<?
// a class
class User
{
   public $user, $pass, $fname, $lname, $bday;
   public $user_err, $pass_err, $name_err;

   public function __construct( $post_array ) {
      $this->user = $_POST['username'];
      $this->pass = $_POST['password'];
      $this->pass2 = $_POST['password2'];
      $this->fname = $_POST['first_name'];
      $this->lname = $_POST['last_name'];
      $this->bday = $_POST['birthday'];
	  $this->city = $_POST['city'];
	  $this->state = $_POST['state'];
	  $this->address = $_POST['address'];
	  $this->zip = $_POST['zip'];

      $this->user_err = NULL;
      $this->pass_err = NULL;
      $this->name_err = NULL;
	  $this->birth_err = NULL;
	  $this->city_err = NULL;
	  $this->state_err = NULL;
	  $this->address_err = NULL;
	  $this->zip_err = NULL;
   }

   public function validate() {

      // username isn't a duplicate
      if( !$this->user ) {
         $this->user_err = "Please specify username";
      } else if( duplicate( $this->user ) ) {
         $this->user_err = "That username is already in use";
      }

      // passwords match and are at least 6 chars
      if( !$this->pass || strlen( $this->pass ) < 6 ) {
         $this->pass_err = "Password must be at least 6 characters";
      } else if( $this->pass != $this->pass2 ) {
         $this->pass_err = "Passwords do not match";
      }
		else
         $this->vpass = $_POST['password'];

      // first/last name aren't blank
      if( !$this->fname && !$this->lname ) {
         $this->name_err = "Please provide a first and last name";
      }
	  else if(!$this->fname){
		 $this->name_err = "Please provide a first name";
      }
	  else if(!$this->lname){
		 $this->name_err = "Please provide a last name";
      }

	  if(!$this->bday){
		$this->birth_err = "Please enter your birthday";
	  }

	  if(!$this->city){
		$this->city_err = "Please enter a city";
	  }

	  if(!$this->state){
		$this->state_err = "Please enter a state";
	  }

	  if(!$this->address){
		$this->address_err = "Please enter your address";
	  }

	  if(!$this->zip){
		$this->zip_err = "Please enter your zip code";
	  }

      return !$this->has_errors();
   }

   public function has_errors() {
      return $this->user_err || $this->pass_err || $this->name_err || $this->birth_err || $this->city_err || $this->state_err || $this->address_err || $this->zip_err;
   }

   public function insert()
   {
      $sql = "
INSERT INTO users
(username, password, first_name, last_name, birthdate, city, state, address, zip)
VALUES ( '$this->user', '$this->vpass' ,
'$this->fname', '$this->lname', '$this->bday', '$this->city', '$this->state', '$this->address', '$this->zip');";

      mysql_query( $sql ) or die( "Error( $sql): " . mysql_error() );
   }
}

function duplicate( $username )
{
   $sql = "SELECT id FROM users WHERE username = '$username'";

   $result = mysql_query( $sql ) or die( "Error( $sql): " . mysql_error() );

   return mysql_num_rows( $result ) > 0;
}

?>