<?php
namespace Isekai\Widgets;

use ApiMain;
use Exception;
use MediaWiki\Request\FauxRequest;
use MediaWiki\Title\Title;
use MediaWiki\Html\Html;
use MediaWiki\Parser\Parser;
use PPFrame;

class PreviewPageListWidget {
    public const CONTAINER_CLASS_NAME = 'isekai-card isekai-preview-page-list-card';

    /**
     * Build fallback list for browsers that don't support JS and for SEO
     * @param string[] $pageList
     * @return string
     */
    public static function buildFallbackPageList($pageList) {
        $pageListHtml = [];
        foreach ($pageList as $pageTitle) {
            $title = Title::newFromText($pageTitle);
            if ($title) {
                $pageListHtml[] = Html::rawElement('a', ['class' => 'isekai-list-item', 'href' => $title->getLocalURL()],
                    Html::rawElement('div', ['class' => 'isekai-list-item-content'],
                        Html::element('div', ['class' => 'isekai-list-item-title'], $title->getPrefixedText())
                    )
                );
            }
        }

        return 
        Html::openElement('div', [
            'class' => 'fallback-page-list'
        ]) . Html::openElement('ul', [
            'class' => 'isekai-list'
        ]) .
        implode("\n", $pageListHtml) .
        Html::closeElement('ul') .
        Html::closeElement('div');
    }

    public static function create($text, $params, Parser $parser, PPFrame $frame) {
        $parser->getOutput()->addModules(['ext.isekai.previewPageList']);
        
        $loader = $params['loader'] ?? 'unknown';
        if ($loader === 'unknown' && !empty(trim($text))) {
            $loader = 'pages';
        }

        $autoFocus = $params['autofocus'] ?? false;
        if ($autoFocus === 'false' || $autoFocus === '0') {
            $autoFocus = false;
        } else {
            $autoFocus = true;
        }

        $lazyLoad = $params['lazyload'] ?? false;
        if ($lazyLoad === 'false' || $lazyLoad === '0') {
            $lazyLoad = false;
        } else {
            $lazyLoad = true;
        }

        $resultHtml = null;
        switch ($loader) {
            case 'pages':
                $pageList = explode("\n", trim($text));
                $pageList = array_map(function ($page) {
                    return trim($page);
                }, $pageList);

                $resultHtml = Html::openElement('div', [
                    'class' => self::CONTAINER_CLASS_NAME,
                    'data-loader' => $loader,
                    'data-autofocus' => $autoFocus,
                    'data-lazyload' => $lazyLoad,
                ]) .
                Html::openElement('script', [
                    'type' => 'application/json',
                    'data-pages' => true,
                ]) .
                json_encode($pageList) .
                Html::closeElement('script') .
                self::buildFallbackPageList($pageList) .
                Html::closeElement('div');
                break;
            case 'category':
                $category = $params['category'] ?? null;
                if (!$category) {
                    return Html::element('span', [
                        'class' => 'error'
                    ], wfMessage('isekai-preview-page-list-error-invalid-category')->parse());
                }

                $categoryTitle = Title::newFromText($category, NS_CATEGORY);
                $categoryTitleText = $categoryTitle->getPrefixedText();

                $pageList = [];
                
                $request = [
                    'action' => 'query',
                    'list' => 'categorymembers',
                    'cmtitle' => $categoryTitleText,
                    'cmtype' => 'page',
                    'cmnamespace' => 0,
                    'cmlimit' => 100,
                    'cmsort' => 'sortkey',
                ];

                $api = new ApiMain(new FauxRequest($request));
                try {
                    $api->execute();
                    $categoryMembers = $api->getResult()->getResultData(['query', 'categorymembers']);
                    foreach ($categoryMembers as $categoryMember) {
                        if (is_array($categoryMember) && isset($categoryMember['title'])) {
                            $pageList[] = $categoryMember['title'];
                        }
                    }
                } catch (Exception $e) {
                    wfDebugLog('exception', $e->getMessage(), 'all', [
                        'exception' => $e
                    ]);
                }

                $resultHtml = Html::openElement('div', [
                    'class' => self::CONTAINER_CLASS_NAME,
                    'data-loader' => $loader,
                    'data-category' => $categoryTitleText,
                    'data-autofocus' => $autoFocus,
                    'data-lazyload' => $lazyLoad,
                ]) .
                self::buildFallbackPageList($pageList) .
                Html::closeElement('div');
                break;
        }

        if (!$resultHtml) {
            $resultHtml = Html::element('span', [
                'class' => 'error'
            ], wfMessage('isekai-preview-page-list-error-invalid-loader', $loader)->parse());
        }

        return $resultHtml;
    }
}