<?php

/**
 * @package     Dotclear
 *
 * @copyright   Olivier Meunier & Association Dotclear
 * @copyright   AGPL-3.0
 */
declare(strict_types=1);

namespace Dotclear\Plugin\blogroll;

use Exception;
use stdClass;

/**
 * @brief   The module import utils.
 * @ingroup blogroll
 */
class UtilsImport
{
    /**
     * Loads a file.
     *
     * @param   string  $file   The file
     *
     * @return  array<int,stdClass>|false
     */
    public static function loadFile(string $file): false|array
    {
        if (file_exists($file) && is_readable($file) && ($data = file_get_contents($file))) {
            if (preg_match('!<xbel(\s+version)?!', $data)) {
                return self::parseXBEL($data);
            }
            if (preg_match('!<opml(\s+version)?!', $data)) {
                return self::parseOPML($data);
            }

            throw new Exception(__('You need to provide a XBEL or OPML file.'));
        }

        return false;
    }

    /**
     * Parse OPML format.
     *
     * @param   string  $data   The data to parse
     *
     * @return  array<int,stdClass>
     */
    protected static function parseOPML(string $data): array
    {
        $xml = @simplexml_load_string($data);
        if (!$xml) {
            throw new Exception(__('File is not in XML format.'));
        }

        $outlines = $xml->xpath('//outline');

        $list = [];
        if ($outlines) {
            foreach ($outlines as $outline) {
                if (isset($outline['htmlUrl'])) {
                    $link = $outline['htmlUrl'];
                } elseif (isset($outline['url'])) {
                    $link = $outline['url'];
                } else {
                    continue;
                }

                $entry = new stdClass();

                $entry->link  = $link;
                $entry->title = empty($outline['title']) ? '' : $outline['title'];
                $entry->desc  = empty($outline['description']) ? '' : $outline['description'];

                if (empty($entry->title)) {
                    $entry->title = empty($outline['text']) ? $entry->link : $outline['text'];
                }

                $list[] = $entry;
            }
        }

        return $list;
    }

    /**
     * Parse XBEL format.
     *
     * @param   string  $data   The data to parse
     *
     * @return  array<int,stdClass>
     */
    protected static function parseXBEL($data): array
    {
        $xml = @simplexml_load_string($data);
        if (!$xml) {
            throw new Exception(__('File is not in XML format.'));
        }

        $outlines = $xml->xpath('//bookmark');

        $list = [];
        if ($outlines) {
            foreach ($outlines as $outline) {
                if (!isset($outline['href'])) {
                    continue;
                }

                $entry = new stdClass();

                $entry->link  = $outline['href'];
                $entry->title = empty($outline->title) ? '' : $outline->title;
                $entry->desc  = empty($outline->desc) ? '' : $outline->desc;

                if (empty($entry->title)) {
                    $entry->title = $entry->link;
                }

                $list[] = $entry;
            }
        }

        return $list;
    }
}
