local config = require('cosmic.core.user')
local augroup_name = 'CosmicNvimLspFormat'
local group = vim.api.nvim_create_augroup(augroup_name, { clear = true })
local M = {}

local auto_format_lock = false

function M.on_attach(client, bufnr)
  local function buf_set_option(...)
    vim.api.nvim_buf_set_option(bufnr, ...)
  end

  -- Enable completion triggered by <c-x><c-o>
  buf_set_option('omnifunc', 'v:lua.vim.lsp.omnifunc')

  if config.lsp.can_client_format(client.name) then
    client.server_capabilities.documentFormatting = true
    client.server_capabilities.documentRangeFormatting = true
    -- check user config to see if we can format on save
    if config.lsp.format_on_save and not auto_format_lock then
      auto_format_lock = true -- just run autocommand once
      local format_filetypes = ''
      if vim.tbl_islist(config.lsp.format_on_save) then
        for _, ft in pairs(config.lsp.format_on_save) do
          format_filetypes = format_filetypes .. '*' .. ft
        end
      else
        format_filetypes = '*'
      end

      vim.api.nvim_create_autocmd(string.format('BufWritePre %s', format_filetypes), {
        callback = function()
          vim.lsp.buf.format({
            timeout_ms = config.lsp.format_timeout,
          })
        end,
        group = group,
        nested = true,
      })
    end
  else
    client.server_capabilities.documentFormatting = false
    client.server_capabilities.documentRangeFormatting = false
  end

  require('cosmic.lsp.mappings').init(client, bufnr)
end

M.flags = {
  debounce_text_changes = 150,
}

M.capabilities = {}

M.root_dir = function(fname)
  local util = require('lspconfig').util
  return util.root_pattern('.git')(fname)
    or util.root_pattern('tsconfig.base.json')(fname)
    or util.root_pattern('package.json')(fname)
    or util.root_pattern('.eslintrc.js')(fname)
    or util.root_pattern('tsconfig.json')(fname)
end

M.autostart = true

M.single_file_support = true

return M