<?php


//include album class

include_once(LIBDIR .'../Artist/Artist.php.class');

class ArtistAdmin {

	
/**
* Class constructor
*
* @param $db - an instance of the Db class
*
* @return an instance of the AlbumAdmin class
*
**/

function ArtistAdmin($db_obj) {

	// ensure we have logger access
	
	
	global $logger;
	
	
	if(strtolower(get_class($logger)) != 'logger') {
		
		
		die(__FILE__. "FATAL ERROR: no valid global logger object is instantiated - you must have a global \$logger object to continue");
		
		
	}

	// verify our db object
	
	if(!is_object($db_obj) or get_class($db_obj) != 'db') {
		
		$logger->fatal("DB OBJECT PASSED TO " . __FILE__. " CONSTRUCTOR IS INVALID! - CLASS PASSED WAS A " . get_class($db_obj));
		
	}
	
	
	
	$this->_db = $db_obj;
	
	
	return $this;

}


/**
* Class constructor
*
* @param $new_artist_details -  array of data to add a new artist
*
* @return an instance of the ArtistAdmin class
*
**/


function createArtist($new_artist_details) {

	//Logger
	
	global $logger;
	
	
	//Error
	
	(bool)$error = false;
	
	
	// sanity check
	
	
	(array)$required_param = array( 'name', 'website', 'bio' );			
	
	
	if(!is_array($new_artist_details)) {
		
		$logger->warn("Not a valid array");
		
		return null;
	}
	
	
	foreach($required_param as $param) {
	  
	  if(empty($new_artist_details[$param])) {
	  	
	  		
			$logger->warn("Required parameter is not set ($new_artist_details[$param]) -- cannot create artist"); 
		
			
			return NULL;
			
		}
	}	
	
	
  	if($error==false) {


	// Insert the artist
	
	(object)$res = $this->_db->query("INSERT INTO artists (name, website, bio) 
							VALUES ('%s', '%s', '%s')",
							array ( $new_artist_details['name'], 
									$new_artist_details['website'], 
									$new_artist_details['bio'])); 


	if(!$res) {
		
		$logger->warn("Artist insert query failed - " . mysql_error());
		
		print_r("Artist insert query failed - " . mysql_error() ."\n\n");
	}
	
	 
	 global $new_artist_id;
	
	(integer)$new_artist_id = mysql_insert_id();


	// use class artist	

       $artist_obj = new Artist($this->_db, $new_artist_id);
       
	   return $artist_obj ;

}


}
function updateArtist($artist_id, $revised_artist_details) {

	//Logger
	
	global $logger;

	//Error
	
	(bool)$error = false;

	// sanity check
	
	(array)$required_param = array( 'name', 'website', 'bio' );			
	
	
	if(!is_array($revised_artist_details)) {
		
		
		$logger->warn("Not a valid array");
		
		return null;
	}
	
	
	foreach($required_param as $param) {
		
	if(empty($new_artist_details[$param])) {

		$erorrs = true;
		
		$logger->warn("Required parameter is not set ($revised_artist_details[$param]) -- cannot create artist");
		
		
			return NULL;
			
		}
  }	
  
  
  	
	//checks valid artist_id and sets default array value
	
	(object)$sql = $this->_db->query("SELECT 
											artistid, 
											
											name, 
											
											website, 
											
											bio 
											
									 		FROM artists 
									  
								WHERE artistid = $artist_id ") or die (mysql_error());
	
	if(!$sql) {
		
		$logger->warn("Artist update query failed - " . mysql_error());
		
		print_r("Artist update query failed - " . mysql_error() ."\n\n");
		
	}
	
	if($sql) {
	
	while (list ($key, $val) = each ($revised_artist_details)){  
		
 	if ($i > 0){ 
 		
			 $fields .= ", "; 
			 
             $values .= ", "; 
             
             $updateList .= ", "; 
             
            } 

            $fields .= $key;  
            
            $updateList .= "$key='$val'"; 
            
            $values .= "'$val'";  
            
			$i++; 

	} 
			
			
  (object)$query = $this->_db->query("update artists  set $updateList WHERE artistid = '$artist_id'") 	or die ("UPDATE ERROR : " . mysql_error());  
  

	
		if(mysql_affected_rows() > 0 ) 			
	
		return 1;
      
        
		if(mysql_affected_rows() < 1 )
		
		return 0;
		

	}

}

}

?>