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<?php
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namespace Kevinrob\GuzzleCache;
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class KeyValueHttpHeader implements \Iterator
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{
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    /**
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     * Take from https://github.com/hapijs/wreck.
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     */
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    const REGEX_SPLIT = '/(?:^|(?:\s*\,\s*))([^\x00-\x20\(\)<>@\,;\:\\\\"\/\[\]\?\=\{\}\x7F]+)(?:\=(?:([^\x00-\x20\(\)<>@\,;\:\\\\"\/\[\]\?\=\{\}\x7F]+)|(?:\"((?:[^"\\\\]|\\\\.)*)\")))?/';
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    /**
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     * @var string[]
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     */
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    protected $values = [];
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    /**
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     * @param array $values
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     */
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    public function __construct(array $values)
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    {
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        foreach ($values as $value) {
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            $matches = [];
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            if (preg_match_all(self::REGEX_SPLIT, $value, $matches, PREG_SET_ORDER)) {
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                foreach ($matches as $match) {
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                    $val = '';
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                    if (count($match) == 3) {
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                        $val = $match[2];
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                    } elseif (count($match) > 3) {
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                        $val = $match[3];
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                    }
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                    $this->values[$match[1]] = $val;
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                }
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            }
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        }
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    }
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    /**
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     * @param string $key
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     *
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     * @return bool
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     */
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    public function has($key)
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    {
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        // For performance, we can use isset,
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        // but it will not match if value == 0
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        return isset($this->values[$key]) || array_key_exists($key, $this->values);
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    }
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    /**
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     * @param string $key
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     * @param string $default the value to return if don't exist
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     * @return string
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     */
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    public function get($key, $default = '')
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    {
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        if ($this->has($key)) {
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            return $this->values[$key];
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        }
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        return $default;
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    }
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    /**
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     * @return bool
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     */
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    public function isEmpty()
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    {
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        return count($this->values) === 0;
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    }
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    /**
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     * Return the current element
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     * @link http://php.net/manual/en/iterator.current.php
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     * @return mixed Can return any type.
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     * @since 5.0.0
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     */
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    #[\ReturnTypeWillChange]
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    public function current()
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    {
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        return current($this->values);
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    }
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    /**
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     * Move forward to next element
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     * @link http://php.net/manual/en/iterator.next.php
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     * @return void Any returned value is ignored.
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     * @since 5.0.0
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     */
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    public function next(): void
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    {
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        next($this->values);
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    }
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    /**
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     * Return the key of the current element
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     * @link http://php.net/manual/en/iterator.key.php
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     * @return mixed scalar on success, or null on failure.
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     * @since 5.0.0
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     *
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     */
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    #[\ReturnTypeWillChange]
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    public function key()
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    {
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        return key($this->values);
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    }
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    /**
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     * Checks if current position is valid
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     * @link http://php.net/manual/en/iterator.valid.php
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     * @return boolean The return value will be casted to boolean and then evaluated.
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     * Returns true on success or false on failure.
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     * @since 5.0.0
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     */
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    public function valid(): bool
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    {
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        return key($this->values) !== null;
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    }
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    /**
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     * Rewind the Iterator to the first element
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     * @link http://php.net/manual/en/iterator.rewind.php
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     * @return void Any returned value is ignored.
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     * @since 5.0.0
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     */
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    public function rewind(): void
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    {
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        reset($this->values);
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    }
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}