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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;
    use Nette\Utils\FileSystem;


    class MinifyContent implements ICommand
    {
        /**
         * @param  Builder
         * @param  string|string[]
         */
        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) {
                $builder->log("Minify content of '$file'.");
                $path = $builder->getPath($file);

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

                $lines = file($path);
                $lines = array_map('trim', $lines);
                $lines = array_filter($lines, function ($line) { // remove empty lines
                    return $line !== '';
                });
                FileSystem::write($path, implode("\n", $lines) . "\n");
            }
        }
    }