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<?php

namespace Midtrans;

/**
 * Request params filters.
 *
 * It truncate fields that have length limit, remove not allowed characters from other fields
 *
 * This feature is optional, you can control it with Config::$isSanitized (default: false)
 */
class Sanitizer
{
    private $filters;

    public function __construct()
    {
        $this->filters = array();
    }

    /**
     * Validates and modify data
     * 
     * @param mixed[] $json
     */
    public static function jsonRequest(&$json)
    {
        $keys = array('item_details', 'customer_details');
        foreach ($keys as $key) {
            if (!isset($json[$key])) continue;
            $camel = static::upperCamelize($key);
            $function = "field$camel";
            static::$function($json[$key]);
        }
    }

    private static function fieldItemDetails(&$items)
    {
        foreach ($items as &$item) {
            $id = new self;
            $item['id'] = $id
                ->maxLength(50)
                ->apply($item['id']);
            $name = new self;
            $item['name'] = $name
                ->maxLength(50)
                ->apply($item['name']);
        }
    }

    private static function fieldCustomerDetails(&$field)
    {
        $first_name = new self;
        $field['first_name'] = $first_name
            ->maxLength(20)
            ->apply($field['first_name']);
        if (isset($field['last_name'])) {
            $last_name = new self;
            $field['last_name'] = $last_name
                ->maxLength(20)
                ->apply($field['last_name']);
        }
        $email = new self;
        $field['email'] = $email
            ->maxLength(45)
            ->apply($field['email']);

        static::fieldPhone($field['phone']);

        if (!empty($field['billing_address']) || !empty($field['shipping_address'])) {
            $keys = array('billing_address', 'shipping_address');
            foreach ($keys as $key) {
                if (!isset($field[$key])) continue;

                $camel = static::upperCamelize($key);
                $function = "field$camel";
                static::$function($field[$key]);
            }
        }
        
    }

    private static function fieldBillingAddress(&$field)
    {
        $fields = array(
            'first_name'   => 20,
            'last_name'    => 20,
            'address'      => 200,
            'city'         => 20,
            'country_code' => 10
        );

        foreach ($fields as $key => $value) {
            if (isset($field[$key])) {
                $self = new self;
                $field[$key] = $self
                    ->maxLength($value)
                    ->apply($field[$key]);
            }
        }

        if (isset($field['postal_code'])) {
            $postal_code = new self;
            $field['postal_code'] = $postal_code
                ->whitelist('A-Za-z0-9\\- ')
                ->maxLength(10)
                ->apply($field['postal_code']);
        }
        if (isset($field['phone'])) {
            static::fieldPhone($field['phone']);
        }
    }

    private static function fieldShippingAddress(&$field)
    {
        static::fieldBillingAddress($field);
    }

    private static function fieldPhone(&$field)
    {
        $plus = substr($field, 0, 1) === '+' ? true : false;
        $self = new self;
        $field = $self
            ->whitelist('\\d\\-\\(\\) ')
            ->maxLength(19)
            ->apply($field);

        if ($plus) $field = '+' . $field;
        $self = new self;
        $field = $self
            ->maxLength(19)
            ->apply($field);
    }

    private function maxLength($length)
    {
        $this->filters[] = function ($input) use ($length) {
            return substr($input, 0, $length);
        };
        return $this;
    }

    private function whitelist($regex)
    {
        $this->filters[] = function ($input) use ($regex) {
            return preg_replace("/[^$regex]/", '', $input);
        };
        return $this;
    }

    private function apply($input)
    {
        foreach ($this->filters as $filter) {
            $input = call_user_func($filter, $input);
        }
        return $input;
    }

    private static function upperCamelize($string)
    {
        return str_replace(' ', '', ucwords(str_replace('_', ' ', $string)));
    }
}