<?php

namespace Artmark\Forms\Attributes;

/**
 * Description of MethodAttribute
 *
 * @author Andrey Pokidov <pokidov@e-traffic.ru>
 */
trait MethodAttribute
{
    /**
     *
     * @var string
     */
    private $method = 'POST';
    
    /**
     * HTML method attribute of the tag
     * @return string
     */
    public function method()
    {
        return $this->method;
    }
    
    /**
     * 
     * @return boolean
     */
    public function isPost()
    {
        return $this->method === 'POST';
    }
    
    /**
     * 
     * @return boolean
     */
    public function isGet()
    {
        return $this->method === 'GET';
    }
    
    /**
     * 
     * @param string $newMethod
     * @return $this
     */
    public function setMethod($newMethod)
    {
        self::checkMethod($newMethod);
        
        $this->method = self::normalizeMethod($newMethod);
        
        return $this;
    }
    
    protected function appendMethodAttribute(array & $attributes)
    {
        $attributes['method'] = $this->method;
    }
    
    public static function checkMethod($method)
    {
        if (!self::isCorrectMethod($method)) {
            throw new AttributeException('Incorrect method value: `' . strval($method) . '`');
        }
    }
    
    public static function isCorrectMethod($method)
    {
        if (!is_string($method)) {
            return false;
        }
        
        $corrected = self::normalizeMethod($method);
        
        return $corrected === 'POST' || $corrected === 'GET';
    }
    
    private static function normalizeMethod($method)
    {
        return strtoupper(trim($method));
    }
}