{ lib, pkgs, config, ... }:

let
  cfg = config.this.apache;
  inherit (lib.attrsets)
    mergeAttrsList;
  inherit (builtins)
    map readFile pathExists;
in
{
  options = {
    this.apache = {
      enable = lib.mkEnableOption "the Apache HTTP Server";
      vhosts = lib.mkOption {
        type = with lib.types; listOf str;
        default = [];
      };
    };
  };

  config = lib.mkIf cfg.enable {
    services.httpd = {
      enable = true;
      logPerVirtualHost = false;
      logDir = "/var/log/apache2";
      virtualHosts = mergeAttrsList (map
        (name: { "${name}" =
                   { extraConfig = readFile ./${name}.conf; }
                   // (if pathExists ./${name}.nix
                       then import ./${name}.nix { inherit lib pkgs config; }
                       else {});})
        cfg.vhosts);
    };
  };
}