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<?php

    namespace CzProject\Runner;

    use CzProject\PathHelper;


    class Runner
    {
        /** @var string */
        private $directory;


        public function __construct($directory)
        {
            $this->directory = PathHelper::absolutizePath($directory);
        }


        /**
         * @param  string|string[]
         * @param  string|NULL
         * @return RunnerResult
         */
        public function run($command, $subdirectory = NULL)
        {
            $directory = $this->getDirectory($subdirectory);

            if (!is_dir($directory)) {
                throw new RunnerException("Directory '$directory' not found");
            }

            $cwd = getcwd();
            chdir($directory);

            $cmd = NULL;

            if (is_string($command)) {
                $cmd = $command;

            } else {
                $cmd = $this->processCommand((array) $command);
            }

            exec($cmd . ' 2>&1', $output, $returnCode);
            chdir($cwd);
            return new RunnerResult($cmd, $returnCode, $output);
        }


        /**
         * @param  string|NULL
         * @return string
         */
        public function getDirectory($subdirectory = NULL)
        {
            $directory = $this->directory;

            if ($subdirectory !== NULL) {
                $directory = rtrim($directory . '/' . PathHelper::absolutizePath($subdirectory, NULL), '/');
            }

            return $directory;
        }


        /**
         * @param  string
         * @return string
         */
        public function escapeArgument($argument)
        {
            return escapeshellarg($argument);
        }


        /**
         * Example: [
         *   'program',
         *   '--directory' => 'test',
         *   '--bare',
         *   'value'
         * ]
         * @param  array
         * @return string
         */
        protected function processCommand(array $args)
        {
            $cmd = array();

            $programName = $this->escapeArgument(array_shift($args));

            foreach ($args as $opt => $arg) {
                if (is_string($opt)) {
                    if ($arg !== FALSE && $arg !== NULL) {
                        $cmd[] = $opt;
                    }
                }

                if (!is_bool($arg)) {
                    $cmd[] = $this->escapeArgument($arg);
                }
            }

            return "$programName " . implode(' ', $cmd);
        }
    }