<?php
use Illuminate\Console\Command;
use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Input\InputOption;
use Assetic\Asset\AssetCollection;
use Assetic\Asset\FileAsset;
use Minifier\MinFilter;
class AssetsWatchCommand extends Command
{
	
	/**
	 * The console command name.
	 *
	 * @var string
	 */
	protected $name = 'assets:watch';

	/**
	 * The console command description.
	 *
	 * @var string
	 */
	protected $description = 'Watch and compile resource files.';

	/**
	 * Execute the console command.
	 *
	 * @return void
	 */
	public function fire()
	{
		$minify = $this->option('minify');
		//normally you should never target a specific environment, however it's entirely possible to access this same code branch by specifying minify on your vm or dev.
		if (App::environment() == 'production')
		{
			$minify = true;
		}
		$sections = Config::get('assets');
		$listeners = array();

		foreach ($sections as $section => $assets)
		{
			foreach ($assets as $output => $input)
			{
				if (!is_string($output))
				{
					continue;
				}

				if (!is_array($input))
				{
					$input = array($input);
				}

				foreach ($input as $file)
				{
					$listeners[public_path().'/assets/'.$file][] = function() use ($output, $input, $file, $minify)
					{
						$filters = array();
						if ($minify)
						{
							if (ends_with($output, '.js'))
							{
								$filters[] = new MinFilter('js');
							}
							if (ends_with($output, '.css'))
							{
								$filters[] = new MinFilter('css');
							}
						}

						$collection = new AssetCollection(array(), $filters);
						foreach ($input as $asset)
						{
							$collection->add(new FileAsset(public_path().'/assets/'.$asset));
						}
						$this->info('Detected change in '.$file.' compiling '.$output);
						File::put(public_path().'/assets/'.$output, $collection->dump());
						
					};
				}
			}
		}
		$watching = true;
		$stats = array();
		$listeners[app_path().'/config/asset.php'][] = function() use (&$watching)
		{
			$watching = false;
			$this->info('Detected config change, exiting');
		};
		while ($watching)
		{
			foreach ($listeners as $file => $callbacks)
			{
				if (empty($stats[$file]))
				{
					$stats[$file] = md5(file_get_contents($file));
				}
				else
				{
					$md5 = md5(file_get_contents($file));
					if ($stats[$file] !== $md5)
					{
						$stats[$file] = $md5;
						foreach ($callbacks as $callback)
						{
							$callback();
						}
					}
				}
			}
			usleep(500000);
		}
	}


	protected function getOptions()
	{
		return array(
			array('minify', 'm', InputOption::VALUE_NONE, 'Minify, defaults on in production.',	null)
		);
	}
}