<?php

namespace ByJG\AnyDataset\Core;

use Closure;

class RowValidator
{
	const REQUIRED = "required";
	const NUMBER = "number";
	const REGEX = "regex";
	const CUSTOM = "custom";

	/** @var array */
	protected $fieldValidator = [];


	/**
	 * @param string|array $fieldList
	 * @param string $property
	 * @param mixed $value
	 * @return void
	 */
	protected function setProperty($fieldList, $property, $value)
	{
		foreach ((array)$fieldList as $field) {
		    if (!isset($this->fieldValidator[$field])) {
		        $this->fieldValidator[$field] = [];
		    }
		    $this->fieldValidator[$field] = [ $property => $value ];
		}
	}


	/**
	 * @return RowValidator
	 */
	public static function getInstance()
	{
		return new RowValidator();
	}


	/**
	 * Return an empty array if no errors found, otherwise and array with the errors
	 *
	 * @param Row $row
	 * @return array
	 */
	public function validate(Row $row)
	{
		$errors = [];
		foreach ($this->fieldValidator as $field => $properties) {
		    $errors[] = $this->checkRequired($field, $properties, $row->get($field));
		    $errors[] = $this->checkNumber($field, $properties, $row->get($field));
		    $errors[] = $this->checkRegex($field, $properties, $row->get($field));
		    $errors[] = $this->checkCustom($field, $properties, $row->get($field));
		}
		return array_values(array_filter($errors, function($value) { return !empty($value); }));
	}


	/**
	 * Return null if the value is not empty, otherwise a string with the error message
	 *
	 * @param string $field
	 * @param array $properties
	 * @param mixed $value
	 * @return string|null
	 */
	protected function checkRequired($field, $properties, $value)
	{
		if (isset($properties[self::REQUIRED]) && $properties[self::REQUIRED] && empty($value)) {
		    return "$field is required";
		}
		return null;
	}


	/**
	 * Return null if the value is numeric, otherwise a string with the error message
	 *
	 * @param string $field
	 * @param array $properties
	 * @param mixed $value
	 * @return string|null
	 */
	protected function checkNumber($field, $properties, $value)
	{
		if (isset($properties[self::NUMBER]) && $properties[self::NUMBER] && !is_numeric($value)) {
		    return "$field needs to be a number";
		}
		return null;
	}


	/**
	 * Return null if the value matches with the regular expression, otherwise a string with the error message
	 *
	 * @param string $field
	 * @param array $properties
	 * @param mixed $value
	 * @return string|null
	 */
	protected function checkRegex($field, $properties, $value)
	{
		if (isset($properties[self::REGEX]) && !empty($properties[self::REGEX]) && !preg_match($properties[self::REGEX], $value)) {
		    return "Regex expression for $field doesn't match";
		}
		return null;
	}


	/**
	 * Return null if the closure returns null, otherwise the value returned by the Closure
	 *
	 * @param string $field
	 * @param array $properties
	 * @param mixed $value
	 * @return string|null
	 */
	protected function checkCustom($field, $properties, $value)
	{
		$result = null;
		if (isset($properties[self::CUSTOM]) && $properties[self::CUSTOM] instanceof Closure) {
		    $result =  $properties[self::CUSTOM]($value);
		}
		return empty($result) ? null : $result;
	}


	/**
	 * @param string $field
	 * @return RowValidator
	 */
	public function requiredField($field)
	{
		return $this->requiredFields([$field]);
	}


	/**
	 * @param array $fieldList
	 * @return RowValidator
	 */
	public function requiredFields($fieldList)
	{
		$this->setProperty($fieldList, self::REQUIRED, true);
		return $this;
	}


	/**
	 * @param array $fieldList
	 * @return RowValidator
	 */
	public function numericFields($fieldList)
	{
		$this->setProperty($fieldList, self::NUMBER, true);
		return $this;
	}


	/**
	 * @param array|string $field
	 * @param string $regEx
	 * @return RowValidator
	 */
	public function regexValidation($field, $regEx)
	{
		$this->setProperty($field, self::REGEX, $regEx);
		return $this;
	}


	/**
	 * @param array|string $field
	 * @param Closure $closure
	 * @return RowValidator
	 */
	public function customValidation($field, $closure)
	{
		$this->setProperty($field, self::CUSTOM, $closure);
		return $this;
	}
}
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