<?php
// $Id$

/**
 * @file
 * On behalf implementation of Feeds mapping API for location.module.
 */

/**
 * Implementation of feeds_node_processor_target_alter
 *
 * For sub elements we use the '][' construct
 *
 * @param $targets array of target fields
 * @param $content_type
 */
function location_feeds_node_processor_targets_alter(&$targets, $content_type) {
  
  // location.module logic
	$settings = variable_get('location_settings_node_'. $content_type, array());
	// Only add fields when collecting locations
	if (isset($settings['multiple']['max']) && $settings['multiple']['max'] > 0) {
    $location_fields= _location_feeds_fields();
		
		// We need the collect settings
		$fields = $settings['form']['fields'];
		// locpick is a compound field. So split it
		$fields['locpick][user_latitude'] = $fields['locpick'];
		$fields['locpick][user_longitude'] = $fields['locpick'];
		unset($fields['locpick']);

		foreach ($fields as $field => $values) {
			if (! $values['collect']) {
				unset($location_fields[$field]);
			}
		}
		
		_location_feeds_fill_targets(&$targets, 'location', 'locations', $location_fields);
	}
	
	// location_cck.module logic
	$info = content_types($content_type);
  if (isset($info['fields']) && count($info['fields'])) {
    foreach ($info['fields'] as $field_name => $field) {
      $location_fields= _location_feeds_fields();
    	if (in_array($field['type'], array('location'))) {
        $name = isset($field['widget']['label']) ? $field['widget']['label'] : $field_name;
        
        _location_feeds_fill_targets(&$targets, 'location_cck', $name, $location_fields);
      }
    }
  }
}

/**
 * Helper function to add target fields
 * 
 * @param $targets
 * @param $module
 *   Module name providing the field.
 * @param $field_name
 *   Field name where values are supposed to get stored to.
 * @param $sub_fields
 *   Location elements for the given $field_name
 */
function _location_feeds_fill_targets(&$targets, $module, $field_name, $sub_fields) {
	foreach ($sub_fields as $sub_field => $value) {
		$targets[ $field_name . ':' . $sub_field] = array(
        'name' => $module . " module: " . $field_name . '.' . t('!label', array('!label' => $value)),
        'callback' => 'location_feeds_set_target',
        'description' => t('The !label for the location of the node.', array('!label' => $sub_field)),
		);
	}
}

/**
 * Helper function to get to manage target fields
 *  
 * @return array of key/value field name/field label
 */
function _location_feeds_fields() {
	static $fields;
	if (isset($fields)) {
		return $fields;
	}

	$fields= location_field_names(TRUE);
	unset($fields['locpick']);
	$fields['locpick][user_latitude'] = t("Latitude");
	$fields['locpick][user_longitude'] = t("Longitude");

	// province_name / country_name / map_link are display fields
  unset($fields['province_name']);
  unset($fields['country_name']);
  unset($fields['map_link']);  

	return $fields;
}

/**
 * Implementation of feed_set_target
 *
 * @param object $node
 * @param string $target
 *   When targeting sub arrays the '][' is used to drill down.
 *   Note that this implementation is lazy ... we assume just depth=2
 * @param $value
 * @return object
 */
function location_feeds_set_target($node, $target, $value) {
	list($field_name, $sub_field) = split(':', $target);
	if (strpos($sub_field, '][') > 0) {
		// TODO : make this algorithm recursive.
		list($sub_field, $last_field) = split('\]\[', $sub_field, 2);
	}

	if (!is_array($value)) {
		$value = array($value);
	}

	foreach ($value as $i => $val) {
		if (isset($last_field)) {
			$node->{$field_name}[$i][$sub_field][$last_field] = $val;
		}
		else {
			$node->{$field_name}[$i][$sub_field] = $val;
		}
	}
	return $node;
}