<?php

/**
 * @file
 * Install, update, and uninstall functions for the Lazy-load module.
 */

/**
 * Implements hook_install().
 */
function lazy_install() {
  $defaults = array(
    'lazy_filter_errorClass' => 'b-error',
    'lazy_filter_loadInvisible' => FALSE,
    'lazy_filter_offset' => 100,
    'lazy_filter_saveViewportOffsetDelay' => 50,
    'lazy_filter_selector' => 'b-lazy',
    'lazy_filter_alter_tag' => array('img' => 'img', 'iframe' => 'iframe'),
    'lazy_filter_skipClass' => 'no-b-lazy',
    'lazy_filter_src' => 'data-src',
    'lazy_filter_successClass' => 'b-loaded',
    'lazy_filter_validateDelay' => 25,
    'lazy_filter_placeholderSrc' => 'data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==',
    'lazy_disabled_paths' => 'rss.xml',
  );

  variable_set('lazy_filter_defaults', $defaults);
  foreach ($defaults as $key => $value) {
    variable_set($key, $value);
  }
}

/**
 * Implements hook_enable().
 */
function lazy_enable() {
  $options = array(
    '!config' => url('admin/config/content/lazy'),
    '%filter' => 'Lazy-load',
    '!path' => url('admin/config/content/formats'),
  );
  $message = t('The <a href="!config">Lazy-load</a> module was installed. The new %filter filter should be enabled in desired <a href="!path">text-formats</a>.', $options);
  drupal_set_message($message, 'warning');
}

/**
 * Implements hook_uninstall().
 */
function lazy_uninstall() {
  variable_del('lazy_filter_defaults');
  variable_del('lazy_filter_errorClass');
  variable_del('lazy_filter_loadInvisible');
  variable_del('lazy_filter_offset');
  variable_del('lazy_filter_saveViewportOffsetDelay');
  variable_del('lazy_filter_selector');
  variable_del('lazy_filter_alter_tag');
  variable_del('lazy_filter_skipClass');
  variable_del('lazy_filter_src');
  variable_del('lazy_filter_successClass');
  variable_del('lazy_filter_validateDelay');
  variable_del('lazy_filter_placeholderSrc');
  variable_del('lazy_filter_image_fields');
  variable_del('lazy_library_installed');
  variable_del('lazy_disabled_paths');

  $module = 'lazy';
  $name = 'lazy_filter';
  db_delete('filter')
    ->condition('module', $module)
    ->condition('name', $name)
    ->execute();

  // Revert image field formatters back to `image`.
  $lazy_enabled_fields = array();
  $field_map = field_info_field_map();
  $i = 1;
  $max_messages = 10;
  foreach ($field_map as $field_name => $field) {
    if ($field['type'] === 'image') {
      foreach ($field['bundles'] as $entity_type => $bundle) {
        $field_instance = field_info_instance($entity_type, $field_name, $bundle[0]);
        foreach ($field_instance['display'] as $display_name => $display) {
          if ($field_instance['display'][$display_name]['module'] === 'lazy') {
            $field_instance['display'][$display_name]['type'] = 'image';
            $field_instance['display'][$display_name]['module'] = 'image';
            field_update_instance($field_instance);
            if ($i <= $max_messages) {
              drupal_set_message(t('The %label (<code>!field_name</code>) field in %bundle (!entity_type) type is reverted back in the %display display mode.', array(
                  '%label' => $field_instance['label'],
                  '!field_name' => $field_instance['field_name'],
                  '%bundle' => $field_instance['bundle'],
                  '!entity_type' => $field_instance['entity_type'],
                  '%display' => $display_name,
                )),
                'warning',
                TRUE
              );
            }
            $i++;
          }
        }
      }
    }
  }
  if ($i > $max_messages) {
    drupal_set_message(t('Also reverted back %no other image fields.', array('%no' => $i - $max_messages)));
  }
}

/**
 * Implements hook_requirements().
 */
function lazy_requirements($phase) {
  $requirements = array();
  $t = get_t();

  if ($phase == 'runtime') {
    $blazy = libraries_detect('blazy');
    $requirements['blazy'] = array(
      'title' => $t('bLazy'),
    );
    if ($blazy['installed']) {
      $requirements['blazy']['value'] = $blazy['version'];
      $requirements['blazy']['severity'] = REQUIREMENT_OK;
    }
    else {
      $requirements['blazy']['value'] = $blazy['error'];
      $requirements['blazy']['description'] = $blazy['error message'];
      $requirements['blazy']['severity'] = REQUIREMENT_ERROR;
    }

    variable_set('lazy_library_installed', $blazy['installed']);
  }

  return $requirements;
}

/**
 * Update module default values.
 */
function lazy_update_7100() {
  // Get current default values.
  $defaults = variable_get('lazy_filter_defaults');

  // Update it from old string value to new array value.
  $defaults['lazy_filter_alter_tag'] = array('img' => 'img', 'iframe' => 'iframe');
  // Fix already existing value with new format.
  $lazy_filter_alter_tag = variable_get('lazy_filter_alter_tag');
  switch ($lazy_filter_alter_tag) {
    case 'img':
      variable_set('lazy_filter_alter_tag', array('img' => 'img', 'iframe' => 0));
      break;

    case 'iframe':
      variable_set('lazy_filter_alter_tag', array('img' => 0, 'iframe' => 'iframe'));
      break;

    default:
      variable_set('lazy_filter_alter_tag', $defaults['lazy_filter_alter_tag']);
      break;
  }

  // Add new setting to support image fields.
  $defaults['lazy_filter_image_fields'] = FALSE;

  // Update the defaults with new values.
  variable_set('lazy_filter_defaults', $defaults);
  variable_set('lazy_filter_image_fields', $defaults['lazy_filter_image_fields']);
}

/**
 * Disable module, if bLazy library is not installed yet.
 */
function lazy_update_7101() {
  $blazy = libraries_detect('blazy');
  variable_set('lazy_library_installed', $blazy['installed']);
}

/**
 * New configuration option to set which pages should disable Lazy-loading.
 */
function lazy_update_7102() {
  $defaults = variable_get('lazy_filter_defaults');
  $defaults['lazy_disabled_paths'] = 'rss.xml';
  variable_set('lazy_filter_defaults', $defaults);
  variable_set('lazy_disabled_paths', $defaults['lazy_disabled_paths']);
}

/**
 * Image fields now use display formatter to enable lazy-loading per field.
 */
function lazy_update_7103() {
  $image_fields = variable_get('lazy_filter_image_fields');
  if ($image_fields) {
    $field_map = field_info_field_map();
    foreach ($field_map as $field_name => $field) {
      if ($field['type'] === 'image') {
        foreach ($field['bundles'] as $entity_type => $bundle) {
          $field_instance = field_info_instance($entity_type, $field_name, $bundle[0]);
          foreach ($field_instance['display'] as $display_name => $display) {
            if ($field_instance['display'][$display_name]['type'] === 'image') {
              $field_instance['display'][$display_name]['type'] = 'lazy';
              $field_instance['display'][$display_name]['module'] = 'lazy';
              field_update_instance($field_instance);
            }
          }
        }
      }
    }
  }
  variable_del('lazy_filter_image_fields');
}