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<?php

    namespace CzProject\PhpCli\Parameters;

    use CzProject\PhpCli\IParameterParser;


    class DefaultParameterParser implements IParameterParser
    {
        /**
         * {@inheritDoc}
         */
        public function parse(array $raw = NULL)
        {
            $parameters = NULL;

            // parsing
            $lastName = NULL;

            if (isset($raw[1])) { // count($raw) > 1
                // remove argv[0]
                array_shift($raw);

                // parsing
                $overwrite = FALSE;

                foreach ($raw as $index => $argument) {
                    if (!is_scalar($argument) && !is_null($argument)) {
                        throw new \CzProject\PhpCli\ParameterParserException('Parameter must be scalar or NULL, ' . gettype($argument) . " given at index ($index).");
                    }

                    if ($argument === '') {
                        continue;
                    }

                    if ($argument[0] === '-') {
                        $overwrite = FALSE;
                        $name = ltrim($argument, '-');
                        $lastName = $name;

                        if ($name === '') { // --
                            $lastName = NULL;
                            continue;
                        }

                        if (strpos($name, '=')) { // --option=value
                            $parts = explode('=', $name, 2);
                            $lastName = NULL;
                            Helpers::assignParameter($parameters, $parts[0], $parts[1], FALSE);
                            continue;
                        }

                        if (!isset($parameters[$name])) {
                            Helpers::assignParameter($parameters, $name, TRUE, FALSE);
                            $overwrite = TRUE;
                        }

                    } else {
                        Helpers::assignParameter($parameters, $lastName, $argument, $overwrite);
                        $overwrite = FALSE;
                        $lastName = NULL;
                    }
                }
            }

            return $parameters;
        }
    }