<?php

/**
 * @file
 * Install, update and uninstall functions for the Nivo Slider module.
 */

/**
 * Implements hook_uninstall().
 */
function nivo_slider_uninstall() {
  // Get the current slider settings
  $slides = variable_get('nivo_slider_banner_settings', array());

  // Delete all of the slide images
  foreach ($slides as $slide) {
    // Check if the slide has a file ID
    if (isset($slide['fid'])) {
      // Load the file that corresponds to the file ID
      $file_object = file_load($slide['fid']);

      // Delete the file
      if ($file_object) {
        file_delete($file_object);
      }
    }
  }

  // Delete the folder the slider images were contained in
  $banner_folder = 'public://banner/';
  file_unmanaged_delete_recursive($banner_folder);

  // Remove slide variables
  variable_del('nivo_slider_banner_settings');
  variable_del('nivo_slider_banner_html_captions');

  // Remove option variables
  variable_del('nivo_slider_theme');
  variable_del('nivo_slider_image_style');
  variable_del('nivo_slider_image_style_slide');
  variable_del('nivo_slider_image_style_thumb');
  variable_del('nivo_slider_random_start');
  variable_del('nivo_slider_start_slide');
  variable_del('nivo_slider_effect');
  variable_del('nivo_slider_slices');
  variable_del('nivo_slider_box_columns');
  variable_del('nivo_slider_box_rows');
  variable_del('nivo_slider_animation_speed');
  variable_del('nivo_slider_pause_on_hover');
  variable_del('nivo_slider_directional_navigation');
  variable_del('nivo_slider_next_text');
  variable_del('nivo_slider_previous_text');
  variable_del('nivo_slider_control_navigation');
  variable_del('nivo_slider_control_nav_thumbs');
  variable_del('nivo_slider_manual_advance');
  variable_del('nivo_slider_pause_time');
  variable_del('nivo_slider_dir_name');
}

/**
 * Image previews are now generated using image styles. Delete the old banner thumbnails.
 */
function nivo_slider_update_7000() {
  $banner_thumb_folder = 'public://banner/thumb/';
  file_unmanaged_delete_recursive($banner_thumb_folder);

  return t('Deleted the old banner thumbnails.');
}

/**
 * Add a default transition to each slide where applicable.
 */
function nivo_slider_update_7001() {
  // Get the current slider settings
  $slider = variable_get('nivo_slider_banner_settings', array());

  // Add a default transition to each existing slide
  foreach ($slider as &$slide) {
    if (!isset($slide['image_transition'])) {
      $slide['image_transition'] = '';
    }
  }

  // Save the updated settings
  variable_set('nivo_slider_banner_settings', $slider);

  return t('Added a default transition to each slide where applicable.');
}

/**
 * Update existing slide property names and add new properties.
 */
function nivo_slider_update_7002() {
  // Create an array to hold the new slider settings
  $new_slider = array();

  // Get the old slider settings
  $old_slider = variable_get('nivo_slider_banner_settings', array());

  foreach ($old_slider as $old_slide) {
    $new_slider[] = array(
      'path' => isset($old_slide['image_path']) ? $old_slide['image_path'] : '',
      'title' => isset($old_slide['image_title']) ? $old_slide['image_title'] : '',
      'description' => array(
        'value' => isset($old_slide['image_description']) ? $old_slide['image_description'] : '',
        'format' => 'plain_text',
      ),
      'url' => isset($old_slide['image_url']) ? $old_slide['image_url'] : '',
      'visibility' => isset($old_slide['image_visibility']) ? $old_slide['image_visibility'] : '*',
      'transition' => isset($old_slide['image_transition']) ? $old_slide['image_transition'] : '',
      'weight' => isset($old_slide['image_weight']) ? $old_slide['image_weight'] : 1,
      'published' => isset($old_slide['image_published']) ? $old_slide['image_published'] : TRUE,
      'delete' => isset($old_slide['image_delete']) ? $old_slide['image_delete'] : '',
    );
  }

  // Save the new settings
  variable_set('nivo_slider_banner_settings', $new_slider);

  return t('Updated existing slide property names and added new properties.');
}

/**
 * Remove obsolete variables.
 */
function nivo_slider_update_7003() {
  variable_del('nivo_slider_caption_opacity');
  variable_del('nivo_slider_keyboard_navigation');

  return t('Removed obsolete variables.');
}

/**
 * Convert existing slide URIs to file IDs.
 */
function nivo_slider_update_7004() {
  // Get the current slider settings
  $slider = variable_get('nivo_slider_banner_settings', array());

  // Process each of the slides
  foreach ($slider as &$slide) {
    // If the slide has a URI continue processing, otherwise delete the slide
    if (isset($slide['path'])) {
      // Find the URI of the current slide
      $uri = $slide['path'];

      // Find the file ID of the file with the URI
      $fid = db_query('SELECT fid FROM {file_managed} WHERE uri = :uri', array(':uri' => $uri))->fetchField();

      // If the ID of the slide's image file can be found then load the file
      // otherwise, delete the slide
      if (!empty($fid)) {
        // Load the file with the file ID
        $file = file_load($fid);

        // Add the file ID to the slide settings
        $slide['fid'] = $file->fid;

        // Remove the existing path setting
        unset($slide['path']);
      }
      else {
        unset($slide);
      }
    }
    else {
      unset($slide);
    }
  }

  // Save the updated settings
  variable_set('nivo_slider_banner_settings', $slider);

  return t('Converted existing slide URIs to file IDs.');
}

/**
 * Remove obsolete variables.
 */
function nivo_slider_update_7005() {
  variable_del('nivo_slider_directional_navigation_hide');

  return t('Removed obsolete variables.');
}