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<?php

declare(strict_types=1);

namespace Laminas\Feed\Reader\Extension\Syndication;

use DateTime;
use Laminas\Feed\Reader;
use Laminas\Feed\Reader\Extension;

use function array_key_exists;

class Feed extends Extension\AbstractFeed
{
    /**
     * Get update period
     *
     * @return string
     * @throws Reader\Exception\InvalidArgumentException
     */
    public function getUpdatePeriod()
    {
        $name   = 'updatePeriod';
        $period = $this->getData($name);

        if ($period === null) {
            $this->data[$name] = 'daily';
            return 'daily'; //Default specified by spec
        }

        switch ($period) {
            case 'hourly':
            case 'daily':
            case 'weekly':
            case 'yearly':
                return $period;
            default:
                throw new Reader\Exception\InvalidArgumentException(
                    "Feed specified invalid update period: '$period'."
                    . ' Must be one of hourly, daily, weekly or yearly'
                );
        }
    }

    /**
     * Get update frequency
     *
     * @return int
     */
    public function getUpdateFrequency()
    {
        $name = 'updateFrequency';
        $freq = $this->getData($name, 'number');

        if (! $freq || $freq < 1) {
            $this->data[$name] = 1;
            return 1;
        }

        return $freq;
    }

    /**
     * Get update frequency as ticks
     *
     * @return int
     */
    public function getUpdateFrequencyAsTicks()
    {
        $name = 'updateFrequency';
        $freq = $this->getData($name, 'number');

        if (! $freq || $freq < 1) {
            $this->data[$name] = 1;
            $freq              = 1;
        }

        $period = $this->getUpdatePeriod();
        $ticks  = 1;

        switch ($period) {
            case 'yearly':
                $ticks *= 52; //TODO: fix generalisation, how?
                // no break
            case 'weekly':
                $ticks *= 7;
                // no break
            case 'daily':
                $ticks *= 24;
                // no break
            case 'hourly':
                $ticks *= 3600;
                break;
            default: //Never arrive here, exception thrown in getPeriod()
                break;
        }

        return $ticks / $freq;
    }

    /**
     * Get update base
     *
     * @return null|DateTime
     */
    public function getUpdateBase()
    {
        $updateBase = $this->getData('updateBase');
        $date       = null;
        if ($updateBase) {
            $date = DateTime::createFromFormat(DateTime::W3C, $updateBase);
        }
        return $date;
    }

    /**
     * Get the entry data specified by name
     *
     * @param  string $name
     * @param  string $type
     * @return null|mixed
     */
    private function getData($name, $type = 'string')
    {
        if (array_key_exists($name, $this->data)) {
            return $this->data[$name];
        }

        $data = $this->xpath->evaluate($type . '(' . $this->getXpathPrefix() . '/syn10:' . $name . ')');

        if (! $data) {
            $data = null;
        }

        $this->data[$name] = $data;

        return $data;
    }

    /**
     * Register Syndication namespaces
     *
     * @return void
     */
    protected function registerNamespaces()
    {
        $this->xpath->registerNamespace('syn10', 'http://purl.org/rss/1.0/modules/syndication/');
    }
}