<?php

/**
 * Gelato Library
 *
 * This source file is part of the Gelato Library. More information,
 * documentation and tutorials can be found at http://gelato.monstra.org
 *
 * @package     Gelato
 *
 * @author      Romanenko Sergey / Awilum <awilum@msn.com>
 * @copyright   2012-2013 Romanenko Sergey / Awilum <awilum@msn.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

class Arr
{
    /**
     * Protected constructor since this is a static class.
     *
     * @access  protected
     */
    protected function __construct()
    {
        // Nothing here
    }

    /**
     * Subval sort
     *
     *  <code>
     *      $new_array = Arr::subvalSort($old_array, 'sort');
     *  </code>
     *
     * @param  array  $a      Array
     * @param  string $subkey Key
     * @param  string $order  Order type DESC or ASC
     * @return array
     */
    public static function subvalSort($a, $subkey, $order = null)
    {
        if (count($a) != 0 || (!empty($a))) {
            foreach ($a as $k => $v) $b[$k] = function_exists('mb_strtolower') ? mb_strtolower($v[$subkey]) : strtolower($v[$subkey]);
            if ($order == null || $order == 'ASC') asort($b); else if ($order == 'DESC') arsort($b);
            foreach ($b as $key => $val) $c[] = $a[$key];

            return $c;
        }
    }

    /**
     * Returns value from array using "dot notation".
     * If the key does not exist in the array, the default value will be returned instead.
     *
     *  <code>
     *      $login = Arr::get($_POST, 'login');
     *
     *      $array = array('foo' => 'bar');
     *      $foo = Arr::get($array, 'foo');
     *
     *      $array = array('test' => array('foo' => 'bar'));
     *      $foo = Arr::get($array, 'test.foo');
     *  </code>
     *
     * @param  array  $array   Array to extract from
     * @param  string $path    Array path
     * @param  mixed  $default Default value
     * @return mixed
     */
    public static function get($array, $path, $default = null)
    {
        // Get segments from path
        $segments = explode('.', $path);

        // Loop through segments
        foreach ($segments as $segment) {

            // Check
            if ( ! is_array($array) || !isset($array[$segment])) {
                return $default;
            }

            // Write
            $array = $array[$segment];
        }

        // Return
        return $array;
    }

    /**
     * Deletes an array value using "dot notation".
     *
     *  <code>
     *      Arr::delete($array, 'foo.bar');
     *  </code>
     *
     * @access  public
     * @param  array   $array Array you want to modify
     * @param  string  $path  Array path
     * @return boolean
     */
    public static function delete(&$array, $path)
    {
        // Get segments from path
        $segments = explode('.', $path);

        // Loop through segments
        while (count($segments) > 1) {

            $segment = array_shift($segments);

            if ( ! isset($array[$segment]) || !is_array($array[$segment])) {
                return false;
            }

            $array =& $array[$segment];
        }

        unset($array[array_shift($segments)]);

        return true;
    }

    /**
     * Checks if the given dot-notated key exists in the array.
     *
     *  <code>
     *      if (Arr::keyExists($array, 'foo.bar')) {
     *          // Do something...
     *      }
     *  </code>
     *
     * @param  array   $array The search array
     * @param  mixed   $path  Array path
     * @return boolean
     */
    public static function keyExists($array, $path)
    {
        foreach (explode('.', $path) as $segment) {

            if ( ! is_array($array) or ! array_key_exists($segment, $array)) {
                return false;
            }

            $array = $array[$segment];
        }

        return true;
    }

    /**
     * Returns a random value from an array.
     *
     *  <code>
     *      Arr::random(array('php', 'js', 'css', 'html'));
     *  </code>
     *
     * @access  public
     * @param  array $array Array path
     * @return mixed
     */
    public static function random($array)
    {
        return $array[array_rand($array)];
    }

    /**
     * Returns TRUE if the array is associative and FALSE if not.
     *
     *  <code>
     *      if (Arr::isAssoc($array)) {
     *          // Do something...
     *      }
     *  </code>
     *
     * @param  array   $array Array to check
     * @return boolean
     */
    public static function isAssoc($array)
    {
        return (bool) count(array_filter(array_keys($array), 'is_string'));
    }

}