// Licensed under the Apache License, Version 2.0 (the 'License'); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an 'AS IS' BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.

'use strict'

const debug = require('debug')('nano/logger')

module.exports = function logging (cfg) {
  const log = cfg && cfg.log
  const logStrategy = typeof log === 'function' ? log : debug

  return function logEvent (prefix) {
    const eventId = (prefix ? prefix + '-' : '') +
      (~~(Math.random() * 1e9)).toString(36)
    return function log () {
      logStrategy.call(this, eventId, [].slice.call(arguments, 0))
    }
  }
}