<?php
/**
 * Smarty Internal Plugin Smarty Template  Base
 * This file contains the basic shared methods for template handling
 *
 * @package    Smarty
 * @subpackage Template
 * @author     Uwe Tews
 */

/**
 * Class with shared template methods
 *
 * @package      Smarty
 * @subpackage   Template
 *
 * @method Smarty_Internal_TemplateBase setAutoloadFilters(mixed $filters, string $type = null)
 * @method Smarty_Internal_TemplateBase addAutoloadFilters(mixed $filters, string $type = null)
 * @method array getAutoloadFilters(string $type = null)
 * @local_method Smarty_Internal_TemplateBase registerFilter(string $type, callback $callback, string $name = null)
 * @method Smarty_Internal_TemplateBase unregisterFilter(string $type, mixed $callback)
 * @local_method bool loadFilter(string $type, string $name)
 * @method Smarty_Internal_TemplateBase unloadFilter(string $type, string $name)
 * @method string getDebugTemplate()
 * @method Smarty_Internal_TemplateBase setDebugTemplate(string $tpl_name)
 * @method Smarty_Internal_TemplateBase setDefaultModifier(mixed $modifiers)
 * @method Smarty_Internal_TemplateBase addDefaultModifier(mixed $modifiers)
 * @method array getDefaultModifier()
 * @method Smarty_Internal_TemplateBase registerDefaultPluginHandler(callback $callback)
 * @method Smarty_Internal_TemplateBase registerResource(string $name, Smarty_Resource $resource_handler)
 * @method Smarty_Internal_TemplateBase unregisterResource(string $name)
 * @method Smarty_Internal_TemplateBase registerCacheResource(string $name, Smarty_CacheResource $resource_handler)
 * @method Smarty_Internal_TemplateBase unregisterCacheResource(string $name)
 * @local_method Smarty_Internal_TemplateBase registerPlugin(string $type, string $name, callback $callback, bool
 *               $cacheable = true, mixed $cache_attr = null)
 * @method Smarty_Internal_TemplateBase unregisterPlugin(string $type, string $name)
 * @local_method Smarty_Internal_TemplateBase registerObject(string $object_name, object $object, array
 *               $allowed_methods_properties = array(), bool $format = true, array $block_methods = array())
 * @method Smarty_Internal_TemplateBase unregisterObject(string $object_name)
 * @method object getRegisteredObject(string $object_name)
 * @method Smarty_Internal_TemplateBase registerClass(string $class_name, string $class_impl)
 * @method Smarty_Internal_TemplateBase createData(Smarty_Internal_Data $parent = null, string $name = null)
 * @method array getTags(mixed $template = null)
 */
abstract class Smarty_Internal_TemplateBase extends Smarty_Internal_Data
{
    /**
     * Set this if you want different sets of cache files for the same
     * templates.
     *
     * @var string
     */
    public $cache_id = null;

    /**
     * Set this if you want different sets of compiled files for the same
     * templates.
     *
     * @var string
     */
    public $compile_id = null;

    /**
     * caching enabled
     *
     * @var boolean
     */
    public $caching = false;

    /**
     * cache lifetime in seconds
     *
     * @var integer
     */
    public $cache_lifetime = 3600;

    /**
     * universal cache
     *
     * @var array()
     */
    public $_cache = array();

    /**
     * fetches a rendered Smarty template
     *
     * @param  string $template         the resource handle of the template file or template object
     * @param  mixed  $cache_id         cache id to be used with this template
     * @param  mixed  $compile_id       compile id to be used with this template
     * @param  object $parent           next higher level of Smarty variables
     * @param  bool   $display          not used - left for BC
     * @param  bool   $merge_tpl_vars   not used - left for BC
     * @param  bool   $no_output_filter not used - left for BC
     *
     * @throws Exception
     * @throws SmartyException
     * @return string rendered template output
     */
    public function fetch($template = null, $cache_id = null, $compile_id = null, $parent = null, $display = false,
                          $merge_tpl_vars = true, $no_output_filter = false)
    {
        $result = $this->_execute($template, $cache_id, $compile_id, $parent, 'fetch');
        return $result === null ? ob_get_clean() : $result;
    }

    /**
     * displays a Smarty template
     *
     * @param string $template   the resource handle of the template file or template object
     * @param mixed  $cache_id   cache id to be used with this template
     * @param mixed  $compile_id compile id to be used with this template
     * @param object $parent     next higher level of Smarty variables
     */
    public function display($template = null, $cache_id = null, $compile_id = null, $parent = null)
    {
        // display template
        $this->_execute($template, $cache_id, $compile_id, $parent, 'display');
    }

    /**
     * test if cache is valid
     *
     * @api  Smarty::isCached()
     * @link http://www.smarty.net/docs/en/api.is.cached.tpl
     *
     * @param  null|string|\Smarty_Internal_Template $template   the resource handle of the template file or template object
     * @param  mixed                                 $cache_id   cache id to be used with this template
     * @param  mixed                                 $compile_id compile id to be used with this template
     * @param  object                                $parent     next higher level of Smarty variables
     *
     * @return boolean       cache status
     */
    public function isCached($template = null, $cache_id = null, $compile_id = null, $parent = null)
    {
        return $this->_execute($template, $cache_id, $compile_id, $parent, 'isCached');
    }

    /**
     * fetches a rendered Smarty template
     *
     * @param  string $template   the resource handle of the template file or template object
     * @param  mixed  $cache_id   cache id to be used with this template
     * @param  mixed  $compile_id compile id to be used with this template
     * @param  object $parent     next higher level of Smarty variables
     * @param  string $function   function name
     *
     * @return mixed
     * @throws \Exception
     * @throws \SmartyException
     */
    private function _execute($template, $cache_id, $compile_id, $parent, $function)
    {
        /* @var Smarty $smarty */
        $smarty = $this->_objType == 1 ? $this : $this->smarty;
        if ($template === null) {
            if ($this->_objType != 2) {
                throw new SmartyException($function . '():Missing \'$template\' parameter');
            } else {
                $template = $this;
            }
        } elseif (is_object($template)) {
            if (!isset($template->_objType) || $template->_objType != 2) {
                throw new SmartyException($function . '():Template object expected');
            }
        } else {
            // get template object
            /* @var Smarty_Internal_Template $template */
            $template = $smarty->createTemplate($template, $cache_id, $compile_id, $parent, false);
            if ($this->_objType == 1) {
                // set caching in template object
                $template->caching = $this->caching;
            }
        }
        // fetch template content
        $level = ob_get_level();
        try {
            $_smarty_old_error_level =
                ($this->_objType == 1 && isset($smarty->error_reporting)) ? error_reporting($smarty->error_reporting) :
                    null;
            if ($function == 'isCached') {
                if ($template->caching) {
                    // return cache status of template
                    if (!isset($template->cached)) {
                        $template->loadCached();
                    }
                    $result = $template->cached->isCached($template);
                    $template->smarty->_cache['isCached'][$template->_getTemplateId()] = $template;
                } else {
                    return false;
                }
            } else {
                ob_start();
                $result = $template->render(true, false, $function == 'display');
            }
            if (isset($_smarty_old_error_level)) {
                error_reporting($_smarty_old_error_level);
            }
            return $result;
        }
        catch (Exception $e) {
            while (ob_get_level() > $level) {
                ob_end_clean();
            }
            throw $e;
        }
    }

    /**
     * Registers plugin to be used in templates
     * NOTE: this method can be safely removed for dynamic loading
     *
     * @api  Smarty::registerPlugin()
     * @link http://www.smarty.net/docs/en/api.register.plugin.tpl
     *
     * @param  string   $type       plugin type
     * @param  string   $name       name of template tag
     * @param  callback $callback   PHP callback to register
     * @param  bool     $cacheable  if true (default) this function is cache able
     * @param  mixed    $cache_attr caching attributes if any
     *
     * @return \Smarty|\Smarty_Internal_Template
     * @throws SmartyException              when the plugin tag is invalid
     */
    public function registerPlugin($type, $name, $callback, $cacheable = true, $cache_attr = null)
    {
        /* @var Smarty $smarty */
        $smarty = isset($this->smarty) ? $this->smarty : $this;
        if (isset($smarty->registered_plugins[$type][$name])) {
            throw new SmartyException("Plugin tag \"{$name}\" already registered");
        } elseif (!is_callable($callback)) {
            throw new SmartyException("Plugin \"{$name}\" not callable");
        } else {
            $smarty->registered_plugins[$type][$name] = array($callback, (bool) $cacheable, (array) $cache_attr);
        }
        return $this;
    }

    /**
     * load a filter of specified type and name
     * NOTE: this method can be safely removed for dynamic loading
     *
     * @api  Smarty::loadFilter()
     * @link http://www.smarty.net/docs/en/api.load.filter.tpl
     *
     * @param  string $type filter type
     * @param  string $name filter name
     *
     * @return bool
     * @throws SmartyException if filter could not be loaded
     */
    public function loadFilter($type, $name)
    {
        /* @var Smarty $smarty */
        $smarty = isset($this->smarty) ? $this->smarty : $this;
        if (!in_array($type, array('pre', 'post', 'output', 'variable'))) {
            throw new SmartyException("Illegal filter type \"{$type}\"");
        }
        $_plugin = "smarty_{$type}filter_{$name}";
        $_filter_name = $_plugin;
        if (is_callable($_plugin)) {
            $smarty->registered_filters[$type][$_filter_name] = $_plugin;
            return true;
        }
        if ($smarty->loadPlugin($_plugin)) {
            if (class_exists($_plugin, false)) {
                $_plugin = array($_plugin, 'execute');
            }
            if (is_callable($_plugin)) {
                $smarty->registered_filters[$type][$_filter_name] = $_plugin;
                return true;
            }
        }
        throw new SmartyException("{$type}filter \"{$name}\" not found or callable");
    }

    /**
     * Registers a filter function
     * NOTE: this method can be safely removed for dynamic loading
     *
     * @api  Smarty::registerFilter()
     * @link http://www.smarty.net/docs/en/api.register.filter.tpl
     *
     * @param  string      $type filter type
     * @param  callback    $callback
     * @param  string|null $name optional filter name
     *
     * @return \Smarty|\Smarty_Internal_Template
     * @throws \SmartyException
     */
    public function registerFilter($type, $callback, $name = null)
    {
        /* @var Smarty $smarty */
        $smarty = isset($this->smarty) ? $this->smarty : $this;
        if (!in_array($type, array('pre', 'post', 'output', 'variable'))) {
            throw new SmartyException("Illegal filter type \"{$type}\"");
        }
        $name = isset($name) ? $name : $this->_getFilterName($callback);
        if (!is_callable($callback)) {
            throw new SmartyException("{$type}filter \"{$name}\" not callable");
        }
        $smarty->registered_filters[$type][$name] = $callback;
        return $this;
    }

    /**
     * Return internal filter name
     *
     * @param  callback $function_name
     *
     * @return string   internal filter name
     */
    public function _getFilterName($function_name)
    {
        if (is_array($function_name)) {
            $_class_name = (is_object($function_name[0]) ? get_class($function_name[0]) : $function_name[0]);

            return $_class_name . '_' . $function_name[1];
        } elseif (is_string($function_name)) {
            return $function_name;
        } else {
            return 'closure';
        }
    }

    /**
     * Registers object to be used in templates
     * NOTE: this method can be safely removed for dynamic loading
     *
     * @api  Smarty::registerObject()
     * @link http://www.smarty.net/docs/en/api.register.object.tpl
     *
     * @param  string $object_name
     * @param  object $object                     the referenced PHP object to register
     * @param  array  $allowed_methods_properties list of allowed methods (empty = all)
     * @param  bool   $format                     smarty argument format, else traditional
     * @param  array  $block_methods              list of block-methods
     *
     * @return \Smarty|\Smarty_Internal_Template
     * @throws \SmartyException
     */
    public function registerObject($object_name, $object, $allowed_methods_properties = array(), $format = true,
                                   $block_methods = array())
    {
        /* @var Smarty $smarty */
        $smarty = isset($this->smarty) ? $this->smarty : $this;
        // test if allowed methods callable
        if (!empty($allowed_methods_properties)) {
            foreach ((array) $allowed_methods_properties as $method) {
                if (!is_callable(array($object, $method)) && !property_exists($object, $method)) {
                    throw new SmartyException("Undefined method or property '$method' in registered object");
                }
            }
        }
        // test if block methods callable
        if (!empty($block_methods)) {
            foreach ((array) $block_methods as $method) {
                if (!is_callable(array($object, $method))) {
                    throw new SmartyException("Undefined method '$method' in registered object");
                }
            }
        }
        // register the object
        $smarty->registered_objects[$object_name] =
            array($object, (array) $allowed_methods_properties, (boolean) $format, (array) $block_methods);
        return $this;
    }

    /**
     * @param boolean $caching
     */
    public function setCaching($caching)
    {
        $this->caching = $caching;
    }

    /**
     * @param int $cache_lifetime
     */
    public function setCacheLifetime($cache_lifetime)
    {
        $this->cache_lifetime = $cache_lifetime;
    }

    /**
     * @param string $compile_id
     */
    public function setCompileId($compile_id)
    {
        $this->compile_id = $compile_id;
    }

    /**
     * @param string $cache_id
     */
    public function setCacheId($cache_id)
    {
        $this->cache_id = $cache_id;
    }

}