<?php

/**
 * Implementation of hook_form_FORM_ID_alter()
 */
function blockexpose_form_block_admin_configure_alter(&$form, &$form_state, $form_id){
  $settings = variable_get('blockexpose_settings_' . $form['module']['#value'] . '_' . $form['delta']['#value'], array(
    'show' => 0,
    'side' => 'right',
    'event' => 'click'
  ));
  $form['blockexpose'] = array(
    '#type' => 'fieldset',
    '#title' => t('Tabify the block'),
    '#group' => 'visibility',
    'display_as_tab' => array(
      '#type' => 'checkbox',
      '#default_value' => $settings['show'],
      '#description' => t('Tick the box to display this block as a tab hidden at the edge of a page'),
      '#title' => t('Display as tab')
    ),
    'display_as_tab_side' => array(
      '#type' => 'select',
      '#default_value' => $settings['side'],
      '#description' => t('What side of the page should the tab be displayed on?'),
      '#title' => t('Side'),
      '#options' => array(
        'left' => t('Left'),
        'right' => t('Right')
      )
    ),
    'display_as_tab_event' => array(
      '#type' => 'select',
      '#default_value' => $settings['event'],
      '#description' => t('On what event should the tab be displayed?'),
      '#title' => t('Event'),
      '#options' => array(
        'click' => t('Click'),
        'hover' => t('Hover')
      )
    )
  );
  $blockexpose_submit = array(
    'blockexpose_block_admin_configure_form_submit'
  );
  $form['#submit'] = is_array($form['#submit']) ? array_merge($form['#submit'], $blockexpose_submit) : $blockexpose_submit;
}

/**
 * Submit function for saving the above settings.
 */
function blockexpose_block_admin_configure_form_submit($form, &$form_state){
  if(isset($form_state['values']['display_as_tab'], $form_state['values']['display_as_tab_side'], $form_state['values']['display_as_tab_event'])){
    variable_set('blockexpose_settings_' . $form_state['values']['module'] . '_' . $form_state['values']['delta'], array(
      'show' => $form_state['values']['display_as_tab'],
      'side' => $form_state['values']['display_as_tab_side'],
      'event' => $form_state['values']['display_as_tab_event']
    ));
  }
}

/**
 * Implementation of hook_theme()
 */
function blockexpose_theme($existing, $type, $theme, $path){
  return array(
    'blockexpose' => array(
      'variables' => array(
        'block' => array(),
        'settings' => array(
          'side' => 'right',
          'show' => 1,
          'event' => 'click'
        )
      )
    )
  );
}

/**
 * Implementation of hook_block_view_alter()
 */
function blockexpose_block_view_alter(&$data, $block){
  // Are we changing this block?
  $settings = variable_get('blockexpose_settings_' . $block->module . '_' . $block->delta, array(
    'show' => 0
  ));
  // We try to check for the has_js variable, but if we're using a reverse proxy
  // we may not be able to, so we simply continue.
  if($settings['show'] && (variable_get('reverse_proxy', FALSE) || (isset($_COOKIE['has_js']) && $_COOKIE['has_js']))){
    // We actually save the $data array for use later in the hook_footer
    // function.  This prevents an empty block from appearing in the side bar
    // (depending on theme).
    $blockexpose = &drupal_static('blockexpose', array());
    $data_copy = $data;
    if(empty($data_copy['subject'])){
      $data_copy['subject'] = $block->title;
    }
    $blockexpose[] = array(
      'data' => $data_copy,
      'block' => $block,
      'settings' => $settings
    );
    // Unset content to prevent this block from being displayed.
    $data['content'] = '';
  }
}

/**
 * Implements hook_block_info_alter().
 * 
 * FIXME - This is not ideal, as it means that blocks exposed using this module
 * are no longer cached.  If the block is intensive to create, it will need to
 * be created on EVERY page - NOT GOOD.
 */
function blockexpose_block_info_alter(&$blocks, $theme, $code_blocks){
  foreach($blocks as $module => $modules_blocks){
    foreach($modules_blocks as $delta => $block){
      $settings = variable_get('blockexpose_settings_' . $module . '_' . $delta, array(
        'show' => 0,
        'side' => 'right',
        'event' => 'click'
      ));
      if($settings['show']){
        // Disable caching for this block, as otherwise we'll screw things up.
        $blocks[$module][$delta]['cache'] = DRUPAL_NO_CACHE;
      }
    }
  }
}

/**
 * Implementation of hook_page_alter()
 * 
 * Note, this adds blocks to the content region, as we can be certain that
 * the content region will be present in all themes.
 * 
 * FIXME - This function should mimic what occurs in _block_render_blocks, but
 * gets our own cache of blocks.
 */
function blockexpose_page_alter(&$page){
  $blockexpose = &drupal_static('blockexpose', array());
  foreach($blockexpose as $block){
    $data = $block['data'];
    $page['content']['blockexpose'][]['#markup'] = theme('blockexpose', array(
      'block' => $data,
      'settings' => $block['settings']
    ));
  }
}

/**
 * Theme function to add JS
 */
function theme_blockexpose($variables){
  drupal_add_js(drupal_get_path('module', 'blockexpose') . '/js/blockexpose.js');
  drupal_add_css(drupal_get_path('module', 'blockexpose') . '/css/blockexpose.css');
  if(isset($variables['block']['content']) && isset($variables['block']['subject'])){
    // Get the number of this tab for the side.
    $side_number = &drupal_static('blockexpose_' . $variables['settings']['side'], 0);
    $side_number++;
    drupal_static('blockexpose_' . $variables['settings']['side'], $side_number);
    $subject = $variables['block']['subject'];
    if(is_array($variables['block']['content'])){
      $block_html = drupal_render($variables['block']['content']);
    }else{
      $block_html = $variables['block']['content'];
    }
    return '<div class="blockexpose ' . $variables['settings']['side'] . ' side-number-' . $side_number . '">
    <div class="content">
      <div class="open-close ' . $variables['settings']['event'] . '">
        <p' . ($variables['settings']['event'] == 'click' ? ' title="Click"' : '') . '>' . $subject . '</p>
      </div>
      <div class="subcontent">
      	' . $block_html . '
      </div>
    </div>
  </div>';
  }
  return '';
}