local M = { "hrsh7th/nvim-cmp" }

M.name = "cmp"
M.dependencies = {
  "saadparwaiz1/cmp_luasnip",
  "hrsh7th/cmp-nvim-lsp",
}

function M.config()
  local cmp = require "cmp"
  local luasnip = require "luasnip"

  local function expand(args)
    luasnip.lsp_expand(args.body)
  end

  local function tab_mapping(fallback)
    if cmp.visible() then
      cmp.select_next_item()
    elseif luasnip.expand_or_locally_jumpable() then
      luasnip.expand_or_jump()
    else
      fallback()
    end
  end

  local function back_tab_mapping(fallback)
    if cmp.visible() then
      cmp.select_prev_item()
    elseif luasnip.locally_jumpable(-1) then
      luasnip.jump(-1)
    else
      fallback()
    end
  end

  cmp.setup {
    enabled = true,

    snippet = { expand = expand },
    sources = {
      { name = "nvim_lsp" },
      { name = "luasnip" },
    },

    mapping = cmp.mapping.preset.insert {
      ["<C-n>"] = cmp.mapping.select_next_item(),
      ["<C-p>"] = cmp.mapping.select_prev_item(),
      ["<C-d>"] = cmp.mapping.scroll_docs(-4),
      ["<C-f>"] = cmp.mapping.scroll_docs(4),
      ["<C-Space>"] = cmp.mapping.complete({}),
      ["<Tab>"] = cmp.mapping(tab_mapping, { "i", "s" }),
      ["<S-Tab>"] = cmp.mapping(back_tab_mapping, { "i", "s" }),
      ["<CR>"] = cmp.mapping.confirm {
        behavior = cmp.ConfirmBehavior.Replace,
        select = true,
      },
    },
  }
end

return M