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

with lib;
let
  nom-system = pkgs.writeFishApplication {
    name = "nom-system";
    runtimeInputs = with pkgs; [ nix-output-monitor ];
    text = /* fish */ ''
      nom build --no-link "/home/moritz/.dotfiles#nixosConfigurations.$(hostname).config.system.build.toplevel" $argv
    '';
  };
  nom-system-command = name: command: pkgs.writeFishApplication {
    inherit name;
    runtimeInputs = with pkgs; [ nom-system nix ];
    text = /* fish */ ''
      nom-system $argv && ${command}
    '';
  };

  f = pkgs.writeFishApplication {
    name = "f";
    runtimeInputs = with pkgs; [ fzf bat ];
    text = /* fish */ ''
      fzf --query "$argv" \
          --multi \
          --bind "enter:become($EDITOR {+})" \
          --preview "bat --color=always --style=header,grid --line-range :500 {+}"
    '';
  };

  which-nix = pkgs.writeFishApplication {
    name = "which-nix";
    runtimeInputs = with pkgs; [ which coreutils-full ];
    text = /* fish */ ''
      readlink -f (which $argv)
    '';
    completions = /* fish */ ''
      complete -c which-nix -fa '(__fish_complete_command)'
    '';
  };

  gi = pkgs.writeFishApplication
    {
      name = "gi";
      runtimeInputs = with pkgs; [ fzf gum curl ];
      text = /* fish */ ''
        set url https://www.gitignore.io/api

        if test (count $argv) -eq 0
          set choice ( curl -sL $url/list \
                     | string split "," \
                     | fzf -m \
                     | string join "," )
        else
          set choice (string join "," $argv[1..])
        end

        if gum confirm "Overwrite current .gitignore?"
          curl -sL $url/$choice > .gitignore
        else
          curl -sL $url/$choice >> .gitignore
        end
      '';
      completions = /* fish */ ''
        set args (curl -sL https://www.gitignore.io/api/list | string split ",")
        complete -c gi -fa "$args"
      '';
    };
in
{
  users.users.moritz = {
    isNormalUser = true;
    home = "/home/moritz";
    extraGroups = [ "wheel" "networkmanager" "video" ];
    initialPassword = "password"; # CHANGE ME PLEASE
    openssh.authorizedKeys.keys = [
      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIGoAqa2m7hIzZ2LS96Z+RCIlRvhBM/j7h27tMBCwMT+a" # Moritz
      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIDhtwHDGAZshiQWKkCcPWV9tC83b+bKBgjDcjP/N2CKO" # Laptop
      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIKl8gMhwSf1NsP5gp14xbbyjqQLZzcHLb/XKRMoHdXgI" # Desktop
      "ssh-rsa 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" # GPG
    ];
  };

  time.timeZone = "Europe/Berlin";

  my = {
    bin.enable = true;
    shell = {
      abbreviations = {
        us = "systemctl --user";
        rs = "sudo systemctl";
      };
      aliases = {
        ls = "exa -lh --icons --git";
        cat = "bat";
        rm = "rm -i";
        mv = "mv -i";
        cd = "__zoxide_z";

        nixos-update = "pushd ~/.dotfiles && nix flake update && popd";

        latexwatch = ''find -type f -name "*.tex" | entr -c latexmk -pdf -silent'';
      };
      variables = { EDITOR = "vim"; };
    };
    programs = {
      direnv.enable = true;
      fish.enable = true;
      git.enable = true;
      gpg.enable = true;
      nix = {
        gc.enable = true;
        optimise.enable = true;
      };
      tmux.enable = true;
      tmux.keybinds = {
        prefix = {
          "-" = "split-window -v";
          "|" = "split-window -h";
          "C-l" = "send-keys C-l";
          "R" = "source-file $XDG_CONFIG_HOME/tmux/tmux.conf \\; display-message 'Reloaded tmux.conf'";
        };
        copy-mode-vi = {
          "v" = "send -X begin-selection";
          "V" = "send -X select-line";
          "C-v" = "send -X rectangle-toggle";
        };
      };
    };
  };

  console.keyMap = "de";

  environment.systemPackages = with pkgs; [
    # archives
    ouch

    # file management
    trash-cli

    # monitoring
    htop
    bottom

    # nix
    (nom-system-command "nixos-boot" "sudo nixos-rebuild boot --flake ~/.dotfiles")
    (nom-system-command "nixos-switch" "sudo nixos-rebuild switch --flake ~/.dotfiles")
    (nom-system-command "nixos-test" "sudo nixos-rebuild test --flake ~/.dotfiles")
    manix
    nix-index
    nix-output-monitor
    nixpkgs-fmt
    statix
    which-nix

    # other
    bat
    cht-sh
    du-dust
    duf
    entr
    exa
    f
    gi
    gparted
    neofetch
    reptyr
    ripgrep
    up
    vim
    viu
    wget
  ];

  fonts.packages = with pkgs; [
    (nerdfonts.override {
      fonts = [ "FiraCode" ];
    })
  ];

  programs = {
    mtr.enable = true;
    command-not-found.enable = true;
    starship.enable = true;
  };

  services = {
    sshd.enable = true; # for agenix
    btrfs.autoScrub.enable =
      lib.mkDefault
        (builtins.any (filesystem: filesystem.fsType == "btrfs")
          (builtins.attrValues config.fileSystems));
  };

  i18n.extraLocaleSettings = {
    # LC_NUMERIC = "de_DE.UTF-8";
    LC_PAPER = "de_DE.UTF-8";
    LC_TIME = "de_DE.UTF-8";
  };

  home-manager.users.moritz = {
    programs = {
      # Let Home Manager install and manage itself.
      home-manager.enable = true;
      fzf = {
        enable = true;
        defaultOptions = [
          "--height 50%"
          "--bind alt-j:preview-down,alt-k:preview-up"
        ];
      };
      zoxide = {
        enable = true;
        options = [
          "--cmd c"
        ];
      };
    };
    home = {
      username = "moritz";
      homeDirectory = "/home/moritz";
      stateVersion = "21.05";
    };
    xdg.userDirs.enable = true;
  };

  system.activationScripts.diff = ''
    if [ -e /run/current-system ]; then
      ${pkgs.nvd}/bin/nvd --nix-bin-dir ${pkgs.nix}/bin diff /run/current-system/ "$systemConfig"
    fi
  '';
}