<?

define('LASTFM_API_URL', 'http://ws.audioscrobbler.com/2.0/?method=');
class LastFM {

	public static function get_artist_events($ArtistID, $Artist, $Limit = 15) {
		global $Cache;
		$ArtistEvents = $Cache->get_value("artist_events_$ArtistID");
		if (empty($ArtistEvents)) {
			$ArtistEvents = self::lastfm_request("artist.getEvents", array("artist" => $Artist, "limit" => $Limit));
			$Cache->cache_value("artist_events_$ArtistID", $ArtistEvents, 432000);
		}
		return $ArtistEvents;
	}

	public static function get_user_info($Username) {
		global $Cache;
		$Response = $Cache->get_value("lastfm_user_info_$Username");
		if (empty($Response)) {
			$Response = self::lastfm_request("user.getInfo", array("user" => $Username));
			$Cache->cache_value("lastfm_user_info_$Username", $Response, 86400);
		}
		return $Response;
	}

	public static function compare_user_with($Username1, $Limit = 15) {
		global $Cache, $LoggedUser, $DB;
		$DB->query("
			SELECT username
			FROM lastfm_users
			WHERE ID = '$LoggedUser[ID]'");
		if ($DB->has_results()) {
			list($Username2) = $DB->next_record();
			//Make sure the usernames are in the correct order to avoid dupe cache keys.
			if (strcasecmp($Username1, $Username2)) {
				$Temp = $Username1;
				$Username1 = $Username2;
				$Username2 = $Temp;
			}
			$Response = $Cache->get_value("lastfm_compare_$Username1" . "_$Username2");
			if (empty($Response)) {
				$Response = self::lastfm_request("tasteometer.compare", array("type1" => "user", "type2" => "user", "value1" => $Username1, "value2" => $Username2, "limit" => $Limit));
				$Response = json_encode($Response);
				$Cache->cache_value("lastfm_compare_$Username1" . "_$Username2", $Response, 86400);
			}
			return $Response;
		}
	}

	public static function get_last_played_track($Username) {
		global $Cache;
		$Response = $Cache->get_value("lastfm_last_played_track_$Username");
		if (empty($Response)) {
			$Response = self::lastfm_request("user.getRecentTracks", array("user" => $Username, "limit" => 1));
			// Take the single last played track out of the response.
			$Response = $Response['recenttracks']['track'];
			$Response = json_encode($Response);
			$Cache->cache_value("lastfm_last_played_track_$Username", $Response, 7200);
		}
		return $Response;
	}

	public static function get_top_artists($Username, $Limit = 15) {
		global $Cache;
		$Response = $Cache->get_value("lastfm_top_artists_$Username");
		if (empty($Response)) {
			sleep(1);
			$Response = self::lastfm_request("user.getTopArtists", array("user" => $Username, "limit" => $Limit));
			$Response = json_encode($Response);
			$Cache->cache_value("lastfm_top_artists_$Username", $Response, 86400);
		}
		return $Response;
	}

	public static function get_top_albums($Username, $Limit = 15) {
		global $Cache;
		$Response = $Cache->get_value("lastfm_top_albums_$Username");
		if (empty($Response)) {
			sleep(2);
			$Response = self::lastfm_request("user.getTopAlbums", array("user" => $Username, "limit" => $Limit));
			$Response = json_encode($Response);
			$Cache->cache_value("lastfm_top_albums_$Username", $Response, 86400);
		}
		return $Response;
	}

	public static function get_top_tracks($Username, $Limit = 15) {
		global $Cache;
		$Response = $Cache->get_value("lastfm_top_tracks_$Username");
		if (empty($Response)) {
			sleep(3);
			$Response = self::lastfm_request("user.getTopTracks", array("user" => $Username, "limit" => $Limit));
			$Response = json_encode($Response);
			$Cache->cache_value("lastfm_top_tracks_$Username", $Response, 86400);
		}
		return $Response;
	}

	public static function clear_cache($Username, $Uid) {
		global $Cache, $LoggedUser, $DB;
		$Response = $Cache->get_value("lastfm_clear_cache_$LoggedUser" . '_' . $_GET['id']);
		if (empty($Response)) {
			// Prevent clearing the cache on the same uid page for the next 10 minutes.
			$Response = $Cache->cache_value("lastfm_clear_cache_$LoggedUser" . "_$Uid", $Username, 600);
			$Cache->delete_value("lastfm_user_info_$Username");
			$Cache->delete_value("lastfm_last_played_track_$Username");
			$Cache->delete_value("lastfm_top_artists_$Username");
			$Cache->delete_value("lastfm_top_albums_$Username");
			$Cache->delete_value("lastfm_top_tracks_$Username");
			$DB->query("
				SELECT username
				FROM lastfm_users
				WHERE ID = '$LoggedUser[ID]'");
			if ($DB->has_results()) {
				list($Username2) = $DB->next_record();
				//Make sure the usernames are in the correct order to avoid dupe cache keys.
				if (strcasecmp($Username, $Username2)) {
					$Temp = $Username;
					$Username = $Username2;
					$Username2 = $Temp;
				}
				$Cache->delete_value("lastfm_compare_$Username" . "_$Username2");
			}
		}
	}

	private static function lastfm_request($Method, $Args) {
		if (!defined('LASTFM_API_KEY')) {
			return false;
		}
		$Url = LASTFM_API_URL . $Method;
		if (is_array($Args)) {
			foreach ($Args as $Key => $Value) {
				$Url .= "&$Key=" . urlencode($Value);
			}
			$Url .= "&format=json&api_key=" . LASTFM_API_KEY;

			$Curl = curl_init();
			curl_setopt($Curl, CURLOPT_HEADER, 0);
			curl_setopt($Curl, CURLOPT_CONNECTTIMEOUT, 30);
			curl_setopt($Curl, CURLOPT_RETURNTRANSFER, 1);
			curl_setopt($Curl, CURLOPT_URL, $Url);
			$Return = curl_exec($Curl);
			curl_close($Curl);
			return json_decode($Return, true);
		}
	}
}