<?php
class HtmlFormat extends FormatAbstract {
	const MIME_TYPE = 'text/html';

	public function stringify(){
		$extraInfos = $this->getExtraInfos();
		$title = htmlspecialchars($extraInfos['name']);
		$uri = htmlspecialchars($extraInfos['uri']);
		$donationUri = htmlspecialchars($extraInfos['donationUri']);
		$donationsAllowed = Configuration::getConfig('admin', 'donations');

		// Dynamically build buttons for all formats (except HTML)
		$formatFac = new FormatFactory();

		$buttons = '';
		$links = '';

		foreach($formatFac->getFormatNames() as $format) {
			if(strcasecmp($format, 'HTML') === 0) {
				continue;
			}

			$query = str_ireplace('format=Html', 'format=' . $format, htmlentities($_SERVER['QUERY_STRING']));
			$buttons .= $this->buildButton($format, $query) . PHP_EOL;

			$mime = $formatFac->create($format)->getMimeType();
			$links .= $this->buildLink($format, $query, $mime) . PHP_EOL;
		}

		if($donationUri !== '' && $donationsAllowed) {
			$buttons .= '<a href="'
						. $donationUri
						. '" target="_blank"><button class="highlight">Donate to maintainer</button></a>'
						. PHP_EOL;
			$links .= '<link href="'
						. $donationUri
						. ' target="_blank"" title="Donate to Maintainer" rel="alternate">'
						. PHP_EOL;
		}

		$entries = '';
		foreach($this->getItems() as $item) {
			$entryAuthor = $item->getAuthor() ? '<br /><p class="author">by: ' . $item->getAuthor() . '</p>' : '';
			$entryTitle = $this->sanitizeHtml(strip_tags($item->getTitle()));
			$entryUri = $item->getURI() ?: $uri;

			$entryDate = '';
			if($item->getTimestamp()) {

				$entryDate = sprintf(
					'<time datetime="%s">%s</time>',
					date('Y-m-d H:i:s', $item->getTimestamp()),
					date('Y-m-d H:i:s', $item->getTimestamp())
				);
			}

			$entryContent = '';
			if($item->getContent()) {
				$entryContent = '<div class="content">'
				. $this->sanitizeHtml($item->getContent())
				. '</div>';
			}

			$entryEnclosures = '';
			if(!empty($item->getEnclosures())) {
				$entryEnclosures = '<div class="attachments"><p>Attachments:</p>';

				foreach($item->getEnclosures() as $enclosure) {
					$template = '<li class="enclosure"><a href="%s" rel="noopener noreferrer nofollow">%s</a></li>';
					$url = $this->sanitizeHtml($enclosure);
					$anchorText = substr($url, strrpos($url, '/') + 1);

					$entryEnclosures .= sprintf($template, $url, $anchorText);
				}

				$entryEnclosures .= '</div>';
			}

			$entryCategories = '';
			if(!empty($item->getCategories())) {
				$entryCategories = '<div class="categories"><p>Categories:</p>';

				foreach($item->getCategories() as $category) {

					$entryCategories .= '<li class="category">'
					. $this->sanitizeHtml($category)
					. '</li>';
				}

				$entryCategories .= '</div>';
			}

			$entries .= <<<EOD

<section class="feeditem">
	<h2><a class="itemtitle" href="{$entryUri}">{$entryTitle}</a></h2>
	{$entryDate}
	{$entryAuthor}
	{$entryContent}
	{$entryEnclosures}
	{$entryCategories}
</section>

EOD;
		}

		$charset = $this->getCharset();

		/* Data are prepared, now let's begin the "MAGIE !!!" */
		$toReturn = <<<EOD
<!DOCTYPE html>
<html>
<head>
	<meta charset="{$charset}">
	<meta name="viewport" content="width=device-width, initial-scale=1.0" />
	<title>{$title}</title>
	<link href="static/HtmlFormat.css" rel="stylesheet">
	<link rel="icon" type="image/png" href="static/favicon.png">
	{$links}
	<meta name="robots" content="noindex, follow">
</head>
<body>
	<h1 class="pagetitle"><a href="{$uri}" target="_blank">{$title}</a></h1>
	<div class="buttons">
		<a href="./#bridge-{$_GET['bridge']}"><button class="backbutton">← back to rss-bridge</button></a>
		{$buttons}
	</div>
{$entries}
</body>
</html>
EOD;

		// Remove invalid characters
		ini_set('mbstring.substitute_character', 'none');
		$toReturn = mb_convert_encoding($toReturn, $this->getCharset(), 'UTF-8');
		return $toReturn;
	}

	private function buildButton($format, $query) {
		return <<<EOD
<a href="./?{$query}"><button class="rss-feed">{$format}</button></a>
EOD;
	}

	private function buildLink($format, $query, $mime) {
		return <<<EOD
<link href="./?{$query}" title="{$format}" rel="alternate" type="{$mime}">

EOD;
	}
}
