{ config, lib, ... }:

# Cmp - Completion plugin (nvim-cmp) for auto-completion
{
  config.programs.nixvim.plugins.cmp = lib.mkIf config.programs.nixvim.enable {
    enable = true;
    autoEnableSources = true;
    settings = {
      snippet.expand = "function(args) require('luasnip').lsp_expand(args.body) end";
      mapping = {
        "<C-Space>" = "cmp.mapping.complete()";
        "<CR>" = "cmp.mapping.confirm({ select = true })";
        "<Tab>" = "cmp.mapping.select_next_item()";
        "<S-Tab>" = "cmp.mapping.select_prev_item()";
        "<Down>" = "cmp.mapping.select_next_item()";
        "<Up>" = "cmp.mapping.select_prev_item()";
        "<C-u>" = "cmp.mapping.scroll_docs(-4)"; # scroll docs up
        "<C-d>" = "cmp.mapping.scroll_docs(4)"; # scroll docs down

        "<Escape>" = ''
          cmp.mapping(function(fallback)
            if cmp.visible() then
              cmp.abort()
            else
              fallback()
            end
          end, { "i" })
        '';
      };
      sources = [
        { name = "nvim_lsp"; }
        { name = "path"; }
        { name = "buffer"; }
      ];
    };
  };
}