<?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)
        $formatFactory = new FormatFactory();

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

        foreach ($formatFactory->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 = $formatFactory->create($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;
    }
}