# Edit this configuration file to define what should be installed on
# your system.   Help is available in the configuration-knot.nix(5) man page
# and in the NixOS manual (accessible by running 'nixos-help').
{
  config,
  pkgs,
  lib,
  ...
}: let
  home-manager = builtins.fetchTarball "https://github.com/nix-community/home-manager/archive/release-25.11.tar.gz";
in {
  # Home Manager Configuration
  imports = [
    (import "${home-manager}/nixos")
  ];

  ## Ensure that configuration is copied after installing this NixOS image
  system.copySystemConfiguration = true;

  # Use Lix instead of Nix
  nixpkgs.overlays = [
    (final: prev: {
      inherit
        (prev. lixPackageSets.stable)
        nixpkgs-review
        nix-eval-jobs
        nix-fast-build
        colmena
        ;
    })
  ];

  nix. package = pkgs.lixPackageSets.stable. lix;

  # Bootloader - GRUB for Proxmox
  # Bootloader - systemd-boot with UEFI
  boot.loader.grub.enable = lib.mkForce false;
  boot.loader.systemd-boot.enable = true;
  boot.loader.efi.canTouchEfiVariables = false;
  boot.loader.efi.efiSysMountPoint = "/boot";

  # Proxmox configuration
  proxmox.qemuConf = {
    bios = "ovmf"; # Use OVMF for UEFI
  };

  boot.initrd.availableKernelModules = ["virtio_pci" "virtio_scsi" "ahci" "sd_mod"];

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

  # Enable Rsymc
  services.rsync.enable = true;

  # Configure network proxy if necessary
  # networking.proxy.default = "http://user:password@proxy:port/";
  # networking.proxy.noProxy = "127.0.0.1,localhost,internal.domain";

  # Enable networking
  networking.networkmanager. enable = true;
  networking. useDHCP = lib.mkDefault true;
  # Serial console for Proxmox
  boot.kernelParams = ["console=tty0" "console=ttyS0,115200"];
  # Enable QEMU Guest for Proxmox integration
  services.qemuGuest.enable = true;
  services.spice-vdagentd.enable = true;

  # Enable SSH
  services.openssh = {
    enable = true;
    ports = [22];
    settings = {
      PasswordAuthentication = false;
      AllowUsers = null;
      UseDns = true;
      PermitRootLogin = "no";
    };
  };

  # Set your time zone.
  time. timeZone = "Europe/Copenhagen";

  # Select internationalisation properties.
  i18n.defaultLocale = "en_GB.UTF-8";

  i18n.extraLocaleSettings = {
    LC_ADDRESS = "et_EE.UTF-8";
    LC_IDENTIFICATION = "et_EE.UTF-8";
    LC_MEASUREMENT = "et_EE.UTF-8";
    LC_MONETARY = "et_EE.UTF-8";
    LC_NAME = "et_EE.UTF-8";
    LC_NUMERIC = "et_EE.UTF-8";
    LC_PAPER = "et_EE.UTF-8";
    LC_TELEPHONE = "et_EE.UTF-8";
    LC_TIME = "et_EE.UTF-8";
  };

  # Configure keymap in X11
  services.xserver. xkb = {
    layout = "us";
    variant = "";
  };

  # Enable Seatd for Wayland sessions
  # IMPORTANT: Enable seatd service for River WM
  services.seatd = {
    enable = true;
    logLevel = "info";
  };

  # Enable the gnome-keyring secrets vault.
  # Will be exposed through DBus to programs willing to store secrets.
  services. gnome.gnome-keyring.enable = true;

  # Enable Sway window manager
  programs.sway = {
    enable = true;
    wrapperFeatures.gtk = true;
  };

  services.greetd = {
    enable = true;
    settings = {
      default_session = {
        command = "${pkgs.tuigreet}/bin/tuigreet --time --cmd sway";
        user = "greeter";
      };
    };
  };

  # Configure security to allow seatd access
  security.polkit.enable = true;

  # Configure GPU support
  hardware.graphics = {
    enable = true;
    enable32Bit = true;
  };

  # Define a user account. Don't forget to set a password with 'passwd'.
  # Copy this later to generate more custom users.
  users.users.piholeprg = {
    isNormalUser = true;
    description = "NixOS Playground";
    extraGroups = ["networkmanager" "wheel" "seat"];
    packages = with pkgs; [];
    initialPassword = "nixos"; # Simple, change on first login
  };

  home-manager.users.piholeprg = {pkgs, ...}: {
    home.packages = [
      pkgs.atool
      pkgs.httpie
      pkgs.alacritty # Terminal emulator
      pkgs. hyfetch # Add fetching packages
      pkgs.macchina
      pkgs.wayland # Wayland display server
      pkgs.wlroots # Wayland compositor library
      pkgs.maple-mono. NF # Font for better terminal appearance
      pkgs.wl-clipboard # Clipboard utilities for Wayland
      pkgs.mako # Wayland Sway Notification Daemon
      pkgs.btop # Resource monitor
    ];

    # Configure LibreWolf browser
    programs.librewolf = {
      enable = true;
      # Enable WebGL, cookies and history
      settings = {
        "webgl.disabled" = false;
        "privacy.resistFingerprinting" = true;
        "privacy.clearOnShutdown. history" = false;
        "privacy.clearOnShutdown.cookies" = true;
      };
    };

    # Set Alacritty as the default terminal emulator
    home.sessionVariables = {
      TERMINAL = "alacritty";
    };

    # Use Zsh as the default shell
    programs.zsh. enable = true;

    # Configure Alacritty as the default terminal emulator
    programs.alacritty = {
      enable = true;
      settings = {
        # Window configuration
        window = {
          opacity = 1.0;
          padding = {
            x = 10;
            y = 10;
          };
        };

        # Font configuration - fixes spacing issues
        font = {
          normal = {
            family = "Maple Mono NF";
            style = "Regular";
          };
          bold = {
            family = "Maple Mono NF";
            style = "Bold";
          };
          italic = {
            family = "Maple Mono NF";
            style = "Italic";
          };
          bold_italic = {
            family = "Maple Mono NF";
            style = "Bold Italic";
          };
          size = 14.0;
        };

        # Colors (optional - using default Alacritty colors)
        colors = {
          primary = {
            background = "#1e1e2e";
            foreground = "#cdd6f4";
          };
        };
      };
    };

    # Configure Hyfetch system info fetcher
    programs.hyfetch = {
      enable = true;
      settings = {
        preset = "lesbian"; # Use lesbian flag preset
        mode = "rgb"; # Use RGB color mode
        lightness = 0.55; # Set to 55% brightness
        backend = "macchina"; # Use macchina as the backend
        logo_size = "small"; # Make small logo
        pride_month_disable = false; # Enable pride month mode (or true to disable)
        pride_month_shown = []; # List of shown pride month flags
        color_align = {
          mode = "horizontal";
        };
      };
    };

    # The state version is required and should stay at the version you
    # originally installed.
    home.stateVersion = "25.11";
  };

  # Allow unfree packages
  nixpkgs.config.allowUnfree = true;

  # Passwordless sudo for wheel group
  security.sudo. wheelNeedsPassword = false;

  # Hardware U2F support - Passwordless sudo with hardware key
  security.pam.u2f = {
    enable = true;
    settings = {
      authfile = "/etc/u2f_keys";
      cue = true;
      pinverification = 0; # No PIN verification
      userpresence = 1; # Require user presence (touch)
    };
  };

  # SSH Agent authentication
  security.pam.sshAgentAuth. enable = true;

  # Automatic upgrades
  system.autoUpgrade = {
    enable = true; # Set to true for automatic updates
    dates = "daily";
    allowReboot = false;
  };

  # System packages
  environment.systemPackages = with pkgs; [
    # Network tools
    wget
    curl
    dig
    tcpdump
    ethtool
    iptables
    nftables
    iproute2
    bridge-utils
    netcat-gnu
    traceroute
    mtr

    # Add the ability to create NixOS images
    nixos-generators

    # Monitoring
    btop
    htop
    iotop
    bandwhich

    # Editors
    micro
    vim
    helix

    # System info
    fastfetch
    lshw
    pciutils
    usbutils

    # Filesystem utilities
    btrfs-progs
    e2fsprogs
    ntfs3g
    dosfstools
    os-prober

    # Development tools
    knot-dns

    # Browser for web interface access
    librewolf
  ];

  # Enable zram swap
  zramSwap = {
    enable = true;
    memoryPercent = 50;
  };

  # 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;
  # };

  networking = {
    hosts = {
      "10.1.1.1" = ["ipfire.server.prg" "ipfire"];
      "10.1.1.2" = ["pi-hole.server.prg" "pi-hole"];
      # "10.1.1.15" = ["nas.server.prg" "nas"];
    };
  };

  #
  # Services
  #
  services = {
    # I'm not actually using the dnsmasq service.  Pi-hole provides
    # it's own dnsmasq. I'm using Nix' ability to manage the
    # dnsmasq-style configuration file that Pi-hole utilizes.
    dnsmasq = {
      enable = false;
      settings = {
        address = [
          #"/feelinsonice-hrd.appspot.com/ # Block Snapchat"
          #"/feelinsonice. appspot.com/ # Block Snapchat"
          #"/snapchat.com/ # Block Snapchat"
        ];
        dhcp-name-match = [
          #"set: hostname-ignore,wpad"
          #"set:hostname-ignore,localhost"
        ];
        # Set DHCP option 6 to the DNS server you nodes should use.
        dhcp-option = [
          "vendor: MSFT,2,1i"
          "6,10.1.1.2"
        ];
        domain = [
          "server.prg,192.168.33.0/24,local"
        ];
      };
    };

    pihole-ftl = {
      enable = true;
      lists = [
        {
          url = "https://raw.githubusercontent.com/StevenBlack/hosts/master/alternates/fakenews-gambling-porn/hosts";
          type = "block";
          enabled = true;
          description = "Steven Black's HOSTS - Usual, porn, gambling, fakenews etc. block";
        }
      ];
      openFirewallDNS = true;
      openFirewallDHCP = true;
      openFirewallWebserver = true;
      queryLogDeleter.enable = true;
      settings = {
        # See https://docs.pi-hole.net/ftldns/configfile/
        dhcp = {
          active = true; # <-- SET TO TRUE ONLY WHEN YOU'RE READY!
          end = "10.1.1.254";
          hosts = [
            # Add new statics here
          ];
          ipv6 = true;
          leaseTime = "24h";
          multiDNS = true; # This ensures that DNS is there, because some people's computers might yeet the given DNS server still
          start = "10.1.1.122";
          rapidCommit = true;
          resolver = {
            resolveIPv6 = false;
          };
          router = "10.1.1.1";
        };

        ### COMMENT THIS AFTER INSTALLATION!
        misc. readOnly = false;
        dns = {
          cnameRecords = [
            #"color-printer,office-printer"
            #"color-printer. homelab. me,office-printer.homelab.me"
          ];
          domain = "server.prg";
          domainNeeded = true;
          expandHosts = true;
          interface = "ens18";
          hosts = [
            "10.1.1.1   ipfire"
            "10.1.1.2   pi-hole"
            #"10.1.1.15  nas"
          ];
          upstreams = ["127.0.0.1#5335"]; # Pointing to Unbound
        };
        ntp = {
          ipv4.active = true;
          ipv6.active = true;
          sync.active = true;
        };
        webserver = {
          api = {
            # To manage the web login:
            # 1) Temporarily set misc.readOnly to false in
            #    configuration.nix and switch to it.
            # 2) Manually set a password:
            #    Pi-hole web console > Settings > All settings >
            #    Webserver and API > webserver. api.password > Value:  ******
            # 3) Read the generated hash:
            #    sudo pihole-FTL --config webserver.api.pwhash
          };
          session = {
            timeout = 43200; # 12h
          };
        };
      };
      useDnsmasqConfig = true;
    };

    pihole-web = {
      enable = true;
      ports = [80];
    };

    resolved = {
      extraConfig = ''
        DNSStubListener=no
        MulticastDNS=off
      '';
    };

    # Unbound recursive DNS server configuration
    # Based on Pi-hole + Unbound guide:  https://docs.pi-hole.net/guides/dns/unbound/
    unbound = {
      enable = true;
      package = pkgs.unbound-with-systemd;

      settings = {
        server = {
          # Listen only on localhost for Pi-hole queries
          interface = ["127.0.0.1"];
          port = 5335;

          # Access control - only allow localhost
          access-control = [
            "127.0.0.0/8 allow"
            "0.0.0.0/0 refuse"
          ];

          # Enable both IPv4 and IPv6
          do-ip4 = true;
          do-ip6 = true;
          do-udp = true;
          do-tcp = true;

          # Prefer IPv4 (recommended for most setups)
          prefer-ip6 = false;

          # Security enhancements
          harden-glue = true;
          harden-dnssec-stripped = true;
          use-caps-for-id = false; # Prevents DNSSEC issues

          # Performance optimizations from Pi-hole guide
          edns-buffer-size = 1232; # Prevents UDP fragmentation
          prefetch = true; # Prefetch expiring cache entries

          # Threading (1 thread sufficient for most home setups)
          num-threads = 1;

          # Increase socket buffer for high query rates
          so-rcvbuf = "1m";

          # Privacy - ensure no queries leak to public IPs
          private-address = [
            "192.168.0.0/16"
            "169.254.0.0/16"
            "172.16.0.0/12"
            "10.0.0.0/8"
            "fd00::/8"
            "fe80::/10"
            # RFC6303 addresses
            "192.0.2.0/24"
            "198.51.100.0/24"
            "203.0.113.0/24"
            "255.255.255.255/32"
            "2001:db8::/32"
          ];

          # Logging configuration (set to 0 for production, higher for debugging)
          verbosity = 0;
          log-queries = false;

          # Additional security
          hide-identity = true;
          hide-version = true;

          # Cache settings
          cache-min-ttl = 0;
          cache-max-ttl = 86400;

          # Hardening options
          harden-below-nxdomain = true;
          harden-referral-path = false;
          harden-algo-downgrade = false;
        };

        # Optional: Forward to encrypted DNS (comment out for pure recursive)
        # Uncomment below to use Quad9 with DNS-over-TLS
        # forward-zone = [
        #   {
        #     name = ". ";
        #     forward-addr = [
        #       "9.9.9.9@853#dns.quad9.net"
        #       "149.112.112.112@853#dns.quad9.net"
        #     ];
        #     forward-tls-upstream = true;
        #   }
        # ];
      };
    };
  };

  # Systemd configuration for Unbound and Pi-hole integration
  systemd = {
    # Create necessary directories and files
    tmpfiles.rules = [
      # Silence benign FTL. log warning
      "f /etc/pihole/versions 0644 pihole pihole - -"

      # Unbound directories (if needed for custom configs)
      "d /var/lib/unbound 0755 unbound unbound - -"
    ];

    services = {
      # Ensure Unbound starts before Pi-hole FTL
      pihole-ftl = {
        after = ["unbound.service"];
        wants = ["unbound.service"];
      };

      # Automatic root hints updater (runs monthly)
      unbound-root-hints-updater = {
        description = "Update Unbound Root Hints";
        serviceConfig = {
          Type = "oneshot";
          ExecStart = "${pkgs.writeShellScript "update-root-hints" ''
            #!/usr/bin/env bash
            set -euo pipefail

            HINTS_FILE="/var/lib/unbound/root. hints"
            TEMP_FILE=$(mktemp)

            echo "Downloading latest root hints..."
            ${pkgs.curl}/bin/curl -sf https://www.internic.net/domain/named.root -o "$TEMP_FILE"

            if [ -s "$TEMP_FILE" ]; then
              mv "$TEMP_FILE" "$HINTS_FILE"
              chown unbound:unbound "$HINTS_FILE"
              chmod 644 "$HINTS_FILE"
              echo "Root hints updated successfully"
              systemctl restart unbound. service
            else
              echo "Failed to download root hints"
              rm -f "$TEMP_FILE"
              exit 1
            fi
          ''}";
        };
      };
    };

    timers = {
      # Run root hints update monthly
      unbound-root-hints-updater = {
        description = "Monthly Unbound Root Hints Update";
        wantedBy = ["timers.target"];
        timerConfig = {
          OnCalendar = "monthly";
          Persistent = true;
          RandomizedDelaySec = "1h";
        };
      };
    };
  };

  # System activation scripts
  system.activationScripts = {
    print-pi-hole = {
      text = builtins.trace "Building the pi-hole configuration..." "";
    };

    # Initialize unbound root hints on first boot
    unbound-root-hints = {
      text = ''
        if [ ! -f /var/lib/unbound/root.hints ]; then
          echo "Initializing Unbound root hints..."
          ${pkgs.curl}/bin/curl -sf https://www.internic.net/domain/named.root \
            -o /var/lib/unbound/root.hints || true
          if [ -f /var/lib/unbound/root.hints ]; then
            chown unbound:unbound /var/lib/unbound/root. hints
            chmod 644 /var/lib/unbound/root.hints
          fi
        fi
      '';
    };

    # Fix socket buffer size warning
    unbound-socket-buffer = {
      text = ''
        # Set kernel parameter for unbound socket buffer
        if [ "$(sysctl -n net. core.rmem_max)" -lt 1048576 ]; then
          echo "Setting net.core.rmem_max=1048576 for Unbound"
          sysctl -w net.core.rmem_max=1048576 || true
        fi
      '';
    };
  };

  # Make socket buffer size permanent
  boot.kernel.sysctl = {
    "net.core.rmem_max" = 1048576; # 1MB for Unbound
  };

  # Attach the system to the IPFire network:  set a static IP on the Proxmox bridge (ens18)
  # Adjust `ens18` and the address below to your environment.
  networking.interfaces.ens18.ipv4.addresses = [
    {
      address = "10.1.1.2";
      prefixLength = 24;
    } # Using this IP for DNS server
  ];
  networking.defaultGateway = "10.1.1.1";

  # List services that you want to enable:

  # Enable the OpenSSH daemon.
  # services.openssh.enable = true;

  # Open ports in the firewall.
  # networking.firewall.allowedTCPPorts = [ ...  ];
  # networking.firewall.allowedUDPPorts = [ ... ];
  # Or disable the firewall altogether.
  # networking.firewall.enable = false;

  # 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-knot. nix or on https://nixos.org/nixos/options.html).
  system.stateVersion = "25.11"; # Did you read the comment?
}