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

  errorPages = pkgs.fetchgit {
    url = "https://git.ingolf-wagner.de/palo/http-errors.git";
    rev = "74b8e4c1d9bbba3db6ad858b888e1867318af1f0";
    sha256 = "0czdzafx4k76q773lyf3vsjm74g1995iz542dhw15kpy5xbivsrg";
  };

  error = {
    extraConfig = ''
      error_page 400 /errors/400.html;
      error_page 401 /errors/401.html;
      error_page 402 /errors/402.html;
      error_page 403 /errors/403.html;
      error_page 404 /errors/404.html;
      error_page 405 /errors/405.html;
      error_page 406 /errors/406.html;
      error_page 500 /errors/500.html;
      error_page 501 /errors/501.html;
      error_page 502 /errors/502.html;
      error_page 503 /errors/503.html;
      error_page 504 /errors/504.html;
    '';
    locations."^~ /errors/" = {
      extraConfig = "internal;";
      root = "${errorPages}/";
    };
  };
in {

  networking.firewall.allowedTCPPorts =
    [ 80 443 4443 config.services.taskserver.listenPort ];
  networking.firewall.allowedUDPPorts =
    [ 80 443 4443 config.services.taskserver.listenPort ];

  services.nginx = {
    enable = true;
    recommendedProxySettings = true;
    virtualHosts = {

      "git.ingolf-wagner.de" = {
        listen = [
          {
            addr = "0.0.0.0";
            port = 4443;
            ssl = true;
          }
          {
            addr = "0.0.0.0";
            port = 80;
            ssl = false;
          }
        ];
        forceSSL = true;
        enableACME = true;
        extraConfig = error.extraConfig;

        locations = {
          "/" = {
            proxyPass = "http://workhorse.private:3000";
            extraConfig = ''
              if ($request_method = 'OPTIONS') {
              add_header 'Access-Control-Allow-Origin' '*';
              add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
              #
              # Custom headers and headers various browsers *should* be OK with but aren't
              #
              add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';
              #
              # Tell client that this pre-flight info is valid for 20 days
              #
              add_header 'Access-Control-Max-Age' 1728000;
              add_header 'Content-Type' 'text/plain; charset=utf-8';
              add_header 'Content-Length' 0;
              return 204;
              }
              if ($request_method = 'POST') {
                add_header 'Access-Control-Allow-Origin' '*';
                add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
                add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';
                add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range';
              }
              if ($request_method = 'GET') {
                add_header 'Access-Control-Allow-Origin' '*';
                add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
                add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';
                add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range';
              }
            '';
          };
        } // error.locations;
      };

      "paste.ingolf-wagner.de" = {
        listen = [
          {
            addr = "0.0.0.0";
            port = 4443;
            ssl = true;
          }
          {
            addr = "0.0.0.0";
            port = 80;
            ssl = false;
          }
        ];
        forceSSL = true;
        enableACME = true;
        extraConfig = error.extraConfig;
        locations = {
          "/" = { proxyPass = "http://workhorse.private:8000"; };
        } // error.locations;
      };

      "travel.ingolf-wagner.de" = {
        listen = [
          {
            addr = "0.0.0.0";
            port = 4443;
            ssl = true;
          }
          {
            addr = "0.0.0.0";
            port = 80;
            ssl = false;
          }
        ];
        forceSSL = true;
        enableACME = true;
        extraConfig = error.extraConfig;
        locations = {
          "/" = {
            root = "/srv/www/travel";
            extraConfig = ''
              if (-d $request_filename) {
                rewrite [^/]$ $scheme://$http_host$request_uri/ permanent;
              }
            '';
          };
        } // error.locations;
      };

      "tech.ingolf-wagner.de" = {
        listen = [
          {
            addr = "0.0.0.0";
            port = 4443;
            ssl = true;
          }
          {
            addr = "0.0.0.0";
            port = 80;
            ssl = false;
          }
        ];
        forceSSL = true;
        enableACME = true;
        extraConfig = error.extraConfig;
        locations = {
          "/" = {
            root = "/srv/www/tech";
            extraConfig = ''
              if (-d $request_filename) {
                rewrite [^/]$ $scheme://$http_host$request_uri/ permanent;
              }
            '';
          };
        } // error.locations;
      };

      "terranix.org" = {
        listen = [
          {
            addr = "0.0.0.0";
            port = 4443;
            ssl = true;
          }
          {
            addr = "0.0.0.0";
            port = 80;
            ssl = false;
          }
        ];
        forceSSL = true;
        enableACME = true;
        extraConfig = error.extraConfig;
        locations = {
          "/" = {
            root = "/srv/www/terranix";
            extraConfig = ''
              if (-d $request_filename) {
                rewrite [^/]$ $scheme://$http_host$request_uri/ permanent;
              }
            '';
          };
        } // error.locations;
      };

      #"chat.ingolf-wagner.de" = {
      #  listen = [
      #    {
      #      addr = "0.0.0.0";
      #      port = 4443;
      #      ssl = true;
      #    }
      #    {
      #      addr = "0.0.0.0";
      #      port = 80;
      #      ssl = false;
      #    }
      #  ];
      #  forceSSL = true;
      #  enableACME = true;
      #  extraConfig = error.extraConfig;
      #  locations = {
      #    "/" = {
      #      proxyPass = "http://chat.workhorse.private";
      #      proxyWebsockets = true;
      #      extraConfig = ''
      #        sub_filter "http://chat.ingolf-wagner.de" "https://chat.ingolf-wagner.de";
      #        sub_filter "chat.workhorse.private" "chat.ingolf-wagner.de";
      #      '';
      #    };
      #  } // error.locations;
      #};

      "nextcloud.ingolf-wagner.de" = {
        listen = [
          {
            addr = "0.0.0.0";
            port = 4443;
            ssl = true;
          }
          {
            addr = "0.0.0.0";
            port = 80;
            ssl = false;
          }
        ];
        forceSSL = true;
        enableACME = true;
        extraConfig = error.extraConfig;
        locations = {
          "/" = {
            proxyPass = "http://nextcloud.workhorse.private";
            extraConfig = ''
              sub_filter "http://nextcloud.ingolf-wagner.de" "https://nextcloud.ingolf-wagner.de";
              sub_filter "nextcloud.workhorse.private" "nextcloud.ingolf-wagner.de";
              # used for view/edit office file via Office Online Server
              client_max_body_size 0;
            '';
          };
          "= /.well-known/carddav" = {
            priority = 210;
            extraConfig = "return 301 $scheme://$host/remote.php/dav;";
          };
          "= /.well-known/caldav" = {
            priority = 210;
            extraConfig = "return 301 $scheme://$host/remote.php/dav;";
          };

        } // error.locations;
      };

      "gaykraft.com" = {
        listen = [
          {
            addr = "0.0.0.0";
            port = 4443;
            ssl = true;
          }
          {
            addr = "0.0.0.0";
            port = 80;
            ssl = false;
          }
        ];
        forceSSL = true;
        enableACME = true;
        extraConfig = error.extraConfig;
        locations = {
          "/" = { root = "/srv/www/gaykraft"; };
        } // error.locations;
      };

      #"home.ingolf-wagner.de" = {
      #  listen = [
      #    {
      #      addr = "0.0.0.0";
      #      port = 4443;
      #      ssl = true;
      #    }
      #    {
      #      addr = "0.0.0.0";
      #      port = 80;
      #      ssl = false;
      #    }
      #  ];
      #  extraConfig = ''
      #    proxy_buffering off;
      #    # client certificate
      #    ssl_client_certificate ${<secrets/client-cert/ca.crt>};
      #    # make verification optional, so we can display a 403 message to those
      #    # who fail authentication
      #    ssl_verify_client optional;
      #  '';
      #  forceSSL = true;
      #  enableACME = true;
      #  locations."/" = {
      #    proxyPass = "http://pepe.private:8123";
      #    proxyWebsockets = true;
      #    extraConfig = ''
      #      # if the client-side certificate failed to authenticate, show a 403
      #      # message to the client
      #      if ($ssl_client_verify != SUCCESS) {
      #        return 403;
      #      }
      #      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      #      proxy_set_header Upgrade $http_upgrade;
      #      proxy_set_header Connection $connection_upgrade;
      #    '';
      #  };
      #};

    };
  };

  services.sslh = {
    enable = true;
    listenAddresses = [ "0.0.0.0" ];
    port = 443;
    verbose = true;
    transparent = true;
    # List of protocols
    #
    # Each protocol entry consists of:
    #   name: name of the probe. These are listed on the command line (ssh -?), plus 'regex' and 'timeout'.
    #   service: (optional) libwrap service name (see hosts_access(5))
    #   host, port: where to connect when this probe succeeds
    #   log_level:  0 to turn off logging
    #               1 to log each incoming connection
    #   keepalive:  Should TCP keepalive be on or off for that
    #               connection (default is off)
    #   fork: Should a new process be forked for this protocol?
    #         (only useful for sslh-select)
    #   tfo_ok: Set to true if the server supports TCP FAST OPEN
    #
    #  Probe-specific options:
    # (sslh will try each probe in order they are declared, and
    # connect to the first that matches.)
    #
    #       tls:
    #               sni_hostnames:  list of FQDN for that target
    #               alpn_protocols: list of ALPN protocols for that target, see:
    #               https://www.iana.org/assignments/tls-extensiontype-values/tls-extensiontype-values.xhtml#alpn-protocol-ids
    #
    #               if both sni_hostnames AND alpn_protocols are specified, both must match
    #
    #               if neither are set, it is just checked whether this is the TLS protocol or not
    #
    #               Obviously set the most specific probes
    #               first, and if you use TLS with no ALPN/SNI
    #               set it as the last TLS probe
    #       regex:
    #               regex_patterns: list of patterns to match for
    #               that target.
    #
    # You can specify several of 'regex' and 'tls'.
    appendConfig = ''
      protocols:
      (
        { name: "ssh"; service: "ssh"; host: "localhost"; port: "2222";},
        { name: "tls";                 host: "localhost"; port: "4443";},
        { name: "tinc";                host: "localhost"; port: "655"; }
      );
    '';
  };

  systemd.services."socat-proxy" = {
    wantedBy = [ "sslh.service" "multi-user.target" ];
    after = [ "sslh.service" ];
    script = ''
      ${pkgs.socat}/bin/socat TCP-LISTEN:2222,fork TCP:workhorse.private:2222
    '';
  };

  systemd.services."socat-taskd" = {
    wantedBy = [ "multi-user.target" ];
    script = let port = toString config.services.taskserver.listenPort;
    in ''
      ${pkgs.socat}/bin/socat TCP-LISTEN:${port},fork TCP:workhorse.private:${port}
    '';
  };

}