{ config, lib, pkgs, ... }:
let
  nixpkgs = import <nixpkgs> {};
  kakCmd = "kak";

  rustPlugins = with pkgs; [
    cargo
    cargo-watch
    clippy
    rust-analyzer
  ];
  cppPlugins = with pkgs; [
    clang-tools
  ];
  latexPlugins = with pkgs; [
    texlab
  ];
  pythonPlugins = with pkgs.python38Packages; [
    pyls-black
    python-language-server
  ];
  nixPlugins = with pkgs; [
    rnix-lsp
  ];
  spellingPlugins = with pkgs; [
    aspell
    aspellDicts.en
    aspellDicts.en-computers
    aspellDicts.en-science
    aspellDicts.it
  ];
  dataFormats = with pkgs; [
    # yaml-language-server
  ];

in
{
  home.sessionVariables = {
    EDITOR = kakCmd;
    VISUAL = kakCmd;
  };
  programs.bash.shellAliases = { k = kakCmd; };
  programs.zsh.shellAliases = { k = kakCmd; };

  programs.kakoune = {
    enable = true;
    config = {
      colorScheme = "nord";
      tabStop = 2;
      indentWidth = 2;
      alignWithTabs = true;
      scrollOff = {
        lines = 5;
        columns = 3;
      };
      ui = {
        setTitle = true;
        changeColors = true;
        enableMouse = true;
      };
      wrapLines = {
        enable = true;
        word = true;
      };
      numberLines = {
        enable = true;
        highlightCursor = true;
      };
      keyMappings = [
        { mode = "normal"; docstring = "Open file"; key = "<c-o>"; effect = ":edit<space>"; }
        { mode = "user"; docstring = "Code actions"; key = "a"; effect = ":lsp-code-actions<ret>"; }
        { mode = "user"; docstring = "Comment block"; key = "b"; effect = ":comment-block<ret>"; }
        { mode = "user"; docstring = "Comment line"; key = "l"; effect = ":comment-line<ret>"; }
        { mode = "user"; docstring = "Copy to clipboard"; key = "y"; effect = "<a-|>${pkgs.xclip}/bin/xclip -i -selection clipboard<ret>"; }
        { mode = "user"; docstring = "Format code"; key = "F"; effect = ":lsp-formatting-sync<ret>"; }
        { mode = "user"; docstring = "Jump to definition"; key = "d"; effect = ":lsp-definition<ret>"; }
        { mode = "user"; docstring = "Jump to type definition"; key = "t"; effect = ":lsp-type-definition<ret>"; }
        { mode = "user"; docstring = "List project diagnostics"; key = "i"; effect = ":lsp-diagnostics<ret>"; }
        { mode = "user"; docstring = "Paste from clipboard (after)"; key = "P"; effect = "<a-!>${pkgs.xclip}/bin/xclip -selection clipboard -o<ret>"; }
        { mode = "user"; docstring = "Paste from clipboard (before)"; key = "p"; effect = "!${pkgs.xclip}/bin/xclip -selection clipboard -o<ret>"; }
        { mode = "user"; docstring = "Show hover info"; key = "q"; effect = ":lsp-hover<ret>"; }
        { mode = "user"; docstring = "Spellcheck English"; key = "S"; effect = ":spell en<ret>"; }
        { mode = "user"; docstring = "Spellcheck"; key = "s"; effect = ":spell "; }
        { mode = "normal"; docstring = "Try next snippet placeholder"; key = "<c-n>"; effect = "<a-;>: insert-c-n<ret>"; }
      ];
      hooks = [
        { name = "BufCreate"; option = ".*"; commands = "editorconfig-load"; }
        { name = "ModuleLoaded"; option = "auto-pairs"; commands = "auto-pairs-enable"; }
        { name = "ModuleLoaded"; option = "powerline"; commands = builtins.concatStringsSep "\n" [ "powerline-enable" ]; }
        { name = "WinSetOption"; option = "filetype=(rust|python|c|cpp|latex|javascript|go|nix)"; commands = builtins.concatStringsSep "\n" [ "lsp-enable-window" ]; }
      ];
    };
    extraConfig = builtins.concatStringsSep "\n" [
      "# Custom commands"
      "define-command -docstring 'save and quit' x 'write-all; quit' # Save and quit with 'x'"
      "add-highlighter global/ regex \\h+$ 0:Error                   # Highlight trailing spaces"
      "eval %sh{kak-lsp --kakoune -s \$kak_session}                  # Start kak-lsp"

      # Kak-lsp snippet support
      ''
        def -hidden insert-c-n %{
         try %{
           lsp-snippets-select-next-placeholders
           exec '<a-;>d'
         } catch %{
           exec -with-hooks '<c-n>'
         }
        }
      ''

      "require-module prelude"
      "# require-module auto-pairs"
      "require-module connect"
      "require-module connect-broot"
      "require-module connect-lf"
      "require-module connect-rofi"
      "require-module powerline"
    ];
    plugins = (
      with pkgs; [
        broot
        lf
        editorconfig-core-c
        kakounePlugins.auto-pairs-kak
        kakounePlugins.kak-lsp
        kakounePlugins.powerline-kak
        kakounePlugins.prelude-kak
      ]
    ) ++ (
      with nixpkgs; [
        kakounePlugins.connect-kak
      ]
    ) ++ rustPlugins ++ cppPlugins ++ pythonPlugins ++ latexPlugins ++ nixPlugins ++ spellingPlugins ++ dataFormats;
  };
  xdg.configFile."kak/colors/nord.kak".source = ../configs/kak/colors/nord.kak;
  xdg.configFile."kak-lsp/kak-lsp.toml".source = ../configs/kak-lsp/kak-lsp.toml;
}