<?php
/**
 * 权限模型 - 业务逻辑模型
 * @author Ty80 <e启学教育>
 * @version TS3.0
 */
class PermissionModel {
	
	static protected $permission = array();			// 当前用户所具有的权限列表

	/**
	 * 验证权限
	 * @param string $action 动作节点
	 * @return boolean 是否具有该动作节点的权限
	 */
	public function check($action) {
		// 验证时载入当前应用 - 模块的权限
		if(empty($this->option['app']) || empty($this->option['module'])) {
			return false;
		}
		// 判断是否为扩展应用
		if(!in_array($this->option['app'], array('core'))) {
			// 判断应用是否关闭
			$isOpen = model('App')->isAppNameOpen(strtolower($this->option['app']));
			if(!$isOpen) {
				return false;
			}
		}
		
		$permission = $this->loadRule($GLOBALS['ts']['mid']);
		if(isset($permission[$this->option['app']][$this->option['module']][$action])) {
			return true;
		}

		return false;
	}

	/**
	 * 设置需要加载权限的 应用 - 模块
	 * @param string $type 应用 - 模块
	 * @return object 配置后的权限对象
	 */
	public function load($type) {
		$type = explode('_', $type, 2);
		$this->option['app'] = $type[0];
		$this->option['module'] = $type[1];

		return $this;
	}

	/**
	 * 设置自定义组信息
	 * @param string $group 自定义用户组名称，例如：群组内成员必须设置为member，否则按其当前用户组权限判断
	 * @return object 配置后的权限对象
	 */
	public function group($group = false) {
		$this->option['group'] = $group;
		return $this;
	}
	
	/**
	 * 获取指定用户的权限集合
	 * @param integer $uid 用户ID
	 * @return array 指定用户的权限集合
	 */
	public function loadRule($uid) {
		if(empty($uid)) {
			return false;
		}
		
		if(empty(self::$permission[$uid])) {
			$permission = model('Cache')->get('perm_user_'.$uid);
			if(!$permission) {
				$userGroupids = model('UserGroupLink')->getUserGroup($uid);	
				$userGroupids[$uid] && $userGroup = model('UserGroup')->getUserGroup($userGroupids[$uid]);
				$permission = array();
				// 先处理应用内的用户组
				if(!empty($this->option['group'])) {
					$permission = $this->getGroupPermission($this->option['app'].'_'.$this->option['group']);
				}
				foreach($userGroup as $k => $v) {
					if($v['user_group_type'] == 1) {
						// 特殊组
						$permission = $this->getGroupPermission($v['user_group_id']);
						break;
					}
					$_p = $this->getGroupPermission($v['user_group_id']);
					// 追加到已有权限中
					foreach($_p as $app => $models) {
						foreach($models as $model => $d) {
							if(isset($permission[$app][$model])) {
								$permission[$app][$model] = array_merge($permission[$app][$model], $d);
							} else {
								$permission[$app][$model] = $d;
							}
						}
					}
				}
				model('Cache')->set('perm_user_'.$uid, $permission, 600);
			}
			self::$permission[$uid] = $permission;
		}

		return self::$permission[$uid];
	}

	/**
	 * 清除权限缓存
	 * @param string $key 权限相关Key值
	 * @return boolean 是否清除缓存成功
	 */
	public function cleanCache($key = '') {
		if(empty($key)) {
			$groupList = model('UserGroup')->getHashUsergroup();
			foreach($groupList as $k => $v) {
				model('Cache')->rm('perm_'.$k);
			}
		} else {
			model('Cache')->rm('perm_'.$key);
		}

		return true;
	}
	
	/**
	 * 获取权限节点列表，供后台使用
	 * @param integer $gid 用户组ID
	 * @param string $app 应用名称字段
	 * @param string $appgroup 应用中用户组字段
	 * @return array 权限节点列表
	 */
	public function getRuleList($gid, $app, $appgroup) {
		// $permissionFile = ADDON_PATH.'/lang/zh-cn/permission.xml';
		// $xml = simplexml_load_file( $permissionFile );
		// 权限节点获取
		$permData = D('permission_node')->order('module DESC')->findAll();
		$appHash = $permNode = $appGroup = array();

		foreach($permData as $v) {
			$permNode[$v['appname']][$v['module']][] = $v;
			$appHash[$v['appname']] = $v['appinfo'];
		}
		// 应用内部的权限组
		$appGroupData = D('permission_group')->findAll();
		foreach($appGroupData as $v) {
			$appGroup[$v['appname']][$v['appgroup']] = $v['appgroup_name'] ; 
		}
		
		if(!empty($app) && !empty($appgroup)) {	
			// 取出应用下的权限设置
			foreach($permNode as $a => $v) {
				if($a == $app) { 
					// 对应的APP下面
					foreach($appGroup[$a] as $group => $groupname) {
						if($group == $appgroup) {
							// 所查的组权限
							$groupInfo = array('user_group_name'=>$groupname, 'user_group_id'=>$app.'_'.$group);	
						}
					}

					$permission[$a]['info'] = $appHash[$a];

					foreach($v as $rules) {
						foreach($rules as $ruls) {
							$permission[$a]['module'][$rule['module']]['info'] = $rule['module'];
							$permission[$a]['module'][$rule['module']]['rule'][$rule['rule']] = $rule['ruleinfo'];
						}
					}
					break;
				}
			}
			$grouppermission = $this->getGroupPermission($app.'_'.$appgroup);
		} else {
			$groupInfo = model('UserGroup')->getUserGroup($gid);
			foreach($permNode as $a => $v) {
				$permission[$a]['info'] = $appHash[$a];
				foreach($v as $rules){
					foreach($rules as $rule){
						$permission[$a]['module'][$rule['module']]['info'] = $rule['module'];
						$permission[$a]['module'][$rule['module']]['rule'][$rule['rule']] = $rule['ruleinfo'];
					}
				}
			}
			$grouppermission = $this->getGroupPermission($gid);
		}
		
		return array('groupInfo'=>$groupInfo,'permission'=>$permission,'grouppermission'=>$grouppermission);
	}
	
	/**
	 * 获取指定用户组的权限
	 * @param string $key 用户组ID或者特殊应用下面的appname_appgroupname
	 * @return array 指定用户组的权限信息
	 */
	public function getGroupPermission($key) {
		static $permissionCache;
		if(!$permissionCache[$key]) {
			$cacheRule = model('Cache')->get('perm_'.$key);
			if(!$cacheRule) {
				$cacheRule = model('Xdata')->get('permission:'.$key);
				model('Cache')->set('perm_'.$key , $cacheRule );
			}
			$permissionCache[$key] = $cacheRule;
		}

		return $permissionCache[$key];
	}
	
	/**
	 * 设置指定用户组的权限信息
	 * @param string $key 用户组ID或者特殊应用下面的appname_appgroupname
	 * @param array $data 相关权限信息
	 * @return void
	 */
	public function setGroupPermission($key, $data) {
		model('Xdata')->put('permission:'.$key, $data);
		model('Cache')->set('perm_'.$key, $data);
		$userIds = D('user_group_link')->where('user_group_id='.$key)->field('uid')->findAll();
		foreach($userIds as $v){
			model('Cache')->rm('perm_user_'.$v['uid']);
		}
	}	
}