package com.tcm.training.admin.live.service;
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import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
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import com.tcm.training.admin.app.notice.service.AppSystemNoticeDispatchCommand;
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import com.tcm.training.admin.app.notice.service.AppSystemNoticeDispatchService;
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import com.tcm.training.admin.app.notice.service.AppSystemNoticeType;
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import com.tcm.training.admin.app.settings.entity.AppUserNotificationSetting;
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import com.tcm.training.admin.app.settings.mapper.AppUserNotificationSettingMapper;
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import com.tcm.training.admin.live.entity.LiveCourse;
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import com.tcm.training.admin.live.entity.LiveReserve;
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import com.tcm.training.admin.live.entity.LiveSession;
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import com.tcm.training.admin.live.mapper.LiveCourseMapper;
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import com.tcm.training.admin.live.mapper.LiveReserveMapper;
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import com.tcm.training.admin.live.mapper.LiveSessionMapper;
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import org.springframework.scheduling.annotation.Scheduled;
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import org.springframework.stereotype.Service;
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import java.time.LocalDateTime;
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import java.util.LinkedHashMap;
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import java.util.List;
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import java.util.Map;
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/**
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* 直播提醒通知分发服务。
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*/
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@Service
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public class LiveRemindDispatchService {
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private final LiveSessionMapper liveSessionMapper;
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private final LiveReserveMapper liveReserveMapper;
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private final LiveCourseMapper liveCourseMapper;
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private final AppUserNotificationSettingMapper appUserNotificationSettingMapper;
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private final AppSystemNoticeDispatchService appSystemNoticeDispatchService;
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/**
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* 注入直播提醒分发所需依赖。
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*/
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public LiveRemindDispatchService(LiveSessionMapper liveSessionMapper,
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LiveReserveMapper liveReserveMapper,
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LiveCourseMapper liveCourseMapper,
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AppUserNotificationSettingMapper appUserNotificationSettingMapper,
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AppSystemNoticeDispatchService appSystemNoticeDispatchService) {
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this.liveSessionMapper = liveSessionMapper;
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this.liveReserveMapper = liveReserveMapper;
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this.liveCourseMapper = liveCourseMapper;
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this.appUserNotificationSettingMapper = appUserNotificationSettingMapper;
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this.appSystemNoticeDispatchService = appSystemNoticeDispatchService;
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}
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/**
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* 定时扫描即将开播的预约用户，并按用户设置的提前提醒时间发放通知。
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*/
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@Scheduled(fixedDelayString = "${app.live.remind-dispatch-interval-ms:60000}")
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public void dispatchScheduledReminds() {
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LocalDateTime now = LocalDateTime.now();
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List<LiveSession> sessions = liveSessionMapper.selectList(new LambdaQueryWrapper<LiveSession>()
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.eq(LiveSession::getDeleted, 0)
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.eq(LiveSession::getLiveStatus, 0)
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.isNotNull(LiveSession::getStartTime)
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.gt(LiveSession::getStartTime, now)
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.orderByAsc(LiveSession::getStartTime)
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.orderByAsc(LiveSession::getId));
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for (LiveSession session : sessions) {
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dispatchRemindsForSession(session, now, false);
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}
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}
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/**
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* 手动触发指定场次的直播提醒发放。
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*/
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public long dispatchManualRemind(LiveSession session) {
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if (session == null) {
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return 0L;
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}
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return dispatchRemindsForSession(session, LocalDateTime.now(), true);
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}
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/**
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* 根据预约记录与提醒时间配置发放直播提醒。
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*/
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private long dispatchRemindsForSession(LiveSession session, LocalDateTime now, boolean ignoreReminderWindow) {
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if (session == null || session.getId() == null || session.getStartTime() == null) {
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return 0L;
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}
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List<LiveReserve> reserves = liveReserveMapper.selectList(new LambdaQueryWrapper<LiveReserve>()
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.eq(LiveReserve::getSessionId, session.getId())
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.eq(LiveReserve::getIsCancel, 0));
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if (reserves.isEmpty()) {
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return 0L;
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}
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LiveCourse liveCourse = liveCourseMapper.selectById(session.getLiveCourseId());
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long dispatchedCount = 0L;
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for (LiveReserve reserve : reserves) {
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if (reserve.getUserId() == null) {
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continue;
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}
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Integer advanceMinutes = resolveAdvanceMinutes(reserve.getUserId());
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if (!ignoreReminderWindow && !isWithinReminderWindow(session.getStartTime(), now, advanceMinutes)) {
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continue;
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}
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AppSystemNoticeDispatchCommand command = new AppSystemNoticeDispatchCommand();
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command.setAppUserId(reserve.getUserId());
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command.setNoticeTypeCode(AppSystemNoticeType.LIVE_REMIND);
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command.setTitle("直播提醒");
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command.setContent(defaultCourseTitle(liveCourse) + " 即将开播");
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command.setReferenceType("LIVE_SESSION");
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command.setReferenceId(session.getId());
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command.setRequireUserSetting(Boolean.TRUE);
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Map<String, String> payload = new LinkedHashMap<String, String>();
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payload.put("courseId", session.getLiveCourseId() == null ? "" : String.valueOf(session.getLiveCourseId()));
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payload.put("sessionId", String.valueOf(session.getId()));
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payload.put("startTime", String.valueOf(session.getStartTime()));
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payload.put("courseTitle", defaultCourseTitle(liveCourse));
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command.setPayload(payload);
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appSystemNoticeDispatchService.createAndPush(command);
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dispatchedCount++;
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}
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return dispatchedCount;
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}
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/**
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* 读取用户设置的提前提醒分钟数，未配置时默认按 60 分钟处理。
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*/
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private Integer resolveAdvanceMinutes(Long appUserId) {
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AppUserNotificationSetting setting = appUserNotificationSettingMapper.selectOne(new LambdaQueryWrapper<AppUserNotificationSetting>()
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.eq(AppUserNotificationSetting::getAppUserId, appUserId)
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.eq(AppUserNotificationSetting::getDeleted, 0)
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.last("limit 1"));
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if (setting == null || setting.getAdvanceNoticeMinutes() == null || setting.getAdvanceNoticeMinutes().intValue() <= 0) {
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return 60;
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}
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return setting.getAdvanceNoticeMinutes();
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}
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/**
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* 判断当前时间是否已进入当前用户对应的提醒发送窗口。
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*/
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private boolean isWithinReminderWindow(LocalDateTime startTime, LocalDateTime now, Integer advanceMinutes) {
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if (startTime == null || now == null) {
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return false;
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}
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LocalDateTime remindTime = startTime.minusMinutes(advanceMinutes == null ? 60L : advanceMinutes.longValue());
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return !now.isBefore(remindTime) && now.isBefore(startTime);
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}
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/**
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* 返回安全的直播课程标题。
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*/
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private String defaultCourseTitle(LiveCourse liveCourse) {
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if (liveCourse == null || liveCourse.getTitle() == null) {
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return "您预约的直播";
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}
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return liveCourse.getTitle();
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}
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}
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