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<?php

/**
 * Matomo - free/libre analytics platform
 *
 * @link https://matomo.org
 * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
 *
 */
namespace Piwik\DataTable\Renderer;

use Exception;
use Piwik\Archive;
use Piwik\Common;
use Piwik\DataTable\Renderer;
use Piwik\DataTable;
use Piwik\Date;
use Piwik\SettingsPiwik;
/**
 * RSS Feed.
 * The RSS renderer can be used only on Set that are arrays of DataTable.
 * A RSS feed contains one dataTable per element in the Set.
 *
 */
class Rss extends Renderer
{
    /**
     * Computes the dataTable output and returns the string/binary
     *
     * @return string
     */
    public function render()
    {
        return $this->renderTable($this->table);
    }
    /**
     * Computes the output for the given data table
     *
     * @param DataTable $table
     * @return string
     * @throws Exception
     */
    protected function renderTable($table)
    {
        if (!$table instanceof DataTable\Map || $table->getKeyName() != 'date') {
            throw new Exception("RSS feeds can be generated for one specific website &idSite=X." . "\nPlease specify only one idSite or consider using &format=XML instead.");
        }
        $idSite = Common::getRequestVar('idSite', 1, 'int');
        $period = Common::getRequestVar('period');
        $piwikUrl = SettingsPiwik::getPiwikUrl() . "?module=CoreHome&action=index&idSite=" . $idSite . "&period=" . $period;
        $out = "";
        $moreRecentFirst = array_reverse($table->getDataTables(), true);
        foreach ($moreRecentFirst as $date => $subtable) {
            /** @var DataTable $subtable */
            $timestamp = $subtable->getMetadata(Archive\DataTableFactory::TABLE_METADATA_PERIOD_INDEX)->getDateStart()->getTimestamp();
            $site = $subtable->getMetadata(Archive\DataTableFactory::TABLE_METADATA_SITE_INDEX);
            $pudDate = date('r', $timestamp);
            $dateInSiteTimezone = Date::factory($timestamp);
            if ($site) {
                $dateInSiteTimezone = $dateInSiteTimezone->setTimezone($site->getTimezone());
            }
            $dateInSiteTimezone = $dateInSiteTimezone->toString('Y-m-d');
            $thisPiwikUrl = Common::sanitizeInputValue($piwikUrl . "&date={$dateInSiteTimezone}");
            $siteName = $site ? $site->getName() : '';
            $title = $siteName . " on " . $date;
            $out .= "\t<item>\n\t\t<pubDate>{$pudDate}</pubDate>\n\t\t<guid>{$thisPiwikUrl}</guid>\n\t\t<link>{$thisPiwikUrl}</link>\n\t\t<title>{$title}</title>\n\t\t<author>https://matomo.org</author>\n\t\t<description>";
            $out .= Common::sanitizeInputValue($this->renderDataTable($subtable));
            $out .= "</description>\n\t</item>\n";
        }
        $header = $this->getRssHeader();
        $footer = $this->getRssFooter();
        return $header . $out . $footer;
    }
    /**
     * Returns the RSS file footer
     *
     * @return string
     */
    protected function getRssFooter()
    {
        return "\t</channel>\n</rss>";
    }
    /**
     * Returns the RSS file header
     *
     * @return string
     */
    protected function getRssHeader()
    {
        $generationDate = date('r', Date::getNowTimestamp());
        $header = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<rss version=\"2.0\">\n  <channel>\n    <title>matomo statistics - RSS</title>\n    <link>https://matomo.org</link>\n    <description>Matomo RSS feed</description>\n    <pubDate>{$generationDate}</pubDate>\n    <generator>matomo</generator>\n    <language>en</language>\n    <lastBuildDate>{$generationDate}</lastBuildDate>\n";
        return $header;
    }
    /**
     * @param DataTable $table
     *
     * @return string
     */
    protected function renderDataTable($table)
    {
        if ($table->getRowsCount() == 0) {
            return "<strong><em>Empty table</em></strong><br />\n";
        }
        $i = 1;
        $tableStructure = array();
        /*
         * table = array
         * ROW1 = col1 | col2 | col3 | metadata | idSubTable
         * ROW2 = col1 | col2 (no value but appears) | col3 | metadata | idSubTable
         *         subtable here
         */
        $allColumns = array();
        foreach ($table->getRows() as $row) {
            foreach ($row->getColumns() as $column => $value) {
                // for example, goals data is array: not supported in export RSS
                // in the future we shall reuse ViewDataTable for html exports in RSS anyway
                if (is_array($value) || is_object($value)) {
                    continue;
                }
                $allColumns[$column] = true;
                $tableStructure[$i][$column] = $value;
            }
            $i++;
        }
        $html = "\n";
        $html .= "<table border=1 width=70%>";
        $html .= "\n<tr>";
        foreach ($allColumns as $name => $toDisplay) {
            if ($toDisplay !== false) {
                if ($this->translateColumnNames) {
                    $name = $this->translateColumnName($name);
                }
                $html .= "\n\t<td><strong>{$name}</strong></td>";
            }
        }
        $html .= "\n</tr>";
        foreach ($tableStructure as $row) {
            $html .= "\n\n<tr>";
            foreach ($allColumns as $columnName => $toDisplay) {
                if ($toDisplay !== false) {
                    $value = "-";
                    if (isset($row[$columnName])) {
                        $value = urldecode($row[$columnName]);
                    }
                    $html .= "\n\t<td>{$value}</td>";
                }
            }
            $html .= "</tr>";
        }
        $html .= "\n\n</table>";
        return $html;
    }
}