local status, cmp = pcall(require, "cmp")
if (not status) then return end


local function has_words_before()
  local line, col = unpack(vim.api.nvim_win_get_cursor(0))
  return col ~= 0 and vim.api.nvim_buf_get_lines(0, line - 1, line, true)[1]:sub(col, col):match("%s") == nil
end

local border_opts = {
  border = "single",
  winhighlight = "Normal:Normal,FloatBorder:FloatBorder,CursorLine:Visual,Search:None",
}

cmp.setup {
  completion = {
    autocomplete = false
  },
  snippet = {
    expand = function(args)
      require('luasnip').lsp_expand(args.body)
    end,
  },
  mapping = {
    ['<Tab>'] = cmp.mapping(function(fallback)
          if cmp.visible() then
            cmp.select_next_item()
          elseif has_words_before() then
            cmp.complete()
          else
            fallback()
          end
        end, { "i", "s" }),
    ['<S-Tab>'] = cmp.mapping.select_prev_item(),
    ['<C-d>'] = cmp.mapping.scroll_docs(-4),
    ['<C-f>'] = cmp.mapping.scroll_docs(4),
    ['<C-e>'] = cmp.mapping.close(),
    ['<CR>'] = cmp.mapping.confirm {
      behavior = cmp.ConfirmBehavior.Replace,
      select = false,
    },
  },
  window = {
    completion = cmp.config.window.bordered(border_opts),
    documentation = cmp.config.window.bordered(border_opts),
  },
  sources = cmp.config.sources({
      { name = 'nvim_lsp', priority = 1000 },
      { name = 'luasnip', priority = 750 },
      { name = 'buffer', priority = 500 },
      { name = 'path', priority = 250 },
    }, {
    }),
}

cmp.setup.cmdline({ '/', '?' }, {
  mapping = cmp.mapping.preset.cmdline(),
  sources = {
    { name = 'buffer' }
  }
})

cmp.setup.cmdline(':', {
  mapping = cmp.mapping.preset.cmdline(),
  sources = cmp.config.sources({
    { name = 'path' }
  }, {
    { name = 'cmdline' }
  })
})