Gazelle/sections/artist/download.php

<?
//TODO: freeleech in ratio hit calculations, in addition to a warning of whats freeleech in the Summary.txt
/*
This page is something of a hack so those
easily scared off by funky solutions, don't
touch it! :P

There is a central problem to this page, it's
impossible to order before grouping in SQL, and
it's slow to run sub queries, so we had to get
creative for this one.

The solution I settled on abuses the way
$DB->to_array() works. What we've done, is
backwards ordering. The results returned by the
query have the best one for each GroupID last,
and while to_array traverses the results, it
overwrites the keys and leaves us with only the
desired result. This does mean however, that
the SQL has to be done in a somewhat backwards
fashion.

Thats all you get for a disclaimer, just
remember, this page isn't for the faint of
heart. -A9

SQL template:
SELECT
	CASE
		WHEN t.Format = 'MP3' AND t.Encoding = 'V0 (VBR)'
			THEN 1
		WHEN t.Format = 'MP3' AND t.Encoding = 'V2 (VBR)'
			THEN 2
		ELSE 100
	END AS Rank,
	t.GroupID,
	t.Media,
	t.Format,
	t.Encoding,
	IF(t.Year = 0, tg.Year, t.Year),
	tg.Name,
	a.Name,
	t.Size
FROM torrents AS t
	INNER JOIN torrents_group AS tg ON tg.ID = t.GroupID AND tg.CategoryID = '1'
	INNER JOIN artists_group AS a ON a.ArtistID = tg.ArtistID AND a.ArtistID = '59721'
	LEFT JOIN torrents_files AS f ON t.ID = f.TorrentID
ORDER BY t.GroupID ASC, Rank DESC, t.Seeders ASC
*/

if (
	!isset($_REQUEST['artistid'])
	|| !isset($_REQUEST['preference'])
	|| !is_number($_REQUEST['preference'])
	|| !is_number($_REQUEST['artistid'])
	|| $_REQUEST['preference'] > 2
	|| count($_REQUEST['list']) === 0
) {
	error(0);
}

if (!check_perms('zip_downloader')) {
	error(403);
}

$Preferences = array('RemasterTitle DESC', 'Seeders ASC', 'Size ASC');

$ArtistID = $_REQUEST['artistid'];
$Preference = $Preferences[$_REQUEST['preference']];

$DB->query("
	SELECT Name
	FROM artists_group
	WHERE ArtistID = '$ArtistID'");
list($ArtistName) = $DB->next_record(MYSQLI_NUM, false);

$DB->query("
	SELECT GroupID, Importance
	FROM torrents_artists
	WHERE ArtistID = '$ArtistID'");
if (!$DB->has_results()) {
	error(404);
}
$Releases = $DB->to_array('GroupID', MYSQLI_ASSOC, false);
$GroupIDs = array_keys($Releases);

$SQL = 'SELECT CASE ';

foreach ($_REQUEST['list'] as $Priority => $Selection) {
	if (!is_number($Priority)) {
		continue;
	}
	$SQL .= 'WHEN ';
	switch ($Selection) {
		case '00': $SQL .= "t.Format = 'MP3'  AND t.Encoding = 'V0 (VBR)'"; break;
		case '01': $SQL .= "t.Format = 'MP3'  AND t.Encoding = 'APX (VBR)'"; break;
		case '02': $SQL .= "t.Format = 'MP3'  AND t.Encoding = '256 (VBR)'"; break;
		case '03': $SQL .= "t.Format = 'MP3'  AND t.Encoding = 'V1 (VBR)'"; break;
		case '10': $SQL .= "t.Format = 'MP3'  AND t.Encoding = '224 (VBR)'"; break;
		case '11': $SQL .= "t.Format = 'MP3'  AND t.Encoding = 'V2 (VBR)'"; break;
		case '12': $SQL .= "t.Format = 'MP3'  AND t.Encoding = 'APS (VBR)'"; break;
		case '13': $SQL .= "t.Format = 'MP3'  AND t.Encoding = '192 (VBR)'"; break;
		case '20': $SQL .= "t.Format = 'MP3'  AND t.Encoding = '320'"; break;
		case '21': $SQL .= "t.Format = 'MP3'  AND t.Encoding = '256'"; break;
		case '22': $SQL .= "t.Format = 'MP3'  AND t.Encoding = '224'"; break;
		case '23': $SQL .= "t.Format = 'MP3'  AND t.Encoding = '192'"; break;
		case '30': $SQL .= "t.Format = 'FLAC' AND t.Encoding = '24bit Lossless' AND t.Media = 'Vinyl'"; break;
		case '31': $SQL .= "t.Format = 'FLAC' AND t.Encoding = '24bit Lossless' AND t.Media = 'DVD'"; break;
		case '32': $SQL .= "t.Format = 'FLAC' AND t.Encoding = '24bit Lossless' AND t.Media = 'SACD'"; break;
		case '33': $SQL .= "t.Format = 'FLAC' AND t.Encoding = '24bit Lossless' AND t.Media = 'WEB'"; break;
		case '34': $SQL .= "t.Format = 'FLAC' AND t.Encoding = 'Lossless' AND HasLog = '1' AND LogScore = '100' AND HasCue = '1'"; break;
		case '35': $SQL .= "t.Format = 'FLAC' AND t.Encoding = 'Lossless' AND HasLog = '1' AND LogScore = '100'"; break;
		case '36': $SQL .= "t.Format = 'FLAC' AND t.Encoding = 'Lossless' AND HasLog = '1'"; break;
		case '37': $SQL .= "t.Format = 'FLAC' AND t.Encoding = 'Lossless'"; break;
		case '40': $SQL .= "t.Format = 'DTS'"; break;
		case '42': $SQL .= "t.Format = 'AAC'  AND t.Encoding = '320'"; break;
		case '43': $SQL .= "t.Format = 'AAC'  AND t.Encoding = '256'"; break;
		case '44': $SQL .= "t.Format = 'AAC'  AND t.Encoding = 'q5.5'"; break;
		case '45': $SQL .= "t.Format = 'AAC'  AND t.Encoding = 'q5'"; break;
		case '46': $SQL .= "t.Format = 'AAC'  AND t.Encoding = '192'"; break;
		default: error(0);
	}
	$SQL .= " THEN $Priority ";
}
$SQL .= "
		ELSE 100
	END AS Rank,
	t.GroupID,
	t.ID AS TorrentID,
	t.Media,
	t.Format,
	t.Encoding,
	tg.ReleaseType,
	IF(t.RemasterYear = 0, tg.Year, t.RemasterYear) AS Year,
	tg.Name,
	t.Size
FROM torrents AS t
	JOIN torrents_group AS tg ON tg.ID = t.GroupID AND tg.CategoryID = '1' AND tg.ID IN (".implode(',', $GroupIDs).")
ORDER BY t.GroupID ASC, Rank DESC, t.$Preference";

$DownloadsQ = $DB->query($SQL);
$Collector = new TorrentsDL($DownloadsQ, $ArtistName);
while (list($Downloads, $GroupIDs) = $Collector->get_downloads('GroupID')) {
	$Artists = Artists::get_artists($GroupIDs);
	$TorrentFilesQ = $DB->query("
		SELECT TorrentID, File
		FROM torrents_files
		WHERE TorrentID IN (".implode(',', array_keys($GroupIDs)).')', false);
	if (is_int($TorrentFilesQ)) {
		// Query failed. Let's not create a broken zip archive
		foreach ($GroupIDs as $GroupID) {
			$Download =& $Downloads[$GroupID];
			$Download['Artist'] = Artists::display_artists($Artists[$GroupID], false, true, false);
			$Collector->fail_file($Download);
		}
		continue;
	}
	while (list($TorrentID, $TorrentFile) = $DB->next_record(MYSQLI_NUM, false)) {
		$GroupID = $GroupIDs[$TorrentID];
		$Download =& $Downloads[$GroupID];
		$Download['Artist'] = Artists::display_artists($Artists[$Download['GroupID']], false, true, false);
		if ($Download['Rank'] == 100) {
			$Collector->skip_file($Download);
			continue;
		}
		if ($Releases[$GroupID]['Importance'] == 1) {
			$ReleaseTypeName = $ReleaseTypes[$Download['ReleaseType']];
		} elseif ($Releases[$GroupID]['Importance'] == 2) {
			$ReleaseTypeName = 'Guest Appearance';
		} elseif ($Releases[$GroupID]['Importance'] == 3) {
			$ReleaseTypeName = 'Remixed By';
		}
		$Collector->add_file($TorrentFile, $Download, $ReleaseTypeName);
		unset($Download);
	}
}
$Collector->finalize();
$Settings = array(implode(':', $_REQUEST['list']), $_REQUEST['preference']);
if (!isset($LoggedUser['Collector']) || $LoggedUser['Collector'] != $Settings) {
	Users::update_site_options($LoggedUser['ID'], array('Collector' => $Settings));
}

define('SKIP_NO_CACHE_HEADERS', 1);
?>