package com.yupi.springbootinit.service.impl;

import cn.dev33.satoken.stp.StpUtil;
import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.date.DateUtil;
import com.yupi.springbootinit.common.ErrorCode;
import com.yupi.springbootinit.exception.BusinessException;
import com.yupi.springbootinit.mapper.SystemTenantMapper;
import com.yupi.springbootinit.model.dto.user.SystemUsersDTO;
import com.yupi.springbootinit.model.entity.SystemTenant;
import com.yupi.springbootinit.model.entity.SystemUsers;
import com.yupi.springbootinit.model.enums.CommonStatusEnum;
import com.yupi.springbootinit.model.enums.LoginSceneEnum;
import com.yupi.springbootinit.model.vo.user.SystemUsersVO;
import com.yupi.springbootinit.service.SystemUsersService;
import com.yupi.springbootinit.utils.DateUtils;
import com.yupi.springbootinit.utils.RedisUtils;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.amqp.core.*;
import org.springframework.amqp.rabbit.core.RabbitAdmin;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.time.LocalDate;
import java.time.ZoneId;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

/**
 * 登录相关业务实现类
 */
@Slf4j
@Service
@RequiredArgsConstructor
public class LoginService {

    /** 用户业务服务 */
    private final SystemUsersService usersService;

    /** 用于缓存 AI 登录状态的 RedisTemplate（布尔值） */
    @Resource
    private RedisTemplate<String, Boolean> redisTemplate;

    /** 已创建过 RabbitMQ 队列的租户 ID 集合，防止重复创建 */
    private final Set<String> created = ConcurrentHashMap.newKeySet();

    /** 用户事件使用的 HeadersExchange */
    private final HeadersExchange userHeadersExchange;

    /** RabbitMQ 管理组件 */
    @Resource
    private RabbitAdmin rabbitAdmin;

    /** 通用 Redis 工具类 */
    @Resource
    private RedisUtils redisUtils;

    @Resource
    private SystemTenantMapper tenantMapper;

    /**
     * 统一登录入口
     *
     * @param scene 登录场景（HOST / BIG_BROTHER / AI_CHAT）
     * @param dto   登录参数（用户名、密码、租户 ID）
     * @return 登录成功后的用户信息 + Token
     */
    public SystemUsersVO login(LoginSceneEnum scene, SystemUsersDTO dto) {
        // 1. 校验用户名、密码、状态、租户过期
        SystemUsers user = validateUser(dto);
        // 2. 按场景校验角色权限
        checkRole(scene, user.getId());

        // 3. AI_CHAT 场景专属逻辑：缓存登录状态并动态创建 RabbitMQ 队列
        if (scene.equals(LoginSceneEnum.AI_CHAT)) {
            // 记录该用户已登录 AI_CHAT
            redisTemplate.opsForValue().set("ai_login:" + user.getTenantId() + ":" + user.getId(), true);

            String queueName = "q.tenant." + user.getTenantId();
            // 若该租户队列尚未创建，则创建队列并绑定到 HeadersExchange
            if (created.add(String.valueOf(user.getTenantId()))) {
                Queue queue = QueueBuilder.durable(queueName).build();
                rabbitAdmin.declareQueue(queue);

                Map<String, Object> headers = Map.of("tenantId", user.getTenantId(), "x-match", "all");
                Binding binding = BindingBuilder
                        .bind(queue)
                        .to(userHeadersExchange)
                        .whereAll(headers)
                        .match();
                rabbitAdmin.declareBinding(binding);
            }
        }
        SystemTenant systemTenant = tenantMapper.selectById(user.getTenantId());

        // 5. Sa-Token 登录
        StpUtil.login(user.getId(), scene.getSaMode());
        switch (scene) {
            case AI_CHAT:
                StpUtil.renewTimeout(DateUtils.dateBetween(systemTenant.getAiExpireTime(),DateUtil.date()));
                break;
            case HOST:
                StpUtil.renewTimeout(DateUtils.dateBetween(systemTenant.getExpireTime(),DateUtil.date()));
                break;
            case BIG_BROTHER:
                StpUtil.renewTimeout(DateUtils.dateBetween(systemTenant.getBrotherExpireTime(),DateUtil.date()));
                break;
        }

        // 6. 封装返回数据
        SystemUsersVO vo = new SystemUsersVO();
        BeanUtil.copyProperties(user, vo);
        vo.setTokenName(StpUtil.getTokenName());
        vo.setTokenValue(StpUtil.getTokenValue());
        return vo;
    }

    /**
     * 校验用户登录信息
     *
     * @param dto 登录参数
     * @return 校验通过的用户实体
     * @throws BusinessException 校验失败时抛出
     */
    private SystemUsers validateUser(SystemUsersDTO dto) {
        SystemUsers user = usersService.getUserByUserName(dto.getUsername(), dto.getTenantId());
        if (user == null) {
            throw new BusinessException(ErrorCode.USERNAME_OR_PASSWORD_ERROR);
        }
        if (!usersService.isPasswordMatch(dto.getPassword(), user.getPassword())) {
            throw new BusinessException(ErrorCode.USERNAME_OR_PASSWORD_ERROR);
        }
        if (CommonStatusEnum.isDisable(Integer.valueOf(user.getStatus()))) {
            throw new BusinessException(ErrorCode.USER_DISABLE);
        }
        if (usersService.isExpired(dto.getTenantId())) {
            throw new BusinessException(ErrorCode.PACKAGE_EXPIRED);
        }
        return user;
    }

    /**
     * 按登录场景校验角色权限
     *
     * @param scene  登录场景
     * @param userId 用户 ID
     * @throws BusinessException 无权限时抛出
     */
    private void checkRole(LoginSceneEnum scene, Long userId) {
        Boolean pass = switch (scene) {
            case HOST -> usersService.checkCrawlRole(userId);
            case BIG_BROTHER -> usersService.checkbigBrotherlRole(userId);
            case AI_CHAT -> usersService.checkAiCHatLoginRole(userId);
        };
        if (!pass) {
            throw new BusinessException(ErrorCode.LOGIN_NOT_ALLOWED);
        }
    }

    /**
     * AI_CHAT 场景专属登出
     *
     * @param usersDTO 包含租户 ID 与用户 ID
     * @return 固定返回 true
     */
    public Boolean aiChatLogout(SystemUsersDTO usersDTO) {
        // 1. 删除 Redis 中该用户的 AI_CHAT 登录标记
        Boolean delete = redisTemplate.delete("ai_login:" + usersDTO.getTenantId() + ":" + usersDTO.getUserId());

        // 2. 使当前 Token 失效
        String tokenValue = StpUtil.getTokenValue();
        StpUtil.logoutByTokenValue(tokenValue);

        log.info("删除租户:{} 登录状态:{}", usersDTO.getTenantId(), delete);

        // 3. 若该租户下已无 AI_CHAT 在线用户，则删除队列
        if (!redisUtils.hasKeyByPrefix("ai_login:" + usersDTO.getTenantId())) {
            created.remove(String.valueOf(usersDTO.getTenantId()));
            boolean b = rabbitAdmin.deleteQueue("q.tenant." + usersDTO.getTenantId());
            log.info("删除租户:{} 队列删除状态：{}", usersDTO.getTenantId(), b);
        }
        return true;
    }

    /**
     * 通用登出（不区分场景）
     *
     * @return 固定返回 true
     */
    public Boolean logout() {
        String tokenValue = StpUtil.getTokenValue();
        Long loginId = (Long) StpUtil.getLoginId();
        StpUtil.logoutByTokenValue(tokenValue);
        log.info("用户:{} 登出成功", loginId);
        return true;
    }

}