# Edit this configuration file to define what should be installed on
# your system.  Help is available in the configuration.nix(5) man page
# and in the NixOS manual (accessible by running ‘nixos-help’).

{ config, pkgs, ... }:

let
  fqdn =
    let
      join = hostName: domain: hostName + ".${domain}";
    in join config.networking.hostName config.networking.domain;
in {
  imports =
    [ # Include the results of the hardware scan.
      ./hardware-configuration.nix
    ];

  # Boot
  boot.loader.grub.enable = false;
  boot.loader.raspberryPi.enable = true;
  boot.loader.raspberryPi.version = 4;

  # Kernel configuration
  boot.kernelPackages = pkgs.linuxPackages_rpi4;
  boot.kernelParams = ["cma=64M" "console=tty0"];

  # Enable additional firmware (such as Wi-Fi drivers).
  hardware.enableRedistributableFirmware = true;

  networking.hostName = "bib3"; # Define your hostname.
  networking.domain = "de";
  # networking.wireless.enable = true;  # Enables wireless support via wpa_supplicant.

  # The global useDHCP flag is deprecated, therefore explicitly set to false here.
  # Per-interface useDHCP will be mandatory in the future, so this generated config
  # replicates the default behaviour.
  networking.useDHCP = false;
  networking.interfaces.eth0.useDHCP = true;
  networking.interfaces.wlan0.useDHCP = true;

  security.acme.email = "webmaster@bib3.de";
  security.acme.acceptTerms = true;

  # Select internationalisation properties.
  # i18n.defaultLocale = "en_US.UTF-8";
  # console = {
  #   font = "Lat2-Terminus16";
  #   keyMap = "us";
  # };

  # Set your time zone.
  time.timeZone = "UTC";

  # Some programs need SUID wrappers, can be configured further or are
  # started in user sessions.
  # programs.mtr.enable = true;
  # programs.gnupg.agent = {
  #   enable = true;
  #   enableSSHSupport = true;
  #   pinentryFlavor = "gnome3";
  # };

  # List services that you want to enable:

  # Enable the OpenSSH daemon.
  services.openssh.enable = true;
  networking.firewall.allowedTCPPorts = [ 22 80 443 ];

  services.postgresql = {
    enable = true;
    ensureDatabases = [ "nextcloud" ];
    ensureUsers = [
      { name = "nextcloud";
        ensurePermissions."DATABASE nextcloud" = "ALL PRIVILEGES";
      }
    ];
    initialScript = pkgs.writeText "synapse-init.sql" ''
      CREATE ROLE "matrix-synapse" WITH LOGIN PASSWORD 'synapse';
      CREATE DATABASE "matrix-synapse" WITH OWNER "matrix-synapse"
        TEMPLATE template0
        LC_COLLATE = "C"
        LC_CTYPE = "C";
    '';
  };

  services.nginx = {
    enable = true;
    # only recommendedProxySettings and recommendedGzipSettings are strictly required,
    # but the rest make sense as well
    recommendedTlsSettings = true;
    recommendedOptimisation = true;
    recommendedGzipSettings = true;
    recommendedProxySettings = true;

    virtualHosts = {
      "default_server" = {
        root = "/var/www/default"; 
      };

      # This host section can be placed on a different host than the rest,
      # i.e. to delegate from the host being accessible as ${config.networking.domain}
      # to another host actually running the Matrix homeserver.
      "${config.networking.domain}" = {
        locations."= /.well-known/matrix/server".extraConfig =
          let
            # use 443 instead of the default 8448 port to unite
            # the client-server and server-server port for simplicity
            server = { "m.server" = "${fqdn}:443"; };
          in ''
            add_header Content-Type application/json;
            return 200 '${builtins.toJSON server}';
          '';
        locations."= /.well-known/matrix/client".extraConfig =
          let
            client = {
              "m.homeserver" =  { "base_url" = "https://${fqdn}"; };
              "m.identity_server" =  { "base_url" = "https://vector.im"; };
            };
          # ACAO required to allow element-web on any URL to request this json file
          in ''
            add_header Content-Type application/json;
            add_header Access-Control-Allow-Origin *;
            return 200 '${builtins.toJSON client}';
          '';
      };

      # Reverse proxy for Matrix client-server and server-server communication
      ${fqdn} = {
        enableACME = true;
        forceSSL = true;

        # Or do a redirect instead of the 404, or whatever is appropriate for you.
        # But do not put a Matrix Web client here! See the Element web section below.
        locations."/".extraConfig = ''
          return 404;
        '';

        # forward all Matrix API calls to the synapse Matrix homeserver
        locations."/_matrix" = {
          proxyPass = "http://[::1]:8008"; # without a trailing /
        };
      };

      "nextcloud.${fqdn}" = {
        forceSSL = true;
        enableACME = true;
      };
    };
  };

  services.matrix-synapse = {
    enable = true;
    server_name = config.networking.domain;
    listeners = [
      {
        port = 8008;
        bind_address = "::1";
        type = "http";
        tls = false;
        x_forwarded = true;
        resources = [
          {
            names = [ "client" "federation" ];
            compress = false;
          }
        ];
      }
    ];
  };

  services.nextcloud = {
    enable = true;
    hostName = "nextcloud." + fqdn;
    nginx.enable = true;
    config = {
      dbtype = "pgsql";
      dbuser = "nextcloud";
      dbhost = "/run/postgresql";
      dbname = "nextcloud";
      adminpassFile = "/var/lib/nextcloud/config/adminpass";
      adminuser = "root";
    };
  };

  systemd.services."nextcloud-setup" = {
    requires = [ "postgresql.service" ];
    after = [ "postgresql.service" ];
  };

  # Define a user account. Don't forget to set a password with ‘passwd’.
  users.users.loooph = {
    isNormalUser = true;
    home = "/home/loooph";
    extraGroups = [ "wheel" ]; # Enable ‘sudo’ for the user.
    openssh.authorizedKeys.keys = [ "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIBCboBeXmDWM6Em3hwvAbbHbAmSV0fY+95Q+cM9ocx0a loooph@Loooph-Desktop" ];
  };

  nix.gc.automatic = true;
  nix.gc.options = "--delete-older-than 30d";

  # This value determines the NixOS release from which the default
  # settings for stateful data, like file locations and database versions
  # on your system were taken. It‘s perfectly fine and recommended to leave
  # this value at the release version of the first install of this system.
  # Before changing this value read the documentation for this option
  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
  system.stateVersion = "20.03"; # Did you read the comment?

  # List packages installed in system profile. To search, run:
  # $ nix search wget
  environment.systemPackages = with pkgs; [
    wget vim git htop tmux openssl
  ];

}