<?php
namespace backend\logic;

use ReflectionClass;
use ReflectionException;
use ReflectionMethod;
use yii;

class PermissionManager
{
    /**
     * 获取app的已做标记控制器的权限
     * DESCRIBE 控制器描述,只有控制器的注释添加了该描述,才会自动匹配该控制器;使用例子:@DESCRIBE {controllerDescribe} DESCRIBE
     * ACTION 方法描述,只有控制器下action方法的注释添加了该描述,才会自动匹配该action方法;使用例子:@ACTION {actionDescribe} ACTION
     * 匹配控制器中actions的方法,需要添加id参数并且在标明含义,例子:
     * '{actionName}' => [
     *      'class' => 'xxx\xxx\xxx',
     *      'id' => '{actionDescribe}'
     * ]
     * @return array 返回已匹配到的权限。返回例子:[["{controllerDescribe}"=>["{actionDescribe}"=>"action route"]]]
     * @throws yii\base\InvalidConfigException
     * @throws ReflectionException
     */
    public static function getAppPermission()
    {
        $permission = [];
        $permission = self::getControllersAndActions($permission);  //获取该app的所有controller权限
        $permission = self::getModuleControllerAndAction($permission);  //获取该app引用module的所有controller权限
        return $permission;
    }

    /**
     * 获取app下controller已标记的action方法权限
     * 这个方法先是获取该app下controller的路径,控制器的命名空间,然后匹配该路径下面的所有控制器文件
     * 截取控制器文件的控制器基础名称,转换为相应url规则名称,拼接为相应类名
     * 根据控制器id,通过[[Module::createControllerByID]]方法实例化该控制器,最后通过[[PermissionManager::constructingPermissionArray]]获取所有已标记的权限
     * @param array $permission 权限数组
     * @return array 权限数组
     * @throws yii\base\InvalidConfigException
     * @throws ReflectionException
     */
    private static function getControllersAndActions($permission = [])
    {
        $dir = Yii::$app->getControllerPath();
        $nameSpace = Yii::$app->controllerNamespace . "\\";
        $fileList = glob($dir."/*Controller.php");
        foreach ($fileList as $file) {
            $baseName = substr(basename($file), 0, -14);

            //根据路由规则转换控制器名称
            $name = strtolower(preg_replace('/(?<![A-Z])[A-Z]/', ' \0', $baseName));
            $id = ltrim(str_replace(' ', '-', $name), '-');

            $className = $nameSpace . $baseName . 'Controller';
            $controller = Yii::$app->createControllerByID($id);
            $permission = self::constructingPermissionArray($controller, $className, $permission);
        }
        return $permission;
    }

    /**
     * 获取该app下关联module的已标记controller的权限
     * 这个方法通过[[Module::getModules]]获取该app下关联的module并循环
     * 去除gii和debug,通过[[Module::getModule]]获取子类module,获取命名空间,文件位置,然后匹配该路径下面的所有控制器文件
     * 截取控制器文件的控制器基础名称,转换为相应url规则名称,拼接为相应类名
     * 通过[[BaseYii::createObject]]实例化,最后通过[[PermissionManager::constructingPermissionArray]]获取所有已标记的权限
     * @param array $permission 权限数组
     * @return array 权限数组
     * @throws yii\base\InvalidConfigException
     * @throws ReflectionException
     */
    private static function getModuleControllerAndAction($permission = [])
    {
        foreach (Yii::$app->getModules() as $id => $child) {
            if(in_array($id, ['gii', 'debug'])) {
                continue;
            }
            $module = Yii::$app->getModule($id);
            $nameSpace = $module->controllerNamespace."\\";
            $dir = $module->controllerPath;
            $fileList = glob($dir."/*Controller.php");
            foreach ($fileList as $file) {
                $baseName = substr(basename($file), 0, -14);
                $name = strtolower(preg_replace('/(?<![A-Z])[A-Z]/', ' \0', $baseName));
                $id = $module->id.'/'.ltrim(str_replace(' ', '-', $name), '-');
                $className = $nameSpace . $baseName . 'Controller';
                $controller = Yii::createObject($className, [$id, $module]);
                $permission = self::constructingPermissionArray($controller, $className, $permission);
            }
        }
        return $permission;
    }

    /**
     * 构建权限数组
     * 根据类名,使用ReflectionClass方法获取该类的信息
     * 通过该类的注释,判断是否存在DESCRIBE标记,以此判断是否要记录该类的权限
     * 若存在标记,则通过[[PermissionManager::getActionsInController]]获取actions里面的方法权限数组,通过[[PermissionManager::getActionInController]]获取该类下面的action方法权限数组
     * @param $controllerObject
     * @param $className
     * @param array $permission 权限数组
     * @return array 权限数组
     * @throws ReflectionException
     */
    private static function constructingPermissionArray($controllerObject, $className, $permission = [])
    {
        $prefix = '/'.$controllerObject->id.'/';
        $reflection = new ReflectionClass($className);  //通过ReflectionClass方法获取该类的所有信息,包括参数方法等
        $controllerComment = $reflection->getDocComment();
        $controllerPregRes = preg_match("/(?<=@DESCRIBE ).*?(?= DESCRIBE)/", $controllerComment, $controllerDescribe);
        if ($controllerPregRes) {
            $permission = self::getActionsInController($controllerObject, $controllerDescribe, $prefix, $permission);
            $permission = self::getActionInController($className, $prefix, $controllerDescribe, $permission);
        }
        return $permission;
    }

    /**
     * 获取控制器类中actions的方法权限
     * 根据实例化的控制器类,获取actions的方法并且循环,方法存在id这个参数,则记录
     * 最后放回权限数组
     * @param $controllerObject
     * @param $controllerDescribe
     * @param $prefix
     * @param array $permission 权限数组
     * @return array 权限数组
     */
    private static function getActionsInController($controllerObject, $controllerDescribe, $prefix, $permission = [])
    {
        foreach ($controllerObject->actions() as $id => $item) {
            if (isset($item['id'])) {
                $permission[$controllerDescribe[0]][$item['id']] = $prefix . $id;
            }
        }
        return $permission;
    }

    /**
     * 获取控制器类中的action方法权限
     * 通过ReflectionClass方法获取所有的action方法,若注释中存在ACTION标记,则记录
     * @param $className
     * @param $prefix
     * @param $controllerDescribe
     * @param array $permission 权限数组
     * @return array 权限数组
     * @throws ReflectionException
     */
    private static function getActionInController($className, $prefix, $controllerDescribe, $permission = [])
    {
        $reflection = new ReflectionClass($className);  //通过ReflectionClass方法获取该类的所有信息,包括参数方法等
        foreach ($reflection->getMethods(ReflectionMethod::IS_PUBLIC) as $method) {
            //action的注释
            $actionComment = $method->getDocComment();
            $actionPregRes = preg_match("/(?<=@ACTION ).*?(?= ACTION)/", $actionComment, $actionDescribe);
            if ($actionPregRes) {
                $actionName = $method->getName();
                if ($actionName != 'actions' && strpos($actionName, 'action') === 0) {
                    $name = strtolower(preg_replace('/(?<![A-Z])[A-Z]/', ' \0', substr($actionName, 6)));
                    $id = $prefix . ltrim(str_replace(' ', '-', $name), '-');
                    $permission[$controllerDescribe[0]][$actionDescribe[0]] = $id;
                }
            }
        }
        return $permission;
    }
}