<?php

namespace SilverStripe\ORM;

use Exception;

/**
 * Exception thrown by {@link DataObject}::write if validation fails. By throwing an
 * exception rather than a user error, the exception can be caught in unit tests and as such
 * can be used as a successful test.
 */
class ValidationException extends Exception
{

	/**
	 * The contained ValidationResult related to this error
	 *
	 * @var ValidationResult
	 */
	protected $result;

	/**
	 * Construct a new ValidationException with an optional ValidationResult object
	 *
	 * @param ValidationResult|string $result The ValidationResult containing the
	 * failed result. Can be substituted with an error message instead if no
	 * ValidationResult exists.
	 * @param string|integer $message The error message. If $result was given the
	 * message string rather than a ValidationResult object then this will have
	 * the error code number.
	 * @param integer $code The error code number, if not given in the second parameter
	 */
	public function __construct($result = null, $code = 0, $dummy = null) {
		$exceptionMessage = null;

		// Backwards compatibiliy failover.  The 2nd argument used to be $message, and $code the 3rd.
		// For callers using that, we ditch the message
		if(!is_numeric($code)) {
			$exceptionMessage = $code;
			if($dummy) $code = $dummy;
		}

		if($result instanceof ValidationResult) {
			$this->result = $result;

		} else if(is_string($result)) {
			$this->result = ValidationResult::create()->addError($result);

		} else if(!$result) {
			$this->result = ValidationResult::create()->addError(_t("ValdiationExcetpion.DEFAULT_ERROR", "Validation error"));

		} else {
			throw new InvalidArgumentException(
				"ValidationExceptions must be passed a ValdiationResult, a string, or nothing at all");
		}

		// Construct
		parent::__construct($exceptionMessage ? $exceptionMessage : $this->result->message(), $code);
	}

	/**
	 * Create a ValidationException with a message for a single field-specific error message.
	 *
	 * @param  string $field   The field name
	 * @param  string $message The error message
	 * @return ValidationException
	 */
	static function create_for_field($field, $message) {
		$result = new ValidationResult;
		$result->addFieldError($field, $message);
		return new ValidationException($result);
	}

	/**
	 * Retrieves the ValidationResult related to this error
	 *
	 * @return ValidationResult
	 */
    public function getResult()
    {
		return $this->result;
	}
}