<?php

/**
 * @file
 * Features file for the exif_custom module.
 */
/**
 * Implements hook_features_api().
 */
function exif_custom_features_api(){
  return array(
    'exif_custom' => array(
      'name' => t('EXIF Custom mappings'),
      'default_hook' => 'exif_custom_export_maps',
      'feature_source' => TRUE,
      'default_file' => FEATURES_DEFAULTS_INCLUDED,
      'file' => drupal_get_path('module', 'exif_custom') . '/exif_custom.features.inc'
    )
  );
}

/**
 * Implements COMPONENT_features_export_options().
 *
 * Inform features about the available mappings in the database.
 */
function exif_custom_features_export_options(){
  return db_select('exif_custom_maps', 'e')->fields('e', array(
    'name',
    'name'
  ))->execute()->fetchAllKeyed();
}

/**
 * Implements COMPONENT_features_export().
 *
 * Process the features export array for mappings.
 */
function exif_custom_features_export($data, &$export, $module_name){
  $export['dependencies']['exif_custom'] = 'exif_custom';
  foreach($data as $component){
    $export['features']['exif_custom'][$component] = $component;
  }
  return array();
}

/**
 * Implements COMPONENT_features_export_render().
 *
 * Render mappings as code.
 */
function exif_custom_features_export_render($module_name, $data){
  $items = array();
  foreach($data as $name){
    $items[$name] = exif_custom_export_maps($name);
  }
  $code = "  return " . features_var_export($items, '  ') . ";";
  return array(
    'exif_custom_export_maps' => $code
  );
}

/**
 * Implements COMPONENT_features_revert().
 */
function exif_custom_features_revert($module){
  exif_custom_features_rebuild($module);
}

/**
 * Implements COMPONENT_features_enable_feature().
 */
function exif_custom_features_enable_feature($module){
  exif_custom_features_rebuild($module);
}

/**
 * Implements COMPONENT_features_rebuild().
 *
 * Store each exported mapping in the database.
 */
function exif_custom_features_rebuild($module){
  $defaults = features_get_default('exif_custom', $module);
  foreach($defaults as $map){
    exif_custom_import_map($map);
  }
}

/**
 * Custom function for exporting mappings to code
 */
function exif_custom_export_maps($name){
  $map = array();
  // Get all of the field mappings
  $query = db_select('exif_custom_mapped_fields', 'f')->fields('f', array(
    'exif_field',
    'exif_example',
    'img_field'
  ));
  $query->innerJoin('exif_custom_maps', 'm', 'm.mid = f.mid');
  $query->condition('m.name', $name);
  $fields = $query->execute()->fetchAll();
  $map = array(
    'name' => $name,
    'fields' => $fields
  );
  return $map;
}

/**
 * Custom function for import mappings from code.
 */
function exif_custom_import_map($map){
  $mid = db_select('exif_custom_maps', 'm')->fields('m', array(
    'mid'
  ))->condition('name', $map['name'])->execute()->fetchField();
  if($mid){
    db_delete('exif_custom_users')->condition('mid', $mid)->execute();
    db_delete('exif_custom_mapped_fields')->condition('mid', $mid)->execute();
  }else{
    $mid = db_insert('exif_custom_maps')->fields(array(
      'name' => $map['name']
    ))->execute();
  }
  // Insert fields.
  $insert = db_insert('exif_custom_mapped_fields');
  $field_names = array_keys($map['fields'][0]);
  $field_names[] = 'mid';
  $insert->fields($field_names);
  // Add mid to each row.
  foreach($map['fields'] as $field){
    $field['mid'] = $mid;
    $insert->values($field);
  }
  $insert->execute();
  // Finally, we update all rows that do not have an existing field (Perhaps the
  // feature should export the required fields for the image entity).
  $subquery = db_select('field_config_instance', 'f')->fields('f', array(
    'field_name'
  ))->condition('entity_type', 'file')->condition('bundle', 'image');
  db_update('exif_custom_mapped_fields')->fields(array(
    'img_field' => 'none'
  ))->condition('img_field', $subquery, 'NOT IN')->execute();
}