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<?php

namespace Core\Helpers;

/**
 * Hooks is a class that manages all the hooks set throughout the framework.<br/>
 * Hooks are useful to attach actions to other actions, or to alter the execution thread without
 * changing the code.<br/>
 *
 * Hooks is based on the Wordpress <em>hooks</em> system, to allow for plugin flexibility<br/>
 *
 * @defaults
 * The hooks included by default in the framework are:<br/>
 * <br/>
 * {@see \Kernel\AppKernel}:
 * <code>
 * ('After_Hooks_Setup', $hooks) // called right after the constructor
 * ('exec_beforestart', ['controller' => $controllerName, 'action' => $action]) // just after {@see \Kernel\Router::matchRoute}
 * ('permission_unallowed', [
 *     'permission' => $permission,
 *     'controller' => $controllerName,
 *     'action' => $action]) // when it's an unauthorized request
 * ('general_exception', ['e' => $e]) // when an Exception is thrown
 * ('exec_afterend', ['controller' => $controllerName, 'action' => $action]) // When execution has finished
 * </code>
 * <br/>
 * {@see \Core\ParentController}:
 * <code>
 * ('include_show_view', ['vars' => $this->vars]) // Called just before including the view file {@see \Core\ParentController::show}
 * ('include_get_view', ['vars' => $_vars]) // Called just before including a view file  {@see \Core\ParentController::get}
 * ('extra_params_path', ['route' => $route]) // If extra parameters are required when creating a url {@see \Core\ParentController::path}
 * </code>
 * <br/>
 * {@see \Core\LoginController}:
 * <code>
 * ('on_userauth', ['user' => $user]) // Called just after the login session has been created {@see \Core\LoginController::login}
 * ('on_userdeauth', ['user' => Session::getUser()]) // Called just before destroying the login session. {@see \Core\LoginController::deauthenticateUser}
 * </code>
 * <br/>
 * {@see \Core\ExceptionController}:
 * <code>
 * ('show_prod_exception', ['e' => $e]) // Called when an exception is thrown on the PROD environment {@see \Core\ExceptionController::showException}
 * ('show_dev_exception', ['e' => $e]) // Called when an exception is thrown on the DEV environment {@see \Core\ExceptionController::showException}
 * </code>
 * {@see \Kernel\Logger}:
 * <code>
 * ('logger_post', $postArray) // Called before posting an error log {@see \Kernel\Logger::sendLog}
 * </code>
 *
 * See {@see \Core\Hooks::do_action} and {@see \Core\Hooks::add_action} functions to learn how to use them
 */
class Hooks
{
    protected static $hooks = null;

    /**
     * $filters holds list of hooks
     * @access public
     * @since 0.1
     * @var array
     */
    var $filters = array();
    /**
     * $merged_filters
     * @var array
     */
    var $merged_filters = array();
    /**
     * $actions
     * @var array
     */
    var $actions = array();
    /**
     * $current_filter  holds the name of the current filter
     * @access public
     * @since 0.1
     * @var array
     */
    var $current_filter = array();

    /**
     * __construct class constructor
     * @access public
     * @since 0.1
     */
    public function __construct($args = null)
    {
        $this->filters = array();
        $this->merged_filters = array();
        $this->actions = array();
        $this->current_filter = array();

        static::$hooks = $this;
    }

    /**
     * Singleton initializer
     * @return Hooks
     */
    public static function init($args = null)
    {
        return static::$hooks ?: new self($args);
    }

    /**
     * FILTERS
     */

    /**
     * add_filter Hooks a function or method to a specific filter action.
     * @access public
     * @since 0.1
     *
     * @param string $tag The name of the filter to hook the $function_to_add to.
     * @param callback $function_to_add The name of the function to be called when the filter is applied.
     * @param int $priority optional. Used to specify the order in which the functions associated with a particular
     *     action are executed (default: 10). Lower numbers correspond with earlier execution, and functions with
     *     the same priority are executed in the order in which they were added to the action.
     * @param int $accepted_args optional. The number of arguments the function accept (default 1).
     *
     * @return boolean true
     */
    public function add_filter($tag, $function_to_add, $priority = 10, $accepted_args = 1)
    {
        $idx = $this->_filter_build_unique_id($tag, $function_to_add, $priority);
        $this->filters[$tag][$priority][$idx] = array('function' => $function_to_add, 'accepted_args' => $accepted_args);
        unset($this->merged_filters[$tag]);
        return true;
    }

    /**
     * remove_filter Removes a function from a specified filter hook.
     * @access public
     * @since 0.1
     *
     * @param string $tag The filter hook to which the function to be removed is hooked.
     * @param callback $function_to_remove The name of the function which should be removed.
     * @param int $priority optional. The priority of the function (default: 10).
     * @param int $accepted_args optional. The number of arguments the function accepts (default: 1).
     *
     * @return boolean Whether the function existed before it was removed.
     */
    public function remove_filter($tag, $function_to_remove, $priority = 10)
    {
        $function_to_remove = $this->_filter_build_unique_id($tag, $function_to_remove, $priority);

        $r = isset($this->filters[$tag][$priority][$function_to_remove]);

        if (true === $r) {
            unset($this->filters[$tag][$priority][$function_to_remove]);
            if (empty($this->filters[$tag][$priority])) {
                unset($this->filters[$tag][$priority]);
            }
            unset($this->merged_filters[$tag]);
        }
        return $r;
    }

    /**
     * remove_all_filters Remove all of the hooks from a filter.
     * @access public
     * @since 0.1
     *
     * @param string $tag The filter to remove hooks from.
     * @param int $priority The priority number to remove.
     *
     * @return bool True when finished.
     */
    public function remove_all_filters($tag, $priority = false)
    {
        if (isset($this->filters[$tag])) {
            if (false !== $priority && isset($this->filters[$tag][$priority])) {
                unset($this->filters[$tag][$priority]);
            } else {
                unset($this->filters[$tag]);
            }
        }

        if (isset($this->merged_filters[$tag])) {
            unset($this->merged_filters[$tag]);
        }

        return true;
    }

    /**
     * has_filter  Check if any filter has been registered for a hook.
     * @access public
     * @since 0.1
     *
     * @param string $tag The name of the filter hook.
     * @param callback $function_to_check optional.
     *
     * @return mixed If $function_to_check is omitted, returns boolean for whether the hook has anything
     *     registered.
     *   When checking a specific function, the priority of that hook is returned, or false if the function is not
     *     attached. When using the $function_to_check argument, this function may return a non-boolean value that
     *     evaluates to false
     *   (e.g.) 0, so use the === operator for testing the return value.
     */
    public function has_filter($tag, $function_to_check = false)
    {
        $has = !empty($this->filters[$tag]);
        if (false === $function_to_check || false == $has) {
            return $has;
        }

        if (!$idx = $this->_filter_build_unique_id($tag, $function_to_check, false)) {
            return false;
        }

        foreach ((array)array_keys($this->filters[$tag]) as $priority) {
            if (isset($this->filters[$tag][$priority][$idx])) {
                return $priority;
            }
        }
        return false;
    }

    /**
     * apply_filters Call the functions added to a filter hook.
     * @access public
     * @since 0.1
     *
     * @param string $tag The name of the filter hook.
     * @param mixed $value The value on which the filters hooked to <tt>$tag</tt> are applied on.
     * @param mixed $var,... Additional variables passed to the functions hooked to <tt>$tag</tt>.
     *
     * @return mixed The filtered value after all hooked functions are applied to it.
     */
    public function apply_filters($tag, $value)
    {
        $args = array();
        // Do 'all' actions first
        if (isset($this->filters['all'])) {
            $this->current_filter[] = $tag;
            $args = func_get_args();
            $this->_call_all_hook($args);
        }

        if (!isset($this->filters[$tag])) {
            if (isset($this->filters['all'])) {
                array_pop($this->current_filter);
            }
            return $value;
        }

        if (!isset($this->filters['all'])) {
            $this->current_filter[] = $tag;
        }

        // Sort
        if (!isset($this->merged_filters[$tag])) {
            ksort($this->filters[$tag]);
            $this->merged_filters[$tag] = true;
        }

        reset($this->filters[$tag]);

        if (empty($args)) {
            $args = func_get_args();
        }

        do {
            foreach ((array)current($this->filters[$tag]) as $the_)
                if (!is_null($the_['function'])) {
                    $args[1] = $value;
                    $value = call_user_func_array($the_['function'], array_slice($args, 1, (int)$the_['accepted_args']));
                }

        } while (next($this->filters[$tag]) !== false);

        array_pop($this->current_filter);

        return $value;
    }

    /**
     * apply_filters_ref_array Execute functions hooked on a specific filter hook, specifying arguments in an array.
     * @access public
     * @since 0.1
     *
     * @param string $tag The name of the filter hook.
     * @param array $args The arguments supplied to the functions hooked to <tt>$tag</tt>
     *
     * @return mixed The filtered value after all hooked functions are applied to it.
     */
    public function apply_filters_ref_array($tag, $args)
    {
        // Do 'all' actions first
        if (isset($this->filters['all'])) {
            $this->current_filter[] = $tag;
            $all_args = func_get_args();
            $this->_call_all_hook($all_args);
        }

        if (!isset($this->filters[$tag])) {
            if (isset($this->filters['all'])) {
                array_pop($this->current_filter);
            }
            return $args[0];
        }

        if (!isset($this->filters['all'])) {
            $this->current_filter[] = $tag;
        }

        // Sort
        if (!isset($this->merged_filters[$tag])) {
            ksort($this->filters[$tag]);
            $this->merged_filters[$tag] = true;
        }

        reset($this->filters[$tag]);

        do {
            foreach ((array)current($this->filters[$tag]) as $the_)
                if (!is_null($the_['function'])) {
                    $args[0] = call_user_func_array($the_['function'], array_slice($args, 0, (int)$the_['accepted_args']));
                }

        } while (next($this->filters[$tag]) !== false);

        array_pop($this->current_filter);

        return $args[0];
    }

    /**
     * ACTIONS
     */

    /**
     * add_action Hooks a function on to a specific action.
     * @access public
     * @since 0.1
     *
     * @param string $tag The name of the action to which the $function_to_add is hooked.
     * @param callback $function_to_add The name of the function you wish to be called.
     * @param int $priority optional. Used to specify the order in which the functions associated with a particular
     *     action are executed (default: 10). Lower numbers correspond with earlier execution, and functions with
     *     the same priority are executed in the order in which they were added to the action.
     * @param int $accepted_args optional. The number of arguments the function accept (default 1).
     *
     * @return bool|true The result of the add_filter
     */
    public function add_action($tag, $function_to_add, $priority = 10, $accepted_args = 1)
    {
        return $this->add_filter($tag, $function_to_add, $priority, $accepted_args);
    }

    /**
     * has_action Check if any action has been registered for a hook.
     * @access public
     * @since 0.1
     *
     * @param string $tag The name of the action hook.
     * @param callback $function_to_check optional.
     *
     * @return mixed If $function_to_check is omitted, returns boolean for whether the hook has anything
     *     registered.
     *   When checking a specific function, the priority of that hook is returned, or false if the function is not
     *     attached. When using the $function_to_check argument, this function may return a non-boolean value that
     *     evaluates to false
     *   (e.g.) 0, so use the === operator for testing the return value.
     */
    public function has_action($tag, $function_to_check = false)
    {
        return $this->has_filter($tag, $function_to_check);
    }

    /**
     * remove_action Removes a function from a specified action hook.
     * @access public
     * @since 0.1
     *
     * @param string $tag The action hook to which the function to be removed is hooked.
     * @param callback $function_to_remove The name of the function which should be removed.
     * @param int $priority optional The priority of the function (default: 10).
     *
     * @return boolean Whether the function is removed.
     */
    public function remove_action($tag, $function_to_remove, $priority = 10)
    {
        return $this->remove_filter($tag, $function_to_remove, $priority);
    }

    /**
     * remove_all_actions Remove all of the hooks from an action.
     * @access public
     * @since 0.1
     *
     * @param string $tag The action to remove hooks from.
     * @param int $priority The priority number to remove them from.
     *
     * @return bool True when finished.
     */
    public function remove_all_actions($tag, $priority = false)
    {
        return $this->remove_all_filters($tag, $priority);
    }

    /**
     * do_action Execute functions hooked on a specific action hook.
     * @access public
     * @since 0.1
     *
     * @param string $tag The name of the action to be executed.
     * @param mixed $arg,... Optional additional arguments which are passed on to the functions hooked to the
     *     action.
     *
     * @return mixed The response of the last called action
     */
    public function do_action($tag, $arg = '')
    {

        if (!isset($this->actions)) {
            $this->actions = array();
        }

        if (!isset($this->actions[$tag])) {
            $this->actions[$tag] = 1;
        } else {
            ++$this->actions[$tag];
        }

        // Do 'all' actions first
        if (isset($this->filters['all'])) {
            $this->current_filter[] = $tag;
            $all_args = func_get_args();
            $this->_call_all_hook($all_args);
        }

        if (!isset($this->filters[$tag])) {
            if (isset($this->filters['all'])) {
                array_pop($this->current_filter);
            }
            return;
        }

        if (!isset($this->filters['all'])) {
            $this->current_filter[] = $tag;
        }

        $args = array();
        if (is_array($arg) && 1 == count($arg) && isset($arg[0]) && is_object($arg[0])) // array(&$this)
        {
            $args[] =& $arg[0];
        } else {
            $args[] = $arg;
        }
        for ($a = 2; $a < func_num_args(); $a++)
            $args[] = func_get_arg($a);

        // Sort
        if (!isset($this->merged_filters[$tag])) {
            ksort($this->filters[$tag]);
            $this->merged_filters[$tag] = true;
        }

        reset($this->filters[$tag]);

        do {
            foreach ((array)current($this->filters[$tag]) as $the_)
                if (!is_null($the_['function'])) {
                    $result = call_user_func_array($the_['function'], array_slice($args, 0, (int)$the_['accepted_args']));
                }

        } while (next($this->filters[$tag]) !== false);

        array_pop($this->current_filter);

        return $result;
    }

    /**
     * do_action_ref_array Execute functions hooked on a specific action hook, specifying arguments in an array.
     * @access public
     * @since 0.1
     *
     * @param string $tag The name of the action to be executed.
     * @param array $args The arguments supplied to the functions hooked to <tt>$tag</tt>
     *
     * @return null Will return null if $tag does not exist in $filter array
     */
    public function do_action_ref_array($tag, $args)
    {

        if (!isset($this->actions)) {
            $this->actions = array();
        }

        if (!isset($this->actions[$tag])) {
            $this->actions[$tag] = 1;
        } else {
            ++$this->actions[$tag];
        }

        // Do 'all' actions first
        if (isset($this->filters['all'])) {
            $this->current_filter[] = $tag;
            $all_args = func_get_args();
            $this->_call_all_hook($all_args);
        }

        if (!isset($this->filters[$tag])) {
            if (isset($this->filters['all'])) {
                array_pop($this->current_filter);
            }
            return;
        }

        if (!isset($this->filters['all'])) {
            $this->current_filter[] = $tag;
        }

        // Sort
        if (!isset($merged_filters[$tag])) {
            ksort($this->filters[$tag]);
            $merged_filters[$tag] = true;
        }

        reset($this->filters[$tag]);

        do {
            foreach ((array)current($this->filters[$tag]) as $the_)
                if (!is_null($the_['function'])) {
                    call_user_func_array($the_['function'], array_slice($args, 0, (int)$the_['accepted_args']));
                }

        } while (next($this->filters[$tag]) !== false);

        array_pop($this->current_filter);
    }

    /**
     * did_action Retrieve the number of times an action is fired.
     * @access public
     * @since 0.1
     *
     * @param string $tag The name of the action hook.
     *
     * @return int The number of times action hook <tt>$tag</tt> is fired
     */
    public function did_action($tag)
    {

        if (!isset($this->actions) || !isset($this->actions[$tag])) {
            return 0;
        }

        return $this->actions[$tag];
    }

    /**
     * HELPERS
     */

    /**
     * current_filter Retrieve the name of the current filter or action.
     * @access public
     * @since 0.1
     * @return string Hook name of the current filter or action.
     */
    public function current_filter()
    {
        return end($this->current_filter);
    }

    /**
     * Retrieve the name of the current action.
     *
     * @since 0.1.2
     *
     * @uses current_filter()
     *
     * @return string Hook name of the current action.
     */
    function current_action()
    {
        return $this->current_filter();
    }

    /**
     * Retrieve the name of a filter currently being processed.
     *
     * The function current_filter() only returns the most recent filter or action
     * being executed. did_action() returns true once the action is initially
     * processed. This function allows detection for any filter currently being
     * executed (despite not being the most recent filter to fire, in the case of
     * hooks called from hook callbacks) to be verified.
     *
     * @since 0.1.2
     *
     * @see current_filter()
     * @see did_action()
     * @global array $wp_current_filter Current filter.
     *
     * @param null|string $filter Optional. Filter to check. Defaults to null, which
     *                            checks if any filter is currently being run.
     *
     * @return bool Whether the filter is currently in the stack
     */
    function doing_filter($filter = null)
    {
        if (null === $filter) {
            return !empty($this->current_filter);
        }
        return in_array($filter, $this->current_filter);
    }

    /**
     * Retrieve the name of an action currently being processed.
     *
     * @since 0.1.2
     *
     * @uses doing_filter()
     *
     * @param string|null $action Optional. Action to check. Defaults to null, which checks
     *                            if any action is currently being run.
     *
     * @return bool Whether the action is currently in the stack.
     */
    function doing_action($action = null)
    {
        return $this->doing_filter($action);
    }

    /**
     * _filter_build_unique_id Build Unique ID for storage and retrieval.
     *
     * @param string $tag Used in counting how many hooks were applied
     * @param callback $function Used for creating unique id
     * @param int|bool $priority Used in counting how many hooks were applied. If === false and $function is an
     *     object reference, we return the unique id only if it already has one, false otherwise.
     *
     * @return string|bool Unique ID for usage as array key or false if $priority === false and $function is an
     *     object reference, and it does not already have a unique id.
     */
    private function _filter_build_unique_id($tag, $function, $priority)
    {
        static $filter_id_count = 0;

        if (is_string($function)) {
            return $function;
        }

        if (is_object($function)) {
            // Closures are currently implemented as objects
            $function = array($function, '');
        } else {
            $function = (array)$function;
        }

        if (is_object($function[0])) {
            // Object Class Calling
            if (function_exists('spl_object_hash')) {
                return spl_object_hash($function[0]) . $function[1];
            } else {
                $obj_idx = get_class($function[0]) . $function[1];
                if (!isset($function[0]->filter_id)) {
                    if (false === $priority) {
                        return false;
                    }
                    $obj_idx .= isset($this->filters[$tag][$priority]) ? count((array)$this->filters[$tag][$priority]) : $filter_id_count;
                    $function[0]->filter_id = $filter_id_count;
                    ++$filter_id_count;
                } else {
                    $obj_idx .= $function[0]->filter_id;
                }

                return $obj_idx;
            }
        } else {
            if (is_string($function[0])) {
                // Static Calling
                return $function[0] . $function[1];
            }
        }
    }

    /**
     * __call_all_hook
     * @access public
     * @since 0.1
     *
     * @param  (array) $args [description]
     */
    public function __call_all_hook($args)
    {
        reset($this->filters['all']);
        do {
            foreach ((array)current($this->filters['all']) as $the_)
                if (!is_null($the_['function'])) {
                    call_user_func_array($the_['function'], $args);
                }

        } while (next($this->filters['all']) !== false);
    }
}
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