<?php
declare(strict_types=1);

/**
 * @param array<FreshRSS_Feed> $feeds
 * @return array<array<string,string|null>>
 */
function feedsToOutlines(array $feeds, bool $excludeMutedFeeds = false): array {
	$outlines = [];
	foreach ($feeds as $feed) {
		if ($feed->mute() && $excludeMutedFeeds) {
			continue;
		}

		$outline = [
			'text' => htmlspecialchars_decode($feed->name(), ENT_QUOTES),
			'type' => FreshRSS_Export_Service::TYPE_RSS_ATOM,
			'xmlUrl' => htmlspecialchars_decode($feed->url(), ENT_QUOTES),
			'htmlUrl' => htmlspecialchars_decode($feed->website(), ENT_QUOTES),
			'description' => htmlspecialchars_decode($feed->description(), ENT_QUOTES),
		];

		if ($feed->kind() === FreshRSS_Feed::KIND_HTML_XPATH || $feed->kind() === FreshRSS_Feed::KIND_XML_XPATH) {
			switch ($feed->kind()) {
				case FreshRSS_Feed::KIND_HTML_XPATH:
					$outline['type'] = FreshRSS_Export_Service::TYPE_HTML_XPATH;
					break;
				case FreshRSS_Feed::KIND_XML_XPATH:
					$outline['type'] = FreshRSS_Export_Service::TYPE_XML_XPATH;
					break;
			}
			/** @var array<string,string> */
			$xPathSettings = $feed->attributeArray('xpath') ?? [];
			$outline['frss:xPathItem'] = $xPathSettings['item'] ?? null;
			$outline['frss:xPathItemTitle'] = $xPathSettings['itemTitle'] ?? null;
			$outline['frss:xPathItemContent'] = $xPathSettings['itemContent'] ?? null;
			$outline['frss:xPathItemUri'] = $xPathSettings['itemUri'] ?? null;
			$outline['frss:xPathItemAuthor'] = $xPathSettings['itemAuthor'] ?? null;
			$outline['frss:xPathItemTimestamp'] = $xPathSettings['itemTimestamp'] ?? null;
			$outline['frss:xPathItemTimeformat'] = $xPathSettings['itemTimeformat'] ?? null;
			$outline['frss:xPathItemThumbnail'] = $xPathSettings['itemThumbnail'] ?? null;
			$outline['frss:xPathItemCategories'] = $xPathSettings['itemCategories'] ?? null;
			$outline['frss:xPathItemUid'] = $xPathSettings['itemUid'] ?? null;
		}

		if (!empty($feed->filtersAction('read'))) {
			$filters = '';
			foreach ($feed->filtersAction('read') as $filterRead) {
				$filters .= $filterRead->getRawInput() . "\n";
			}
			$filters = trim($filters);
			$outline['frss:filtersActionRead'] = $filters;
		}

		if ($feed->pathEntries() != '') {
			$outline['frss:cssFullContent'] = htmlspecialchars_decode($feed->pathEntries(), ENT_QUOTES);
		}

		if ($feed->attributeString('path_entries_filter') != '') {
			$outline['frss:cssFullContentFilter'] = $feed->attributeString('path_entries_filter');
		}

		// Remove null attributes
		$outline = array_filter($outline, static function (?string $value) { return $value !== null; });

		$outlines[] = $outline;
	}

	return $outlines;
}

/** @var FreshRSS_View $this */

$opml_array = [
	'namespaces' => [
		'frss' => FreshRSS_Export_Service::FRSS_NAMESPACE,
	],
	'head' => [
		'title' => FreshRSS_Context::systemConf()->title,
		'dateCreated' => new DateTime(),
	],
	'body' => [],
];

if (!empty($this->categories)) {
	foreach ($this->categories as $cat) {
		$outline = [
			'text' => htmlspecialchars_decode($cat->name(), ENT_QUOTES),
			'@outlines' => feedsToOutlines($cat->feeds(), $this->excludeMutedFeeds),
		];

		if ($cat->kind() === FreshRSS_Category::KIND_DYNAMIC_OPML) {
			$outline['frss:opmlUrl'] = $cat->attributeString('opml_url');
		}

		$opml_array['body'][] = $outline;
	}
}

if (!empty($this->feeds)) {
	$opml_array['body'] = array_merge($opml_array['body'], feedsToOutlines($this->feeds, $this->excludeMutedFeeds));
}

$libopml = new \marienfressinaud\LibOpml\LibOpml(true);
$opml = $libopml->render($opml_array);
/** @var string $opml */
echo $opml;