<?php

/**!info**

{

  "Plugin Name"  : "Karma",

  "Plugin URI"   : "http://enanocms.org/plugin/karma",

  "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

  $vote = !empty($_GET['vote']) && in_array($_GET['vote'], array('Yes', 'No'))

            ? $_GET['vote']

            : null;

  // 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

  $username = str_replace('_', ' ', dirtify_page_id($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 = $db->sql_query('SELECT karma_yes_votes, karma_no_votes, (karma_yes_votes + karma_no_votes) AS karma_total_votes, (karma_yes_votes - karma_no_votes) AS karma FROM '. table_prefix."users_extra WHERE user_id = '$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();

  $db->free_result();

  // If the user that votes and the user voted id is equal or the user has already voted, displays the commom page

  // If we're on our own user page, block voting

  $same_user = $user_voting_id === $user_voted_id;

  // If we have not yet voted on this user, allow that to take place below

  $can_vote = $num_votes == 0 && !$same_user && $session->user_level >= USER_LEVEL_MEMBER;

  echo "<th colspan='4'>$username's karma</th>";

  $did_vote = false;

  if ( $can_vote )

  {

    // Know if the vote is yes or no and do the respective action in database

    $increment_col = !empty($vote) && $vote == 'Yes' ? 'karma_yes_votes' : 'karma_no_votes';

    if ( !empty($vote) )

    {

      $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 $increment_col = $increment_col + 1");

        if ( !$q )

          $db->_die();

      if ( $vote == 'Yes' )

        $yes_votes++;

      else

        $no_votes++;

      // recalculate

      $karma = $yes_votes - $no_votes;

      $total_votes = $yes_votes + $no_votes;

      $did_vote = true;

    }

    else

    {

      // Label to commom page title

      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

  if ($karma < 0)

  {

	  $karma_color = '#FA1205';

  }

  elseif ($karma > 0)

  { 

    $karma_color = '#00CA00';

  }

  else

  {

    $karma_color = '#000000';

  }

?>

  <?php if ( $did_vote ): ?>

    <tr>

      <td colspan="4" class="row3">

        <div class="info-box-mini">Thanks for voting for this user's karma.</div>

      </td>

    </tr>

  <?php endif; ?>

	<tr>

		<td colspan="2" class="row1">

      Your Karma is: <span style="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_yes_votes int(12) NOT NULL DEFAULT 0;

ALTER TABLE {{TABLE_PREFIX}}users_extra ADD COLUMN karma_no_votes int(12) NOT NULL DEFAULT 0;

**!*/

/**!uninstall **

DROP TABLE {{TABLE_PREFIX}}karma;

ALTER TABLE {{TABLE_PREFIX}}users_extra DROP karma_yes_votes;

ALTER TABLE {{TABLE_PREFIX}}users_extra DROP karma_no_votes;

**!*/

?>