local lsp_zero = require('lsp-zero')
lsp_zero.on_attach(function(client, bufnr)
  lsp_zero.default_keymaps({buffer = bufnr})

  -- rename symbol
  vim.keymap.set('', '<F2>', vim.lsp.buf.rename, {noremap = true})

  -- tab completion
  lsp_zero.extend_cmp()
  local cmp = require('cmp')
  cmp.setup({
    mapping = cmp.mapping.preset.insert({
      ['<C-space>'] = cmp.mapping.complete(),

      ['<Tab>'] = cmp.mapping(
        function(fallback)
          if cmp.visible() then
            if #cmp.get_entries() == 1 then
              cmp.confirm({ select = true })
            else
              cmp.select_next_item()
            end
          else
            fallback()
          end
        end,
        { 'i', 's' }
      ),
      ['<S-Tab>'] = cmp.mapping.select_prev_item(),

      ['<CR>'] = cmp.mapping.confirm({ select = true }),
      -- ['<Esc>'] = cmp.mapping.abort(),
      
      ['<C-j>'] = cmp.mapping.scroll_docs(-4),
      ['<C-k>'] = cmp.mapping.scroll_docs(4),
    }),
  })


  -- signature help
  require('lsp_signature').on_attach({ floating_window_above_cur_line = true }, bufnr)

  -- auto-format
  -- vim.api.nvim_create_autocmd('BufWritePre', {
  --   callback = vim.lsp.buf.format,
  -- })
end)

local lsp_config = require('lspconfig')
lsp_config['clangd'].setup({})
lsp_config['rust_analyzer'].setup({})
lsp_config['texlab'].setup({})
lsp_config['pylsp'].setup({})