<?php
// $Id$

function fedora_fesl_check_roles($checkPid,$checkPerm='write') {
  global $user; 
  $ret = FALSE;
  if ($user != null) {
    $cache_key = 'fedora_fesl_check_roles'.md5($user->name.$checkPid.$checkPerm);
    if (($output = cache_get($cache_key))===0)  
    {
      $roles = $user->roles;
	if (in_array('administrator',$roles)) {
	  $ret = true; 
	} else 
	{
	module_load_include('inc', 'fedora_repository', 'api/fedora_item');
	$found = array(); 
	foreach ($roles as $role) {
	  if (preg_match('/^(([A-Za-z0-9]|-|\.)+:(([A-Za-z0-9])|-|\.|~|_|(%[0-9A-F]{2}))+)\s+(write|read)/',$role,$matches)) {
	  $pid = $matches[1]; 
	  $perm = $matches[6];
	  
	  if ($perm == $checkPerm) {
	      $found[]=$pid;
	  }
	  }
	}
	if (count($found) > 0) {
	  if (in_array($checkPid,$found)) {
	    $ret = TRUE;
	  }
	  $item=new Fedora_Item($checkPid);
	  $rels=$item->get_relationships();

	  if (count($rels) > 0) {
	    foreach ($rels as $rel) {
	      $ret = $ret || fedora_fesl_check_roles($rel['object'],$checkPerm);
	    }  
	  }
	}
      }

      cache_set($cache_key,$ret,'cache',time()+variable_get('fedora_image_blocks_cache_time',3600));

    } else {
      if (is_object($output))
      {
	$ret=$output->data;
      }
    }
  }
  return $ret;
}

function fedora_fesl_block($op = 'list', $delta = 0, $edit = array()) {
  // The $op parameter determines what piece of information is being requested.
  switch ($op) {
    case 'list':
      // If $op is "list", we just need to return a list of block descriptions.
      // This is used to provide a list of possible blocks to the administrator,
      // end users will not see these descriptions.
      $blocks[0] = array(
        'info' => t('FeSL Collections Listing Block'),
      );


      return $blocks;
    case 'configure':
      $form = array();
      switch ($delta) {
        case 0:
/*	 $form['fedora_image_rotator_block_numimages'] = array(
            '#type'=>'textfield',
            '#title' => t('The number of images to display in the block.'),
            '#default_value' => variable_get('fedora_image_rotator_block_numimages',1));*/
          break;

      }

      return $form;
    case 'save':
      // If $op is "save", we need to save settings from the configuration form.
      // Since the first block is the only one that allows configuration, we
      // need to check $delta to make sure we only save it.
      switch ($delta) {
        case 0:
// 	variable_set('fedora_image_rotator_block_query', $edit['fedora_image_rotator_block_query']);
	break;
        

      }
      return;
    case 'view': default:
      // If $op is "view", then we need to generate the block for display
      // purposes. The $delta parameter tells us which block is being requested.
      switch ($delta) {
        case 0:
          module_load_include('inc', 'fedora_fesl', 'fesl_block');
          $block['subject'] = t('My Collections');
          $block['content'] = _fedora_fesl_block_content();
          break;
  
      }

      return $block;
  }
}