<?php

class FeedMergeBridge extends FeedExpander {
	const MAINTAINER = 'dvikan';
	const NAME = 'FeedMerge';
	const URI = 'https://github.com/RSS-Bridge/rss-bridge';
	const DESCRIPTION = <<<'TEXT'
This bridge merges two or more feeds into a single feed. Max 10 items are fetched from each feed.
TEXT;

	const PARAMETERS = [
		[
			'feed_name' => [
				'name' => 'Feed name',
				'type' => 'text',
				'exampleValue' => 'rss-bridge/FeedMerger',
			],
			'feed_1' => [
				'name' => 'Feed url',
				'type' => 'text',
				'required' => true,
				'exampleValue' => 'https://lorem-rss.herokuapp.com/feed?unit=day'
			],
			'feed_2' => ['name' => 'Feed url', 'type' => 'text'],
			'feed_3' => ['name' => 'Feed url', 'type' => 'text'],
			'feed_4' => ['name' => 'Feed url', 'type' => 'text'],
			'feed_5' => ['name' => 'Feed url', 'type' => 'text'],

			'limit' => self::LIMIT,
		]
	];

	public function collectData() {
		$limit = (int)($this->getInput('limit') ?: 10);
		$feeds = [
			$this->getInput('feed_1'),
			$this->getInput('feed_2'),
			$this->getInput('feed_3'),
			$this->getInput('feed_4'),
			$this->getInput('feed_5'),
		];
		// Remove empty values
		$feeds = array_filter($feeds);
		foreach ($feeds as $feed) {
			// Fetch all items from the feed
			$this->collectExpandableDatas($feed);
		}
		// Sort by timestamp descending
		usort($this->items, fn($a, $b) => $b['timestamp'] <=> $a['timestamp']);
		// Grab the first $limit items
		$this->items = array_slice($this->items, 0, $limit);
	}

	public function getIcon() {
		return 'https://cdn.jsdelivr.net/npm/famfamfam-silk@1.0.0/dist/png/folder_feed.png';
	}

	public function getName() {
		return $this->getInput('feed_name') ?: 'rss-bridge/FeedMerger';
	}
}
