<?php

/*
 * This file is part of the symfony package.
 * (c) 2004-2006 Fabien Potencier <fabien.potencier@symfony-project.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

/**
 * sfViewConfigHandler allows you to configure views.
 *
 * @package    symfony
 * @subpackage config
 * @author     Fabien Potencier <fabien.potencier@symfony-project.com>
 * @version    SVN: $Id$
 */
class sfViewConfigHandler extends sfYamlConfigHandler
{
  /**
   * Executes this configuration handler.
   *
   * @param array $configFiles An array of absolute filesystem path to a configuration file
   *
   * @return string Data to be written to a cache file
   *
   * @throws <b>sfConfigurationException</b> If a requested configuration file does not exist or is not readable
   * @throws <b>sfParseException</b> If a requested configuration file is improperly formatted
   * @throws <b>sfInitializationException</b> If a view.yml key check fails
   */
  public function execute($configFiles)
  {
    // parse the yaml
    $this->yamlConfig = static::getConfiguration($configFiles);

    // init our data array
    $data = array();

    $data[] = "\$response = \$this->context->getResponse();\n\n";

    // first pass: iterate through all view names to determine the real view name
    $first = true;
    foreach ($this->yamlConfig as $viewName => $values)
    {
      if ($viewName == 'all')
      {
        continue;
      }

      $data[] = ($first ? '' : 'else ')."if (\$this->actionName.\$this->viewName == '$viewName')\n".
                "{\n";
      $data[] = $this->addTemplate($viewName);
      $data[] = "}\n";

      $first = false;
    }

    // general view configuration
    $data[] = ($first ? '' : "else\n{")."\n";
    $data[] = $this->addTemplate($viewName);
    $data[] = ($first ? '' : "}")."\n\n";

    // second pass: iterate through all real view names
    $first = true;
    foreach ($this->yamlConfig as $viewName => $values)
    {
      if ($viewName == 'all')
      {
        continue;
      }

      $data[] = ($first ? '' : 'else ')."if (\$templateName.\$this->viewName == '$viewName')\n".
                "{\n";

      $data[] = $this->addLayout($viewName);
      $data[] = $this->addComponentSlots($viewName);
      $data[] = $this->addHtmlHead($viewName);
      $data[] = $this->addEscaping($viewName);

      $data[] = $this->addHtmlAsset($viewName);

      $data[] = "}\n";

      $first = false;
    }

    // general view configuration
    $data[] = ($first ? '' : "else\n{")."\n";

    $data[] = $this->addLayout();
    $data[] = $this->addComponentSlots();
    $data[] = $this->addHtmlHead();
    $data[] = $this->addEscaping();

    $data[] = $this->addHtmlAsset();
    $data[] = ($first ? '' : "}")."\n";

    // compile data
    $retval = sprintf("<?php\n".
                      "// auto-generated by sfViewConfigHandler\n".
                      "// date: %s\n%s\n",
                      date('Y/m/d H:i:s'), implode('', $data));

    return $retval;
  }

  /**
   * Adds a component slot statement to the data.
   *
   * @param string $viewName The view name
   *
   * @return string The PHP statement
   */
  protected function addComponentSlots($viewName = '')
  {
    $data = '';

    $components = $this->mergeConfigValue('components', $viewName);
    foreach ($components as $name => $component)
    {
      if (!is_array($component) || count($component) < 1)
      {
        $component = array(null, null);
      }

      $data .= "  \$this->setComponentSlot('$name', '{$component[0]}', '{$component[1]}');\n";
      $data .= "  if (sfConfig::get('sf_logging_enabled')) \$this->context->getEventDispatcher()->notify(new sfEvent(\$this, 'application.log', array(sprintf('Set component \"%s\" (%s/%s)', '$name', '{$component[0]}', '{$component[1]}'))));\n";
    }

    return $data;
  }

  /**
   * Adds a template setting statement to the data.
   *
   * @param string $viewName The view name
   *
   * @return string The PHP statement
   */
  protected function addTemplate($viewName = '')
  {
    $data = '';

    $templateName = $this->getConfigValue('template', $viewName);
    $defaultTemplateName = $templateName ? "'$templateName'" : '$this->actionName';

    $data .= "  \$templateName = sfConfig::get('symfony.view.'.\$this->moduleName.'_'.\$this->actionName.'_template', $defaultTemplateName);\n";
    $data .= "  \$this->setTemplate(\$templateName.\$this->viewName.\$this->getExtension());\n";

    return $data;
  }

  /**
   * Adds a layout statement statement to the data.
   *
   * @param string $viewName The view name
   *
   * @return string The PHP statement
   */
  protected function addLayout($viewName = '')
  {
    // true if the user set 'has_layout' to true or set a 'layout' name for this specific action
    $hasLocalLayout = isset($this->yamlConfig[$viewName]['layout']) || (isset($this->yamlConfig[$viewName]) && array_key_exists('has_layout', $this->yamlConfig[$viewName]));

    // the layout value
    $layout = $this->getConfigValue('has_layout', $viewName) ? $this->getConfigValue('layout', $viewName) : false;

    // the user set a decorator in the action
    $data = <<<EOF
  if (null !== \$layout = sfConfig::get('symfony.view.'.\$this->moduleName.'_'.\$this->actionName.'_layout'))
  {
    \$this->setDecoratorTemplate(false === \$layout ? false : \$layout.\$this->getExtension());
  }
EOF;

    if ($hasLocalLayout)
    {
      // the user set a decorator in view.yml for this action
      $data .= <<<EOF

  else
  {
    \$this->setDecoratorTemplate('' == '$layout' ? false : '$layout'.\$this->getExtension());
  }

EOF;
    }
    else
    {
      // no specific configuration
      // set the layout to the 'all' view.yml value except if:
      //   * the decorator template has already been set by "someone" (via view.configure_format for example)
      //   * the request is an XMLHttpRequest request
      $data .= <<<EOF

  else if (null === \$this->getDecoratorTemplate() && !\$this->context->getRequest()->isXmlHttpRequest())
  {
    \$this->setDecoratorTemplate('' == '$layout' ? false : '$layout'.\$this->getExtension());
  }

EOF;
    }

    return $data;
  }

  /**
   * Adds http metas and metas statements to the data.
   *
   * @param string $viewName The view name
   *
   * @return string The PHP statement
   */
  protected function addHtmlHead($viewName = '')
  {
    $data = array();

    foreach ($this->mergeConfigValue('http_metas', $viewName) as $httpequiv => $content)
    {
      $data[] = sprintf("  \$response->addHttpMeta('%s', '%s', false);", $httpequiv, str_replace('\'', '\\\'', $content));
    }

    foreach ($this->mergeConfigValue('metas', $viewName) as $name => $content)
    {
      $data[] = sprintf("  \$response->addMeta('%s', '%s', false, false);", $name, str_replace('\'', '\\\'', preg_replace('/&amp;(?=\w+;)/', '&', htmlspecialchars($content, ENT_QUOTES, sfConfig::get('sf_charset')))));
    }

    return implode("\n", $data)."\n";
  }

  /**
   * Adds stylesheets and javascripts statements to the data.
   *
   * @param string $viewName The view name
   *
   * @return string The PHP statement
   */
  protected function addHtmlAsset($viewName = '')
  {
    // Merge the current view's stylesheets with the app's default stylesheets
    $stylesheets = $this->mergeConfigValue('stylesheets', $viewName);
    $css = $this->addAssets('Stylesheet', $stylesheets);

    // Merge the current view's javascripts with the app's default javascripts
    $javascripts = $this->mergeConfigValue('javascripts', $viewName);
    $js = $this->addAssets('Javascript', $javascripts);

    return implode("\n", array_merge($css, $js))."\n";
  }

  /**
   * Creates a list of add$Type PHP statements for the given type and config.
   *
   * @param string $type of asset. Requires an sfWebResponse->add$Type(string, string, array) method
   * @param array  $assets
   *
   * @return array ist of add$Type PHP statements
   */
  private function addAssets($type, $assets){
    $tmp = array();
    foreach ((array) $assets as $asset)
    {
      $position = '';
      if (is_array($asset))
      {
        reset($asset);
        $key = key($asset);
        $options = $asset[$key];
        if (isset($options['position']))
        {
          $position = $options['position'];
          unset($options['position']);
        }
      }
      else
      {
        $key = $asset;
        $options = array();
      }

      if ('-*' == $key)
      {
        $tmp = array();
      }
      else if ('-' == $key[0])
      {
        unset($tmp[substr($key, 1)]);
      }
      else
      {
        $tmp[$key] = sprintf("  \$response->add%s('%s', '%s', %s);", $type, $key, $position, str_replace("\n", '', var_export($options, true)));
      }
    }
    return array_values($tmp);
  }

  /**
   * Adds an escaping statement to the data.
   *
   * @param string $viewName The view name
   *
   * @return string The PHP statement
   */
  protected function addEscaping($viewName = '')
  {
    $data = array();

    $escaping = $this->getConfigValue('escaping', $viewName);

    if (isset($escaping['method']))
    {
      $data[] = sprintf("  \$this->getAttributeHolder()->setEscapingMethod(%s);", var_export($escaping['method'], true));
    }

    return implode("\n", $data)."\n";
  }

  /**
   * @see sfConfigHandler
   * @inheritdoc
   */
  static public function getConfiguration(array $configFiles)
  {
    return static::mergeConfig(static::parseYamls($configFiles));
  }

  static protected function mergeConfig($config)
  {
    // merge javascripts and stylesheets
    $config['all']['stylesheets'] = array_merge(isset($config['default']['stylesheets']) && is_array($config['default']['stylesheets']) ? $config['default']['stylesheets'] : array(), isset($config['all']['stylesheets']) && is_array($config['all']['stylesheets']) ? $config['all']['stylesheets'] : array());
    unset($config['default']['stylesheets']);

    $config['all']['javascripts'] = array_merge(isset($config['default']['javascripts']) && is_array($config['default']['javascripts']) ? $config['default']['javascripts'] : array(), isset($config['all']['javascripts']) && is_array($config['all']['javascripts']) ? $config['all']['javascripts'] : array());
    unset($config['default']['javascripts']);

    // merge default and all
    $config['all'] = sfToolkit::arrayDeepMerge(
      isset($config['default']) && is_array($config['default']) ? $config['default'] : array(),
      isset($config['all']) && is_array($config['all']) ? $config['all'] : array()
    );

    unset($config['default']);

    return static::replaceConstants($config);
  }
}
