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<?php
    /**
     * Cz CLI Console
     * @author Jan Pecha, <janpecha@email.cz>
     */

    namespace Cz\Cli\Parameters;
    use Cz\Cli\IParametersParser,
        Cz\Cli\ParametersException;

    abstract class BaseParser implements IParametersParser
    {
        /** @var  array|NULL */
        protected $defaultParameters;

        /** @var  array|NULL */
        protected $parameters;

        /** @var  bool */
        protected $parsed = FALSE;

        /** @var  array|NULL */
        protected $rawParameters;



        public function setRawParameters(array $parameters = NULL)
        {
            $this->rawParameters = $parameters;
            $this->parsed = FALSE;
            return $this;
        }



        public function setDefaultParameters(array $defaultParameters = NULL)
        {
            $this->defaultParameters = $defaultParameters;
            $this->parsed = FALSE;
            return $this;
        }



        public function getParameters()
        {
            if(!$this->parsed)
            {
                $this->parse($this->rawParameters);
                $this->parsed = TRUE;
            }

            return $this->parameters;
        }



        public function getParameter($name, $defaultValue = NULL, $required = FALSE)
        {
            if(!$this->parsed)
            {
                $this->parse($this->rawParameters);
                $this->parsed = TRUE;
            }

            if(!isset($this->parameters[$name]))
            {
                if($required)
                {
                    throw new ParametersException("Required parameter '$name' not found.");
                }

                return $defaultValue;
            }

            return $this->parameters[$name];
        }



        /**
         * @param   array|NULL
         * @return  self
         */
        protected function setParameters(array $parameters = NULL)
        {
            $this->parameters = self::merge($parameters, $this->defaultParameters);
            return $this;
        }



        protected abstract function parse(array $rawParameters = NULL);



        /**
         * Left side has pririoty. Helper method.
         * @param   array
         * @param   array
         * @return  array|NULL
         */
        protected static function merge($left, $right)
        {
            if(is_array($left) && is_array($right))
            {
                foreach($left as $key => $val)
                {
                    if(is_int($key))
                    {
                        $right[] = $val;
                    }
                    else
                    {
                        if(isset($right[$key]))
                        {
                            $val = self::merge($val, $right[$key]);
                        }

                        $right[$key] = $val;
                    }
                }

                return $right;
            }
            elseif($left === NULL && is_array($right))
            {
                return $right;
            }

            return $left;
        }
    }