<?php
/*
 +--------------------------------------------------------------------+
 | CiviCRM version 4.7                                                |
 +--------------------------------------------------------------------+
 | Copyright CiviCRM LLC (c) 2004-2017                                |
 +--------------------------------------------------------------------+
 | This file is a part of CiviCRM.                                    |
 |                                                                    |
 | CiviCRM is free software; you can copy, modify, and distribute it  |
 | under the terms of the GNU Affero General Public License           |
 | Version 3, 19 November 2007 and the CiviCRM Licensing Exception.   |
 |                                                                    |
 | CiviCRM is distributed in the hope that it will be useful, but     |
 | WITHOUT ANY WARRANTY; without even the implied warranty of         |
 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.               |
 | See the GNU Affero General Public License for more details.        |
 |                                                                    |
 | You should have received a copy of the GNU Affero General Public   |
 | License and the CiviCRM Licensing Exception along                  |
 | with this program; if not, contact CiviCRM LLC                     |
 | at info[AT]civicrm[DOT]org. If you have questions about the        |
 | GNU Affero General Public License or the licensing of CiviCRM,     |
 | see the CiviCRM license FAQ at http://civicrm.org/licensing        |
 +--------------------------------------------------------------------+
 */

/**
 *
 * @package CRM
 * @copyright CiviCRM LLC (c) 2004-2017
 * $Id$
 *
 */

/**
 *
 * @package CRM
 * @author Marshal Newrock <marshal@idealso.com>
 * $Id$
 */

/**
 * Business objects for Line Items generated by monetary transactions
 */
class CRM_Price_BAO_LineItem extends CRM_Price_DAO_LineItem {

  /**
   * Creates a new entry in the database.
   *
   * @param array $params
   *   (reference) an assoc array of name/value pairs.
   *
   * @return \CRM_Price_DAO_LineItem
   *
   * @throws \CiviCRM_API3_Exception
   * @throws \Exception
   */
  public static function create(&$params) {
    $id = CRM_Utils_Array::value('id', $params);
    if ($id) {
      CRM_Utils_Hook::pre('edit', 'LineItem', $id, $params);
      $op = CRM_Core_Action::UPDATE;
    }
    else {
      CRM_Utils_Hook::pre('create', 'LineItem', $params['entity_id'], $params);
      $op = CRM_Core_Action::ADD;
    }

    // unset entity table and entity id in $params
    // we never update the entity table and entity id during update mode
    if ($id) {
      $entity_id = CRM_Utils_Array::value('entity_id', $params);
      $entity_table = CRM_Utils_Array::value('entity_table', $params);
      unset($params['entity_id'], $params['entity_table']);
    }
    else {
      if (!isset($params['unit_price'])) {
        $params['unit_price'] = 0;
      }
    }
    if (CRM_Financial_BAO_FinancialType::isACLFinancialTypeStatus() && CRM_Utils_Array::value('check_permissions', $params)) {
      if (empty($params['financial_type_id'])) {
        throw new Exception('Mandatory key(s) missing from params array: financial_type_id');
      }
      CRM_Financial_BAO_FinancialType::getAvailableFinancialTypes($types, $op);
      if (!in_array($params['financial_type_id'], array_keys($types))) {
        throw new Exception('You do not have permission to create this line item');
      }
    }

    $lineItemBAO = new CRM_Price_BAO_LineItem();
    $lineItemBAO->copyValues($params);

    $return = $lineItemBAO->save();
    if ($lineItemBAO->entity_table == 'civicrm_membership' && $lineItemBAO->contribution_id && $lineItemBAO->entity_id) {
      $membershipPaymentParams = array(
        'membership_id' => $lineItemBAO->entity_id,
        'contribution_id' => $lineItemBAO->contribution_id,
      );
      if (!civicrm_api3('MembershipPayment', 'getcount', $membershipPaymentParams)) {
        civicrm_api3('MembershipPayment', 'create', $membershipPaymentParams);
      }
    }

    if ($id) {
      // CRM-21281: Restore entity reference in case the post hook needs it
      $lineItemBAO->entity_id = $entity_id;
      $lineItemBAO->entity_table = $entity_table;
      CRM_Utils_Hook::post('edit', 'LineItem', $id, $lineItemBAO);
    }
    else {
      CRM_Utils_Hook::post('create', 'LineItem', $lineItemBAO->id, $lineItemBAO);
    }

    return $return;
  }

  /**
   * Retrieve DB object based on input parameters.
   *
   * It also stores all the retrieved values in the default array.
   *
   * @param array $params
   *   (reference ) an assoc array of name/value pairs.
   * @param array $defaults
   *   (reference ) an assoc array to hold the flattened values.
   *
   * @return CRM_Price_BAO_LineItem
   */
  public static function retrieve(&$params, &$defaults) {
    $lineItem = new CRM_Price_BAO_LineItem();
    $lineItem->copyValues($params);
    if ($lineItem->find(TRUE)) {
      CRM_Core_DAO::storeValues($lineItem, $defaults);
      return $lineItem;
    }
    return NULL;
  }

  /**
   * Modifies $params array for filtering financial types.
   *
   * @param array $params
   *   (reference ) an assoc array of name/value pairs.
   *
   */
  public static function getAPILineItemParams(&$params) {
    CRM_Financial_BAO_FinancialType::getAvailableFinancialTypes($types);
    if ($types && empty($params['financial_type_id'])) {
      $params['financial_type_id'] = array('IN' => array_keys($types));
    }
    elseif ($types) {
      if (is_array($params['financial_type_id'])) {
        $invalidFts = array_diff($params['financial_type_id'], array_keys($types));
      }
      elseif (!in_array($params['financial_type_id'], array_keys($types))) {
        $invalidFts = $params['financial_type_id'];
      }
      if ($invalidFts) {
        $params['financial_type_id'] = array('NOT IN' => $invalidFts);
      }
    }
    else {
      $params['financial_type_id'] = 0;
    }
  }

  /**
   * @param int $contributionId
   *
   * @return null|string
   */
  public static function getLineTotal($contributionId) {
    $sqlLineItemTotal = "SELECT SUM(li.line_total + COALESCE(li.tax_amount,0))
FROM civicrm_line_item li
WHERE li.contribution_id = %1";
    $params = array(1 => array($contributionId, 'Integer'));
    $lineItemTotal = CRM_Core_DAO::singleValueQuery($sqlLineItemTotal, $params);
    return $lineItemTotal;
  }

  /**
   * Wrapper for line item retrieval when contribution ID is known.
   * @param int $contributionID
   *
   * @return array
   */
  public static function getLineItemsByContributionID($contributionID) {
    return self::getLineItems($contributionID, 'contribution', NULL, TRUE, TRUE, " WHERE contribution_id = " . (int) $contributionID);
  }

  /**
   * Given a participant id/contribution id,
   * return contribution/fee line items
   *
   * @param int $entityId
   *   participant/contribution id.
   * @param string $entity
   *   participant/contribution.
   *
   * @param bool $isQuick
   * @param bool $isQtyZero
   * @param bool $relatedEntity
   *
   * @param bool $invoice
   * @return array
   *   Array of line items
   */
  public static function getLineItems($entityId, $entity = 'participant', $isQuick = FALSE, $isQtyZero = TRUE, $relatedEntity = FALSE, $invoice = FALSE) {
    $whereClause = $fromClause = NULL;
    $selectClause = "
      SELECT    li.id,
      li.label,
      li.contribution_id,
      li.qty,
      li.unit_price,
      li.line_total,
      li.entity_table,
      li.entity_id,
      pf.label as field_title,
      pf.html_type,
      pf.price_set_id,
      pfv.membership_type_id,
      pfv.membership_num_terms,
      li.price_field_id,
      li.participant_count,
      li.price_field_value_id,
      li.financial_type_id,
      li.tax_amount,
      pfv.description";

    $condition = "li.entity_id = %2.id AND li.entity_table = 'civicrm_%2'";
    if ($relatedEntity) {
      $condition = "li.contribution_id = %2.id ";
    }

    $fromClause = "
      FROM      civicrm_%2 as %2
      LEFT JOIN civicrm_line_item li ON ({$condition})
      LEFT JOIN civicrm_price_field_value pfv ON ( pfv.id = li.price_field_value_id )
      LEFT JOIN civicrm_price_field pf ON (pf.id = li.price_field_id )";
    $whereClause = "
      WHERE     %2.id = %1";

    // CRM-16250 get additional participant's fee selection details only for invoice PDF (if any)
    if ($entity == 'participant' && $invoice) {
      $additionalParticipantIDs = CRM_Event_BAO_Participant::getAdditionalParticipantIds($entityId);
      if (!empty($additionalParticipantIDs)) {
        $whereClause = "WHERE %2.id IN (%1, " . implode(', ', $additionalParticipantIDs) . ")";
      }
    }

    $orderByClause = " ORDER BY pf.weight, pfv.weight";

    if ($isQuick) {
      $fromClause .= " LEFT JOIN civicrm_price_set cps on cps.id = pf.price_set_id ";
      $whereClause .= " and cps.is_quick_config = 0";
    }

    if (!$isQtyZero) {
      $whereClause .= " and li.qty != 0";
    }

    $lineItems = array();

    if (!$entityId || !$entity || !$fromClause) {
      return $lineItems;
    }

    $params = array(
      1 => array($entityId, 'Integer'),
      2 => array($entity, 'Text'),
    );

    $getTaxDetails = FALSE;
    $invoiceSettings = Civi::settings()->get('contribution_invoice_settings');
    $invoicing = CRM_Utils_Array::value('invoicing', $invoiceSettings);

    $dao = CRM_Core_DAO::executeQuery("$selectClause $fromClause $whereClause $orderByClause", $params);
    while ($dao->fetch()) {
      if (!$dao->id) {
        continue;
      }
      $lineItems[$dao->id] = array(
        'qty' => (float) $dao->qty,
        'label' => $dao->label,
        'unit_price' => $dao->unit_price,
        'line_total' => $dao->line_total,
        'price_field_id' => $dao->price_field_id,
        'participant_count' => $dao->participant_count,
        'price_field_value_id' => $dao->price_field_value_id,
        'field_title' => $dao->field_title,
        'html_type' => $dao->html_type,
        'description' => $dao->description,
        'entity_id' => $dao->entity_id,
        'entity_table' => $dao->entity_table,
        'contribution_id' => $dao->contribution_id,
        'financial_type_id' => $dao->financial_type_id,
        'financial_type' => CRM_Core_PseudoConstant::getLabel('CRM_Contribute_BAO_Contribution', 'financial_type_id', $dao->financial_type_id),
        'membership_type_id' => $dao->membership_type_id,
        'membership_num_terms' => $dao->membership_num_terms,
        'tax_amount' => $dao->tax_amount,
        'price_set_id' => $dao->price_set_id,
      );
      $taxRates = CRM_Core_PseudoConstant::getTaxRates();
      if (isset($lineItems[$dao->id]['financial_type_id']) && array_key_exists($lineItems[$dao->id]['financial_type_id'], $taxRates)) {
        // Cast to float so trailing zero decimals are removed for display.
        $lineItems[$dao->id]['tax_rate'] = (float) $taxRates[$lineItems[$dao->id]['financial_type_id']];
      }
      else {
        // There is no Tax Rate associated with this Financial Type
        $lineItems[$dao->id]['tax_rate'] = FALSE;
      }
      $lineItems[$dao->id]['subTotal'] = $lineItems[$dao->id]['qty'] * $lineItems[$dao->id]['unit_price'];
      if ($lineItems[$dao->id]['tax_amount'] != '') {
        $getTaxDetails = TRUE;
      }
    }
    if ($invoicing) {
      $taxTerm = CRM_Utils_Array::value('tax_term', $invoiceSettings);
      $smarty = CRM_Core_Smarty::singleton();
      $smarty->assign('taxTerm', $taxTerm);
      $smarty->assign('getTaxDetails', $getTaxDetails);
    }
    return $lineItems;
  }

  /**
   * This method will create the lineItem array required for
   * processAmount method
   *
   * @param int $fid
   *   Price set field id.
   * @param array $params
   *   Reference to form values.
   * @param array $fields
   *   Array of fields belonging to the price set used for particular event
   * @param array $values
   *   Reference to the values array(.
   *   this is
   *                          lineItem array)
   * @param string $amount_override
   *   Amount override must be in format 1000.00 - ie no thousand separator & if
   *   a decimal point is used it should be a decimal
   *
   * @todo - this parameter is only used for partial payments. It's unclear why a partial
   *  payment would change the line item price.
   */
  public static function format($fid, $params, $fields, &$values, $amount_override = NULL) {
    if (empty($params["price_{$fid}"])) {
      return;
    }

    //lets first check in fun parameter,
    //since user might modified w/ hooks.
    $options = array();
    if (array_key_exists('options', $fields)) {
      $options = $fields['options'];
    }
    else {
      CRM_Price_BAO_PriceFieldValue::getValues($fid, $options, 'weight', TRUE);
    }
    $fieldTitle = CRM_Utils_Array::value('label', $fields);
    if (!$fieldTitle) {
      $fieldTitle = CRM_Core_DAO::getFieldValue('CRM_Price_DAO_PriceField', $fid, 'label');
    }

    foreach ($params["price_{$fid}"] as $oid => $qty) {
      $price = $amount_override === NULL ? $options[$oid]['amount'] : $amount_override;

      $participantsPerField = CRM_Utils_Array::value('count', $options[$oid], 0);

      $values[$oid] = array(
        'price_field_id' => $fid,
        'price_field_value_id' => $oid,
        'label' => CRM_Utils_Array::value('label', $options[$oid]),
        'field_title' => $fieldTitle,
        'description' => CRM_Utils_Array::value('description', $options[$oid]),
        'qty' => $qty,
        'unit_price' => $price,
        'line_total' => $qty * $price,
        'participant_count' => $qty * $participantsPerField,
        'max_value' => CRM_Utils_Array::value('max_value', $options[$oid]),
        'membership_type_id' => CRM_Utils_Array::value('membership_type_id', $options[$oid]),
        'membership_num_terms' => CRM_Utils_Array::value('membership_num_terms', $options[$oid]),
        'auto_renew' => CRM_Utils_Array::value('auto_renew', $options[$oid]),
        'html_type' => $fields['html_type'],
        'financial_type_id' => CRM_Utils_Array::value('financial_type_id', $options[$oid]),
        'tax_amount' => CRM_Utils_Array::value('tax_amount', $options[$oid]),
        'non_deductible_amount' => CRM_Utils_Array::value('non_deductible_amount', $options[$oid]),
      );

      if ($values[$oid]['membership_type_id'] && empty($values[$oid]['auto_renew'])) {
        $values[$oid]['auto_renew'] = CRM_Core_DAO::getFieldValue('CRM_Member_DAO_MembershipType', $values[$oid]['membership_type_id'], 'auto_renew');
      }
    }
  }

  /**
   * Delete line items for given entity.
   *
   * @param int $entityId
   * @param int $entityTable
   *
   * @return bool
   */
  public static function deleteLineItems($entityId, $entityTable) {
    if (!$entityId || !$entityTable) {
      return FALSE;
    }

    if ($entityId && !is_array($entityId)) {
      $entityId = array($entityId);
    }

    $query = "DELETE FROM civicrm_line_item where entity_id IN ('" . implode("','", $entityId) . "') AND entity_table = '$entityTable'";
    $dao = CRM_Core_DAO::executeQuery($query);
    return TRUE;
  }

  /**
   * Process price set and line items.
   *
   * @param int $entityId
   * @param array $lineItem
   *   Line item array.
   * @param object $contributionDetails
   * @param string $entityTable
   *   Entity table.
   *
   * @param bool $update
   *
   * @return void
   */
  public static function processPriceSet($entityId, $lineItem, $contributionDetails = NULL, $entityTable = 'civicrm_contribution', $update = FALSE) {
    if (!$entityId || !is_array($lineItem)
      || CRM_Utils_system::isNull($lineItem)
    ) {
      return;
    }

    foreach ($lineItem as $priceSetId => &$values) {
      if (!$priceSetId) {
        continue;
      }

      foreach ($values as &$line) {
        if (empty($line['entity_table'])) {
          $line['entity_table'] = $entityTable;
        }
        if (empty($line['entity_id'])) {
          $line['entity_id'] = $entityId;
        }
        if (!empty($line['membership_type_id'])) {
          $line['entity_table'] = 'civicrm_membership';
        }
        if (!empty($contributionDetails->id)) {
          $line['contribution_id'] = $contributionDetails->id;
          if ($line['entity_table'] == 'civicrm_contribution') {
            $line['entity_id'] = $contributionDetails->id;
          }
          // CRM-19094: entity_table is set to civicrm_membership then ensure
          // the entityId is set to membership ID not contribution by default
          elseif ($line['entity_table'] == 'civicrm_membership' && !empty($line['entity_id']) && $line['entity_id'] == $contributionDetails->id) {
            $membershipId = CRM_Core_DAO::getFieldValue('CRM_Member_DAO_MembershipPayment', 'contribution_id', $line['entity_id'], 'membership_id');
            $line['entity_id'] = $membershipId ? $membershipId : $line['entity_id'];
          }
        }

        // if financial type is not set and if price field value is NOT NULL
        // get financial type id of price field value
        if (!empty($line['price_field_value_id']) && empty($line['financial_type_id'])) {
          $line['financial_type_id'] = CRM_Core_DAO::getFieldValue('CRM_Price_DAO_PriceFieldValue', $line['price_field_value_id'], 'financial_type_id');
        }
        $lineItems = CRM_Price_BAO_LineItem::create($line);
        if (!$update && $contributionDetails) {
          $financialItem = CRM_Financial_BAO_FinancialItem::add($lineItems, $contributionDetails);
          $line['financial_item_id'] = $financialItem->id;
          if (!empty($line['tax_amount'])) {
            CRM_Financial_BAO_FinancialItem::add($lineItems, $contributionDetails, TRUE);
          }
        }
      }
    }
    if (!$update && $contributionDetails) {
      CRM_Core_BAO_FinancialTrxn::createDeferredTrxn($lineItem, $contributionDetails);
    }
  }

  /**
   * @param int $entityId
   * @param string $entityTable
   * @param $amount
   * @param array $otherParams
   */
  public static function syncLineItems($entityId, $entityTable = 'civicrm_contribution', $amount, $otherParams = NULL) {
    if (!$entityId || CRM_Utils_System::isNull($amount)) {
      return;
    }

    $from = " civicrm_line_item li
      LEFT JOIN   civicrm_price_field pf ON pf.id = li.price_field_id
      LEFT JOIN   civicrm_price_set ps ON ps.id = pf.price_set_id ";

    $set = " li.unit_price = %3,
      li.line_total = %3 ";

    $where = " li.entity_id = %1 AND
      li.entity_table = %2 ";

    $params = array(
      1 => array($entityId, 'Integer'),
      2 => array($entityTable, 'String'),
      3 => array($amount, 'Float'),
    );

    if ($entityTable == 'civicrm_contribution') {
      $entityName = 'default_contribution_amount';
      $where .= " AND ps.name = %4 ";
      $params[4] = array($entityName, 'String');
    }
    elseif ($entityTable == 'civicrm_participant') {
      $from .= "
        LEFT JOIN civicrm_price_set_entity cpse ON cpse.price_set_id = ps.id
        LEFT JOIN civicrm_price_field_value cpfv ON cpfv.price_field_id = pf.id and cpfv.label = %4 ";
      $set .= " ,li.label = %4,
        li.price_field_value_id = cpfv.id ";
      $where .= " AND cpse.entity_table = 'civicrm_event' AND cpse.entity_id = %5 ";
      $amount = empty($amount) ? 0 : $amount;
      $params += array(
        4 => array($otherParams['fee_label'], 'String'),
        5 => array($otherParams['event_id'], 'String'),
      );
    }

    $query = "
      UPDATE $from
      SET    $set
      WHERE  $where
      ";

    CRM_Core_DAO::executeQuery($query, $params);
  }

  /**
   * Build line items array.
   *
   * @param array $params
   *   Form values.
   *
   * @param string $entityId
   *   Entity id.
   *
   * @param string $entityTable
   *   Entity Table.
   *
   * @param bool $isRelatedID
   */
  public static function getLineItemArray(&$params, $entityId = NULL, $entityTable = 'contribution', $isRelatedID = FALSE) {
    if (!$entityId) {
      $priceSetDetails = CRM_Price_BAO_PriceSet::getDefaultPriceSet($entityTable);
      $totalAmount = CRM_Utils_Array::value('partial_payment_total', $params, CRM_Utils_Array::value('total_amount', $params));
      $financialType = CRM_Utils_Array::value('financial_type_id', $params);
      foreach ($priceSetDetails as $values) {
        if ($entityTable == 'membership') {
          if ($isRelatedID != $values['membership_type_id']) {
            continue;
          }
          if (!$totalAmount) {
            $totalAmount = $values['amount'];
          }
          $financialType = $values['financial_type_id'];
        }
        $params['line_item'][$values['setID']][$values['priceFieldID']] = array(
          'price_field_id' => $values['priceFieldID'],
          'price_field_value_id' => $values['priceFieldValueID'],
          'label' => $values['label'],
          'qty' => 1,
          'unit_price' => $totalAmount,
          'line_total' => $totalAmount,
          'financial_type_id' => $financialType,
          'membership_type_id' => $values['membership_type_id'],
        );
        break;
      }
    }
    else {
      $setID = NULL;
      $totalEntityId = count($entityId);
      if ($entityTable == 'contribution') {
        $isRelatedID = TRUE;
      }
      foreach ($entityId as $id) {
        $lineItems = CRM_Price_BAO_LineItem::getLineItems($id, $entityTable, FALSE, TRUE, $isRelatedID);
        foreach ($lineItems as $key => $values) {
          if (!$setID && $values['price_field_id']) {
            $setID = CRM_Core_DAO::getFieldValue('CRM_Price_DAO_PriceField', $values['price_field_id'], 'price_set_id');
            $params['is_quick_config'] = CRM_Core_DAO::getFieldValue('CRM_Price_DAO_PriceSet', $setID, 'is_quick_config');
          }
          if (!empty($params['is_quick_config']) && array_key_exists('total_amount', $params)
            && $totalEntityId == 1
          ) {
            $values['line_total'] = $values['unit_price'] = $params['total_amount'];
          }
          $values['id'] = $key;
          $params['line_item'][$setID][$key] = $values;
        }
      }
    }
  }

  /**
   * Function to update related contribution of a entity and
   *  add/update/cancel financial records
   *
   * @param array $params
   * @param int $entityID
   * @param int $entity
   * @param int $contributionId
   * @param $feeBlock
   * @param array $lineItems
   * @param $paidAmount
   *
   */
  public static function changeFeeSelections(
    $params,
    $entityID,
    $entity,
    $contributionId,
    $feeBlock,
    $lineItems,
    $paidAmount
  ) {
    $entityTable = "civicrm_" . $entity;
    CRM_Price_BAO_PriceSet::processAmount($feeBlock,
      $params, $lineItems
    );
    // initialize empty Lineitem instance to call protected helper functions
    $lineItemObj = new CRM_Price_BAO_LineItem();

    // fetch submitted LineItems from input params and feeBlock information
    $submittedLineItems = $lineItemObj->_getSubmittedLineItems($params, $feeBlock);

    // retrieve the submitted price field value IDs from $submittedLineItems array keys
    $submittedPriceFieldValueIDs = empty($submittedLineItems) ? array() : array_keys($submittedLineItems);

    // get lineItems need to be updated and added to record changed fee
    list($lineItemsToAdd, $lineItemsToUpdate) = $lineItemObj->_getLineItemsToAddAndUpdate($submittedLineItems, $entityID, $entity);

    // cancel previous line item
    $additionalWhereClause = empty($submittedPriceFieldValueIDs) ? NULL : sprintf("price_field_value_id NOT IN (%s)", implode(', ', $submittedPriceFieldValueIDs));
    $lineItemObj->_cancelLineItems($entityID, $entityTable, $additionalWhereClause);

    // get financial information that need to be recorded on basis on submitted price field value IDs
    $financialItemsArray = $lineItemObj->_getFinancialItemsToRecord(
      $entityID,
      $entityTable,
      $contributionId,
      $submittedPriceFieldValueIDs
    );

    // update line item with changed line total and other information
    $totalParticipant = $participantCount = 0;
    $amountLevel = array();
    if (!empty($lineItemsToUpdate)) {
      foreach ($lineItemsToUpdate as $priceFieldValueID => $value) {
        $taxAmount = "NULL";
        if (isset($value['tax_amount'])) {
          $taxAmount = $value['tax_amount'];
        }
        $amountLevel[] = $value['label'] . ' - ' . (float) $value['qty'];
        if ($entity == 'participant' && isset($value['participant_count'])) {
          $participantCount = $value['participant_count'];
          $totalParticipant += $value['participant_count'];
        }
        $updateLineItemSQL = "
        UPDATE civicrm_line_item li
        SET li.qty = {$value['qty']},
            li.line_total = {$value['line_total']},
            li.tax_amount = {$taxAmount},
            li.unit_price = {$value['unit_price']},
            li.participant_count = {$participantCount},
            li.label = %1
      WHERE (li.entity_table = '{$entityTable}' AND li.entity_id = {$entityID}) AND
        (price_field_value_id = {$priceFieldValueID}) ";

        CRM_Core_DAO::executeQuery($updateLineItemSQL, array(1 => array($value['label'], 'String')));
      }
    }

    // insert new 'adjusted amount' transaction entry and update contribution entry.
    // ensure entity_financial_trxn table has a linking of it.
    // insert new line items
    $lineItemObj->_addLineItemOnChangeFeeSelection($lineItemsToAdd, $entityID, $entityTable, $contributionId);

    // the recordAdjustedAmt code would execute over here
    $count = 0;
    if ($entity == 'participant') {
      $count = count(CRM_Event_BAO_Participant::getParticipantIds($contributionId));
    }
    else {
      $count = CRM_Utils_Array::value('count', civicrm_api3('MembershipPayment', 'getcount', array('contribution_id' => $contributionId)));
    }
    if ($count > 1) {
      $updatedAmount = CRM_Price_BAO_LineItem::getLineTotal($contributionId);
    }
    else {
      $updatedAmount = CRM_Utils_Array::value('amount', $params, CRM_Utils_Array::value('total_amount', $params));
    }
    if (strlen($params['tax_amount']) != 0) {
      $taxAmount = $params['tax_amount'];
    }
    else {
      $taxAmount = "NULL";
    }
    $displayParticipantCount = '';
    if ($totalParticipant > 0) {
      $displayParticipantCount = ' Participant Count -' . $totalParticipant;
    }
    $updateAmountLevel = NULL;
    if (!empty($amountLevel)) {
      $updateAmountLevel = CRM_Core_DAO::VALUE_SEPARATOR . implode(CRM_Core_DAO::VALUE_SEPARATOR, $amountLevel) . $displayParticipantCount . CRM_Core_DAO::VALUE_SEPARATOR;
    }
    $trxn = $lineItemObj->_recordAdjustedAmt($updatedAmount, $paidAmount, $contributionId, $taxAmount, $updateAmountLevel);

    $contributionCompletedStatusID = CRM_Core_PseudoConstant::getKey('CRM_Contribute_DAO_Contribution', 'contribution_status_id', 'Completed');
    if (!empty($financialItemsArray)) {
      foreach ($financialItemsArray as $updateFinancialItemInfoValues) {
        $newFinancialItem = CRM_Financial_BAO_FinancialItem::create($updateFinancialItemInfoValues);
        // record reverse transaction only if Contribution is Completed because for pending refund or
        //   partially paid we are already recording the surplus owed or refund amount
        if (!empty($updateFinancialItemInfoValues['financialTrxn']) && ($contributionCompletedStatusID ==
          CRM_Core_DAO::getFieldValue('CRM_Contribute_DAO_Contribution', $contributionId, 'contribution_status_id'))
        ) {
          $updateFinancialItemInfoValues = array_merge($updateFinancialItemInfoValues['financialTrxn'], array(
            'entity_id' => $newFinancialItem->id,
            'entity_table' => 'civicrm_financial_item',
          ));
          $reverseTrxn = CRM_Core_BAO_FinancialTrxn::create($updateFinancialItemInfoValues);
          // record reverse entity financial trxn linked to membership's related contribution
          civicrm_api3('EntityFinancialTrxn', 'create', array(
            'entity_table' => "civicrm_contribution",
            'entity_id' => $contributionId,
            'financial_trxn_id' => $reverseTrxn->id,
            'amount' => $reverseTrxn->total_amount,
          ));
          unset($updateFinancialItemInfoValues['financialTrxn']);
        }
        if (!empty($updateFinancialItemInfoValues['tax'])) {
          $updateFinancialItemInfoValues['tax']['amount'] = $updateFinancialItemInfoValues['amount'];
          $updateFinancialItemInfoValues['tax']['description'] = $updateFinancialItemInfoValues['description'];
          if (!empty($updateFinancialItemInfoValues['financial_account_id'])) {
            $updateFinancialItemInfoValues['financial_account_id'] = $updateFinancialItemInfoValues['tax']['financial_account_id'];
          }
          CRM_Financial_BAO_FinancialItem::create($updateFinancialItemInfoValues);
        }
      }
    }

    $trxnId = array();
    if (!empty($trxn->id)) {
      $trxnId['id'] = $trxn->id;
    }
    $lineItemObj->_addLineItemOnChangeFeeSelection($lineItemsToAdd, $entityID, $entityTable, $contributionId, $trxnId, TRUE);

    // update participant fee_amount column
    $lineItemObj->_updateEntityRecordOnChangeFeeSelection($params, $entityID, $entity);
  }

  /**
   * Function to cancel Lineitem whose corrosponding price field option is
   *  unselected on membership or participant backoffice form
   *
   * @param int $entityID
   * @param string $entityTable
   * @param string $additionalWhereClause
   *
   */
  protected function _cancelLineItems($entityID, $entityTable, $additionalWhereClause = NULL) {
    $whereClauses = array(
      "li.entity_id = %1",
      "li.entity_table = %2",
    );
    if ($additionalWhereClause) {
      $whereClauses[] = $additionalWhereClause;
    }

    $where = implode(' AND ', $whereClauses);
    $sql = "
      UPDATE civicrm_line_item li
        INNER JOIN civicrm_financial_item fi ON (li.id = fi.entity_id AND fi.entity_table = 'civicrm_line_item')
      SET li.qty = 0,
        li.line_total = 0.00,
        li.tax_amount = NULL,
        li.participant_count = 0,
        li.non_deductible_amount = 0.00
      WHERE {$where} ";

    CRM_Core_DAO::executeQuery($sql, array(
      1 => array($entityID, 'Integer'),
      2 => array($entityTable, 'String'),
    ));
  }

  /**
   * Function to retrieve formatted financial items that need to be recorded as result of changed fee
   *
   * @param int $entityID
   * @param string $entityTable
   * @param int $contributionID
   * @param array $submittedPriceFieldValueIDs
   *
   * @return array
   *      List of formatted Financial Items to be recorded
   */
  protected function _getFinancialItemsToRecord($entityID, $entityTable, $contributionID, $submittedPriceFieldValueIDs) {
    $previousLineItems = CRM_Price_BAO_LineItem::getLineItems($entityID, str_replace('civicrm_', '', $entityTable));

    $financialItemsArray = array();

    if (empty($submittedPriceFieldValueIDs)) {
      return $financialItemsArray;
    }

    // gathering necessary info to record negative (deselected) financial_item
    $updateFinancialItem = "
  SELECT fi.*, SUM(fi.amount) as differenceAmt, price_field_value_id, financial_type_id, tax_amount
    FROM civicrm_financial_item fi LEFT JOIN civicrm_line_item li ON (li.id = fi.entity_id AND fi.entity_table = 'civicrm_line_item')
  WHERE (li.entity_table = '{$entityTable}' AND li.entity_id = {$entityID})
  GROUP BY li.entity_table, li.entity_id, price_field_value_id, fi.id
    ";
    $updateFinancialItemInfoDAO = CRM_Core_DAO::executeQuery($updateFinancialItem);

    $invoiceSettings = Civi::settings()->get('contribution_invoice_settings');
    $taxTerm = CRM_Utils_Array::value('tax_term', $invoiceSettings);
    $updateFinancialItemInfoValues = array();
    while ($updateFinancialItemInfoDAO->fetch()) {
      $updateFinancialItemInfoValues = (array) $updateFinancialItemInfoDAO;
      $updateFinancialItemInfoValues['transaction_date'] = date('YmdHis');
      // the below params are not needed
      $previousFinancialItemID = $updateFinancialItemInfoValues['id'];
      unset($updateFinancialItemInfoValues['id']);
      unset($updateFinancialItemInfoValues['created_date']);
      // if not submitted and difference is not 0 make it negative
      if (!in_array($updateFinancialItemInfoValues['price_field_value_id'], $submittedPriceFieldValueIDs) && $updateFinancialItemInfoValues['differenceAmt'] != 0) {
        // INSERT negative financial_items
        $updateFinancialItemInfoValues['amount'] = -$updateFinancialItemInfoValues['amount'];
        // reverse the related financial trxn too
        $updateFinancialItemInfoValues['financialTrxn'] = $this->_getRelatedCancelFinancialTrxn($previousFinancialItemID);
        if ($previousLineItems[$updateFinancialItemInfoValues['entity_id']]['tax_amount']) {
          $updateFinancialItemInfoValues['tax']['amount'] = -($previousLineItems[$updateFinancialItemInfoValues['entity_id']]['tax_amount']);
          $updateFinancialItemInfoValues['tax']['description'] = $taxTerm;
          if ($updateFinancialItemInfoValues['financial_type_id']) {
            $updateFinancialItemInfoValues['tax']['financial_account_id'] = CRM_Contribute_BAO_Contribution::getFinancialAccountId($updateFinancialItemInfoValues['financial_type_id']);
          }
        }
        // INSERT negative financial_items for tax amount
        $financialItemsArray[] = $updateFinancialItemInfoValues;
      }
      // if submitted and difference is 0 add a positive entry again
      elseif (in_array($updateFinancialItemInfoValues['price_field_value_id'], $submittedPriceFieldValueIDs) && $updateFinancialItemInfoValues['differenceAmt'] == 0) {
        $updateFinancialItemInfoValues['amount'] = $updateFinancialItemInfoValues['amount'];
        // INSERT financial_items for tax amount
        if ($updateFinancialItemInfoValues['entity_id'] == $lineItemsToUpdate[$updateFinancialItemInfoValues['price_field_value_id']]['id'] &&
          isset($lineItemsToUpdate[$updateFinancialItemInfoValues['price_field_value_id']]['tax_amount'])
        ) {
          $updateFinancialItemInfoValues['tax']['amount'] = $lineItemsToUpdate[$updateFinancialItemInfoValues['price_field_value_id']]['tax_amount'];
          $updateFinancialItemInfoValues['tax']['description'] = $taxTerm;
          if ($lineItemsToUpdate[$updateFinancialItemInfoValues['price_field_value_id']]['financial_type_id']) {
            $updateFinancialItemInfoValues['tax']['financial_account_id'] = CRM_Contribute_BAO_Contribution::getFinancialAccountId($lineItemsToUpdate[$updateFinancialItemInfoValues['price_field_value_id']]['financial_type_id']);
          }
        }
        $financialItemsArray[] = $updateFinancialItemInfoValues;
      }
    }

    return $financialItemsArray;
  }

  /**
   * Helper function to retrieve submitted line items from form values $inputParams and used $feeBlock
   *
   * @param array $inputParams
   * @param array $feeBlock
   *
   * @return array
   *     List of submitted line items
   */
  protected function _getSubmittedLineItems($inputParams, $feeBlock) {
    $submittedLineItems = array();
    foreach ($feeBlock as $id => $values) {
      CRM_Price_BAO_LineItem::format($id, $inputParams, $values, $submittedLineItems);
    }

    return $submittedLineItems;
  }

  /**
   * Helper function to retrieve formatted lineitems need to be added and/or updated
   *
   * @param array $submittedLineItems
   * @param int $entityID
   * @param string $entity
   *
   * @return array
   *    Array of formatted lineitems
   */
  protected function _getLineItemsToAddAndUpdate($submittedLineItems, $entityID, $entity) {
    $previousLineItems = CRM_Price_BAO_LineItem::getLineItems($entityID, $entity);

    $lineItemsToAdd = $submittedLineItems;
    $lineItemsToUpdate = array();
    $submittedPriceFieldValueIDs = array_keys($submittedLineItems);

    foreach ($previousLineItems as $id => $previousLineItem) {
      // check through the submitted items if the previousItem exists,
      // if found in submitted items, do not use it for new item creations
      if (in_array($previousLineItem['price_field_value_id'], $submittedPriceFieldValueIDs)) {
        // if submitted line items are existing don't fire INSERT query
        if ($previousLineItem['line_total'] != 0) {
          unset($lineItemsToAdd[$previousLineItem['price_field_value_id']]);
        }
        else {
          $lineItemsToAdd[$previousLineItem['price_field_value_id']]['skip'] = TRUE;
        }
        // for updating the line items i.e. use-case - once deselect-option selecting again
        if (($previousLineItem['line_total'] != $submittedLineItems[$previousLineItem['price_field_value_id']]['line_total']) ||
          ($submittedLineItems[$previousLineItem['price_field_value_id']]['line_total'] == 0 && $submittedLineItems[$previousLineItem['price_field_value_id']]['qty'] == 1) ||
          ($previousLineItem['qty'] != $submittedLineItems[$previousLineItem['price_field_value_id']]['qty'])
        ) {
          $lineItemsToUpdate[$previousLineItem['price_field_value_id']] = $submittedLineItems[$previousLineItem['price_field_value_id']];
          $lineItemsToUpdate[$previousLineItem['price_field_value_id']]['id'] = $id;
        }
      }
    }

    return array($lineItemsToAdd, $lineItemsToUpdate);
  }

  /**
   * Helper function to add lineitems or financial item related to it, to as result of fee change
   *
   * @param array $lineItemsToAdd
   * @param int $entityID
   * @param string $entityTable
   * @param int $contributionID
   * @param array $adjustedFinancialTrxnID
   * @param bool $addFinancialItemOnly
   *
   * @return void
   */
  protected function _addLineItemOnChangeFeeSelection(
    $lineItemsToAdd,
    $entityID,
    $entityTable,
    $contributionID,
    $adjustedFinancialTrxnID = NULL,
    $addFinancialItemOnly = FALSE
  ) {
    // if there is no line item to add, do not proceed
    if (empty($lineItemsToAdd)) {
      return;
    }

    $changedFinancialTypeID = NULL;
    $fetchCon = array('id' => $contributionID);
    $updatedContribution = CRM_Contribute_BAO_Contribution::retrieve($fetchCon, CRM_Core_DAO::$_nullArray, CRM_Core_DAO::$_nullArray);
    // insert financial items
    foreach ($lineItemsToAdd as $priceFieldValueID => $lineParams) {
      $tempFinancialTrxnID = $adjustedFinancialTrxnID;
      $lineParams = array_merge($lineParams, array(
        'entity_table' => $entityTable,
        'entity_id' => $entityID,
        'contribution_id' => $contributionID,
      ));
      if ($addFinancialItemOnly) {
        // don't add financial item for cancelled line item
        if ($lineParams['qty'] == 0) {
          continue;
        }
        elseif (empty($adjustedFinancialTrxnID)) {
          // add financial item if ONLY financial type is changed
          if ($lineParams['financial_type_id'] != $updatedContribution->financial_type_id) {
            $changedFinancialTypeID = $lineParams['financial_type_id'];
            $adjustedTrxnValues = array(
              'from_financial_account_id' => NULL,
              'to_financial_account_id' => CRM_Financial_BAO_FinancialTypeAccount::getInstrumentFinancialAccount($updatedContribution->payment_instrument_id),
              'total_amount' => $lineParams['line_total'],
              'net_amount' => $lineParams['line_total'],
              'status_id' => $updatedContribution->contribution_status_id,
              'payment_instrument_id' => $updatedContribution->payment_instrument_id,
              'contribution_id' => $updatedContribution->id,
              'is_payment' => TRUE, // since balance is 0, which means contribution is completed
              'trxn_date' => date('YmdHis'),
              'currency' => $updatedContribution->currency,
            );
            $adjustedTrxn = CRM_Core_BAO_FinancialTrxn::create($adjustedTrxnValues);
            $tempFinancialTrxnID = array('id' => $adjustedTrxn->id);
          }
          // don't add financial item if line_total and financial type aren't changed,
          //  which is identified by empty $adjustedFinancialTrxnID
          else {
            continue;
          }
        }
        $lineObj = CRM_Price_BAO_LineItem::retrieve($lineParams, CRM_Core_DAO::$_nullArray);
        // insert financial items
        // ensure entity_financial_trxn table has a linking of it.
        CRM_Financial_BAO_FinancialItem::add($lineObj, $updatedContribution, NULL, $tempFinancialTrxnID);
        if (isset($lineObj->tax_amount)) {
          CRM_Financial_BAO_FinancialItem::add($lineObj, $updatedContribution, TRUE, $tempFinancialTrxnID);
        }
      }
      elseif (!array_key_exists('skip', $lineParams)) {
        self::create($lineParams);
      }
    }

    if ($changedFinancialTypeID) {
      $updatedContribution->financial_type_id = $changedFinancialTypeID;
      $updatedContribution->save();
    }
  }

  /**
   * Helper function to update entity record on change fee selection
   *
   * @param array $inputParams
   * @param int $entityID
   * @param string $entity
   *
   */
  protected function _updateEntityRecordOnChangeFeeSelection($inputParams, $entityID, $entity) {
    $entityTable = "civicrm_{$entity}";

    if ($entity == 'participant') {
      $partUpdateFeeAmt = array('id' => $entityID);
      $getUpdatedLineItems = "SELECT *
        FROM civicrm_line_item
        WHERE (entity_table = '{$entityTable}' AND entity_id = {$entityID} AND qty > 0)";
      $getUpdatedLineItemsDAO = CRM_Core_DAO::executeQuery($getUpdatedLineItems);
      $line = array();
      while ($getUpdatedLineItemsDAO->fetch()) {
        $line[$getUpdatedLineItemsDAO->price_field_value_id] = $getUpdatedLineItemsDAO->label . ' - ' . (float) $getUpdatedLineItemsDAO->qty;
      }

      $partUpdateFeeAmt['fee_level'] = implode(', ', $line);
      $partUpdateFeeAmt['fee_amount'] = $inputParams['amount'];
      CRM_Event_BAO_Participant::add($partUpdateFeeAmt);

      //activity creation
      CRM_Event_BAO_Participant::addActivityForSelection($entityID, 'Change Registration');
    }
  }

  /**
   * Helper function to retrieve financial trxn parameters to reverse
   *  for given financial item identified by $financialItemID
   *
   * @param int $financialItemID
   *
   * @return array $financialTrxn
   *
   */
  protected function _getRelatedCancelFinancialTrxn($financialItemID) {
    $financialTrxn = civicrm_api3('EntityFinancialTrxn', 'getsingle', array(
      'entity_table' => 'civicrm_financial_item',
      'entity_id' => $financialItemID,
      'options' => array(
        'sort' => 'id DESC',
        'limit' => 1,
      ),
      'api.FinancialTrxn.getsingle' => array(
        'id' => "\$value.financial_trxn_id",
      ),
    ));

    $financialTrxn = array_merge($financialTrxn['api.FinancialTrxn.getsingle'], array(
      'trxn_date' => date('YmdHis'),
      'total_amount' => -$financialTrxn['api.FinancialTrxn.getsingle']['total_amount'],
      'net_amount' => -$financialTrxn['api.FinancialTrxn.getsingle']['net_amount'],
      'entity_table' => 'civicrm_financial_item',
      'entity_id' => $financialItemID,
    ));
    unset($financialTrxn['id']);

    return $financialTrxn;
  }

  /**
   * Record adjusted amount.
   *
   * @param int $updatedAmount
   * @param int $paidAmount
   * @param int $contributionId
   *
   * @param int $taxAmount
   * @param bool $updateAmountLevel
   *
   * @return bool|\CRM_Core_BAO_FinancialTrxn
   */
  protected function _recordAdjustedAmt($updatedAmount, $paidAmount, $contributionId, $taxAmount = NULL, $updateAmountLevel = NULL) {
    $pendingAmount = CRM_Core_BAO_FinancialTrxn::getBalanceTrxnAmt($contributionId);
    $pendingAmount = CRM_Utils_Array::value('total_amount', $pendingAmount, 0);
    $balanceAmt = $updatedAmount - $paidAmount;
    if ($paidAmount != $pendingAmount) {
      $balanceAmt -= $pendingAmount;
    }

    $contributionStatuses = CRM_Contribute_PseudoConstant::contributionStatus(NULL, 'name');
    $partiallyPaidStatusId = array_search('Partially paid', $contributionStatuses);
    $pendingRefundStatusId = array_search('Pending refund', $contributionStatuses);
    $completedStatusId = array_search('Completed', $contributionStatuses);

    $updatedContributionDAO = new CRM_Contribute_BAO_Contribution();
    $adjustedTrxn = $skip = FALSE;
    if ($balanceAmt) {
      if ($balanceAmt > 0 && $paidAmount != 0) {
        $contributionStatusVal = $partiallyPaidStatusId;
      }
      elseif ($balanceAmt < 0 && $paidAmount != 0) {
        $contributionStatusVal = $pendingRefundStatusId;
      }
      elseif ($paidAmount == 0) {
        //skip updating the contribution status if no payment is made
        $skip = TRUE;
        $updatedContributionDAO->cancel_date = 'null';
        $updatedContributionDAO->cancel_reason = NULL;
      }
      // update contribution status and total amount without trigger financial code
      // as this is handled in current BAO function used for change selection
      $updatedContributionDAO->id = $contributionId;
      if (!$skip) {
        $updatedContributionDAO->contribution_status_id = $contributionStatusVal;
      }
      $updatedContributionDAO->total_amount = $updatedContributionDAO->net_amount = $updatedAmount;
      $updatedContributionDAO->fee_amount = 0;
      $updatedContributionDAO->tax_amount = $taxAmount;
      if (!empty($updateAmountLevel)) {
        $updatedContributionDAO->amount_level = $updateAmountLevel;
      }
      $updatedContributionDAO->save();
      // adjusted amount financial_trxn creation
      $updatedContribution = CRM_Contribute_BAO_Contribution::getValues(
        array('id' => $contributionId),
        CRM_Core_DAO::$_nullArray,
        CRM_Core_DAO::$_nullArray
      );
      $toFinancialAccount = CRM_Contribute_PseudoConstant::getRelationalFinancialAccount($updatedContribution->financial_type_id, 'Accounts Receivable Account is');
      $adjustedTrxnValues = array(
        'from_financial_account_id' => NULL,
        'to_financial_account_id' => $toFinancialAccount,
        'total_amount' => $balanceAmt,
        'net_amount' => $balanceAmt,
        'status_id' => $completedStatusId,
        'payment_instrument_id' => $updatedContribution->payment_instrument_id,
        'contribution_id' => $updatedContribution->id,
        'trxn_date' => date('YmdHis'),
        'currency' => $updatedContribution->currency,
      );
      $adjustedTrxn = CRM_Core_BAO_FinancialTrxn::create($adjustedTrxnValues);
    }
    return $adjustedTrxn;
  }

}