<?php

/*******************************************************************
	DRUPAL HOOKS
*******************************************************************/

function userpoints_revision_nodeapi(&$node, $op, $teaser, $page)
{
  	switch ($op)
	{
	
		case 'update':

			if($node->revision)
			{
				global $user;
				$points_own_nodes = variable_get('userpoint_revision_own_nodes', 0);
				if(!$points_own_nodes && $user->uid==$node->uid)
					break;
				//load old node revision to compare against
				$old_node = node_load($node->nid);
				
				//flag for significant changes between the two revisions
				$change = FALSE;
				
				//lets check the length of content in each revision
					$size1 = strlen($old_node->body);
					$size2 = strlen($node->body);
					
					$diff = abs($size1 - $size2);
				
				if($diff > 20)
				{
					$change = TRUE;
				}
				//similar character count, lets check character by character
				else
				{
					$count = 0;
					
					for($i = 0; $i < $size1, $i < $size2; $i++)
					{
						if($old_node->body{$i} != $node->body{$i})
						{
							$count++;
						}
					}
					
					if($count > 20)
					{
						$change = TRUE;
					}
				}
								
				if($change)
				{
					$points = variable_get('userpoints_revision_'.$node->type, 0);
			
					$params = array(
						'points' 		=> $points,
						'uid' 			=> $user->uid,
						'operation' 	=> t('New revision'),
						'entity_id'		=> $node->nid,
						'entity_type'	=> 'node'
					);
					
					userpoints_userpointsapi($params);
				}
			}
						
			break;
	}
}

/*******************************************************************
	USERPOINTS HOOKS
*******************************************************************/

function userpoints_revision_userpoints($op, $params = array())
{
	switch($op)
	{
		case 'setting':

			$form['revision'] = array(
				'#collapsed'	=> TRUE,
				'#collapsible'	=> TRUE,
				'#title'		=> t('!Points for creating node revisions',
									userpoints_translation()),
				'#type' 		=> 'fieldset',
			);
			
			$form['revision']['userpoint_revision_own_nodes'] = array(
				'#type' => 'checkbox',
				'#default_value' => variable_get('userpoint_revision_own_nodes', 0),
				'#title' => t('Award points for revisions by the node author'),
			);

			foreach (node_get_types() as $type => $name)
			{
				$form['revision']['userpoints_revision_'.$type] = array(
					'#default_value' => variable_get('userpoints_revision_'.$type, '0'),					
					'#maxlength'     => 5,
					'#size'          => 5,
					'#title'         => t('!Points for creating a revision of a
											!node-name',
											array_merge(
												userpoints_translation(),
												array('!node-name' => $name->name)
											)
										),
					'#type'          => 'textfield',
				);
			}

			return $form;

			break;
	}
}