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<?php

    namespace Deliverist\Builder\Commands;

    use Deliverist\Builder\Builder;
    use Deliverist\Builder\FileSystemException;
    use Deliverist\Builder\InvalidArgumentException;
    use Deliverist\Builder\ICommand;


    class ApacheImports implements ICommand
    {
        /** @var array */
        private $toRemove;


        /**
         * @param  Builder
         * @param  string|string[]
         * @param  bool|NULL
         */
        public function run(Builder $builder, $files = NULL, $removeFiles = TRUE)
        {
            if (!isset($files)) {
                throw new InvalidArgumentException("Missing parameter 'files'.");
            }

            $this->toRemove = array();

            if (!is_array($files)) {
                $files = array($files);
            }

            foreach ($files as $file) {
                $path = $builder->getPath($file);

                if (!is_file($path)) {
                    throw new FileSystemException("File '$file' not found.");
                }

                $this->processFile($path);
            }

            if ($removeFiles) {
                foreach ($this->toRemove as $file) {
                    \Nette\Utils\FileSystem::delete($file);
                }
            }
        }


        private function processFile($path)
        {
            $content = file_get_contents($path);
            file_put_contents($path, $this->expandApacheImports($content, $path));
        }


        private function expandApacheImports($content, $path)
        {
            $dir = dirname($path);
            return preg_replace_callback('~<!--#include\s+file="(.+)"\s+-->~U', function ($m) use ($dir, $path) {
                $file = $dir . '/' . $m[1];

                if (is_file($file)) {
                    $this->toRemove[] = $file;
                    return $this->expandApacheImports(file_get_contents($file), $file);

                } else {
                    throw new FileSystemException("Required file '" . $m[1] . "' is missing.");
                }

            }, $content);
        }
    }