{ lib, config , ... }:
with lib;
let
  eachSite = config.services.staticWebsites.sites;
  website = { name, ... }: {
    options = {
      root = mkOption {
        type = types.path;
        default = "/var/lib/nginx/static/${name}";
        description = "Static files path for the website";
      };
      hostname = mkOption {
        type = types.str;
        default = name;
        description = "Website hostname";
      };
      location = mkOption {
        type = types.nullOr types.str;
        default = null;
        description = "Add a location rule if not null";
      };
    };
  };
in
{
  options.services.staticWebsites = {
    sites = mkOption {
      type = types.attrsOf (types.submodule website);
      description = "Specification of one or more static websites to serve";
    };
    debug = mkOption {
      type = types.bool;
      default = false;
    };
  };
  config = mkIf (eachSite != {}) {
    services.nginx = {
      enable = true;
      virtualHosts = mapAttrs' ( hostname: conf: {
        name = conf.hostname;
        value = (mkMerge [
          {
            serverName = conf.hostname;
            forceSSL = if config.services.staticWebsites.debug then false else true;
            enableACME = if config.services.staticWebsites.debug then false else true;
          }
  
          (mkIf (conf.location == null) {
            root = conf.root;
          })
  
          (mkIf (conf.location != null) {
            locations = {
              "${conf.location}/" = {
                alias = "${conf.root}/";
              };
            };
          })
  
          ]);
        }) eachSite;
    };
  };
}