{ config, lib, ... }:
let
  inherit (config) pages;
  cfg = config;
in
{
  imports = lib.nixFiles ./.;

  collections.news.type = cfg.content-types.article;
  collections.events.type = cfg.content-types.event;

  pages.index = { config, link, ... }: {
    title = "Welcome to the Fediversity project";
    description = "Fediversity web site";
    summary = ''
      This web site hosts up-to-date information about the the NGI Zero Fediversity project.
    '';
    body = ''
      ${pages.fediversity.summary}

      [Learn more about Fediversity](${link pages.fediversity})
    '';
    outputs.html = (cfg.templates.html.page config).override (final: prev: {
      html = {
        head.title.text = "Fediversity";
        head.link.stylesheets = prev.html.head.link.stylesheets ++ [
          { href = "${link cfg.assets."index.css"}"; }
        ];
        body.content =
          let
            prev-content = prev.html.body.content;
            to-section = { heading, body, attrs ? { } }: {
              section = {
                heading.content = heading;
                inherit attrs;
                content = [
                  (cfg.templates.html.markdown {
                    name = "${config.name}-${lib.slug heading}";
                    inherit body;
                  })
                ];
              };
            };
          in
          [
            (lib.head prev-content) # header
            {
              section = {
                attrs = { };
                heading.content = config.title;
                content = [
                  (cfg.templates.html.markdown { inherit (config) name body; })
                ]
                ++
                (map to-section [
                  {
                    heading = "Fediversity grants";
                    body = ''
                      ${pages.grants.summary}

                      [Learn more about Fediversity grants](${link pages.grants})
                    '';
                  }
                  {
                    heading = "Consortium";
                    body = ''
                      The Consortium behind the Fediversity project is a cooperation between NLnet, Open Internet Discourse Foundation, NORDUnet and Tweag.

                      ${toString (map (partner: ''
                      ### ${partner.title}

                      ${partner.summary}

                      [Read more about ${partner.title}](${link partner})
                      '') (with pages; [ nlnet oid tweag nordunet ]))}
                    '';
                  }
                  {
                    heading = "Fediverse explained";
                    body = ''
                      ${toString (map (role: ''
                      ### ${role.title}

                      ${role.summary}

                      [Read more about ${role.title}](${link role})
                      '') (with pages; [ individuals developers european-commission ]))}
                    '';
                  }
                ]);
              };
            }
          ]
          ++
          (map to-section [
            {
              heading = "News";
              attrs = { class = [ "collection" ]; };
              body =
                let
                  sorted = with lib; reverseList (sortOn (entry: entry.date) cfg.collections.news.entry);
                in
                lib.join "\n" (map
                  (article: ''
                    - ${article.date} [${article.title}](${link article})
                  '')
                  sorted);
            }
            {
              heading = "Events";
              attrs = { class = [ "collection" ]; };
              body =
                let
                  sorted = with lib; reverseList (sortOn (entry: entry.start-date) cfg.collections.events.entry);
                in
                lib.join "\n" (map
                  (article: ''
                    - ${article.start-date} [${article.title}](${link article})
                  '')
                  sorted);
            }
          ]);
      };

    });
  };

  assets."index.css".path = with lib; builtins.toFile
    "index.css"
    ''
      section h1, section h2, section h3
      {
        text-align: center;
      }
      section h1 {
        font-size: 3em;
      }
      section h2 {
        font-size: 2.5em;
      }
      section h3 {
        font-size: 1.5em;
      }
      section.collection h1 {
        font-size: 2em;
        text-align: left;
      }
    '';
}