local M = {}

---filter passed to vim.lsp.buf.format
---always selects null-ls if it's available and caches the value per buffer
---@param client table client attached to a buffer
---@return boolean if client matches
function M.format_filter(client)
  local filetype = vim.bo.filetype
  local n = require('null-ls')
  local s = require('null-ls.sources')
  local method = n.methods.FORMATTING
  local available_formatters = s.get_available(filetype, method)

  if #available_formatters > 0 then
    return client.name == 'null-ls'
  elseif client.supports_method('textDocument/formatting') then
    return true
  else
    return false
  end
end

---Simple wrapper for vim.lsp.buf.format() to provide defaults
---@param opts table|nil
function M.format(opts)
  opts = opts or {}
  opts.filter = opts.filter or M.format_filter

  return vim.lsp.buf.format(opts)
end

return M