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<?php
namespace Angelfon\SDK;

class Values implements \ArrayAccess {
  const NONE = 'Angelfon\\SDK\\Values\\NONE';

  protected $options;

  public static function array_get($array, $key, $default = null) {
    if (array_key_exists($key, $array)) {
      return $array[$key];
    }
    return $default;
  }

  public static function of($array) {
    $result = array();
    foreach ($array as $key => $value) {
      if ($value === self::NONE) {
        continue;
      }
      $result[$key] = $value;
    }
    return $result;
  }

  public function __construct($options) {
    $this->options = array();
    foreach ($options as $key => $value) {
        $this->options[strtolower($key)] = $value;
    }
  }

  /**
   * (PHP 5 &gt;= 5.0.0)<br/>
   * Whether a offset exists
   * @link http://php.net/manual/en/arrayaccess.offsetexists.php
   * @param mixed $offset <p>
   * An offset to check for.
   * </p>
   * @return boolean true on success or false on failure.
   * </p>
   * <p>
   * The return value will be casted to boolean if non-boolean was returned.
   */
  public function offsetExists($offset) {
    return true;
  }

  /**
   * (PHP 5 &gt;= 5.0.0)<br/>
   * Offset to retrieve
   * @link http://php.net/manual/en/arrayaccess.offsetget.php
   * @param mixed $offset <p>
   * The offset to retrieve.
   * </p>
   * @return mixed Can return all value types.
   */
  public function offsetGet($offset) {
    $offset = strtolower($offset);
    return array_key_exists($offset, $this->options) ? $this->options[$offset] : self::NONE;
  }

  /**
   * (PHP 5 &gt;= 5.0.0)<br/>
   * Offset to set
   * @link http://php.net/manual/en/arrayaccess.offsetset.php
   * @param mixed $offset <p>
   * The offset to assign the value to.
   * </p>
   * @param mixed $value <p>
   * The value to set.
   * </p>
   * @return void
   */
  public function offsetSet($offset, $value) {
    $this->options[strtolower($offset)] = $value;
  }

  /**
   * (PHP 5 &gt;= 5.0.0)<br/>
   * Offset to unset
   * @link http://php.net/manual/en/arrayaccess.offsetunset.php
   * @param mixed $offset <p>
   * The offset to unset.
   * </p>
   * @return void
   */
  public function offsetUnset($offset) {
    unset($this->options[$offset]);
  }
}