<?php
/*
 +--------------------------------------------------------------------+
 | Copyright CiviCRM LLC. All rights reserved.                        |
 |                                                                    |
 | This work is published under the GNU AGPLv3 license with some      |
 | permitted exceptions and without any warranty. For full license    |
 | and copyright information, see https://civicrm.org/licensing       |
 +--------------------------------------------------------------------+
 */

/**
 * This api exposes CiviCRM participant.
 *
 * @package CiviCRM_APIv3
 */

/**
 * Create an Event Participant.
 *
 * @param array $params
 *   An associative array of name/value property values of civicrm_participant.
 *
 * @return array
 *   API result array
 *
 * @throws \CiviCRM_API3_Exception
 * @throws \CRM_Core_Exception
 */
function civicrm_api3_participant_create($params) {
  // Check that event id is not an template - should be done @ BAO layer.
  if (!empty($params['event_id'])) {
    $isTemplate = CRM_Core_DAO::getFieldValue('CRM_Event_DAO_Event', $params['event_id'], 'is_template');
    if (!empty($isTemplate)) {
      return civicrm_api3_create_error(ts('Event templates are not meant to be registered.'));
    }
  }

  $values = $participant = [];
  _civicrm_api3_custom_format_params($params, $values, 'Participant');
  $params = array_merge($values, $params);

  $participantBAO = CRM_Event_BAO_Participant::create($params);

  if (empty($params['price_set_id']) && empty($params['id']) && !empty($params['fee_level'])) {
    _civicrm_api3_participant_createlineitem($params, $participantBAO);
  }
  _civicrm_api3_object_to_array($participantBAO, $participant[$participantBAO->id]);

  return civicrm_api3_create_success($participant, $params, 'Participant', 'create', $participantBAO);
}

/**
 * Create a default participant line item.
 *
 * @todo this should be done in the BAO not the api
 *
 * @param array $params
 * @param $participant
 *
 * @throws \CiviCRM_API3_Exception
 */
function _civicrm_api3_participant_createlineitem(&$params, $participant) {
  // it is possible that a fee level contains information about multiple
  // price field values.

  $priceFieldValueDetails = CRM_Utils_Array::explodePadded(
    $params["fee_level"]);

  foreach ($priceFieldValueDetails as $detail) {
    if (preg_match('/- ([0-9]+)$/', $detail, $matches)) {
      // it is possible that a price field value is payd for multiple times.
      // (FIXME: if the price field value ends in minus followed by whitespace
      // and a number, things will go wrong.)

      $qty = $matches[1];
      preg_match('/^(.*) - [0-9]+$/', $detail, $matches);
      $label = $matches[1];
    }
    else {
      $label = $detail;
      $qty = 1;
    }

    $sql = "
      SELECT      ps.id AS setID, pf.id AS priceFieldID, pfv.id AS priceFieldValueID, pfv.amount AS amount
      FROM  civicrm_price_set_entity cpse
      LEFT JOIN civicrm_price_set ps ON cpse.price_set_id = ps.id AND cpse.entity_id = %1 AND cpse.entity_table = 'civicrm_event'
      LEFT JOIN   civicrm_price_field pf ON pf.`price_set_id` = ps.id
      LEFT JOIN   civicrm_price_field_value pfv ON pfv.price_field_id = pf.id
      where ps.id is not null and pfv.label = %2
    ";

    $qParams = [
      1 => [$params['event_id'], 'Integer'],
      2 => [$label, 'String'],
    ];

    $dao = CRM_Core_DAO::executeQuery($sql, $qParams);
    if ($dao->fetch()) {
      $lineItemParams = [
        'price_field_id' => $dao->priceFieldID,
        'price_field_value_id' => $dao->priceFieldValueID,
        'entity_table' => 'civicrm_participant',
        'entity_id' => $participant->id,
        'label' => $label,
        'qty' => $qty,
        'participant_count' => 0,
        'unit_price' => $dao->amount,
        'line_total' => $qty * $dao->amount,
      ];
      civicrm_api3('line_item', 'create', $lineItemParams);
    }

  }
}

/**
 * Adjust Metadata for Create action.
 *
 * The metadata is used for setting defaults, documentation & validation.
 *
 * @param array $params
 *   Array of parameters determined by getfields.
 */
function _civicrm_api3_participant_create_spec(&$params) {
  $params['status_id']['api.default'] = "1";
  $params['register_date']['api.default'] = "now";
  $params['event_id']['api.required'] = 1;
  $params['contact_id']['api.required'] = 1;
  // These are for the sake of search builder options - can be removed if that is fixed
  $params['role_id']['api.aliases'] = ['participant_role'];
  $params['status_id']['api.aliases'] = ['participant_status'];
}

/**
 * Retrieve a specific participant, given a set of input params.
 *
 * @param array $params
 *   input parameters.
 *
 * @return array
 *   array of properties, if error an array with an error id and error message
 */
function civicrm_api3_participant_get($params) {
  $mode = CRM_Contact_BAO_Query::MODE_EVENT;

  list($dao, $query) = _civicrm_api3_get_query_object($params, $mode, 'Participant');

  $participant = [];
  while ($dao->fetch()) {
    $query->convertToPseudoNames($dao, FALSE, TRUE);
    $participant[$dao->participant_id] = $query->store($dao);
    //@todo - is this required - contribution & pledge use the same query but don't self-retrieve custom data
    _civicrm_api3_custom_data_get($participant[$dao->participant_id], CRM_Utils_Array::value('check_permissions', $params), 'Participant', $dao->participant_id, NULL);
  }

  return civicrm_api3_create_success($participant, $params, 'Participant', 'get', $dao);
}

/**
 * Adjust Metadata for Get action.
 *
 * The metadata is used for setting defaults, documentation & validation.
 *
 * @param array $params
 *   Array of parameters determined by getfields.
 */
function _civicrm_api3_participant_get_spec(&$params) {
  $params['participant_test'] = [
    'api.default' => 0,
    'title' => 'Get Test Participants',
    'type' => CRM_Utils_Type::T_BOOLEAN,
  ];
}

/**
 * Deletes an existing contact participant.
 *
 * This API is used for deleting a contact participant
 *
 * @param array $params
 *   Array containing Id of the contact participant to be deleted.
 *
 * @throws Exception
 * @return array
 */
function civicrm_api3_participant_delete($params) {

  $result = CRM_Event_BAO_Participant::deleteParticipant($params['id']);

  if ($result) {
    return civicrm_api3_create_success();
  }
  else {
    throw new Exception('Error while deleting participant');
  }
}