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<?php

namespace Laminas\Http\Header;

use Laminas\Http\Header\Accept\FieldValuePart;
use Laminas\Http\Header\Accept\FieldValuePart\LanguageFieldValuePart;

use function strpos;
use function substr;
use function trim;

/**
 * Accept Language Header
 *
 * @see        http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.4
 */
class AcceptLanguage extends AbstractAccept
{
    /** @var string */
    protected $regexAddType = '#^([a-zA-Z0-9+-]+|\*)$#';

    /**
     * Get field name
     *
     * @return string
     */
    public function getFieldName()
    {
        return 'Accept-Language';
    }

    /**
     * Cast to string
     *
     * @return string
     */
    public function toString()
    {
        return 'Accept-Language: ' . $this->getFieldValue();
    }

    /**
     * Add a language, with the given priority
     *
     * @param  string $type
     * @param  int|float $priority
     * @return $this
     */
    public function addLanguage($type, $priority = 1)
    {
        return $this->addType($type, $priority);
    }

    /**
     * Does the header have the requested language?
     *
     * @param  string $type
     * @return bool
     */
    public function hasLanguage($type)
    {
        return $this->hasType($type);
    }

    /**
     * Parse the keys contained in the header line
     *
     * @see \Laminas\Http\Header\AbstractAccept::parseFieldValuePart()
     *
     * @param string $fieldValuePart
     * @return LanguageFieldValuePart
     */
    protected function parseFieldValuePart($fieldValuePart)
    {
        $raw = $fieldValuePart;
        if ($pos = strpos($fieldValuePart, '-')) {
            $type = trim(substr($fieldValuePart, 0, $pos));
        } else {
            $type = trim(substr($fieldValuePart, 0));
        }

        $params = $this->getParametersFromFieldValuePart($fieldValuePart);

        if ($pos = strpos($fieldValuePart, ';')) {
            $fieldValuePart = $type = trim(substr($fieldValuePart, 0, $pos));
        }

        if (strpos($fieldValuePart, '-')) {
            $subtypeWhole = $format = $subtype = trim(substr($fieldValuePart, strpos($fieldValuePart, '-') + 1));
        } else {
            $subtypeWhole = '';
            $format       = '*';
            $subtype      = '*';
        }

        $aggregated = [
            'typeString' => trim($fieldValuePart),
            'type'       => $type,
            'subtype'    => $subtype,
            'subtypeRaw' => $subtypeWhole,
            'format'     => $format,
            'priority'   => $params['q'] ?? 1,
            'params'     => $params,
            'raw'        => trim($raw),
        ];

        return new FieldValuePart\LanguageFieldValuePart((object) $aggregated);
    }
}