import baseProperty from './baseProperty';
import constant from '../utility/constant';
import realNames from './realNames';
import support from '../support';

/**
 * Gets the name of `func`.
 *
 * @private
 * @param {Function} func The function to query.
 * @returns {string} Returns the function name.
 */
var getFuncName = (function() {
  if (!support.funcNames) {
    return constant('');
  }
  if (constant.name == 'constant') {
    return baseProperty('name');
  }
  return function(func) {
    var result = func.name,
        array = realNames[result],
        length = array ? array.length : 0;

    while (length--) {
      var data = array[length],
          otherFunc = data.func;

      if (otherFunc == null || otherFunc == func) {
        return data.name;
      }
    }
    return result;
  };
}());

export default getFuncName;