build will fail.
  #
  # E.g. if some `options` came from modules in ${pkgs.customModules}/nix,
  # you'd need to include `extraSources = [ pkgs.customModules ]`
  prefixesToStrip = map (p: "${toString p}/") ([ prefix ] ++ extraSources);
  stripAnyPrefixes = flip (foldr removePrefix) prefixesToStrip;

  optionsDoc = buildPackages.nixosOptionsDoc {
    inherit options revision baseOptionsJSON warningsAreErrors;
    transformOptions = opt: opt // {
      # Clean up declaration sites to not refer to the NixOS source tree.
      declarations = map stripAnyPrefixes opt.declarations;
    };
  };

  nixos-lib = import ../../lib { };

  testOptionsDoc = let
      eval = nixos-lib.evalTest {
        # Avoid evaluating a NixOS config prototype.
        config.node.type = types.deferredModule;
        options._module.args = mkOption { internal = true; };
      };
    in buildPackages.nixosOptionsDoc {
      inherit (eval) options;
      inherit revision;
      transformOptions = opt: opt // {
        # Clean up declaration sites to not refer to the NixOS source tree.
        declarations =
          map
            (decl:
              if hasPrefix (toString ../../..) (toString decl)
              then
                let subpath = removePrefix "/" (removePrefix (toString ../../..) (toString decl));
                in { url = "https://github.com/NixOS/nixpkgs/blob/master/${subpath}"; name = subpath; }
              else decl)
            opt.declarations;
      };
      documentType = "none";
      variablelistId = "test-options-list";
      optionIdPrefix = "test-opt-";
    };

  testDriverMachineDocstrings = pkgs.callPackage
    ../../../nixos/lib/test-driver/nixos-test-driver-docstrings.nix {};

  prepareManualFromMD = ''
    cp -r --no-preserve=all $inputs/* .

    substituteInPlace ./manual.md \
      --replace-fail '@NIXOS_VERSION@' "${version}"
    substituteInPlace ./configuration/configuration.md \
      --replace-fail \
          '@MODULE_CHAPTERS@' \
          ${escapeShellArg (concatMapStringsSep "\n" (p: "${p.value}") config.meta.doc)}
    substituteInPlace ./nixos-options.md \
      --replace-fail \
        '@NIXOS_OPTIONS_JSON@' \
        ${optionsDoc.optionsJSON}/${common.outputPath}/options.json
    substituteInPlace ./development/writing-nixos-tests.section.md \
      --replace-fail \
        '@NIXOS_TEST_OPTIONS_JSON@' \
        ${testOptionsDoc.optionsJSON}/${common.outputPath}/options.json
    sed -e '/@PYTHON_MACHINE_METHODS@/ {' -e 'r ${testDriverMachineDocstrings}/machine-methods.md' -e 'd' -e '}' \
      -i ./development/writing-nixos-tests.section.md
  '';

in rec {
  inherit (optionsDoc) optionsJSON optionsNix optionsDocBook;

  # Generate the NixOS manual.
  manualHTML = runCommand "nixos-manual-html"
    { nativeBuildInputs = [ buildPackages.nixos-render-docs ];
      inputs = sourceFilesBySuffices ./. [ ".md" ];
      meta.description = "The NixOS manual in HTML format";
      allowedReferences = ["out"];
    }
    ''
      # Generate the HTML manual.
      dst=$out/${common.outputPath}
      mkdir -p $dst

      cp ${../../../doc/style.css} $dst/style.css
      cp ${../../../doc/anchor.min.js} $dst/anchor.min.js
      cp ${../../../doc/anchor-use.js} $dst/anchor-use.js

      cp -r ${pkgs.documentation-highlighter} $dst/highlightjs

      ${prepareManualFromMD}

      nixos-render-docs -j $NIX_BUILD_CORES manual html \
        --manpage-urls ${manpageUrls} \
        --redirects ${./redirects.json} \
        --revision ${escapeShellArg revision} \
        --generator "nixos-render-docs ${pkgs.lib.version}" \
        --stylesheet style.css \
        --stylesheet highlightjs/mono-blue.css \
        --script ./highlightjs/highlight.pack.js \
        --script ./highlightjs/loader.js \
        --script ./anchor.min.js \
        --script ./anchor-use.js \
        --toc-depth 1 \
        --chunk-toc-depth 1 \
        ./manual.md \
        $dst/${common.indexPath}

      mkdir -p $out/nix-support
      echo "nix-build out $out" >> $out/nix-support/hydra-build-products
      echo "doc manual $dst" >> $out/nix-support/hydra-build-products
    ''; # */

  # Alias for backward compatibility. TODO(@oxij): remove eventually.
  manual = manualHTML;

  # Index page of the NixOS manual.
  manualHTMLIndex = "${manualHTML}/${common.outputPath}/${common.indexPath}";

  manualEpub = runCommand "nixos-manual-epub"
    { nativeBuildInputs = [ buildPackages.libxml2.bin buildPackages.libxslt.bin buildPackages.zip ];
      doc = ''
        <book xmlns="http://docbook.org/ns/docbook"
              xmlns:xlink="http://www.w3.org/1999/xlink"
              version="5.0"
              xml:id="book-nixos-manual">
          <info>
            <title>NixOS Manual</title>
            <subtitle>Version ${pkgs.lib.version}</subtitle>
          </info>
          <chapter>
            <title>Temporarily unavailable</title>
            <para>
              The NixOS manual is currently not available in EPUB format,
              please use the <link xlink:href="https://nixos.org/nixos/manual">HTML manual</link>
              instead.
            </para>
            <para>
              If you've used the EPUB manual in the past and it has been useful to you, please
              <link xlink:href="https://github.com/NixOS/nixpkgs/issues/237234">let us know</link>.
            </para>
          </chapter>
        </book>
      '';
      passAsFile = [ "doc" ];
    }
    ''
      # Generate the epub manual.
      dst=$out/${common.outputPath}

      xsltproc \
        --param chapter.autolabel 0 \
        --nonet --xinclude --output $dst/epub/ \
        ${docbook_xsl_ns}/xml/xsl/docbook/epub/docbook.xsl \
        $docPath

      echo "application/epub+zip" > mimetype
      manual="$dst/nixos-manual.epub"
      zip -0Xq "$manual" mimetype
      cd $dst/epub && zip -Xr9D "$manual" *

      rm -rf $dst/epub

      mkdir -p $out/nix-support
      echo "doc-epub manual $manual" >> $out/nix-support/hydra-build-products
    '';


  # Generate the `man configuration.nix` package
  nixos-configuration-reference-manpage = runCommand "nixos-configuration-reference-manpage"
    { nativeBuildInputs = [
        buildPackages.installShellFiles
        buildPackages.nixos-render-docs
      ];
      allowedReferences = ["out"];
    }
    ''
      # Generate manpages.
      mkdir -p $out/share/man/man5
      nixos-render-docs -j $NIX_BUILD_CORES options manpage \
        --revision ${escapeShellArg revision} \
        ${optionsJSON}/${common.outputPath}/options.json \
        $out/share/man/man5/configuration.nix.5
    '';

}
