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

with lib;

mkIf (elem "emacs::lsp" config.machine.pkgs) {
  programs.emacs.init.usePackage = {
    lsp-mode = {
      enable = true;
      command = [ "lsp-mode" ];
      config = ''
        (setq lsp-keymap-prefix "C-c")
        (setq lsp-eldoc-render-all nil)

        (defvar lsp-language-id-configuration '(
          ${optionalString (elem "emacs::rust" config.machine.pkgs)
            ''(rust-mode . "rust")''}
        ))
        ${optionalString (elem "emacs::rust" config.machine.pkgs) ''
          (setq lsp-rust-clippy-preference "on")
        ''}
        ${optionalString (elem "emacs::web-mode" config.machine.pkgs) ''
          (setq lsp-clients-deno-enable-unstable 't)
          (setq lsp-clients-deno-import-map "./import_map.json")
          (setq lsp-clients-deno-config "./deno.json")
        ''}
      '';
    };

    lsp-ui = {
      enable = true;
      after = [ "lsp-mode" ];
      config = ''
        (setq lsp-ui-sideline-enable 't)
        (setq lsp-ui-sideline-show-symbol nil)
        (setq lsp-ui-sideline-show-hover nil)
        (setq lsp-ui-doc-show-with-cursor 't)
        (setq lsp-ui-doc-delay 1)
        (setq lsp-ui-sideline-show-code-actions 't)
        (setq lsp-ui-sideline-update-mode 'point)
        (define-key lsp-ui-mode-map [remap xref-find-definitions] #'lsp-ui-peek-find-definitions)
        (define-key lsp-ui-mode-map [remap xref-find-references] #'lsp-ui-peek-find-references)
      '';
    };

    lsp-ui-flycheck = {
      enable = true;
      package = epkgs: [ epkgs.lsp-ui ];
      after = [ "lsp-ui" ]
              ++ optional (elem "emacs::flycheck" config.machine.pkgs) "flycheck";
    };
  };
}