-- return a function for lazy.nvim
return function()
  local cmp = require("cmp")
  local luasnip = require("luasnip")
  local lspkind = require("lspkind")

  -- load friendly-snippets
  require("luasnip.loaders.from_vscode").lazy_load()

  cmp.setup({
    snippet = {
      expand = function(args)
        luasnip.lsp_expand(args.body)
      end,
    },
    mapping = cmp.mapping.preset.insert({
      ["<C-b>"] = cmp.mapping.scroll_docs(-4),
      ["<C-f>"] = cmp.mapping.scroll_docs(4),
      ["<CR>"] = cmp.mapping.confirm({ select = true }),
      ["<Tab>"] = cmp.mapping(function(fallback)
        if cmp.visible() then
          cmp.select_next_item()
        elseif luasnip.expand_or_jumpable() then
          luasnip.expand_or_jump()
        else
          cmp.complete()
        end
      end, { "i", "s" }),
      ["<S-Tab>"] = cmp.mapping(function(fallback)
        if cmp.visible() then
          cmp.select_prev_item()
        elseif luasnip.jumpable(-1) then
          luasnip.jump(-1)
        else
          fallback()
        end
      end, { "i", "s" }),
    }),
    sources = cmp.config.sources({
      { name = "nvim_lsp" },
      { name = "path" },
      { name = "luasnip" },
    }, {
      { name = "buffer" },
    }),
    formatting = {
      format = lspkind.cmp_format({ with_text = true, maxwidth = 50 }),
    },
    window = {
      completion = cmp.config.window.bordered(),
      documentation = cmp.config.window.bordered(),
    },
    completion = {
      autocomplete = false,  -- only trigger with <Tab>
    },
  })
end