<?php
class RSSFilterBridge extends FeedExpander {

    const MAINTAINER = 'Akamaru';
    const NAME = 'RSS Filter Bridge';
    const URI = 'https://github.com/RSS-Bridge/rss-bridge';
    const CACHE_TIMEOUT = 3600;
    const DESCRIPTION = 'Filter and modify elements from any RSS/Atom feed';

    const PARAMETERS = [
        [
            'feed_url' => [
                'name' => 'Feed URL',
                'type' => 'text',
                'required' => true,
                'exampleValue' => 'https://example.com/rss.xml',
                'title' => 'URL of the RSS/Atom feed to filter'
            ],
            'custom_icon' => [
                'name' => 'Custom Icon URL',
                'type' => 'text',
                'required' => false,
                'exampleValue' => 'https://example.com/icon.png',
                'title' => 'Optional: Custom icon URL (if empty, will try to extract favicon from feed URL)'
            ],
            'remove_description' => [
                'name' => 'Remove Description',
                'type' => 'checkbox',
                'title' => 'Remove the description/content from feed items'
            ],
            'remove_content' => [
                'name' => 'Remove Content',
                'type' => 'checkbox',
                'title' => 'Remove the full content from feed items'
            ],
            'remove_author' => [
                'name' => 'Remove Author',
                'type' => 'checkbox',
                'title' => 'Remove author information'
            ],
            'remove_categories' => [
                'name' => 'Remove Categories',
                'type' => 'checkbox',
                'title' => 'Remove categories/tags'
            ],
            'remove_enclosures' => [
                'name' => 'Remove Enclosures',
                'type' => 'checkbox',
                'title' => 'Remove attachments/media (images, audio, video)'
            ],
            'remove_timestamp' => [
                'name' => 'Remove Timestamp',
                'type' => 'checkbox',
                'title' => 'Remove date/time information'
            ],
            'title_only' => [
                'name' => 'Title Only Mode',
                'type' => 'checkbox',
                'title' => 'Keep only title and link (removes everything else)'
            ],
            'limit' => [
                'name' => 'Item Limit',
                'type' => 'number',
                'required' => false,
                'defaultValue' => 20,
                'title' => 'Maximum number of items to return (default: 20)'
            ]
        ]
    ];

    public function collectData() {
        $feedUrl = $this->getInput('feed_url');

        if (empty($feedUrl)) {
            returnClientError('Feed URL is required');
        }

        $this->collectExpandableDatas($feedUrl);
    }

    protected function parseItem(array $item) {
        $filteredItem = [];

        // Title and URI are always kept (required for RSS)
        $filteredItem['title'] = $item['title'] ?? 'No title';
        $filteredItem['uri'] = $item['uri'] ?? $item['link'] ?? '';
        $filteredItem['uid'] = $item['uid'] ?? $item['guid'] ?? $filteredItem['uri'];

        // Title Only Mode - skip all other fields
        if ($this->getInput('title_only')) {
            return $filteredItem;
        }

        // Content/Description filtering
        if (!$this->getInput('remove_content') && !$this->getInput('remove_description')) {
            $filteredItem['content'] = $item['content'] ?? $item['description'] ?? '';
        } elseif (!$this->getInput('remove_content') && isset($item['content'])) {
            $filteredItem['content'] = $item['content'];
        } elseif (!$this->getInput('remove_description') && isset($item['description'])) {
            $filteredItem['content'] = $item['description'];
        }

        // Author filtering
        if (!$this->getInput('remove_author') && isset($item['author'])) {
            $filteredItem['author'] = $item['author'];
        }

        // Categories filtering
        if (!$this->getInput('remove_categories') && isset($item['categories'])) {
            $filteredItem['categories'] = $item['categories'];
        }

        // Enclosures filtering (images, audio, video)
        if (!$this->getInput('remove_enclosures') && isset($item['enclosures'])) {
            $filteredItem['enclosures'] = $item['enclosures'];
        }

        // Timestamp filtering
        if (!$this->getInput('remove_timestamp') && isset($item['timestamp'])) {
            $filteredItem['timestamp'] = $item['timestamp'];
        }

        return $filteredItem;
    }

    public function getItems() {
        $items = parent::getItems();
        $limit = $this->getInput('limit') ?: 20;

        return array_slice($items, 0, $limit);
    }

    public function getName() {
        if ($this->getInput('feed_url')) {
            return 'RSS Filter: ' . parse_url($this->getInput('feed_url'), PHP_URL_HOST);
        }
        return parent::getName();
    }

    public function getIcon() {
        // Use custom icon if provided
        if ($this->getInput('custom_icon')) {
            return $this->getInput('custom_icon');
        }

        // Extract favicon from feed URL
        $feedUrl = $this->getInput('feed_url');
        if ($feedUrl) {
            $parsedUrl = parse_url($feedUrl);
            if (isset($parsedUrl['scheme']) && isset($parsedUrl['host'])) {
                return $parsedUrl['scheme'] . '://' . $parsedUrl['host'] . '/favicon.ico';
            }
        }

        // Fallback to default
        return parent::getIcon();
    }
}