package com.train.service;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.train.entity.TrainAuditLog;
import com.train.entity.TrainPlan;
import com.train.mapper.TrainAuditLogMapper;
import com.train.mapper.TrainPlanMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.util.Date;
import java.util.List;

/**
 * T+ 跟进定时任务：每日定时扫描已提交 7 天行动计划的学员，
 * 相对计划提交日（T0）生成 T+1 / T+3 / T+7 提醒记录，落 audit_log（幂等）。
 * 骨架版本以落账为主，生产可在此处改为推送订阅消息（复用 SubscribeMessageService）。
 */
@Slf4j
@Component
public class FollowUpTask {

    @Resource
    private TrainPlanMapper trainPlanMapper;
    @Resource
    private TrainAuditLogMapper trainAuditLogMapper;

    private static final long DAY_MILLIS = 24L * 60 * 60 * 1000;

    /** 每日 09:30 执行（课后跟进节奏：T+1 成果合集 / T+3 补齐 / T+7 回访） */
    @Scheduled(cron = "0 30 9 * * ?")
    public void runFollowUp() {
        List<TrainPlan> plans = trainPlanMapper.selectList(
                new LambdaQueryWrapper<TrainPlan>().orderByAsc(TrainPlan::getSubmittedAt));
        Date now = new Date();
        for (TrainPlan plan : plans) {
            if (plan.getUid() == null || plan.getSubmittedAt() == null) {
                continue;
            }
            long elapsedDays = (now.getTime() - plan.getSubmittedAt().getTime()) / DAY_MILLIS;
            if (elapsedDays >= 1) {
                ensureLog(plan.getUid(), "followup_t1", "T+1 跟进提醒：课堂成果合集与照片已同步，请查收");
            }
            if (elapsedDays >= 3) {
                ensureLog(plan.getUid(), "followup_t3", "T+3 跟进提醒：未完成项建议补齐（三本账/自动化）");
            }
            if (elapsedDays >= 7) {
                ensureLog(plan.getUid(), "followup_t7", "T+7 回访：7 天行动计划完成度自检，欢迎约 1v1");
            }
        }
        log.info("FollowUpTask 完成一轮 T+ 跟进扫描，共 {} 条计划", plans.size());
    }

    /** 幂等写入 audit_log：同 action + targetId 已存在则跳过 */
    private void ensureLog(Long uid, String action, String detail) {
        Long exists = trainAuditLogMapper.selectCount(
                new LambdaQueryWrapper<TrainAuditLog>()
                        .eq(TrainAuditLog::getAction, action)
                        .eq(TrainAuditLog::getTargetId, uid));
        if (exists != null && exists > 0) {
            return;
        }
        TrainAuditLog entry = new TrainAuditLog();
        entry.setAction(action);
        entry.setActorUid(null);
        entry.setTargetType("user");
        entry.setTargetId(uid);
        entry.setDetail(detail);
        entry.setTs(new Date());
        trainAuditLogMapper.insert(entry);
    }
}