<?php

/**
 * @package KantPHP
 * @author  Zhenqiang Zhang <zhenqiang.zhang@hotmail.com>
 * @copyright (c) KantPHP Studio, All rights reserved.
 * @license http://www.opensource.org/licenses/BSD-3-Clause  The BSD 3-Clause License
 */
namespace Kant\Validators;

use Kant\Kant;
use Kant\Exception\InvalidConfigException;
use Kant\Helper\ArrayHelper;

/**
 * RangeValidator validates that the attribute value is among a list of values.
 *
 * The range can be specified via the [[range]] property.
 * If the [[not]] property is set true, the validator will ensure the attribute value
 * is NOT among the specified range.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @since 2.0
 */
class RangeValidator extends Validator
{

    /**
     *
     * @var array|\Traversable|\Closure a list of valid values that the attribute value should be among or an anonymous function that returns
     *      such a list. The signature of the anonymous function should be as follows,
     *     
     *      ```php
     *      function($model, $attribute) {
     *      // compute range
     *      return $range;
     *      }
     *      ```
     */
    public $range;

    /**
     *
     * @var boolean whether the comparison is strict (both type and value must be the same)
     */
    public $strict = false;

    /**
     *
     * @var boolean whether to invert the validation logic. Defaults to false. If set to true,
     *      the attribute value should NOT be among the list of values defined via [[range]].
     */
    public $not = false;

    /**
     *
     * @var boolean whether to allow array type attribute.
     */
    public $allowArray = false;

    /**
     * @inheritdoc
     */
    public function init()
    {
        parent::init();
        if (!is_array($this->range) && ! ($this->range instanceof \Closure) && ! ($this->range instanceof \Traversable)) {
            throw new InvalidConfigException('The "range" property must be set.');
        }
        if ($this->message === null) {
            $this->message = Kant::t('kant', '{attribute} is invalid.');
        }
    }

    /**
     * @inheritdoc
     */
    protected function validateValue($value)
    {
        $in = false;
        
        if ($this->allowArray && ($value instanceof \Traversable || is_array($value)) && ArrayHelper::isSubset($value, $this->range, $this->strict)) {
            $in = true;
        }
        
        if (!$in && ArrayHelper::isIn($value, $this->range, $this->strict)) {
            $in = true;
        }
        
        return $this->not !== $in ? null : [
            $this->message,
            []
        ];
    }

    /**
     * @inheritdoc
     */
    public function validateAttribute($model, $attribute)
    {
        if ($this->range instanceof \Closure) {
            $this->range = call_user_func($this->range, $model, $attribute);
        }
        parent::validateAttribute($model, $attribute);
    }

    /**
     * @inheritdoc
     */
    public function clientValidateAttribute($model, $attribute, $view)
    {
        if ($this->range instanceof \Closure) {
            $this->range = call_user_func($this->range, $model, $attribute);
        }
        
        $range = [];
        foreach ($this->range as $value) {
            $range[] = (string) $value;
        }
        $options = [
            'range' => $range,
            'not' => $this->not,
            'message' => Kant::$app->getI18n()->format($this->message, [
                'attribute' => $model->getAttributeLabel($attribute)
            ], Kant::$app->language)
        ];
        if ($this->skipOnEmpty) {
            $options['skipOnEmpty'] = 1;
        }
        if ($this->allowArray) {
            $options['allowArray'] = 1;
        }
        
        ValidationAsset::register($view);
        
        return 'kant.validation.range(value, messages, ' . json_encode($options, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE) . ');';
    }
}
