package com.vincent.rsf.server.system.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.vincent.rsf.framework.common.Cools;
import com.vincent.rsf.server.common.domain.BaseParam;
import com.vincent.rsf.server.common.domain.PageParam;
import com.vincent.rsf.server.common.domain.PageResult;
import com.vincent.rsf.server.system.entity.User;
import com.vincent.rsf.server.system.mapper.UserMapper;
import com.vincent.rsf.server.system.service.RoleMenuService;
import com.vincent.rsf.server.system.service.UserRoleService;
import com.vincent.rsf.server.system.service.UserService;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.stream.Collectors;

@Service("userService")
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements UserService {

    /** 批量查询缓存：key = 排序后的 ids 拼接，value = (过期时间戳, 用户列表)，TTL 5 分钟 */
    private static final long CACHE_TTL_MS = 5 * 60 * 1000L;
    private static final ConcurrentHashMap<String, CacheEntry<List<User>>> USER_MANY_CACHE = new ConcurrentHashMap<>(64);

    @Resource
    private UserRoleService userRoleService;
    @Resource
    private RoleMenuService roleMenuService;
    @Resource
    private BCryptPasswordEncoder bCryptPasswordEncoder;

    @Override
    public PageResult<User> pageRel(PageParam<User, BaseParam> pageParam) {
        return new PageResult<>(this.baseMapper.selectPageRel(pageParam, pageParam.checkoutMap()), pageParam.getTotal());
    }

    @Override
    public User getByUsername(String username, Long tenantId) {
        if (Cools.isEmpty(username)) {
            return null;
        }
        return baseMapper.selectByUsernameWithoutTenant(username, tenantId);
    }

    @Override
    public User getByEmail(String email, Long tenantId) {
        if (Cools.isEmpty(email)) {
            return null;
        }
        return baseMapper.selectByEmailWithoutTenant(email, tenantId);
    }

    @Override
    public User setUserAuthInfo(User user) {
        if (user != null) {
            user.setRoles(userRoleService.listByUserId(user.getId()));
            user.setAuthorities(roleMenuService.listMenuByUserId(user.getId(), null));
        }
        return user;
    }

    @Override
    public boolean comparePassword(String dbPassword, String inputPassword) {
        return bCryptPasswordEncoder.matches(inputPassword, dbPassword);
    }

    @Override
    public String encodePassword(String password) {
        return password == null ? null : bCryptPasswordEncoder.encode(password);
    }

    @Override
    public User selectByUsernameWithoutTenant(String username, Long tenantId) {
        return baseMapper.selectByUsernameWithoutTenant(username,tenantId);
    }

    @Override
    public List<User> listByIdsCached(Collection<Long> ids) {
        if (ids == null || ids.isEmpty()) {
            return Collections.emptyList();
        }
        String key = ids.stream().sorted().map(Object::toString).collect(Collectors.joining(","));
        long now = System.currentTimeMillis();
        CacheEntry<List<User>> entry = USER_MANY_CACHE.get(key);
        if (entry != null && entry.expireAt > now) {
            return entry.data;
        }
        List<User> list = listByIds(ids);
        USER_MANY_CACHE.put(key, new CacheEntry<>(now + CACHE_TTL_MS, list));
        return list;
    }

    private static class CacheEntry<T> {
        final long expireAt;
        final T data;
        CacheEntry(long expireAt, T data) {
            this.expireAt = expireAt;
            this.data = data;
        }
    }

}