# This file defines the options that can be used both for the Apache
# main server configuration, and for the virtual hosts.  (The latter
# has additional options that affect the web server as a whole, like
# the user/group to run under.)

{options, config, pkgs, ...}:

let
  inherit (pkgs.lib) mkOption addDefaultOptionValues types;

  mainServerArgs = {
    config = config.services.httpd;
    options = options.services.httpd;
  };


  perServerOptions = {forMainServer}: {config, ...}: {

    hostName = mkOption {
      default = "localhost";
      description = "
        Canonical hostname for the server.
      ";
    };

    serverAliases = mkOption {
      default = [];
      example = ["www.example.org" "www.example.org:8080" "example.org"];
      description = "
        Additional names of virtual hosts served by this virtual host configuration.
      ";
    };

    port = mkOption {
      default = if config.enableSSL then 443 else 80;
      type = with types; uniq int;
      description = "
        Port for the server.  The default port depends on the
        <option>enableSSL</option> option of this server. (80 for http and
        443 for https).
      ";
    };

    enableSSL = mkOption {
      default = false;
      description = "
        Whether to enable SSL (https) support.
      ";
    };

    # Note: sslServerCert and sslServerKey can be left empty, but this
    # only makes sense for virtual hosts (they will inherit from the
    # main server).
    
    sslServerCert = mkOption {
      default = ""; 
      example = "/var/host.cert";
      description = "
        Path to server SSL certificate.
      ";
    };

    sslServerKey = mkOption {
      default = "";
      example = "/var/host.key";
      description = "
        Path to server SSL certificate key.
      ";
    };

    adminAddr = mkOption ({
      example = "admin@example.org";
      description = "
        E-mail address of the server administrator.
      ";
    } // (if forMainServer then {} else {default = "";}));

    documentRoot = mkOption {
      default = null;
      example = "/data/webserver/docs";
      description = "
        The path of Apache's document root directory.  If left undefined,
        an empty directory in the Nix store will be used as root.
      ";
    };

    servedDirs = mkOption {
      default = [];
      example = [
        { urlPath = "/nix";
          dir = "/home/eelco/Dev/nix-homepage";
        }
      ];
      description = "
        This option provides a simple way to serve static directories.
      ";
    };

    servedFiles = mkOption {
      default = [];
      example = [
        { urlPath = "/foo/bar.png";
          dir = "/home/eelco/some-file.png";
        }
      ];
      description = "
        This option provides a simple way to serve individual, static files.
      ";
    };

    extraConfig = mkOption {
      default = "";
      example = ''
        <Directory /home>
          Options FollowSymlinks
          AllowOverride All
        </Directory>
      '';
      description = "
        These lines go to httpd.conf verbatim. They will go after
        directories and directory aliases defined by default.
      ";
    };

    enableUserDir = mkOption {
      default = false;
      description = "
        Whether to enable serving <filename>~/public_html</filename> as
        <literal>/~<replaceable>username</replaceable></literal>.
      ";
    };

    globalRedirect = mkOption {
      default = "";
      example = http://newserver.example.org/;
      description = "
        If set, all requests for this host are redirected permanently to
        the given URL.
      ";
    };

  };


  vhostOptions = perServerOptions {
    forMainServer = false;
  };

in

{
  options = {
    services.httpd = {

      virtualHosts = mkOption {
        default = [];
        example = [
          { hostName = "foo";
            documentRoot = "/data/webroot-foo";
          }
          { hostName = "bar";
            documentRoot = "/data/webroot-bar";
          }
        ];
        type = with types; listOf optionSet;
        description = ''
          Specification of the virtual hosts served by Apache.  Each
          element should be an attribute set specifying the
          configuration of the virtual host.  The available options
          are the non-global options permissible for the main host.
        '';

        options = [
          vhostOptions
        ];
      };

    }
    // perServerOptions {forMainServer = true;} mainServerArgs
    ;
  };
}