package com.ruoyi.common.security.service;

import java.util.Collection;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.stereotype.Service;
import org.springframework.util.CollectionUtils;
import org.springframework.util.PatternMatchUtils;
import org.springframework.util.StringUtils;
import com.ruoyi.common.security.domain.LoginUser;
import com.ruoyi.common.security.utils.SecurityUtils;

/**
 * 自定义权限实现
 * 
 * @author ruoyi
 */
@Service("ss")
public class PermissionService
{
    /** 所有权限标识 */
    private static final String ALL_PERMISSION = "*:*:*";

    /** 管理员角色权限标识 */
    private static final String SUPER_ADMIN = "admin";

    private static final String ROLE_DELIMETER = ",";

    private static final String PERMISSION_DELIMETER = ",";

    /**
     * 验证用户是否具备某权限
     * 
     * @param permission 权限字符串
     * @return 用户是否具备某权限
     */
    public boolean hasPermi(String permission)
    {
        if (StringUtils.isEmpty(permission))
        {
            return false;
        }
        LoginUser loginUser = SecurityUtils.getLoginUser();
        if (StringUtils.isEmpty(loginUser) || CollectionUtils.isEmpty(loginUser.getAuthorities()))
        {
            return false;
        }
        return hasPermissions(loginUser.getAuthorities(), permission);
    }

    /**
     * 验证用户是否不具备某权限，与 hasPermi逻辑相反
     *
     * @param permission 权限字符串
     * @return 用户是否不具备某权限
     */
    public boolean lacksPermi(String permission)
    {
        return hasPermi(permission) != true;
    }

    /**
     * 验证用户是否具有以下任意一个权限
     *
     * @param permissions 以 PERMISSION_NAMES_DELIMETER 为分隔符的权限列表
     * @return 用户是否具有以下任意一个权限
     */
    public boolean hasAnyPermi(String permissions)
    {
        if (StringUtils.isEmpty(permissions))
        {
            return false;
        }
        LoginUser loginUser = SecurityUtils.getLoginUser();
        if (StringUtils.isEmpty(loginUser) || CollectionUtils.isEmpty(loginUser.getAuthorities()))
        {
            return false;
        }
        Collection<? extends GrantedAuthority> authorities = loginUser.getAuthorities();
        for (String permission : permissions.split(PERMISSION_DELIMETER))
        {
            if (permission != null && hasPermissions(authorities, permission))
            {
                return true;
            }
        }
        return false;
    }

    /**
     * 判断用户是否拥有某个角色
     * 
     * @param role 角色字符串
     * @return 用户是否具备某角色
     */
    public boolean hasRole(String role)
    {
        if (StringUtils.isEmpty(role))
        {
            return false;
        }
        LoginUser loginUser = SecurityUtils.getLoginUser();
        if (StringUtils.isEmpty(loginUser) || CollectionUtils.isEmpty(loginUser.getAuthorities()))
        {
            return false;
        }
        for (GrantedAuthority authorities : loginUser.getAuthorities())
        {
            String roleKey = authorities.getAuthority();
            if (SUPER_ADMIN.contains(roleKey) || roleKey.contains(role))
            {
                return true;
            }
        }
        return false;
    }

    /**
     * 验证用户是否不具备某角色，与 isRole逻辑相反。
     *
     * @param role 角色名称
     * @return 用户是否不具备某角色
     */
    public boolean lacksRole(String role)
    {
        return hasRole(role) != true;
    }

    /**
     * 验证用户是否具有以下任意一个角色
     *
     * @param roles 以 ROLE_NAMES_DELIMETER 为分隔符的角色列表
     * @return 用户是否具有以下任意一个角色
     */
    public boolean hasAnyRoles(String roles)
    {
        if (StringUtils.isEmpty(roles))
        {
            return false;
        }
        LoginUser loginUser = SecurityUtils.getLoginUser();
        if (StringUtils.isEmpty(loginUser) || CollectionUtils.isEmpty(loginUser.getAuthorities()))
        {
            return false;
        }
        for (String role : roles.split(ROLE_DELIMETER))
        {
            if (hasRole(role))
            {
                return true;
            }
        }
        return false;
    }

    /**
     * 判断是否包含权限
     * 
     * @param permissions 权限列表
     * @param permission 权限字符串
     * @return 用户是否具备某权限
     */
    private boolean hasPermissions(Collection<? extends GrantedAuthority> authorities, String permission)
    {
        return authorities.stream().map(GrantedAuthority::getAuthority).filter(StringUtils::hasText)
                .anyMatch(x -> ALL_PERMISSION.contains(x) || PatternMatchUtils.simpleMatch(permission, x));
    }
}