<?php

namespace Assetic\Factory\Loader;

use Assetic\Factory\AssetFactory;
use Assetic\Factory\Resource\ResourceInterface;

/**
 * Loads asset formulae from PHP files.
 *
 * @author Kris Wallsmith <kris.wallsmith@gmail.com>
 */
abstract class BasePhpFormulaLoader implements FormulaLoaderInterface
{
	protected $factory;
	protected $prototypes;


	public function __construct(AssetFactory $factory)
	{
		$this->factory = $factory;
		$this->prototypes = array();

		foreach ($this->registerPrototypes() as $prototype => $options) {
		    $this->addPrototype($prototype, $options);
		}
	}


	public function addPrototype($prototype, array $options = array())
	{
		$tokens = token_get_all('<?php '.$prototype);
		array_shift($tokens);

		$this->prototypes[$prototype] = array($tokens, $options);
	}


	public function load(ResourceInterface $resource)
	{
		if (!$nbProtos = count($this->prototypes)) {
		    throw new \LogicException('There are no prototypes registered.');
		}

		$buffers = array_fill(0, $nbProtos, '');
		$bufferLevels = array_fill(0, $nbProtos, 0);
		$buffersInWildcard = array();

		$tokens = token_get_all($resource->getContent());
		$calls = array();

		while ($token = array_shift($tokens)) {
		    $current = self::tokenToString($token);
		    // loop through each prototype (by reference)
		    foreach (array_keys($this->prototypes) as $i) {
		        $prototype =& $this->prototypes[$i][0];
		        $options = $this->prototypes[$i][1];
		        $buffer =& $buffers[$i];
		        $level =& $bufferLevels[$i];

		        if (isset($buffersInWildcard[$i])) {
		            switch ($current) {
		                case '(': ++$level; break;
		                case ')': --$level; break;
		            }

		            $buffer .= $current;

		            if (!$level) {
		                $calls[] = array($buffer.';', $options);
		                $buffer = '';
		                unset($buffersInWildcard[$i]);
		            }
		        } elseif ($current == self::tokenToString(current($prototype))) {
		            $buffer .= $current;
		            if ('*' == self::tokenToString(next($prototype))) {
		                $buffersInWildcard[$i] = true;
		                ++$level;
		            }
		        } else {
		            reset($prototype);
		            unset($buffersInWildcard[$i]);
		            $buffer = '';
		        }
		    }
		}

		$formulae = array();
		foreach ($calls as $call) {
		    $formulae += call_user_func_array(array($this, 'processCall'), $call);
		}

		return $formulae;
	}


	private function processCall($call, array $protoOptions = array())
	{
		$tmp = tempnam(sys_get_temp_dir(), 'assetic');
		file_put_contents($tmp, implode("\n", array(
		    '<?php',
		    $this->registerSetupCode(),
		    $call,
		    'echo serialize($_call);',
		)));
		$args = unserialize(shell_exec('php '.escapeshellarg($tmp)));
		unlink($tmp);

		$inputs  = isset($args[0]) ? self::argumentToArray($args[0]) : array();
		$filters = isset($args[1]) ? self::argumentToArray($args[1]) : array();
		$options = isset($args[2]) ? $args[2] : array();

		if (!isset($options['debug'])) {
		    $options['debug'] = $this->factory->isDebug();
		}

		if (!is_array($options)) {
		    throw new \RuntimeException('The third argument must be omitted, null or an array.');
		}

		// apply the prototype options
		$options += $protoOptions;

		if (!isset($options['name'])) {
		    $options['name'] = $this->factory->generateAssetName($inputs, $filters, $options);
		}

		return array($options['name'] => array($inputs, $filters, $options));
	}


	/**
	 * Returns an array of prototypical calls and options.
	 *
	 * @return array Prototypes and options
	 */
	abstract protected function registerPrototypes();


	/**
	 * Returns setup code for the reflection scriptlet.
	 *
	 * @return string Some PHP setup code
	 */
	abstract protected function registerSetupCode();


	protected static function tokenToString($token)
	{
		return is_array($token) ? $token[1] : $token;
	}


	protected static function argumentToArray($argument)
	{
		return is_array($argument) ? $argument : array_filter(array_map('trim', explode(',', $argument)));
	}
}
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