package cc.mrbird.febs.common.authentication;

import cc.mrbird.febs.system.entity.Menu;
import cc.mrbird.febs.system.entity.Role;
import cc.mrbird.febs.system.entity.User;
import cc.mrbird.febs.system.service.IMenuService;
import cc.mrbird.febs.system.service.IRoleService;
import cc.mrbird.febs.system.service.IUserDataPermissionService;
import cc.mrbird.febs.system.service.IUserService;
import org.apache.commons.lang3.StringUtils;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.*;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.subject.PrincipalCollection;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;

/**
 * 自定义实现 ShiroRealm，包含认证和授权两大模块
 *
 * @author MrBird
 */
@Component
public class ShiroRealm extends AuthorizingRealm {

    private IUserService userService;
    private IRoleService roleService;
    private IMenuService menuService;
    private IUserDataPermissionService userDataPermissionService;

    @Autowired
    public void setMenuService(IMenuService menuService) {
        this.menuService = menuService;
    }
    @Autowired
    public void setUserService(IUserService userService) {
        this.userService = userService;
    }
    @Autowired
    public void setRoleService(IRoleService roleService) {
        this.roleService = roleService;
    }
    @Autowired
    public void setUserDataPermissionService(IUserDataPermissionService userDataPermissionService) {
        this.userDataPermissionService = userDataPermissionService;
    }

    /**
     * 授权模块，获取用户角色和权限
     *
     * @param principal principal
     * @return AuthorizationInfo 权限信息
     */
    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principal) {
        User user = (User) SecurityUtils.getSubject().getPrincipal();
        String userName = user.getUsername();

        SimpleAuthorizationInfo simpleAuthorizationInfo = new SimpleAuthorizationInfo();

        // 获取用户角色集
        List<Role> roleList = this.roleService.findUserRole(userName);
        Set<String> roleSet = roleList.stream().map(Role::getRoleName).collect(Collectors.toSet());
        simpleAuthorizationInfo.setRoles(roleSet);

        // 获取用户权限集
        List<Menu> permissionList = this.menuService.findUserPermissions(userName);
        Set<String> permissionSet = permissionList.stream().map(Menu::getPerms).collect(Collectors.toSet());
        simpleAuthorizationInfo.setStringPermissions(permissionSet);
        return simpleAuthorizationInfo;
    }

    /**
     * 用户认证
     *
     * @param token AuthenticationToken 身份认证 token
     * @return AuthenticationInfo 身份认证信息
     * @throws AuthenticationException 认证相关异常
     */
    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken token) throws AuthenticationException {
        // 获取用户输入的用户名和密码
        String username = (String) token.getPrincipal();
        String password = new String((char[]) token.getCredentials());

        // 通过用户名到数据库查询用户信息
        User user = this.userService.findByName(username);
        
        if (user == null || !StringUtils.equals(password, user.getPassword())) {
            throw new IncorrectCredentialsException("用户名或密码错误！");
        }
        if (User.STATUS_LOCK.equals(user.getStatus())) {
            throw new LockedAccountException("账号已被锁定,请联系管理员！");
        }
        String deptIds = this.userDataPermissionService.findByUserId(String.valueOf(user.getUserId()));
        user.setDeptIds(deptIds);
        return new SimpleAuthenticationInfo(user, password, getName());
    }

    /**
     * 清除当前用户权限缓存
     * 使用方法：在需要清除用户权限的地方注入 ShiroRealm,
     * 然后调用其 clearCache方法。
     */
    public void clearCache() {
        PrincipalCollection principals = SecurityUtils.getSubject().getPrincipals();
        super.clearCache(principals);
    }
}