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

{
  # Kernel configuration
  boot = {
    kernelPackages = pkgs.linuxPackages_latest;
    kernelParams = [ "zfs.zfs_arc_max=536870912" ];
    kernelModules = [ "i915" "acpi_call" "kvm-intel" ];
    extraModulePackages = with config.boot.kernelPackages; [ acpi_call ];
    supportedFilesystems = [ "zfs" ];
    zfs.requestEncryptionCredentials = true;
  };

  # Intel CPU tweaks
  hardware.cpu.intel.updateMicrocode =
    lib.mkDefault config.hardware.enableRedistributableFirmware;

  hardware.opengl.extraPackages = with pkgs; [
    vaapiIntel
    vaapiVdpau
    libvdpau-va-gl
  ];

  # Bootloader configuration
  boot.loader = {
    efi.canTouchEfiVariables = true;
    systemd-boot = {
      enable = true;
      configurationLimit = 50;
    };
  };

  # Run Nix garbage collector, while avoiding compiling
  nix = {
    gc = {
      automatic = true;
      options = "--delete-older-than 14d";
      dates = "14:30";
    };
    extraOptions = ''
      keep-outputs = true
      gc-keep-outputs = true
    '';
  };

  # Clean tmp directory on shutdown
  boot.cleanTmpDir = true;

  # Rotate logs after 7 days
  services.journald.extraConfig = "SystemMaxFiles=7";

  # Allow propietary software
  nixpkgs.config = {
    allowUnfree = true;
    pulseaudio = true;
  };

  # Scrub zpool monthly
  services.zfs.autoScrub = {
    enable = true;
    interval = "monthly";
  };

  # Set timezone and synchronize NTP
  time.timeZone = "Europe/Brussels";
  services.timesyncd.enable = true;

  # Enable the TLP daemon
  services.tlp = {
    enable = true;
    extraConfig = ''
      # Use the new CPU frequency scaling governor
      CPU_SCALING_GOVERNOR_ON_AC=schedutil
      CPU_SCALING_GOVERNOR_ON_BAT=schedutil

      # Adjust CPU frequencies accordingly to the power state
      CPU_SCALING_MIN_FREQ_ON_AC=800000
      CPU_SCALING_MAX_FREQ_ON_AC=3000000
      CPU_SCALING_MIN_FREQ_ON_BAT=800000
      CPU_SCALING_MAX_FREQ_ON_BAT=2300000

      # Enable audio power saving for Intel HDA, AC97 devices (timeout in secs).
      # A value of 0 disables, >=1 enables power saving (recommended: 1).
      # Default: 0 (AC), 1 (BAT)
      SOUND_POWER_SAVE_ON_AC=0
      SOUND_POWER_SAVE_ON_BAT=1

      # Runtime Power Management for PCI(e) bus devices: on=disable, auto=enable.
      # Default: on (AC), auto (BAT)
      RUNTIME_PM_ON_AC=on
      RUNTIME_PM_ON_BAT=auto

      # Battery feature drivers: 0=disable, 1=enable
      # Default: 1 (all)
      NATACPI_ENABLE=1
      TPACPI_ENABLE=1
      TPSMAPI_ENABLE=1
    '';
  };

  # NixOS version
  system.stateVersion = "20.09";

  # Create coolneng user
  users.users.coolneng = {
    isNormalUser = true;
    home = "/home/coolneng";
    extraGroups = [ "wheel" "video" "audio" "libvirtd" "lp" ];
    shell = pkgs.fish;
  };

  # Set shell and SSH for root user
  users.users.root = {
    shell = pkgs.fish;
    openssh.authorizedKeys.keys = [
      "ssh-rsa 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 coolneng@panacea"
    ];
  };

  # Auto-upgrade the system
  system.autoUpgrade = {
    enable = true;
    dates = "14:00";
  };

  # Suspend to RAM/disk when battery is critical
  services.upower = {
    enable = true;
    percentageAction = 5;
    criticalPowerAction = "HybridSleep";
  };

  # Import other configuration modules
  imports = [
    ./modules/software.nix
    ./modules/networking.nix
    ./modules/gui.nix
    ./modules/datasync.nix
    ./modules/audio.nix
    ./modules/development.nix
    ./modules/printing.nix
    ./modules/hardware-configuration.nix
  ];

}