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

with lib;

let
  # "7.4.335" -> "74"
  majmin = x: concatStrings (take 2 (splitString "." x));
in

{
  imports = [
    {
      users.extraUsers =
        mapAttrs (_: h: { hashedPassword = h; })
                 (import /root/src/secrets/hashedPasswords.nix);
    }
    {
      users.defaultUserShell = "/run/current-system/sw/bin/bash";
      users.mutableUsers = false;
    }
    {
      users.extraUsers = {
        root = {
          openssh.authorizedKeys.keys = map readFile [
            ../../Zpubkeys/tv_wu.ssh.pub
          ];
        };
        tv = {
          uid = 1337;
          group = "users";
          home = "/home/tv";
          createHome = true;
          useDefaultShell = true;
          extraGroups = [
            "audio"
            "video"
            "wheel"
          ];
          openssh.authorizedKeys.keys = map readFile [
            ../../Zpubkeys/tv_wu.ssh.pub
          ];
        };
      };
    }
    {
      security.sudo.extraConfig = ''
        Defaults mailto="tv@wu.retiolum"
      '';
      time.timeZone = "Europe/Berlin";
    }
    {
      # TODO check if both are required:
      nix.chrootDirs = [ "/etc/protocols" pkgs.iana_etc.outPath ];

      nix.trustedBinaryCaches = [
        "https://cache.nixos.org"
        "http://cache.nixos.org"
        "http://hydra.nixos.org"
      ];

      nix.useChroot = true;
    }

    {
      environment.systemPackages = with pkgs; [
        vim
      ];

      environment.etc."vim/vimrc".text = ''
        set nocp
      '';

      environment.etc."vim/vim${majmin pkgs.vim.version}".source =
          "${pkgs.vim}/share/vim/vim${majmin pkgs.vim.version}";

      # multiple-definition-problem when defining environment.variables.EDITOR
      environment.extraInit = ''
        EDITOR=vim
      '';

      environment.shellAliases = {
        # alias cal='cal -m3'
        gp = "${pkgs.pari}/bin/gp -q";
        df = "df -h";
        du = "du -h";
        # alias grep='grep --color=auto'

        # TODO alias cannot contain #\'
        # "ps?" = "ps ax | head -n 1;ps ax | fgrep -v ' grep --color=auto ' | grep";

        # alias la='ls -lA'
        lAtr = "ls -lAtr";
        # alias ll='ls -l'
        ls = "ls -h --color=auto --group-directories-first";
        # alias vim='vim -p'
        # alias vi='vim'
        # alias view='vim -R'
        dmesg = "dmesg -L --reltime";
      };

      environment.variables.VIM = "/etc/vim";

      programs.bash = {
        interactiveShellInit = ''
          HISTCONTROL='erasedups:ignorespace'
          HISTSIZE=65536
          HISTFILESIZE=$HISTSIZE

          shopt -s checkhash
          shopt -s histappend histreedit histverify
          shopt -s no_empty_cmd_completion
          complete -d cd

          # TODO source bridge
        '';
        promptInit = ''
          case $UID in
            0)
              PS1='\[\e[1;31m\]\w\[\e[0m\] '
              ;;
            1337)
              PS1='\[\e[1;32m\]\w\[\e[0m\] '
              ;;
            *)
              PS1='\[\e[1;35m\]\u \[\e[1;32m\]\w\[\e[0m\] '
              ;;
          esac
          if test -n "$SSH_CLIENT"; then
            PS1='\[\e[35m\]\h'" $PS1"
          fi
          if test -n "$SSH_AGENT_PID"; then
            PS1="ssh-agent[$SSH_AGENT_PID] $PS1"
          fi
        '';
      };

      programs.ssh.startAgent = false;
    }

    {
      nixpkgs.config.packageOverrides = pkgs:
        {
          nano = pkgs.runCommand "empty" {} "mkdir -p $out";
        };

      services.cron.enable = false;
      services.nscd.enable = false;
      services.ntp.enable = false;
    }

    {
      boot.kernel.sysctl = {
        # Enable IPv6 Privacy Extensions
        "net.ipv6.conf.all.use_tempaddr" = 2;
        "net.ipv6.conf.default.use_tempaddr" = 2;
      };
    }

    {
      services.openssh = {
        enable = true;
        hostKeys = [
          { type = "ed25519"; path = "/etc/ssh/ssh_host_ed25519_key"; }
        ];
      };
    }

    {
      # TODO: exim
      security.setuidPrograms = [
        "sendmail"  # for sudo
      ];
    }
  ];
}