function isObject(subject) {
  return subject instanceof Object || (typeof subject === 'object' && subject !== null);
}

function isString(subject) {
  return typeof subject === 'string';
}

// Search for some string inside any object or array
function search(object, query, property = null, result = []) {
  // Create the search pattern
  const pattern = new RegExp(query.trim(), 'i');

  Object.keys(object).forEach(key => {
    const item = object[key];

    // Stop here if item is empty
    if (!item) {
      return;
    }

    // Get the value to be compared
    const value = isString(property) ? item[property] : item;

    // Check if the value match the pattern
    if (isString(value) && pattern.test(value)) {
      // Add the current item to the result
      result.push(item);
    }

    if (isObject(item)) {
      // Search recursively the item if the current item is an object
      search(item, query, property, result);
    }
  });

  // Return the found items
  return result;
}

// Encode any string into a safe format for HTML id attribute
function encodeId(input) {
  const string = input && input.toString ? input.toString() : input;

  // Return an underscore if the given string is empty or if it's not a string
  if (string === '' || typeof string !== 'string') {
    return '_';
  }

  // Create a converter to replace non accepted chars
  const converter = match => '_' + match[0].charCodeAt(0).toString(16) + '_';

  // Encode the given string and return it
  return string.replace(/[^a-zA-Z0-9-]/g, converter);
}

const string = {
  search,
  encodeId,
};

export default string;