<?php
  
  /*
   * This file is part of the Assetic package, an OpenSky project.
   *
   * (c) 2010-2014 OpenSky Project Inc
   *
   * For the full copyright and license information, please view the LICENSE
   * file that was distributed with this source code.
   */
  
  namespace Assetic\Extension\Twig;
  
  use Assetic\Asset\AssetInterface;
  
  class AsseticNode extends \Twig_Node
  {
      /**
       * Constructor.
       *
       * Available attributes:
       *
       *  * debug:    The debug mode
       *  * combine:  Whether to combine assets
       *  * var_name: The name of the variable to expose to the body node
       *
       * @param AssetInterface      $asset      The asset
       * @param \Twig_NodeInterface $body       The body node
       * @param array               $inputs     An array of input strings
       * @param array               $filters    An array of filter strings
       * @param string              $name       The name of the asset
       * @param array               $attributes An array of attributes
       * @param integer             $lineno     The line number
       * @param string              $tag        The tag name
       */
      public function __construct(AssetInterface $asset, \Twig_NodeInterface $body, array $inputs, array $filters, $name, array $attributes = array(), $lineno = 0, $tag = null)
      {
          $nodes = array('body' => $body);
  
          $attributes = array_replace(
              array('debug' => null, 'combine' => null, 'var_name' => 'asset_url'),
              $attributes,
              array('asset' => $asset, 'inputs' => $inputs, 'filters' => $filters, 'name' => $name)
          );
  
          parent::__construct($nodes, $attributes, $lineno, $tag);
      }
  
      public function compile(\Twig_Compiler $compiler)
      {
          $compiler->addDebugInfo($this);
  
          $combine = $this->getAttribute('combine');
          $debug = $this->getAttribute('debug');
  
          if (null === $combine && null !== $debug) {
              $combine = !$debug;
          }
  
          if (null === $combine) {
              $compiler
                  ->write("if (isset(\$context['assetic']['debug']) && \$context['assetic']['debug']) {
  ")
                  ->indent()
              ;
  
              $this->compileDebug($compiler);
  
              $compiler
                  ->outdent()
                  ->write("} else {
  ")
                  ->indent()
              ;
  
              $this->compileAsset($compiler, $this->getAttribute('asset'), $this->getAttribute('name'));
  
              $compiler
                  ->outdent()
                  ->write("}
  ")
              ;
          } elseif ($combine) {
              $this->compileAsset($compiler, $this->getAttribute('asset'), $this->getAttribute('name'));
          } else {
              $this->compileDebug($compiler);
          }
  
          $compiler
              ->write('unset($context[')
              ->repr($this->getAttribute('var_name'))
              ->raw("]);
  ")
          ;
      }
  
      protected function compileDebug(\Twig_Compiler $compiler)
      {
          $i = 0;
          foreach ($this->getAttribute('asset') as $leaf) {
              $leafName = $this->getAttribute('name').'_'.$i++;
              $this->compileAsset($compiler, $leaf, $leafName);
          }
      }
  
      protected function compileAsset(\Twig_Compiler $compiler, AssetInterface $asset, $name)
      {
          if ($vars = $asset->getVars()) {
              $compiler->write("// check variable conditions
  ");
  
              foreach ($vars as $var) {
                  $compiler
                      ->write("if (!isset(\$context['assetic']['vars']['$var'])) {
  ")
                      ->indent()
                      ->write("throw new \RuntimeException(sprintf('The asset \"".$name."\" expected variable \"".$var."\" to be set, but got only these vars: %s. Did you set-up a value supplier?', isset(\$context['assetic']['vars']) && \$context['assetic']['vars'] ? implode(', ', \$context['assetic']['vars']) : '# none #'));
  ")
                      ->outdent()
                      ->write("}
  ")
                  ;
              }
  
              $compiler->raw("
  ");
          }
  
          $compiler
              ->write("// asset \"$name\"
  ")
              ->write('$context[')
              ->repr($this->getAttribute('var_name'))
              ->raw('] = ')
          ;
  
          $this->compileAssetUrl($compiler, $asset, $name);
  
          $compiler
              ->raw(";
  ")
              ->subcompile($this->getNode('body'))
          ;
      }
  
      protected function compileAssetUrl(\Twig_Compiler $compiler, AssetInterface $asset, $name)
      {
          if (!$vars = $asset->getVars()) {
              $compiler->repr($asset->getTargetPath());
  
              return;
          }
  
          $compiler
              ->raw("strtr(")
              ->string($asset->getTargetPath())
              ->raw(", array(");
          ;
  
          $first = true;
          foreach ($vars as $var) {
              if (!$first) {
                  $compiler->raw(", ");
              }
              $first = false;
  
              $compiler
                  ->string("{".$var."}")
                  ->raw(" => \$context['assetic']['vars']['$var']")
              ;
          }
  
          $compiler
              ->raw("))")
          ;
      }
  }