<?php
/* vim:set tabstop=8 softtabstop=8 shiftwidth=8 noexpandtab: */
/**
 * Stats Class
 *
 * PHP version 5
 *
 * LICENSE: GNU General Public License, version 2 (GPLv2)
 * Copyright (c) 2001 - 2011 Ampache.org All Rights Reserved
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License v2
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * @category	Stats
 * @package	Ampache
 * @author	Karl Vollmer <vollmer@ampache.org>
 * @copyright	2001 - 2011 Ampache.org
 * @license	http://opensource.org/licenses/gpl-2.0 GPLv2
 * @version	PHP 5.2
 * @link	http://www.ampache.org/
 * @since	File available since Release 1.0
 */

/**
 * Stats Class
 *
 * this class handles the object_count
 * Stuff, before this was done in the user class
 * but that's not good, all done through here.
 *
 * @category	Stats
 * @package	Ampache
 * @author	Karl Vollmer <vollmer@ampache.org>
 * @copyright	2001 - 2011 Ampache.org
 * @license	http://opensource.org/licenses/gpl-2.0 GPLv2
 * @version	Release: 3.6
 * @link	http://www.ampache.org/
 * @since	Class available since Release 1.0
 */
class Stats {

	/* Base vars */
	var $id;
	var $object_type;
	var $object_id;
	var $date;
	var $user;


	/**
 	 * Constructor
	 * This doesn't do anything currently
	 */
	public function __construct() {

		return true;

	} // Constructor

	/**
 	 * insert
	 * This inserts a new record for the specified object
	 * with the specified information, amazing!
	 */
	public static function insert($type,$oid,$user) {

		$type 	= self::validate_type($type);
		$oid	= Dba::escape($oid);
		$user	= Dba::escape($user);
		$date	= time();

		$sql = "INSERT INTO `object_count` (`object_type`,`object_id`,`date`,`user`) " .
			" VALUES ('$type','$oid','$date','$user')";
		$db_results = Dba::write($sql);

		if (!$db_results) {
			debug_event('statistics','Unabled to insert statistics:' . $sql,'3');
		}

	} // insert

	/**
	 * get_last_song
	 * This returns the full data for the last song that was played, including when it
	 * was played, this is used by, among other things, the LastFM plugin to figure out
	 * if we should re-submit or if this is a duplicate / if it's too soon. This takes an
	 * optional user_id because when streaming we don't have $GLOBALS()
	 */
	public static function get_last_song($user_id='') {

		$user_id = $user_id ? $user_id : $GLOBALS['user']->id;

		$user_id = Dba::escape($user_id);

		$sql = "SELECT * FROM `object_count` WHERE `user`='$user_id' AND `object_type`='song' ORDER BY `date` DESC LIMIT 1";
		$db_results = Dba::read($sql);

		$results = Dba::fetch_assoc($db_results);

		return $results;

	} // get_last_song

	/**
 	 * get_object_history
	 * This returns the objects that have happened for $user_id sometime after $time
	 * used primarly by the democratic cooldown code
	 */
	public static function get_object_history($user_id='',$time) {

		$user_id = $user_id ? $user_id : $GLOBALS['user']->id;

		$user_id = Dba::escape($user_id);

		$time = Dba::escape($time);

		$sql = "SELECT * FROM `object_count` WHERE `user`='$user_id' AND `object_type`='song' AND `date`>='$time' " .
			"ORDER BY `date` DESC";
		$db_results = Dba::read($sql);

		$results = array();

		while ($row = Dba::fetch_assoc($db_results)) {
			$results[] = $row['object_id'];
		}

		return $results;

	} // get_object_history

	/**
 	 * get_top
	 * This returns the top X for type Y from the
	 * last conf('stats_threshold') days
	 */
	public static function get_top($type,$count='',$threshold = '') {

		/* If they don't pass one, then use the preference */
		if (!$threshold) {
			$threshold = Config::get('stats_threshold');
		}

		if (!$count) {
			$count = Config::get('popular_threshold');
		}

		$count	= intval($count);
		$type	= self::validate_type($type);
		$date	= time() - (86400*$threshold);

		/* Select Top objects counting by # of rows */
		$sql = "SELECT object_id,COUNT(id) AS `count` FROM object_count" .
			" WHERE object_type='$type' AND date >= '$date'" .
			" GROUP BY object_id ORDER BY `count` DESC LIMIT $count";
		$db_results = Dba::read($sql);

		$results = array();

		while ($row = Dba::fetch_assoc($db_results)) {
			$results[] = $row['object_id'];
		}

		return $results;

	} // get_top

	/**
 	 * get_user
	 * This gets all stats for atype based on user with thresholds and all
	 * If full is passed, doesn't limit based on date
	 */
	public static function get_user($count,$type,$user,$full='') {

		$count 	= intval($count);
		$type	= self::validate_type($type);
		$user	= Dba::escape($user);

		/* If full then don't limit on date */
		if ($full) {
			$date = '0';
		}
		else {
			$date = time() - (86400*Config::get('stats_threshold'));
		}

		/* Select Objects based on user */
		//FIXME:: Requires table scan, look at improving
		$sql = "SELECT object_id,COUNT(id) AS `count` FROM object_count" .
			" WHERE object_type='$type' AND date >= '$date' AND user = '$user'" .
			" GROUP BY object_id ORDER BY `count` DESC LIMIT $count";
		$db_results = Dba::read($sql);

		$results = array();

		while ($r = Dba::fetch_assoc($db_results)) {
			$results[] = $r;
		}

		return $results;

	} // get_user

	/**
	 * validate_type
	 * This function takes a type and returns only those
	 * which are allowed, ensures good data gets put into the db
	 */
	public static function validate_type($type) {

		switch ($type) {
			case 'artist':
			case 'album':
			case 'genre':
			case 'song':
			case 'video':
				return $type;
			default:
				return 'song';
			break;
		} // end switch

	} // validate_type

	/**
	 * get_newest
	 * This returns an array of the newest artists/albums/whatever
	 * in this ampache instance
	 */
	public static function get_newest($type,$limit='') {

		if (!$limit) { $limit = Config::get('popular_threshold'); }

		$type = self::validate_type($type);
		$object_name = ucfirst($type);

		$sql = "SELECT DISTINCT(`$type`), MIN(`addition_time`) AS `real_atime` FROM `song` GROUP BY `$type` ORDER BY `real_atime` DESC " .
			"LIMIT $limit";
		$db_results = Dba::read($sql);

		$items = array();

		while ($row = Dba::fetch_row($db_results)) {
			$items[] = $row['0'];
		} // end while results

		return $items;

	} // get_newest

} // Stats class
?>