<?php

include_once("pkgbasefuncs.inc.php");

/**
 * Determine if the user can delete a specific package comment
 *
 * Only the comment submitter, Trusted Users, and Developers can delete
 * comments. This function is used for the backend side of comment deletion.
 *
 * @param string $comment_id The comment ID in the database
 *
 * @return bool True if the user can delete the comment, otherwise false
 */
function can_delete_comment($comment_id=0) {
	$dbh = DB::connect();

	$q = "SELECT UsersID FROM PackageComments ";
	$q.= "WHERE ID = " . intval($comment_id);
	$result = $dbh->query($q);

	if (!$result) {
		return false;
	}

	$uid = $result->fetch(PDO::FETCH_COLUMN, 0);

	return has_credential(CRED_COMMENT_DELETE, array($uid));
}

/**
 * Determine if the user can delete a specific package comment using an array
 *
 * Only the comment submitter, Trusted Users, and Developers can delete
 * comments. This function is used for the frontend side of comment deletion.
 *
 * @param array $comment All database information relating a specific comment
 *
 * @return bool True if the user can delete the comment, otherwise false
 */
function can_delete_comment_array($comment) {
	return has_credential(CRED_COMMENT_DELETE, array($comment['UsersID']));
}

/**
 * Determine if the user can edit a specific package comment
 *
 * Only the comment submitter, Trusted Users, and Developers can edit
 * comments. This function is used for the backend side of comment editing.
 *
 * @param string $comment_id The comment ID in the database
 *
 * @return bool True if the user can edit the comment, otherwise false
 */
function can_edit_comment($comment_id=0) {
	$dbh = DB::connect();

	$q = "SELECT UsersID FROM PackageComments ";
	$q.= "WHERE ID = " . intval($comment_id);
	$result = $dbh->query($q);

	if (!$result) {
		return false;
	}

	$uid = $result->fetch(PDO::FETCH_COLUMN, 0);

	return has_credential(CRED_COMMENT_EDIT, array($uid));
}

/**
 * Determine if the user can edit a specific package comment using an array
 *
 * Only the comment submitter, Trusted Users, and Developers can edit
 * comments. This function is used for the frontend side of comment editing.
 *
 * @param array $comment All database information relating a specific comment
 *
 * @return bool True if the user can edit the comment, otherwise false
 */
function can_edit_comment_array($comment) {
	return has_credential(CRED_COMMENT_EDIT, array($comment['UsersID']));
}

/**
 * Check to see if the package name already exists in the database
 *
 * @param string $name The package name to check
 *
 * @return string|void Package name if it already exists
 */
function pkg_from_name($name="") {
	if (!$name) {return NULL;}
	$dbh = DB::connect();
	$q = "SELECT ID FROM Packages ";
	$q.= "WHERE Name = " . $dbh->quote($name);
	$result = $dbh->query($q);
	if (!$result) {
		return;
	}
	$row = $result->fetch(PDO::FETCH_NUM);
	return $row[0];
}

/**
 * Get licenses for a specific package
 *
 * @param int $pkgid The package to get licenses for
 *
 * @return array All licenses for the package
 */
function pkg_licenses($pkgid) {
	$lics = array();
	$pkgid = intval($pkgid);
	if ($pkgid > 0) {
		$dbh = DB::connect();
		$q = "SELECT l.Name FROM Licenses l ";
		$q.= "INNER JOIN PackageLicenses pl ON pl.LicenseID = l.ID ";
		$q.= "WHERE pl.PackageID = ". $pkgid;
		$result = $dbh->query($q);
		if (!$result) {
			return array();
		}
		while ($row = $result->fetch(PDO::FETCH_COLUMN, 0)) {
			$lics[] = $row;
		}
	}
	return $lics;
}

/**
 * Get package groups for a specific package
 *
 * @param int $pkgid The package to get groups for
 *
 * @return array All package groups for the package
 */
function pkg_groups($pkgid) {
	$grps = array();
	$pkgid = intval($pkgid);
	if ($pkgid > 0) {
		$dbh = DB::connect();
		$q = "SELECT g.Name FROM Groups g ";
		$q.= "INNER JOIN PackageGroups pg ON pg.GroupID = g.ID ";
		$q.= "WHERE pg.PackageID = ". $pkgid;
		$result = $dbh->query($q);
		if (!$result) {
			return array();
		}
		while ($row = $result->fetch(PDO::FETCH_COLUMN, 0)) {
			$grps[] = $row;
		}
	}
	return $grps;
}

/**
 * Get providers for a specific package
 *
 * @param string $name The name of the "package" to get providers for
 *
 * @return array The IDs and names of all providers of the package
 */
function pkg_providers($name) {
	$dbh = DB::connect();
	$q = "SELECT p.ID, p.Name FROM Packages p ";
	$q.= "INNER JOIN PackageRelations pr ON pr.PackageID = p.ID ";
	$q.= "INNER JOIN RelationTypes rt ON rt.ID = pr.RelTypeID ";
	$q.= "WHERE rt.Name = 'provides' ";
	$q.= "AND pr.RelName = " . $dbh->quote($name);
	$result = $dbh->query($q);

	if (!$result) {
		return array();
	}

	$providers = array();
	while ($row = $result->fetch(PDO::FETCH_NUM)) {
		$providers[] = $row;
	}
	return $providers;
}

/**
 * Get package dependencies for a specific package
 *
 * @param int $pkgid The package to get dependencies for
 *
 * @return array All package dependencies for the package
 */
function pkg_dependencies($pkgid) {
	$deps = array();
	$pkgid = intval($pkgid);
	if ($pkgid > 0) {
		$dbh = DB::connect();
		$q = "SELECT pd.DepName, dt.Name, pd.DepCondition, pd.DepArch, p.ID FROM PackageDepends pd ";
		$q.= "LEFT JOIN Packages p ON pd.DepName = p.Name ";
		$q.= "OR SUBSTRING(pd.DepName FROM 1 FOR POSITION(': ' IN pd.DepName) - 1) = p.Name ";
		$q.= "LEFT JOIN DependencyTypes dt ON dt.ID = pd.DepTypeID ";
		$q.= "WHERE pd.PackageID = ". $pkgid . " ";
		$q.= "ORDER BY pd.DepName";
		$result = $dbh->query($q);
		if (!$result) {
			return array();
		}
		while ($row = $result->fetch(PDO::FETCH_NUM)) {
			$deps[] = $row;
		}
	}
	return $deps;
}

/**
 * Get package relations for a specific package
 *
 * @param int $pkgid The package to get relations for
 *
 * @return array All package relations for the package
 */
function pkg_relations($pkgid) {
	$rels = array();
	$pkgid = intval($pkgid);
	if ($pkgid > 0) {
		$dbh = DB::connect();
		$q = "SELECT pr.RelName, rt.Name, pr.RelCondition, pr.RelArch, p.ID FROM PackageRelations pr ";
		$q.= "LEFT JOIN Packages p ON pr.RelName = p.Name ";
		$q.= "LEFT JOIN RelationTypes rt ON rt.ID = pr.RelTypeID ";
		$q.= "WHERE pr.PackageID = ". $pkgid . " ";
		$q.= "ORDER BY pr.RelName";
		$result = $dbh->query($q);
		if (!$result) {
			return array();
		}
		while ($row = $result->fetch(PDO::FETCH_NUM)) {
			$rels[] = $row;
		}
	}
	return $rels;
}

/**
 * Get the HTML code to display a package dependency link annotation
 * (dependency type, architecture, ...)
 *
 * @param string $type The name of the dependency type
 * @param string $arch The package dependency architecture
 * @param string $desc An optdepends description
 *
 * @return string The HTML code of the label to display
 */
function pkg_deplink_annotation($type, $arch, $desc=false) {
	if ($type == 'depends' && !$arch) {
		return '';
	}

	$link = ' <em>(';

	if ($type == 'makedepends') {
		$link .= 'make';
	} elseif ($type == 'checkdepends') {
		$link .= 'check';
	} elseif ($type == 'optdepends') {
		$link .= 'optional';
	}

	if ($type != 'depends' && $arch) {
		$link .= ', ';
	}

	if ($arch) {
		$link .= htmlspecialchars($arch);
	}

	$link .= ')';
	if ($type == 'optdepends' && $desc) {
		$link .= ' &ndash; ' . htmlspecialchars($desc) . ' </em>';
	}
	$link .= '</em>';

	return $link;
}

/**
 * Get the HTML code to display a package dependency link
 *
 * @param string $name The name of the dependency
 * @param string $type The name of the dependency type
 * @param string $cond The package dependency condition string
 * @param string $arch The package dependency architecture
 * @param int $pkg_id The package of the package to display the dependency for
 *
 * @return string The HTML code of the label to display
 */
function pkg_depend_link($name, $type, $cond, $arch, $pkg_id) {
	if ($type == 'optdepends' && strpos($name, ':') !== false) {
		$tokens = explode(':', $name, 2);
		$name = $tokens[0];
		$desc = $tokens[1];
	} else {
		$desc = '(unknown)';
	}

	$providers = array();
	if (is_null($pkg_id)) {
		/*
		 * TODO: We currently perform one SQL query per nonexistent
		 * package dependency. It would be much better if we could
		 * annotate dependency data with providers so that we already
		 * know whether a dependency is a "provision name" or a package
		 * from the official repositories at this point.
		 */
		$providers = pkg_providers($name);
	}

	if (count($providers) > 0) {
		$link = htmlspecialchars($name) . ' ';
		$link .= '<span class="virtual-dep">(';
		foreach ($providers as $provider) {
			$name = $provider[1];
			$link .= '<a href="';
			$link .= htmlspecialchars(get_pkg_uri($name), ENT_QUOTES);
			$link .= '" title="' . __('View packages details for') .' ' . htmlspecialchars($name) . '">';
			$link .= htmlspecialchars($name) . '</a>, ';
		}
		$link = substr($link, 0, -2);
		$link .= ')</span>';
	} else {
		$link = '<a href="';
		if (is_null($pkg_id)) {
			$link .= 'https://www.archlinux.org/packages/?q=' . urlencode($name);
		} else {
			$link .= htmlspecialchars(get_pkg_uri($name), ENT_QUOTES);
		}
		$link .= '" title="' . __('View packages details for') .' ' . htmlspecialchars($name) . '">';
		$link .= htmlspecialchars($name) . '</a>';
		$link .= htmlspecialchars($cond);
	}

	return $link . pkg_deplink_annotation($type, $arch, $desc);
}

/**
 * Get the HTML code to display a package requirement link
 *
 * @param string $name The name of the requirement
 * @param string $type The name of the dependency type
 * @param string $arch The package dependency architecture
 *
 * @return string The HTML code of the link to display
 */
function pkg_requiredby_link($name, $type, $arch) {
	if ($type == 'optdepends' && strpos($name, ':') !== false) {
		$tokens = explode(':', $name, 2);
		$name = $tokens[0];
	}

	$link = '<a href="';
	$link .= htmlspecialchars(get_pkg_uri($name), ENT_QUOTES);
	$link .= '" title="' . __('View packages details for') .' ' . htmlspecialchars($name) . '">';
	$link .= htmlspecialchars($name) . '</a>';

	return $link . pkg_deplink_annotation($type, $arch);
}

/**
 * Get the HTML code to display a package relation
 *
 * @param string $name The name of the relation
 * @param string $cond The package relation condition string
 * @param string $arch The package relation architecture
 *
 * @return string The HTML code of the label to display
 */
function pkg_rel_html($name, $cond, $arch) {
	$html = htmlspecialchars($name) . htmlspecialchars($cond);

	if ($arch) {
		$html .= ' <em>(' . htmlspecialchars($arch) . ')</em>';
	}

	return $html;
}

/**
 * Get the HTML code to display a source link
 *
 * @param string $url The URL of the source
 * @param string $arch The source architecture
 *
 * @return string The HTML code of the label to display
 */
function pkg_source_link($url, $arch) {
	$url = explode('::', $url);
	$parsed_url = parse_url($url[0]);

	if (isset($parsed_url['scheme']) || isset($url[1])) {
		$link = '<a href="' .  htmlspecialchars((isset($url[1]) ? $url[1] : $url[0]), ENT_QUOTES) . '">' . htmlspecialchars($url[0]) . '</a>';
	} else {
		$link = htmlspecialchars($url[0]);
	}

	if ($arch) {
		$link .= ' <em>(' . htmlspecialchars($arch) . ')</em>';
	}

	return $link;
}

/**
 * Determine packages that depend on a package
 *
 * @param string $name The package name for the dependency search
 *
 * @return array All packages that depend on the specified package name
 */
function pkg_required($name="") {
	$deps = array();
	if ($name != "") {
		$dbh = DB::connect();
		$q = "SELECT p.Name, dt.Name, pd.DepArch FROM PackageDepends pd ";
		$q.= "LEFT JOIN Packages p ON p.ID = pd.PackageID ";
		$q.= "LEFT JOIN DependencyTypes dt ON dt.ID = pd.DepTypeID ";
		$q.= "WHERE pd.DepName = " . $dbh->quote($name) . " ";
		$q.= "OR SUBSTRING(pd.DepName FROM 1 FOR POSITION(': ' IN pd.DepName) - 1) = " . $dbh->quote($name) . " ";
		$q.= "ORDER BY p.Name";
		$result = $dbh->query($q);
		if (!$result) {return array();}
		while ($row = $result->fetch(PDO::FETCH_NUM)) {
			$deps[] = $row;
		}
	}
	return $deps;
}

/**
 * Get all package sources for a specific package
 *
 * @param string $pkgid The package ID to get the sources for
 *
 * @return array All sources associated with a specific package
 */
function pkg_sources($pkgid) {
	$sources = array();
	$pkgid = intval($pkgid);
	if ($pkgid > 0) {
		$dbh = DB::connect();
		$q = "SELECT Source, SourceArch FROM PackageSources ";
		$q.= "WHERE PackageID = " . $pkgid;
		$q.= " ORDER BY Source";
		$result = $dbh->query($q);
		if (!$result) {
			return array();
		}
		while ($row = $result->fetch(PDO::FETCH_NUM)) {
			$sources[] = $row;
		}
	}
	return $sources;
}

/**
 * Determine package names from package IDs
 *
 * @param string|array $pkgids The package IDs to get names for
 *
 * @return array|string All names if multiple package IDs, otherwise package name
 */
function pkg_name_from_id($pkgids) {
	if (is_array($pkgids)) {
		$pkgids = sanitize_ids($pkgids);
		$names = array();
		$dbh = DB::connect();
		$q = "SELECT Name FROM Packages WHERE ID IN (";
		$q.= implode(",", $pkgids) . ")";
		$result = $dbh->query($q);
		if ($result) {
			while ($row = $result->fetch(PDO::FETCH_ASSOC)) {
				$names[] = $row['Name'];
			}
		}
		return $names;
	}
	elseif ($pkgids > 0) {
		$dbh = DB::connect();
		$q = "SELECT Name FROM Packages WHERE ID = " . $pkgids;
		$result = $dbh->query($q);
		if ($result) {
			$name = $result->fetch(PDO::FETCH_NUM);
		}
		return $name[0];
	}
	else {
		return NULL;
	}
}

/**
 * Determine if a package name is on the database blacklist
 *
 * @param string $name The package name to check
 *
 * @return bool True if the name is blacklisted, otherwise false
 */
function pkg_name_is_blacklisted($name) {
	$dbh = DB::connect();
	$q = "SELECT COUNT(*) FROM PackageBlacklist ";
	$q.= "WHERE Name = " . $dbh->quote($name);
	$result = $dbh->query($q);

	if (!$result) return false;
	return ($result->fetchColumn() > 0);
}

/**
 * Get the package details
 *
 * @param string $id The package ID to get description for
 *
 * @return array The package's details OR error message
 **/
function pkg_get_details($id=0) {
	$dbh = DB::connect();

	$q = "SELECT Packages.*, PackageBases.ID AS BaseID, ";
	$q.= "PackageBases.Name AS BaseName, PackageBases.NumVotes, ";
	$q.= "PackageBases.Popularity, PackageBases.OutOfDateTS, ";
	$q.= "PackageBases.SubmittedTS, PackageBases.ModifiedTS, ";
	$q.= "PackageBases.SubmitterUID, PackageBases.MaintainerUID, ";
	$q.= "PackageBases.PackagerUID, PackageBases.FlaggerUID, ";
	$q.= "(SELECT COUNT(*) FROM PackageRequests ";
	$q.= " WHERE PackageRequests.PackageBaseID = Packages.PackageBaseID ";
	$q.= " AND PackageRequests.Status = 0) AS RequestCount ";
	$q.= "FROM Packages, PackageBases ";
	$q.= "WHERE PackageBases.ID = Packages.PackageBaseID ";
	$q.= "AND Packages.ID = " . intval($id);
	$result = $dbh->query($q);

	$row = array();

	if (!$result) {
		$row['error'] = __("Error retrieving package details.");
	}
	else {
		$row = $result->fetch(PDO::FETCH_ASSOC);
		if (empty($row)) {
			$row['error'] = __("Package details could not be found.");
		}
	}

	return $row;
}

/**
 * Display the package details page
 *
 * @param string $id The package ID to get details page for
 * @param array $row Package details retrieved by pkg_get_details()
 * @param string $SID The session ID of the visitor
 *
 * @return void
 */
function pkg_display_details($id=0, $row, $SID="") {
	$dbh = DB::connect();

	if (isset($row['error'])) {
		print "<p>" . $row['error'] . "</p>\n";
	}
	else {
		$base_id = pkgbase_from_pkgid($id);
		$pkgbase_name = pkgbase_name_from_id($base_id);

		include('pkg_details.php');

		if ($SID) {
			include('pkg_comment_box.php');
		}

		$limit = isset($_GET['comments']) ? 0 : 10;
		$include_deleted = has_credential(CRED_COMMENT_VIEW_DELETED);
		$comments = pkgbase_comments($base_id, $limit, $include_deleted);
		if (!empty($comments)) {
			include('pkg_comments.php');
		}
	}
}

/* pkg_search_page(SID)
 * outputs the body of search/search results page
 *
 * parameters:
 *  SID - current Session ID
 * preconditions:
 *  package search page has been accessed
 *  request variables have not been sanitized
 *
 *  request vars:
 *    O  - starting result number
 *    PP - number of search hits per page
 *    K  - package search string
 *    SO - search hit sort order:
 *          values: a - ascending
 *                  d - descending
 *    SB - sort search hits by:
 *          values: n - package name
 *                  v - number of votes
 *                  m - maintainer username
 *    SeB- property that search string (K) represents
 *          values: n  - package name
 *                  nd - package name & description
 *                  x  - package name (exact match)
 *                  m  - package maintainer's username
 *                  s  - package submitter's username
 *    do_Orphans    - boolean. whether to search packages
 *                     without a maintainer
 *
 *
 *    These two are actually handled in packages.php.
 *
 *    IDs- integer array of ticked packages' IDs
 *    action - action to be taken on ticked packages
 *             values: do_Flag   - Flag out-of-date
 *                     do_UnFlag - Remove out-of-date flag
 *                     do_Adopt  - Adopt
 *                     do_Disown - Disown
 *                     do_Delete - Delete
 *                     do_Notify - Enable notification
 *                     do_UnNotify - Disable notification
 */
function pkg_search_page($SID="") {
	$dbh = DB::connect();

	/*
	 * Get commonly used variables.
	 * TODO: Reduce the number of database queries!
	 */
	if ($SID)
		$myuid = uid_from_sid($SID);

	/* Sanitize paging variables. */
	if (isset($_GET['O'])) {
		$_GET['O'] = max(intval($_GET['O']), 0);
	} else {
		$_GET['O'] = 0;
	}

	if (isset($_GET["PP"])) {
		$_GET["PP"] = bound(intval($_GET["PP"]), 50, 250);
	} else {
		$_GET["PP"] = 50;
	}

	/*
	 * FIXME: Pull out DB-related code. All of it! This one's worth a
	 * choco-chip cookie, one of those nice big soft ones.
	 */

	/* Build the package search query. */
	$q_select = "SELECT ";
	if ($SID) {
		$q_select .= "CommentNotify.UserID AS Notify,
			   PackageVotes.UsersID AS Voted, ";
	}
	$q_select .= "Users.Username AS Maintainer,
	Packages.Name, Packages.Version, Packages.Description,
	PackageBases.NumVotes, PackageBases.Popularity, Packages.ID,
	Packages.PackageBaseID, PackageBases.OutOfDateTS ";

	$q_from = "FROM Packages
	LEFT JOIN PackageBases ON (PackageBases.ID = Packages.PackageBaseID)
	LEFT JOIN Users ON (PackageBases.MaintainerUID = Users.ID) ";
	if ($SID) {
		/* This is not needed for the total row count query. */
		$q_from_extra = "LEFT JOIN PackageVotes
		ON (PackageBases.ID = PackageVotes.PackageBaseID AND PackageVotes.UsersID = $myuid)
		LEFT JOIN CommentNotify
		ON (PackageBases.ID = CommentNotify.PackageBaseID AND CommentNotify.UserID = $myuid) ";
	} else {
		$q_from_extra = "";
	}

	$q_where = 'WHERE PackageBases.PackagerUID IS NOT NULL ';

	if (isset($_GET['K'])) {
		if (isset($_GET["SeB"]) && $_GET["SeB"] == "m") {
			/* Search by maintainer. */
			$q_where .= "AND Users.Username = " . $dbh->quote($_GET['K']) . " ";
		}
		elseif (isset($_GET["SeB"]) && $_GET["SeB"] == "s") {
			/* Search by submitter. */
			$q_where .= "AND SubmitterUID = " . intval(uid_from_username($_GET['K'])) . " ";
		}
		elseif (isset($_GET["SeB"]) && $_GET["SeB"] == "n") {
			/* Search by name. */
			$K = "%" . addcslashes($_GET['K'], '%_') . "%";
			$q_where .= "AND (Packages.Name LIKE " . $dbh->quote($K) . ") ";
		}
		elseif (isset($_GET["SeB"]) && $_GET["SeB"] == "b") {
			/* Search by package base name. */
			$K = "%" . addcslashes($_GET['K'], '%_') . "%";
			$q_where .= "AND (PackageBases.Name LIKE " . $dbh->quote($K) . ") ";
		}
		elseif (isset($_GET["SeB"]) && $_GET["SeB"] == "N") {
			/* Search by name (exact match). */
			$q_where .= "AND (Packages.Name = " . $dbh->quote($_GET['K']) . ") ";
		}
		elseif (isset($_GET["SeB"]) && $_GET["SeB"] == "B") {
			/* Search by package base name (exact match). */
			$q_where .= "AND (PackageBases.Name = " . $dbh->quote($_GET['K']) . ") ";
		}
		else {
			/* Keyword search (default). */
			$count = 0;
			$q_keywords = "";
			$op = "";

			foreach (str_getcsv($_GET['K'], ' ') as $term) {
				if ($term == "") {
					continue;
				}
				if ($count > 0 && strtolower($term) == "and") {
					$op = "AND ";
					continue;
				}
				if ($count > 0 && strtolower($term) == "or") {
					$op = "OR ";
					continue;
				}
			        if ($count > 0 && strtolower($term) == "not") {
					$op .= "NOT ";
					continue;
				}

				$term = "%" . addcslashes($term, '%_') . "%";
				$q_keywords .= $op . " (Packages.Name LIKE " . $dbh->quote($term) . " OR ";
				$q_keywords .= "Description LIKE " . $dbh->quote($term) . " OR ";
				$q_keywords .= "EXISTS (SELECT * FROM PackageKeywords WHERE ";
				$q_keywords .= "PackageKeywords.PackageBaseID = Packages.PackageBaseID AND ";
				$q_keywords .= "PackageKeywords.Keyword LIKE " . $dbh->quote($term) . ")) ";

				$count++;
				if ($count >= 20) {
					break;
				}
				$op = "AND ";
			}

			if (!empty($q_keywords)) {
				$q_where .= "AND (" . $q_keywords . ") ";
			}
		}
	}

	if (isset($_GET["do_Orphans"])) {
		$q_where .= "AND MaintainerUID IS NULL ";
	}

	if (isset($_GET['outdated'])) {
		if ($_GET['outdated'] == 'on') {
			$q_where .= "AND OutOfDateTS IS NOT NULL ";
		}
		elseif ($_GET['outdated'] == 'off') {
			$q_where .= "AND OutOfDateTS IS NULL ";
		}
	}

	$order = (isset($_GET["SO"]) && $_GET["SO"] == 'd') ? 'DESC' : 'ASC';

	$q_sort = "ORDER BY ";
	$sort_by = isset($_GET["SB"]) ? $_GET["SB"] : '';
	switch ($sort_by) {
	case 'v':
		$q_sort .= "NumVotes " . $order . ", ";
		break;
	case 'p':
		$q_sort .= "Popularity " . $order . ", ";
		break;
	case 'w':
		if ($SID) {
			$q_sort .= "Voted " . $order . ", ";
		}
		break;
	case 'o':
		if ($SID) {
			$q_sort .= "Notify " . $order . ", ";
		}
		break;
	case 'm':
		$q_sort .= "Maintainer " . $order . ", ";
		break;
	case 'a':
		$q_sort .= "-ModifiedTS " . $order . ", ";
		break;
	default:
		break;
	}
	$q_sort .= " Packages.Name " . $order . " ";

	$q_limit = "LIMIT ".$_GET["PP"]." OFFSET ".$_GET["O"];

	$q = $q_select . $q_from . $q_from_extra . $q_where . $q_sort . $q_limit;
	$q_total = "SELECT COUNT(*) " . $q_from . $q_where;

	$result = $dbh->query($q);
	$result_t = $dbh->query($q_total);
	if ($result_t) {
		$row = $result_t->fetch(PDO::FETCH_NUM);
		$total = $row[0];
	}
	else {
		$total = 0;
	}

	if ($result && $total > 0) {
		if (isset($_GET["SO"]) && $_GET["SO"] == "d"){
			$SO_next = "a";
		}
		else {
			$SO_next = "d";
		}
	}

	/* Calculate the results to use. */
	$first = $_GET['O'] + 1;

	/* Calculation of pagination links. */
	$per_page = ($_GET['PP'] > 0) ? $_GET['PP'] : 50;
	$current = ceil($first / $per_page);
	$pages = ceil($total / $per_page);
	$templ_pages = array();

	if ($current > 1) {
		$templ_pages['&laquo; ' . __('First')] = 0;
		$templ_pages['&lsaquo; ' . __('Previous')] = ($current - 2) * $per_page;
	}

	if ($current - 5 > 1)
		$templ_pages["..."] = false;

	for ($i = max($current - 5, 1); $i <= min($pages, $current + 5); $i++) {
		$templ_pages[$i] = ($i - 1) * $per_page;
	}

	if ($current + 5 < $pages)
		$templ_pages["... "] = false;

	if ($current < $pages) {
		$templ_pages[__('Next') . ' &rsaquo;'] = $current * $per_page;
		$templ_pages[__('Last') . ' &raquo;'] = ($pages - 1) * $per_page;
	}

	include('pkg_search_form.php');

	if ($result) {
		while ($row = $result->fetch(PDO::FETCH_ASSOC)) {
			$searchresults[] = $row;
		}
	}

	include('pkg_search_results.php');

	return;
}

/**
 * Determine if a POST string has been sent by a visitor
 *
 * @param string $action String to check has been sent via POST
 *
 * @return bool True if the POST string was used, otherwise false
 */
function current_action($action) {
	return (isset($_POST['action']) && $_POST['action'] == $action) ||
		isset($_POST[$action]);
}

/**
 * Determine if sent IDs are valid integers
 *
 * @param array $ids IDs to validate
 *
 * @return array All sent IDs that are valid integers
 */
function sanitize_ids($ids) {
	$new_ids = array();
	foreach ($ids as $id) {
		$id = intval($id);
		if ($id > 0) {
			$new_ids[] = $id;
		}
	}
	return $new_ids;
}

/**
 * Add package information to the database for a specific package
 *
 * @param int $base_id ID of the package base
 * @param string $pkgname Name of the new package
 * @param string $pkgver Version of the new package
 * @param string $pkgdesc Description of the new package
 * @param string $pkgurl Upstream URL for the new package
 *
 * @return int ID of the new package
 */
function pkg_create($base_id, $pkgname, $pkgver, $pkgdesc, $pkgurl) {
	$dbh = DB::connect();
	$q = sprintf("INSERT INTO Packages (PackageBaseID, Name, Version, " .
		"Description, URL) VALUES (%d, %s, %s, %s, %s)",
		$base_id, $dbh->quote($pkgname), $dbh->quote($pkgver),
		$dbh->quote($pkgdesc), $dbh->quote($pkgurl));
	$dbh->exec($q);
	return $dbh->lastInsertId();
}

/**
 * Add a dependency for a specific package to the database
 *
 * @param int $pkgid The package ID to add the dependency for
 * @param string $type The type of dependency to add
 * @param string $depname The name of the dependency to add
 * @param string $depcondition The  type of dependency for the package
 * @param string $deparch The architecture of the dependency to add
 *
 * @return void
 */
function pkg_add_dep($pkgid, $type, $depname, $depcondition, $deparch) {
	$dbh = DB::connect();
	$q = sprintf("INSERT INTO PackageDepends (PackageID, DepTypeID, DepName, DepCondition, DepArch) VALUES (%d, %d, %s, %s, %s)",
		$pkgid,
		pkg_dependency_type_id_from_name($type),
		$dbh->quote($depname),
		$dbh->quote($depcondition),
		$deparch ? $dbh->quote($deparch) : 'NULL'
	);
	$dbh->exec($q);
}

/**
 * Add a relation for a specific package to the database
 *
 * @param int $pkgid The package ID to add the relation for
 * @param string $type The type of relation to add
 * @param string $relname The name of the relation to add
 * @param string $relcondition The version requirement of the relation
 * @param string $relarch The architecture of the relation to add
 *
 * @return void
 */
function pkg_add_rel($pkgid, $type, $relname, $relcondition, $relarch) {
	$dbh = DB::connect();
	$q = sprintf("INSERT INTO PackageRelations (PackageID, RelTypeID, RelName, RelCondition, RelArch) VALUES (%d, %d, %s, %s, %s)",
		$pkgid,
		pkg_relation_type_id_from_name($type),
		$dbh->quote($relname),
		$dbh->quote($relcondition),
		$relarch ? $dbh->quote($relarch) : 'NULL'
	);
	$dbh->exec($q);
}

/**
 * Add a source for a specific package to the database
 *
 * @param int $pkgid The package ID to add the source for
 * @param string $pkgsrc The package source to add to the database
 * @param string $srcarch The architecture of the source to add
 *
 * @return void
 */
function pkg_add_src($pkgid, $pkgsrc, $srcarch) {
	$dbh = DB::connect();
	$q = sprintf("INSERT INTO PackageSources (PackageID, Source, SourceArch) VALUES (%d, %s, %s)",
		$pkgid,
		$dbh->quote($pkgsrc),
		$srcarch ? $dbh->quote($srcarch) : 'NULL'
	);
	$dbh->exec($q);
}

/**
 * Creates a new group and returns its ID
 *
 * If the groups already exists, the ID of the already existing group is
 * returned.
 *
 * @param string $name The name of the group to create
 *
 * @return int The ID of the group
 */
function pkg_create_group($name) {
	$dbh = DB::connect();
	$q = sprintf("SELECT ID FROM Groups WHERE Name = %s", $dbh->quote($name));
	$result = $dbh->query($q);
	if ($result) {
		$grpid = $result->fetch(PDO::FETCH_COLUMN, 0);
		if ($grpid > 0) {
			return $grpid;
		}
	}

	$q = sprintf("INSERT INTO Groups (Name) VALUES (%s)", $dbh->quote($name));
	$dbh->exec($q);
	return $dbh->lastInsertId();
}

/**
 * Add a package to a group
 *
 * @param int $pkgid The package ID of the package to add
 * @param int $grpid The group ID of the group to add the package to
 *
 * @return void
 */
function pkg_add_grp($pkgid, $grpid) {
	$dbh = DB::connect();
	$q = sprintf("INSERT INTO PackageGroups (PackageID, GroupID) VALUES (%d, %d)",
		$pkgid,
		$grpid
	);
	$dbh->exec($q);
}

/**
 * Creates a new license and returns its ID
 *
 * If the license already exists, the ID of the already existing license is
 * returned.
 *
 * @param string $name The name of the license to create
 *
 * @return int The ID of the license
 */
function pkg_create_license($name) {
	$dbh = DB::connect();
	$q = sprintf("SELECT ID FROM Licenses WHERE Name = %s", $dbh->quote($name));
	$result = $dbh->query($q);
	if ($result) {
		$licid = $result->fetch(PDO::FETCH_COLUMN, 0);
		if ($licid > 0) {
			return $licid;
		}
	}

	$q = sprintf("INSERT INTO Licenses (Name) VALUES (%s)", $dbh->quote($name));
	$dbh->exec($q);
	return $dbh->lastInsertId();
}

/**
 * Add a license to a package
 *
 * @param int $pkgid The package ID of the package
 * @param int $grpid The ID of the license to add
 *
 * @return void
 */
function pkg_add_lic($pkgid, $licid) {
	$dbh = DB::connect();
	$q = sprintf("INSERT INTO PackageLicenses (PackageID, LicenseID) VALUES (%d, %d)",
		$pkgid,
		$licid
	);
	$dbh->exec($q);
}

/**
 * Determine package information for latest package
 *
 * @param int $numpkgs Number of packages to get information on
 *
 * @return array $packages Package info for the specified number of recent packages
 */
function latest_pkgs($numpkgs) {
	$dbh = DB::connect();

	$q = "SELECT Packages.*, MaintainerUID, SubmittedTS ";
	$q.= "FROM Packages LEFT JOIN PackageBases ON ";
	$q.= "PackageBases.ID = Packages.PackageBaseID ";
	$q.= "ORDER BY SubmittedTS DESC ";
	$q.= "LIMIT " . intval($numpkgs);
	$result = $dbh->query($q);

	$packages = array();
	if ($result) {
		while ($row = $result->fetch(PDO::FETCH_ASSOC)) {
			$packages[] = $row;
		}
	}

	return $packages;
}