<?php
/**
 * @author Jaap Jansma <jaap.jansma@civicoop.org>
 * @license AGPL-3.0
 */


namespace Civi\DataProcessor\FieldOutputHandler;

use Civi\DataProcessor\Exception\DataSourceNotFoundException;
use Civi\DataProcessor\Exception\FieldNotFoundException;
use CRM_Dataprocessor_ExtensionUtil as E;
use Civi\DataProcessor\Source\SourceInterface;
use Civi\DataProcessor\DataSpecification\FieldSpecification;

class AbstractSimpleFieldOutputHandler extends AbstractFieldOutputHandler {

  /**
   * @var \Civi\DataProcessor\DataSpecification\FieldSpecification
   */
  protected $inputFieldSpec;

  /**
   * @var \Civi\DataProcessor\DataSpecification\FieldSpecification
   */
  protected $outputFieldSpec;

  /**
   * @var SourceInterface
   */
  protected $dataSource;

  /**
   * @return \Civi\DataProcessor\DataSpecification\FieldSpecification
   */
  public function getOutputFieldSpecification() {
    return $this->outputFieldSpec;
  }

  /**
   * @return \Civi\DataProcessor\DataSpecification\FieldSpecification
   */
  public function getInputFieldSpecification() {
    return $this->inputFieldSpec;
  }

  /**
   * @return \Civi\DataProcessor\Source\SourceInterface
   */
  public function getDataSource() {
    return $this->dataSource;
  }

  /**
   * Returns the data type of this field
   *
   * @return String
   */
  protected function getType() {
    return $this->inputFieldSpec->type;
  }

  /**
   * Initialize the processor
   *
   * @param String $alias
   * @param String $title
   * @param array $configuration
   * @param \Civi\DataProcessor\ProcessorType\AbstractProcessorType $processorType
   */
  public function initialize($alias, $title, $configuration) {
    [$this->dataSource, $this->inputFieldSpec] = $this->initializeField($configuration['field'], $configuration['datasource'], $alias);
    $this->outputFieldSpec = clone $this->inputFieldSpec;
    $this->outputFieldSpec->alias = $alias;
    $this->outputFieldSpec->title = $title;
    $this->outputFieldSpec->type = $this->getType();
  }

  /**
   * Returns the formatted value
   *
   * @param $rawRecord
   * @param $formattedRecord
   *
   * @return \Civi\DataProcessor\FieldOutputHandler\FieldOutput
   */
  public function formatField($rawRecord, $formattedRecord) {
    $rawValue = $rawRecord[$this->inputFieldSpec->alias] ?? '';
    $formattedValue = $rawRecord[$this->inputFieldSpec->alias] ?? '';
    if (strpos($formattedValue, \CRM_Core_DAO::VALUE_SEPARATOR) !== false) {
      $formattedValue = explode(\CRM_Core_DAO::VALUE_SEPARATOR, trim($formattedValue,\CRM_Core_DAO::VALUE_SEPARATOR));
      $formattedValue = implode(",", $formattedValue);
    }
    $output = new FieldOutput($rawValue);
    $output->formattedValue = $formattedValue;
    return $output;
  }

  /**
   * Returns true when this handler has additional configuration.
   *
   * @return bool
   */
  public function hasConfiguration() {
    return true;
  }

  /**
   * When this handler has additional configuration you can add
   * the fields on the form with this function.
   *
   * @param \CRM_Core_Form $form
   * @param array $field
   */
  public function buildConfigurationForm(\CRM_Core_Form $form, $field=array()) {
    $fieldSelect = $this->getFieldOptions($field['data_processor_id']);

    $form->add('select', 'field', $this->getFieldTitle(), $fieldSelect, true, array(
      'style' => 'min-width:250px',
      'class' => 'crm-select2 huge data-processor-field-for-name',
      'placeholder' => E::ts('- select -'),
    ));
    if (isset($field['configuration'])) {
      $configuration = $field['configuration'];
      $defaults = array();
      if (isset($configuration['field']) && isset($configuration['datasource'])) {
        $defaults['field'] = \CRM_Dataprocessor_Utils_DataSourceFields::getSelectedFieldValue($field['data_processor_id'], $configuration['datasource'], $configuration['field']);
      }
      $form->setDefaults($defaults);
    }
  }

  /**
   * When this handler has configuration specify the template file name
   * for the configuration form.
   *
   * @return false|string
   */
  public function getConfigurationTemplateFileName() {
    return "CRM/Dataprocessor/Form/Field/Configuration/SimpleFieldOutputHandler.tpl";
  }


  /**
   * Process the submitted values and create a configuration array
   *
   * @param $submittedValues
   * @return array
   */
  public function processConfiguration($submittedValues) {
    [$datasource, $field] = explode('::', $submittedValues['field'], 2);
    $configuration['field'] = $field;
    $configuration['datasource'] = $datasource;
    return $configuration;
  }

  /**
   * Returns all possible fields
   *
   * @param $data_processor_id
   *
   * @return array
   * @throws \Exception
   */
  protected function getFieldOptions($data_processor_id) {
    $fieldSelect = \CRM_Dataprocessor_Utils_DataSourceFields::getAvailableFieldsInDataSources($data_processor_id, array($this, 'isFieldValid'));
    return $fieldSelect;
  }

  /**
   * Callback function for determining whether this field could be handled by this output handler.
   *
   * @param \Civi\DataProcessor\DataSpecification\FieldSpecification $field
   * @return bool
   */
  public function isFieldValid(FieldSpecification $field) {
    return true;
  }

  /**
   * Returns the label of the field for selecting a field.
   *
   * This could be override in a child class.
   *
   * @return string
   */
  protected function getFieldTitle() {
    return E::ts('Field');
  }


}
