<?php
/**!info**
{
  "Plugin Name"  : "Karma",
  "Plugin URI"   : "http://example.com/",
  "Description"  : "Karma is a plugin that enables in the user page a voting system, to evaluate the popularity of each member.",
  "Author"       : "Adriano Pereira",
  "Version"      : "1.0",
  "Author URI"   : "http://enanocms.org/"
}
**!*/

$plugins->attachHook('userpage_sidebar_left',  'karma();');

function karma()
{
  // Importing...
  global $db, $session, $paths;
  
  if($session->user_logged_in)
  {  

  // If the user votes, get the vote
  $vote = @$_GET['vote'];
  
  // Get the user_id from the user that is voting
  $user_voting_id = $session->user_id;
  
  // Find the page_id that is the username of the current user page and gets the user_id from database
  $username = $paths->page_id;
  
  $q = $db->sql_query('SELECT user_id FROM '. table_prefix. "users WHERE username = '$username'");
  if ( !$q )
    $db->_die();
  $voted = $db->fetchrow();
  $user_voted_id = $voted['user_id'];
  
  // Retrieves from database the total votes, yes votes, no votes and the karma from user
  $q = $db->sql_query('SELECT karma, karma_total_votes, karma_yes_votes, karma_no_votes FROM '. table_prefix."users_extra WHERE user_id = '$user_voted_id'");
  if ( !$q )
    $db->_die();
  $karma_info = $db->fetchrow();
  $total_votes = $karma_info['karma_total_votes'];
  $yes_votes = $karma_info['karma_yes_votes'];
  $no_votes = $karma_info['karma_no_votes'];
  $karma = $karma_info['karma'];
  
  // Search in the database if the user has already voted in this user
  $q = $db->sql_query('SELECT user_voted_id, user_voting_id FROM '. table_prefix."karma WHERE user_voted_id = '$user_voted_id' AND user_voting_id = '$user_voting_id'");
  if ( !$q )
    $db->_die();
  $num_votes = $db->numrows();
  
  // If the user that votes and the user voted id is equal or the user has already voted, displays the commom page
  if ($user_voting_id == $user_voted_id) goto commom_page_title; 
  
  if ($num_votes == 0 && empty($vote)) goto vote;
  
  if ($num_votes != 0) goto commom_page_title;

  // Know if the vote is yes or no and do the respective action in database
  if ($vote == 'Yes')
  {
	$karma = $karma + 1;
	$total_votes = $total_votes + 1;
	$yes_votes = $yes_votes + 1;
	$q = $db->sql_query('INSERT INTO '. table_prefix."karma (user_voting_id, user_voted_id) VALUES ('$user_voting_id', '$user_voted_id')");
	if ( !$q )
      $db->_die();
	$q = $db->sql_query('UPDATE '. table_prefix."users_extra SET karma = '$karma', karma_total_votes = '$total_votes', karma_yes_votes = '$yes_votes' WHERE user_id = '$user_voted_id'");
    if ( !$q )
      $db->_die();  
  }  
  elseif ($vote == 'No')
  {
	$karma = $karma - 1;
	$total_votes = $total_votes + 1;
	$no_votes = $no_votes + 1;
	$q = $db->sql_query('INSERT INTO '. table_prefix."karma (user_voting_id, user_voted_id) VALUES ('$user_voting_id', '$user_voted_id')");
	if ( !$q )
      $db->_die();
	$q = $db->sql_query('UPDATE '. table_prefix."users_extra SET karma = '$karma', karma_total_votes = '$total_votes', karma_no_votes = '$no_votes' WHERE user_id = '$user_voted_id'");
	if ( !$q )
      $db->_die();	
  }
  else commom_page_title;
  
  // Label to commom page title
  commom_page_title:
?>
 <th colspan="4"><?php echo $username."'s karma"; goto commom_page;?></th>
	<?php
	vote:
	echo "<th colspan='4'>". $username."'s karma</th>";
	echo <<<EOF
		<tr>
		<td colspan="4" class="row3" style="text-align: center;">
		<b>Do you like me?</b><br/>
		<form action=''>
			<input type="submit" value="Yes" name="vote" style="background-color: #00CA00; border: 2px solid #000000; width: 40px; color: #FFFFFF; font-size: 14px; text-align:center;">
			<input type="submit" value="No" name="vote" style="background-color: #FA1205; border: 2px solid #000000; width: 40px; color: #FFFFFF; font-size: 14px; text-align:center;">
		</form>
	</tr>
EOF;
  
  // Label to commom page content and page content
  commom_page:
  
  if ($karma < 0)
  {
	$karma_color = '#FA1205';
  }
  elseif ($karma > 0)
  { 
   $karma_color = '#00CA00';
  }
  else
   {
   $karma_color = '#000000';
  }
?>
	<tr>
		<td colspan="2" class="row1">
			Your Karma is: <font color="<?php echo $karma_color;?>"><?php echo $karma;?><br/></font>
		</td>
		
		<td colspan="2" class="row2">
			'Yes' votes: <?php echo $yes_votes;?><br/>
			'No' votes: <?php echo $no_votes;?><br/>
			Number of votes: <?php echo $total_votes;?><br/>			
		</td>
	</tr>
<?php
}
}

/**!install dbms="mysql"; **
CREATE TABLE {{TABLE_PREFIX}}karma(
  vote_id int(18) NOT NULL auto_increment,
  user_voting_id int(12),
  user_voted_id int(12),  
  PRIMARY KEY ( vote_id )
 ) ENGINE=`MyISAM` CHARSET=`UTF8` COLLATE=`utf8_bin`;
 
ALTER TABLE {{TABLE_PREFIX}}users_extra ADD COLUMN karma int(12) DEFAULT 0;
ALTER TABLE {{TABLE_PREFIX}}users_extra ADD COLUMN karma_total_votes int(12) DEFAULT 0;
ALTER TABLE {{TABLE_PREFIX}}users_extra ADD COLUMN karma_yes_votes int(12) DEFAULT 0;
ALTER TABLE {{TABLE_PREFIX}}users_extra ADD COLUMN karma_no_votes int(12) DEFAULT 0;

**!*/

/**!uninstall **
DROP TABLE {{TABLE_PREFIX}}karma;
ALTER TABLE {{TABLE_PREFIX}}users_extra DROP karma;
ALTER TABLE {{TABLE_PREFIX}}users_extra DROP karma_total_votes;
ALTER TABLE {{TABLE_PREFIX}}users_extra DROP karma_yes_votes;
ALTER TABLE {{TABLE_PREFIX}}users_extra DROP karma_no_votes;
**!*/


?>