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<?php
/**
 * Case-insensitive dictionary, suitable for HTTP headers
 *
 * @package Requests
 */

/**
 * Case-insensitive dictionary, suitable for HTTP headers
 *
 * @package Requests
 */
class Requests_Response_Headers extends Requests_Utility_CaseInsensitiveDictionary {
    /**
     * Get the given header
     *
     * Unlike {@see self::getValues()}, this returns a string. If there are
     * multiple values, it concatenates them with a comma as per RFC2616.
     *
     * Avoid using this where commas may be used unquoted in values, such as
     * Set-Cookie headers.
     *
     * @param string $key
     * @return string|null Header value
     */
    public function offsetGet($key) {
        $key = strtolower($key);
        if (!isset($this->data[$key])) {
            return null;
        }

        return $this->flatten($this->data[$key]);
    }

    /**
     * Set the given item
     *
     * @throws Requests_Exception On attempting to use dictionary as list (`invalidset`)
     *
     * @param string $key Item name
     * @param string $value Item value
     */
    public function offsetSet($key, $value) {
        if ($key === null) {
            throw new Requests_Exception('Object is a dictionary, not a list', 'invalidset');
        }

        $key = strtolower($key);

        if (!isset($this->data[$key])) {
            $this->data[$key] = array();
        }

        $this->data[$key][] = $value;
    }

    /**
     * Get all values for a given header
     *
     * @param string $key
     * @return array|null Header values
     */
    public function getValues($key) {
        $key = strtolower($key);
        if (!isset($this->data[$key])) {
            return null;
        }

        return $this->data[$key];
    }

    /**
     * Flattens a value into a string
     *
     * Converts an array into a string by imploding values with a comma, as per
     * RFC2616's rules for folding headers.
     *
     * @param string|array $value Value to flatten
     * @return string Flattened value
     */
    public function flatten($value) {
        if (is_array($value)) {
            $value = implode(',', $value);
        }

        return $value;
    }

    /**
     * Get an iterator for the data
     *
     * Converts the internal
     * @return ArrayIterator
     */
    public function getIterator() {
        return new Requests_Utility_FilteredIterator($this->data, array($this, 'flatten'));
    }
}