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<?php

    namespace Deliverist\Builder\Commands;

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


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

            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.");
                }

                $this->compressFile($path);
            }
        }


        private function compressFile($path)
        {
            $content = file_get_contents($path);
            $output = @file_get_contents('https://closure-compiler.appspot.com/compile', FALSE, stream_context_create(array(
                'http' => array(
                    'method' => 'POST',
                    'header' => 'Content-type: application/x-www-form-urlencoded',
                    'content' => 'output_info=compiled_code&js_code=' . urlencode($content),
                )
            )));

            if (!is_string($output)) {
                $error = error_get_last();
                throw new InvalidStateException("Unable to minfy: {$error['message']}\n");
            }

            file_put_contents($path, $output);
        }
    }