{config, lib, pkgs, ...}:
{
  options = {
    services.discourse = {
      hostname = lib.mkOption {
        type = lib.types.str;
      };

      config = lib.mkOption {
        type = lib.types.str;
        default =
          ''
            ## this is the all-in-one, standalone Discourse Docker container template
            ##
            ## After making changes to this file, you MUST rebuild
            ## /var/discourse/launcher rebuild app
            ##
            ## BE *VERY* CAREFUL WHEN EDITING!
            ## YAML FILES ARE SUPER SUPER SENSITIVE TO MISTAKES IN WHITESPACE OR ALIGNMENT!
            ## visit http://www.yamllint.com/ to validate this file as needed

            templates:
              - "templates/postgres.template.yml"
              - "templates/redis.template.yml"
              - "templates/web.template.yml"
              - "templates/web.ratelimited.template.yml"
            ## Uncomment these two lines if you wish to add Lets Encrypt (https)
              #- "templates/web.ssl.template.yml"
              #- "templates/web.letsencrypt.ssl.template.yml"

            ## which TCP/IP ports should this container expose?
            ## If you want Discourse to share a port with another webserver like Apache or nginx,
            ## see https://meta.discourse.org/t/17247 for details
            expose:
              - "80:80"   # http
              - "443:443" # https

            params:
              db_default_text_search_config: "pg_catalog.english"

              ## Set db_shared_buffers to a max of 25% of the total memory.
              ## will be set automatically by bootstrap based on detected RAM, or you can override
              db_shared_buffers: "256MB"

              ## can improve sorting performance, but adds memory usage per-connection
              #db_work_mem: "40MB"

              ## Which Git revision should this container use? (default: tests-passed)
              #version: tests-passed

            env:
              LANG: en_US.UTF-8
              # DISCOURSE_DEFAULT_LOCALE: en

              ## How many concurrent web requests are supported? Depends on memory and CPU cores.
              ## will be set automatically by bootstrap based on detected CPUs, or you can override
              UNICORN_WORKERS: 2

              ## TODO: The domain name this Discourse instance will respond to
              DISCOURSE_HOSTNAME: ${config.networking.domain}

              ## Uncomment if you want the container to be started with the same
              ## hostname (-h option) as specified above (default "$hostname-$config")
              #DOCKER_USE_HOSTNAME: true

              ## TODO: List of comma delimited emails that will be made admin and developer
              ## on initial signup example 'user1@example.com,user2@example.com'
              DISCOURSE_DEVELOPER_EMAILS: 'julm@autogeree.net'

              ## TODO: The SMTP mail server used to validate new accounts and send notifications
              DISCOURSE_SMTP_ADDRESS: smtp.${config.networking.domain}
              DISCOURSE_SMTP_PORT: 2525
              DISCOURSE_SMTP_USER_NAME: discourse@${config.networking.domain}
              DISCOURSE_SMTP_PASSWORD: password
              #DISCOURSE_SMTP_ENABLE_START_TLS: true           # (optional, default true)

              ## If you added the Lets Encrypt template, uncomment below to get a free SSL certificate
              #LETSENCRYPT_ACCOUNT_EMAIL: me@example.com

              ## The CDN address for this Discourse instance (configured to pull)
              ## see https://meta.discourse.org/t/14857 for details
              #DISCOURSE_CDN_URL: //discourse-cdn.example.com

            ## The Docker container is stateless; all data is stored in /shared
            volumes:
              - volume:
                  host: /var/discourse/shared/standalone
                  guest: /shared
              - volume:
                  host: /var/discourse/shared/standalone/log/var-log
                  guest: /var/log

            ## Plugins go here
            ## see https://meta.discourse.org/t/19157 for details
            hooks:
              after_code:
                - exec:
                    cd: $home/plugins
                    cmd:
                      - git clone https://github.com/discourse/docker_manager.git
                      - git clone https://github.com/teozkr/discourse-plugin-discord-auth.git

            ## Any custom commands to run after building
            run:
              - exec: echo "Beginning of custom commands"
              ## If you want to set the 'From' email address for your first registration, uncomment and change:
              ## After getting the first signup email, re-comment the line. It only needs to run once.
              - exec: rails r "SiteSetting.notification_email='noreply@${config.networking.domain}'"
              - replace:
                 filename: "/etc/nginx/conf.d/discourse.conf"
                 from: /listen 80;/
                 to: |
                   listen 80;
                   set_real_ip_from 0.0.0.0/0;
              - exec: echo "End of custom commands"
          '';
      };
    };
  };

  config = {
    virtualisation.docker.enable = true;
    #networking.firewall.enable = false;
    environment.systemPackages = [ pkgs.git ];
    systemd.services.discourse-setup = {
      wants = [ "docker.service" ];
      after = [ "network.target" "docker.service" ];
      wantedBy = [ "multi-user.target" ];
      path = [ pkgs.git pkgs.bash pkgs.nettools pkgs.which pkgs.gawk pkgs.docker ];
      script =
      ''
        if [[ ! -e /var/discourse ]]; then
          git clone --depth 1 https://github.com/discourse/discourse_docker.git /var/discourse
        fi
        cp ${pkgs.writeText "discourse-app.yml" config.services.discourse.config} \
         /var/discourse/containers/app.yml
        cd /var/discourse
        git pull --depth 1
        bash ./launcher rebuild app
      '';
      serviceConfig = {
        Type = "simple";
        RemainAfterExit = "yes";
      };
    };
  };
}