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

with lib;

let
  scripts = with pkgs.weechatScripts;
    [ colorize_nicks weechat-go weechat-matrix zncplayback ];

  networks = [
    "blitzed" "gnome" "hackint" "indymedia" "ircnet" "libera"
    "oftc" "pissnet" "tilde"
  ];

  matrixServers = { fairydust = "fairydust.space"; };

  toWeeChat = value:
    /**/ if value == true  then "on"
    else if value == false then "off"
    else if isList value   then concatStringsSep "," value
    else toString value;

  sec = [ "znc.username" "znc.password" ];

  ignores = [
    "osmbot-test oftc #osm-gb"
  ];

  cfgin = {
    alias.cmd.B = "buffer";
    alias.cmd.ZNC = "quote znc";
    irc.look.buffer_switch_autojoin = false;
    irc.look.color_nicks_in_nicklist = true;
    irc.look.display_join_message = false;
    irc.look.server_buffer = "independent";
    irc.look.temporary_servers = true;

    irc.server_default = {
      addresses = "znc.qyliss.net/6697";
      autoconnect = true;
      capabilities = [ "account-notify" "away-notify" "cap-notify" "multi-prefix" "server-time" "znc.in/server-time-iso" "znc.in/self-message" "znc.in/playback" ];
      nicks = "qyliss";
      password = "\\\${sec.data.znc.password}";
      ssl = true;
      username = "\\\${sec.data.znc.username}";
    };

    irc.server = genAttrs networks (s:
      { username = "'\\\${sec.data.znc.username}/${s}'"; });
    plugins.var.python.zncplayback.servers = networks;

    logger.color.backlog_end = "*default";
    logger.look.backlog = 200;

    matrix.look.human_buffer_names = true;
    matrix.server = flip mapAttrs matrixServers (name: _: {
      autoconnect = true;
      device_name = "WeeChat (${config.networking.hostName})";
      username = "qyliss";
      password = "\\\${sec.data.fairydust.password}";
    });

    script.look.sort = "p,n";

    weechat.bar.buflist.hidden = true;
    weechat.bar.fset.items = "fset";
    weechat.bar.input.items = "[mode_indicator]+ [input_prompt]+(away),[input_search],[input_paste],input_text";
    weechat.bar.nicklist.size_max = 12;
    weechat.bar.status.color_bg = 53;
    weechat.bar.status.items = "[otr],[buffer_plugin],buffer_name+(buffer_modes)+{buffer_nicklist_count}+buffer_zoom+buffer_filter,[matrix_typing_notice],scroll,[lag],[hotlist],completion";
    weechat.bar.title.color_bg = 53;

    weechat.color.chat_nick_colors = [ "cyan" "magenta" "green" "brown" "lightblue" "lightcyan" "lightmagenta" "lightgreen" "blue" ];
    weechat.color.chat_nick_self = "default";
    weechat.color.status_count_other = "white";
    weechat.color.status_data_other = "white";
    weechat.color.status_nicklist_count = "white";
    weechat.color.status_time = "white";

    weechat.completion.default_template = "%(nicks)|%(irc_channels)|%(emoji)";
    weechat.completion.nick_completer = ":";

    weechat.look.buffer_notify_default = "message";
    weechat.look.highlight = [
      "spectrum" "spectrumos" "pr-tracker" "crosvm"
      "qyliss" "alyssa*" "*dntmissher" "*@alyssa"
    ];
    weechat.look.hotlist_names_count = 10;
    weechat.look.hotlist_names_level = 14;
    weechat.look.mouse = true;
    weechat.look.prefix_align_max = 12;
    weechat.look.save_config_on_exit = false;
    weechat.look.window_title = "WeeChat \\\${info:version}";
  };

  commands =
    map (n: "/server add ${n} ${cfgin.irc.server_default.addresses}") networks ++
    [ "/matrix server delete matrix_org" ] ++
    mapAttrsToList (n: d: "/matrix server add ${n} ${d}") matrixServers ++
    map (i: "/ignore add ${i}") ignores ++
    mapAttrsToList (name: value: "/set ${name} ${toWeeChat value}")
                   (flattenAttrs cfgin);

  flattenAttrs' = sep: attrs:
    listToAttrs (concatLists (flip mapAttrsToList attrs (k: v:
      if isAttrs v then mapAttrsToList (k': nameValuePair "${k}${sep}${k'}") (flattenAttrs' sep v)
                 else [ (nameValuePair k v) ])));

  flattenAttrs = flattenAttrs' ".";

  # If we were to pass --run-command ourselves, it would get forwarded
  # to WeeChat before the /script loads, so scripts wouldn't be
  # available and we wouldn't be able to do stuff like set up Matrix.
  cfg = pkgs.runCommand "weechat-config" {} ''
    LC_ALL=C.UTF-8 ${pkgs.weechat.override {
      configure = { ... }: {
        inherit scripts;
        init = concatStringsSep ";" (commands ++ [ "/save" "/exit" ]);
      };
    }}/bin/weechat-headless -d $out
  '';

  weechatHome = "${config.users.users.qyliss.home}/state/weechat";

in

{
  environment.extraInit = ''
    export WEECHAT_HOME="$HOME/state/weechat"
  '';

  environment.systemPackages = with pkgs; [
    (weechat.override {
      configure = { ...}: {
        inherit scripts;
      };
    })

    weechatScripts.weechat-matrix # for helper scripts
  ];

  systemd.tmpfiles.packages = [ (pkgs.runCommand "weechat-tmpfiles" {} ''
    conf=$out/lib/tmpfiles.d/weechat.conf
    mkdir -p $(dirname $conf)
    echo "d ${weechatHome} 0700 qyliss qyliss" > $conf
    for file in ${cfg}/*.conf
    do
        if [ "$file" != ${cfg}/sec.conf ]
        then echo "L+ ${weechatHome}/$(basename "$file") - - - - $file" >> $conf
        fi
    done
  '') ];
}