<?php

namespace Twilio;

class Values implements \ArrayAccess
{
    const NONE = 'Twilio\\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]);
    }

}
