local cmp = require("cmp")

cmp.setup({
  snippet = {
    expand = function(args)
      vim.fn["vsnip#anonymous"](args.body)
    end,
  },

  mapping = cmp.mapping.preset.insert({
    ["<C-p>"] = cmp.mapping.select_prev_item(),
    ["<C-n>"] = cmp.mapping.select_next_item(),

    ["<C-f>"] = cmp.mapping.scroll_docs(4),
    ["<C-b>"] = cmp.mapping.scroll_docs(-4),

    ["<C-Space>"] = cmp.mapping.complete(),
    ["<C-e>"] = cmp.mapping.abort(),

    ["<CR>"] = cmp.mapping.confirm({
      behavior = cmp.ConfirmBehavior.Insert,
      select = false,
    }),

    ["<Tab>"] = cmp.mapping(function(fallback)
      if cmp.visible() then
        cmp.select_next_item()
      elseif vim.fn == 1 then
        vim.fn.feedkeys(
          vim.api.nvim_replace_termcodes("<Plug>(vsnip-jump-next)", true, true, true),
          ""
        )
      else
        fallback()
      end
    end, { "i", "s" }),

    ["<S-Tab>"] = cmp.mapping(function(fallback)
      if cmp.visible() then
        cmp.select_prev_item()
      elseif vim.fn["vsnip#jumpable"](-1) == 1 then
        vim.fn.feedkeys(
          vim.api.nvim_replace_termcodes("<Plug>(vsnip-jump-prev)", true, true, true),
          ""
        )
      else
        fallback()
      end
    end, { "i", "s" }),
  }),

  sources = cmp.config.sources({
    { name = "nvim_lsp", keyword_length = 2 },
    { name = "path" },
    { name = "vsnip", keyword_length = 2 },
  }, {
    { name = "buffer", keyword_length = 5 },
  }),

  window = {
    completion = cmp.config.window.bordered(),
    documentation = cmp.config.window.bordered(),
  },

  formatting = {
    fields = { "abbr", "kind", "menu" },
    format = function(entry, item)
      local menu_icon = {
        nvim_lsp = "λ",
        vsnip = "⋗",
        buffer = "Ω",
        path = "•",
      }

      item.menu = menu_icon[entry.source.name] or entry.source.name
      return item
    end,
  },

  preselect = cmp.PreselectMode.None,

  completion = {
    completeopt = "menu,menuone,noinsert,noselect",
  },
})

vim.o.completeopt = "menu,menuone,noinsert,noselect"