<?php

class CRM_CivirulesConditions_Contact_CustomFieldChanged extends CRM_Civirules_Condition {

  private $_conditionParams = [];

  /**
   * Method to set the Rule Condition data
   *
   * @param array $ruleCondition
   * @access public
   */
  public function setRuleConditionData($ruleCondition) {
    parent::setRuleConditionData($ruleCondition);
    $this->_conditionParams = [];
    if (!empty($this->ruleCondition['condition_params'])) {
      $this->_conditionParams = unserialize($this->ruleCondition['condition_params']);
    }
  }

  /**
   * Method to determine if the condition is valid
   *
   * @param CRM_Civirules_TriggerData_TriggerData $triggerData
   * @return bool
   */
  public function isConditionValid(CRM_Civirules_TriggerData_TriggerData $triggerData) {
    $isConditionValid = FALSE;
    // if condition custom field not in entity data, return false
    $contactData = $triggerData->getEntityData('Contact');
    if ($contactData) {
      $appears = FALSE;
      foreach ($this->_conditionParams['custom_field_id'] as $customFieldId) {
        $element = "custom_" . $customFieldId;
        if (isset($contactData[$element])) {
          $appears = TRUE;
        }
      }
      if ($appears) {
        // return true if field changed
        $isConditionValid = $this->hasFieldChanged($triggerData->getOriginalData(), $contactData);
      }
    }
    return $isConditionValid;
  }

  /**
   * Method to determine if one of the condition fields has changed
   *
   * @param $originalData
   * @param $caseData
   * @return bool
   */
  private function hasFieldChanged($originalData, $contactData) {
    foreach ($this->_conditionParams['custom_field_id'] as $customFieldId) {
      $element = "custom_" . $customFieldId;
      // changed if new value but no original value
      if (isset($contactData[$element]) && !isset($originalData[$element])) {
        return TRUE;
      }
      // changed if new value not equal old value
      if (isset($contactData[$element]) && isset($originalData[$element])) {
        if ($contactData[$element] != $originalData[$element]) {
          return TRUE;
        }
      }
    }
    return FALSE;
  }

  /**
   * Returns a redirect url to extra data input from the user after adding a condition
   *
   * Return false if you do not need extra data input
   *
   * @param int $ruleConditionId
   * @return bool|string
   * @access public
   * @abstract
   */
  public function getExtraDataInputUrl($ruleConditionId) {
    return CRM_Utils_System::url('civicrm/civirule/form/condition/contactcustomfield', 'rule_condition_id='
      . $ruleConditionId);
  }

  /**
   * Returns a user friendly text explaining the condition params
   * e.g. 'Older than 65'
   *
   * @return string
   * @access public
   */
  public function userFriendlyConditionParams() {
    $friendlyText = 'Changed Contact Custom Field is one of: ';
    $fields = [];
    try {
      $result = civicrm_api3('CustomField', 'get', [
        'sequential' => 1,
        'return' => ["label"],
        'id' => ['IN' => $this->_conditionParams['custom_field_id']],
      ]);
      foreach ($result['values'] as $customField) {
        $fields[] = $customField['label'];
      }
      $friendlyText .= implode(",", $fields);
    }
    catch (CiviCRM_API3_Exception $ex) {
    }
    return $friendlyText;
  }

  /**
   * This function validates whether this condition works with the selected trigger.
   *
   * This function could be overriden in child classes to provide additional validation
   * whether a condition is possible in the current setup. E.g. we could have a condition
   * which works on contribution or on contributionRecur then this function could do
   * this kind of validation and return false/true
   *
   * @param CRM_Civirules_Trigger $trigger
   * @param CRM_Civirules_BAO_Rule $rule
   * @return bool
   */
  public function doesWorkWithTrigger(CRM_Civirules_Trigger $trigger, CRM_Civirules_BAO_Rule $rule) {
    if ($trigger instanceof CRM_CivirulesPostTrigger_ContactCustomDataChanged) {
      return TRUE;
    }
    return FALSE;
  }

}