-- luasnip setup
local luasnip = require "luasnip"

local cmp = require "cmp"

cmp.setup {
  completion = {
    completeopt = "menu,menuone,noselect"
  },
	preselect = "none",
  snippet = {
    expand = function(args)
      require("luasnip").lsp_expand(args.body)
    end
  },
  mapping = {
    ["<C-Space>"] = cmp.mapping.complete(),
    ["<C-e>"] = cmp.mapping.close(),
    ["<CR>"] = cmp.mapping.confirm {
      behavior = cmp.ConfirmBehavior.Replace,
      select = true
    },
    ["<Tab>"] = function(fallback)
      if vim.fn.pumvisible() == 1 then
        vim.fn.feedkeys(vim.api.nvim_replace_termcodes("<C-n>", true, true, true), "n")
      elseif luasnip.expand_or_jumpable() then
        vim.fn.feedkeys(vim.api.nvim_replace_termcodes("<Plug>luasnip-expand-or-jump", true, true, true), "")
      else
        fallback()
      end
    end,
    ["<S-Tab>"] = function(fallback)
      if vim.fn.pumvisible() == 1 then
        vim.fn.feedkeys(vim.api.nvim_replace_termcodes("<C-p>", true, true, true), "n")
      elseif luasnip.jumpable(-1) then
        vim.fn.feedkeys(vim.api.nvim_replace_termcodes("<Plug>luasnip-jump-prev", true, true, true), "")
      else
        fallback()
      end
    end
  },
  sources = {
    {name = "nvim_lsp"},
    {name = "luasnip"}
  }
}

-- The nvim-cmp almost supports LSP's capabilities so You should advertise it to LSP servers..
local capabilities = vim.lsp.protocol.make_client_capabilities()
capabilities = require("cmp_nvim_lsp").update_capabilities(capabilities)