{ lib, pkgs, config, myconfig, mylibs, ... }:
let
  mastodon = pkgs.callPackage ./mastodon.nix {
    inherit (mylibs) fetchedGithub;
    env = myconfig.env.tools.mastodon;
  };

  root = "/run/current-system/webapps/tools_mastodon";
  cfg = config.services.myWebsites.tools.mastodon;
in {
  options.services.myWebsites.tools.mastodon = {
    enable = lib.mkEnableOption "enable mastodon's website";
  };

  config = lib.mkIf cfg.enable {
    ids.uids.mastodon = myconfig.env.tools.mastodon.user.uid;
    ids.gids.mastodon = myconfig.env.tools.mastodon.user.gid;

    users.users.mastodon = {
      name = "mastodon";
      uid = config.ids.uids.mastodon;
      group = "mastodon";
      description = "Mastodon user";
      home = mastodon.varDir;
      useDefaultShell = true;
    };

    users.groups.mastodon.gid = config.ids.gids.mastodon;

    systemd.services.mastodon-streaming = {
      description = "Mastodon Streaming";
      wantedBy = [ "multi-user.target" ];
      after = [ "network.target" "mastodon-web.service" ];

      environment.NODE_ENV = "production";
      environment.SOCKET = mastodon.nodeSocket;

      path = [ pkgs.nodejs pkgs.bashInteractive ];

      script = ''
        exec npm run start
      '';

      postStart = ''
        while [ ! -S $SOCKET ]; do
          sleep 0.5
        done
        chmod a+w $SOCKET
      '';

      postStop = ''
        rm $SOCKET
      '';

      serviceConfig = {
        User = "mastodon";
        EnvironmentFile = mastodon.config;
        PrivateTmp = true;
        Restart = "always";
        TimeoutSec = 15;
        Type = "simple";
        WorkingDirectory = mastodon.railsRoot;
      };

      unitConfig.RequiresMountsFor = mastodon.varDir;
    };

    systemd.services.mastodon-web = {
      description = "Mastodon Web app";
      wantedBy = [ "multi-user.target" ];
      after = [ "network.target" ];

      environment.RAILS_ENV = "production";
      environment.BUNDLE_PATH = "${mastodon.gems}/lib/ruby/gems/2.5.0";
      environment.BUNDLE_GEMFILE = "${mastodon.gems.confFiles}/Gemfile";
      environment.SOCKET = mastodon.railsSocket;

      path = [ mastodon.gems mastodon.gems.ruby pkgs.file ];

      preStart = ''
        ./bin/bundle exec rails db:migrate
      '';

      script = ''
        exec ./bin/bundle exec puma -C config/puma.rb
      '';

      serviceConfig = {
        User = "mastodon";
        EnvironmentFile = mastodon.config;
        PrivateTmp = true;
        Restart = "always";
        TimeoutSec = 60;
        Type = "simple";
        WorkingDirectory = mastodon.railsRoot;
      };

      unitConfig.RequiresMountsFor = mastodon.varDir;
    };

    systemd.services.mastodon-sidekiq = {
      description = "Mastodon Sidekiq";
      wantedBy = [ "multi-user.target" ];
      after = [ "network.target" "mastodon-web.service" ];

      environment.RAILS_ENV="production";
      environment.BUNDLE_PATH = "${mastodon.gems}/${mastodon.gems.ruby.gemPath}";
      environment.BUNDLE_GEMFILE = "${mastodon.gems.confFiles}/Gemfile";
      environment.DB_POOL="5";

      path = [ mastodon.gems mastodon.gems.ruby pkgs.imagemagick pkgs.ffmpeg pkgs.file ];

      script = ''
        exec ./bin/bundle exec sidekiq -c 5 -q default -q mailers -q pull -q push
      '';

      serviceConfig = {
        User = "mastodon";
        EnvironmentFile = mastodon.config;
        PrivateTmp = true;
        Restart = "always";
        TimeoutSec = 15;
        Type = "simple";
        WorkingDirectory = mastodon.railsRoot;
      };

      unitConfig.RequiresMountsFor = mastodon.varDir;
    };

    system.activationScripts.mastodon = {
      deps = [ "users" ];
      text = ''
      install -m 0755 -o mastodon -g mastodon -d ${mastodon.socketsDir}
      install -m 0755 -o mastodon -g mastodon -d ${mastodon.varDir} ${mastodon.varDir}/tmp/cache
      '';
    };

    services.myWebsites.tools.modules = [
      "headers" "proxy" "proxy_wstunnel" "proxy_http"
    ];
    security.acme.certs."eldiron".extraDomains."mastodon.immae.eu" = null;
    system.extraSystemBuilderCmds = ''
      mkdir -p $out/webapps
      ln -s ${mastodon.railsRoot}/public/ $out/webapps/tools_mastodon
      '';
    services.myWebsites.tools.vhostConfs.mastodon = {
      certName    = "eldiron";
      hosts       = ["mastodon.immae.eu" ];
      root        = root;
      extraConfig = [ ''
        Header always set Referrer-Policy "strict-origin-when-cross-origin"
        Header always set Strict-Transport-Security "max-age=31536000"

        <LocationMatch "^/(assets|avatars|emoji|headers|packs|sounds|system)>
          Header always set Cache-Control "public, max-age=31536000, immutable"
          Require all granted
        </LocationMatch>

        ProxyPreserveHost On
        RequestHeader set X-Forwarded-Proto "https"

        RewriteEngine On

        ProxyPass /500.html !
        ProxyPass /sw.js !
        ProxyPass /embed.js !
        ProxyPass /robots.txt !
        ProxyPass /manifest.json !
        ProxyPass /browserconfig.xml !
        ProxyPass /mask-icon.svg !
        ProxyPassMatch ^(/.*\.(png|ico|gif)$) !
        ProxyPassMatch ^/(assets|avatars|emoji|headers|packs|sounds|system|.well-known/acme-challenge) !

        RewriteRule ^/api/v1/streaming/(.+)$ unix://${mastodon.nodeSocket}|http://mastodon.immae.eu/api/v1/streaming/$1 [P,NE,QSA,L]
        RewriteRule ^/api/v1/streaming/$ unix://${mastodon.nodeSocket}|ws://mastodon.immae.eu/ [P,NE,QSA,L]
        ProxyPass / unix://${mastodon.railsSocket}|http://mastodon.immae.eu/
        ProxyPassReverse / unix://${mastodon.railsSocket}|http://mastodon.immae.eu/

        Alias /system ${mastodon.varDir}

        <Directory ${mastodon.varDir}>
          Require all granted
          Options -MultiViews
        </Directory>

        <Directory ${root}>
          Require all granted
          Options -MultiViews +FollowSymlinks
        </Directory>

        ErrorDocument 500 /500.html
        ErrorDocument 501 /500.html
        ErrorDocument 502 /500.html
        ErrorDocument 503 /500.html
        ErrorDocument 504 /500.html
      '' ];
    };
  };
}