local cmp = require('cmp')
local cmp_buffer = require('cmp_buffer')

cmp.setup({
  completion = {
    completeopt = 'menu,menuone,noinsert',
  },
  snippet = {
    expand = function(args)
      vim.fn["vsnip#anonymous"](args.body)
    end,
  },
  mapping = cmp.mapping.preset.insert({
    ['<C-u>'] = cmp.mapping.scroll_docs(-4),
    ['<C-d>'] = cmp.mapping.scroll_docs(4),
    ['<C-Space>'] = cmp.mapping.complete(),
    ['<C-e>'] = cmp.mapping.close(),
    ['C-y'] = cmp.mapping.confirm({ select = true, behaviour = cmp.ConfirmBehavior.Replace }),
    ['<CR>'] = cmp.mapping.confirm({ select = true, behaviour = cmp.ConfirmBehavior.Replace }),
  }),
  sources = cmp.config.sources({
    { name = 'copilot', keyword_length = 0 },
    { name = 'nvim_lsp', keyword_length = 3 },
    {
        name = 'buffer',
        option = {
          get_bufnrs = function()
            return vim.api.nvim_list_bufs()
          end
        },
    },
    { name = 'path' },
    { name = 'calc' },
  }),
  sorting = {
    comparators = {
      function(...) return cmp_buffer:compare_locality(...) end,
    }
  },
  view = {
    entries = 'native',
  },
  experimental = {
    ghost_text = true,
  },
})