package com.sandu.ximon.admin.service;

import cn.hutool.core.collection.CollectionUtil;
import cn.hutool.core.util.StrUtil;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.github.pagehelper.PageHelper;
import com.sandu.common.enums.RoleLevelStatus;
import com.sandu.common.execption.BusinessException;
import com.sandu.common.execption.EntityExistException;
import com.sandu.common.service.impl.BaseServiceImpl;
import com.sandu.common.util.BeanConvertUtil;
import com.sandu.ximon.admin.param.RoleParam;
import com.sandu.ximon.admin.security.SecurityUtils;
import com.sandu.ximon.dao.domain.*;
import com.sandu.ximon.dao.mapper.RoleMapper;
import lombok.AllArgsConstructor;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.*;
import java.util.stream.Collectors;

/**
 * @author chenjiantian
 * @date 2021/4/25 19:15
 */
@Service
@AllArgsConstructor
public class RoleService extends BaseServiceImpl<RoleMapper, Role> {

    private final AdminRoleRelationService adminRoleRelationService;
    private final RoleMenuRelationService roleMenuRelationService;
    private final MenuService menuService;

    /**
     * 获取指定管理员的spring security权限认证列表
     */
    public Collection<GrantedAuthority> mapToGrantedAuthorities(Long adminId) {

        // 获取管理员的角色id
        List<Role> roles = listByAdminId(adminId);

        if (CollectionUtil.isEmpty(roles)) {
            throw new BusinessException("当前用户没有角色");
        }
        List<Long> roleIdList = roles.stream().map(Role::getId).collect(Collectors.toList());
        List<Long> menuIdList = roleMenuRelationService.list(Wrappers.lambdaQuery(RoleMenuRelation.class).in(RoleMenuRelation::getRoleId, roleIdList).select(RoleMenuRelation::getMenuId))
                .stream().map(RoleMenuRelation::getMenuId).distinct().collect(Collectors.toList());

        Set<String> menuPermissions = new HashSet<>();
        // 菜单权限
        if (CollectionUtil.isNotEmpty(menuIdList)) {
            List<Menu> menus = menuService.listByIds(menuIdList);
            Set<String> collect = menus.stream().filter(menu -> StrUtil.isNotBlank(menu.getPermission())).map(Menu::getPermission).collect(Collectors.toSet());
            menuPermissions.addAll(collect);
        }

        // 角色专属权限
        Set<String> rolePermissions = roles.stream().filter(role -> StrUtil.isNotBlank(role.getPermission())).map(Role::getPermission).collect(Collectors.toSet());

        menuPermissions.addAll(rolePermissions);

        return menuPermissions.stream().map(SimpleGrantedAuthority::new).collect(Collectors.toList());
    }


    /**
     * 获取某个管理员的角色列表
     */
    public List<Role> listByAdminId(Long adminId) {
        // 获取管理员的角色id
        List<AdminRoleRelation> list = adminRoleRelationService.list(Wrappers.lambdaQuery(AdminRoleRelation.class).eq(AdminRoleRelation::getAdminId, adminId).select(AdminRoleRelation::getRoleId));
        List<Long> roleIdList = list.stream().map(AdminRoleRelation::getRoleId).collect(Collectors.toList());
        if (CollectionUtil.isEmpty(roleIdList)) {
            return null;
        }
        return listByIds(roleIdList);
    }

    @Transactional(rollbackFor = Exception.class)
    public boolean addRole(RoleParam param) {
        Role role = new Role();
        role.setName(param.getName());
        role.setRemark(param.getRemark());
        role.setLevel(RoleLevelStatus.COMMON.getCode());
        if(!save(role)){
            throw new BusinessException("添加角色失败");
        }

        roleMenuRelationService.addRoleMenuList(role.getId(),param.getMenuIdList());

        return true;
    }

    @Transactional(rollbackFor = Exception.class)
    public boolean updateRole(Long roleId, RoleParam param) {
        Role role = getById(roleId);
        if (role == null) {
            throw new BusinessException("找不到角色信息");
        }
        assertLevels(role.getLevel());
        Role update = new Role();
        update.setId(roleId);
        update.setName(param.getName());
        update.setRemark(param.getRemark());
        if(!updateById(update)){
            throw new BusinessException("编辑角色失败");
        }
        roleMenuRelationService.remove(Wrappers.lambdaQuery(RoleMenuRelation.class).eq(RoleMenuRelation::getRoleId,roleId));

        roleMenuRelationService.addRoleMenuList(role.getId(),param.getMenuIdList());
        return true;
    }


    /**
     * 判断当前角色能不能操作目标用户 不行的话直接抛出异常
     * @param roleLevel 目标用户的最大角色
     * @return
     */
    public int assertLevels(Integer roleLevel) {
        Long userId = SecurityUtils.getUserId();
        List<Role> roles = listByAdminId(userId);
        if(CollectionUtil.isEmpty(roles)){
            throw new BusinessException("当前用户没有角色");
        }
        List<Integer> levels = roles.stream().map(Role::getLevel).collect(Collectors.toList());
        int min = Collections.min(levels);
        if (roleLevel != null) {
            if (roleLevel < min) {
                throw new BusinessException("权限不足，你的角色级别：" + min + "，低于操作的角色级别：" + roleLevel);
            }
        }
        return min;
    }

    public boolean delRole(Long roleId) {
        Role role = getById(roleId);
        if (role == null) {
            throw new BusinessException("找不到角色");
        }
        assertLevels(role.getLevel());
        List<AdminRoleRelation> list = adminRoleRelationService.list(Wrappers.lambdaQuery(AdminRoleRelation.class).eq(AdminRoleRelation::getRoleId, role));
        if(CollectionUtil.isNotEmpty(list)){
            throw new BusinessException("当前角色有管理员使用，无法删除");
        }
        roleMenuRelationService.remove(Wrappers.lambdaQuery(RoleMenuRelation.class).eq(RoleMenuRelation::getRoleId,roleId));
        return removeById(roleId);
    }

    public List<RoleDetail> listRole(int pageNo, int pageSize) {
        PageHelper.startPage(pageNo, pageSize);
        List<Long> roleIdList = list().stream().map(Role::getId).collect(Collectors.toList());
        if(CollectionUtil.isEmpty(roleIdList)){
            return null;
        }
        return baseMapper.listRole(roleIdList);
    }
}