{ config, lib, pkgs, paths, self, keys, ... }:

let
  # Backlight fallback for CM5 display quirk
  # The kernel driver usually handles this, but some boots need a kick
  backlightFixScript = pkgs.writeShellScript "backlight-fix" ''
    # Try sysfs backlight control
    for bl in /sys/class/backlight/*/brightness; do
      if [ -f "$bl" ]; then
        max=$(cat "$(dirname "$bl")/max_brightness" 2>/dev/null || echo 100)
        echo "$max" > "$bl" 2>/dev/null || true
      fi
    done
  '';
in

{
  # Basic Host Info
  networking.hostName = "uConsole";
  time.timeZone = "America/Montreal";
  i18n.defaultLocale = "en_CA.UTF-8";

  # System State
  system.stateVersion = "25.05";

  # Boot & Hardware (migrated to kernel bootloader per nixos-raspberrypi deprecation notice)
  boot.loader.raspberry-pi.bootloader = "kernel";
  # kernel managed by nixos-raspberrypi module — don't override, patches are version-specific
  # boot.kernelPackages = pkgs.linuxPackages_latest;

  # Use kernel built-in console font — ter-v24n from nixos-uconsole is garbled on CM5
  console.font = lib.mkForce "Lat2-Terminus16";
  console.packages = lib.mkForce [ ];

  # Networking
  networking.networkmanager.enable = true;
  services.openssh = {
    enable = true;
    # TODO: lock down after first deployment
    settings.PermitRootLogin = lib.mkForce "yes";
    settings.PasswordAuthentication = lib.mkForce true;
  };

  # User
  users.users.gortium = {
    isNormalUser = true;
    extraGroups = [ "wheel" "networkmanager" "video" "dialout" "kismet" ];
    openssh.authorizedKeys.keys = [
      keys.users.gortium.main
      keys.users.gortium.gitea
    ];
  };
  security.sudo.extraRules = [
    {
      users = [ "gortium" ];
      commands = [
        {
          command = "ALL";
          options = [ "NOPASSWD" ];
        }
      ];
    }
  ];

  # ============================================================
  # Package groups
  # ============================================================

  environment.systemPackages = with pkgs; [
    # ===== Base =====
    emacs-pgtk
    git
    ripgrep
    fd
    htop
    tmux
    neovim
    libgpiod                    # GPIO control (for internal USB hub, AIO modules)

    # ===== HAM Radio =====
    js8call
    wsjtx
    fldigi
    pat                        # Winlink client
    direwolf                   # AX.25 packet modem
    chirp                      # Radio programming tool
    hamlib                     # Ham radio control libraries
    trustedqsl                 # Logbook of the World (LoTW)

    # ===== SDR / RF =====
    sdrpp                      # SDR++ spectrum analyzer
    gqrx                       # SDR receiver GUI
    rtl-sdr                    # RTL-SDR drivers & utilities
    inspectrum                # Offline signal analysis
    soapysdr-with-plugins      # SoapySDR + hardware support plugins

    # ===== Mesh / LoRa =====
    # meshtastic not available in nixpkgs 25.11 stable; install manually:
    # nix shell nixpkgs#meshtastic -c meshtastic
    reticulumStack             # Reticulum Network Stack (rnsd, rnsh, rncp, rnx, rnpath, etc.)
    lxmf                       # LXMF messaging protocol
    nomadnet                   # Nomad Network client

    # ===== Security =====
    nmap
    aircrack-ng
    kismet                     # Wi-Fi monitor / IDS
    bettercap                  # MITM/network attack framework
    wireshark                  # Packet analyzer
    hashcat                    # GPU password cracker
    john                       # John the Ripper
    sqlmap                     # SQL injection tool

    # ===== GPS / Maps =====
    foxtrotgps
    viking                     # GPS map editor
    gpsbabel                   # GPS data conversion
  ];

  # Packages noted but not in unstable nixpkgs:
  #   - metasploit: unfree; install manually via Git clone
  #   - burpsuite: unfree Java app (Community Edition available for download)
  #   - sidechannel: not a distinct PyPI package; functionality covered by
  #     the Reticulum stack. For LXMF GUI client, install Sideband manually
  #     from github.com/markqvist/Sideband

  # ============================================================
  # Reticulum Service (rnsd)
  # ============================================================
  systemd.services.rnsd = {
    description = "Reticulum Network Stack Daemon";
    wants = [ "network-online.target" ];
    after = [ "network-online.target" ];
    wantedBy = [ "multi-user.target" ];
    serviceConfig = {
      User = "gortium";
      Group = "gortium";
      ExecStart = "${pkgs.reticulumStack}/bin/rnsd";
      Restart = "always";
      RestartSec = "10s";
      LimitNOFILE = 65536;
    };
  };

  # ============================================================
  # Kismet Service (Wi-Fi monitoring / mesh node)
  # ============================================================
  systemd.services.kismet = {
    description = "Kismet Wi-Fi Monitor & IDS";
    wants = [ "network-online.target" ];
    after = [ "network-online.target" ];
    wantedBy = [ "multi-user.target" ];
    serviceConfig = {
      User = "gortium";
      Group = "kismet";
      ExecStart = "${pkgs.kismet}/bin/kismet -c wlan0 --log-base=/home/gortium/kismet_logs --no-nc-ui";
      Restart = "always";
      RestartSec = "10s";
    };
  };

  # ============================================================
  # Kernel modules for SDR, radio, and WiFi
  # ============================================================
  boot.kernelModules = [
    "mt7921u"         # MediaTek MT7921 USB WiFi (uConsole AC1200)
    "88x2bu"          # Realtek 8812/8821BU USB WiFi (common adapter)
    "rtl8xxxu"        # RTL8188/8192/8723 USB WiFi
    "rtl2832_sdr"     # RTL-SDR kernel module
    "dvb_usb_rtl28xxu" # RTL-SDR DVB-T
  ];

  boot.blacklistedKernelModules = [ ];

  # ============================================================
  # Extra udev rules for SDR and HAM radio devices
  # ============================================================
  services.udev.packages = with pkgs; [ rtl-sdr ];



  # ============================================================
  # Enable IPv6 for Reticulum mesh
  # ============================================================
  networking.enableIPv6 = true;

  # ============================================================
  # Firewall: open ports for Reticulum (optional)
  # ============================================================
  networking.firewall.allowedTCPPorts = [ 22 ]; # SSH only
  networking.firewall.allowedUDPPorts = [ ];
  # Reticulum uses its own encryption and doesn't need open ports
  # for basic mesh operations (peer-to-peer discovery).
  # For TCP interfaces, open additional ports as needed.

  # ============================================================
  # Display & Desktop (Hyprland Wayland compositor)
  # ============================================================
  programs.hyprland = {
    enable = true;
    xwayland.enable = true;
  };
  services.displayManager.sddm = {
    enable = true;
    wayland.enable = true;
  };

  # ============================================================
  # CM5 Display Backlight Fix
  # The kernel driver initializes backlight, but some boots fail.
  # This service kicks it after boot as a reliable fallback.
  # ============================================================
  systemd.services.cm5-backlight-fix = {
    description = "CM5 Display Backlight Fix";
    after = [ "multi-user.target" ];
    wantedBy = [ "multi-user.target" ];
    serviceConfig = {
      Type = "oneshot";
      ExecStart = "${backlightFixScript}";
    };
  };

  # ============================================================
  # Internal USB Hub Enable (GPIO 23) — DISABLED
  # This service freeze the CM5 because gpioset 0 23=1 writes
  # to the wrong GPIO chip (BCM2712 native, not RP1).
  # Enable manually after boot once the correct chip is confirmed:
  #   gpioset 0 23=1   # on chip 0 (BCM2712, CORE_VOLT or critical)
  #   gpioset 512 23=1 # on chip 512 (RP1, likely correct)
  # ============================================================
  # systemd.services.enable-gpio23-usb-hub = {
  #   description = "Enable Internal USB Hub (GPIO 23)";
  #   before = [ "network.target" ];
  #   wantedBy = [ "multi-user.target" ];
  #   serviceConfig = {
  #     Type = "oneshot";
  #     RemainAfterExit = true;
  #     ExecStart = "${pkgs.libgpiod}/bin/gpioset 0 23=1";
  #     ExecStop = "${pkgs.libgpiod}/bin/gpioset 0 23=0";
  #   };
  # };
}