package com.mydreamjob.bidirectionalmatch;

import com.mydreamjob.application.Application;
import com.mydreamjob.application.ApplicationRepository;
import com.mydreamjob.auth.User;
import com.mydreamjob.auth.UserRepository;
import com.mydreamjob.company.Company;
import com.mydreamjob.company.CompanyRepository;
import com.mydreamjob.job.Job;
import com.mydreamjob.job.JobService;
import com.mydreamjob.notification.NotificationService;
import com.mydreamjob.profile.StudentProfile;
import com.mydreamjob.profile.StudentProfileRepository;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

/**
 * 匹配成功通知（Outbox 发送）。
 *
 * <p>由 {@code application_match_events} 中 MATCH_SUCCEEDED(PENDING) 事件驱动；
 * 通知通过 NotificationService.create 幂等键落库（同一 application 每方只产生一条），
 * 事件标记 SENT；任何失败保持 PENDING，由调度任务重试。重试不会重复发通知。
 * <b>REQUIRES_NEW</b>：afterCommit/调度器调用时若处于已完成的同步上下文，REQUIRED 会加入已完成事务
 * 导致通知不落库；独立事务保证通知总能提交。
 */
@Slf4j
@Service
@RequiredArgsConstructor
public class MatchNotificationService {

    public static final String TYPE_MATCH_SUCCEEDED = "MATCH_SUCCEEDED";

    private final ApplicationMatchEventRepository eventRepository;
    private final ApplicationMatchRecordRepository recordRepository;
    private final ApplicationRepository applicationRepository;
    private final JobService jobService;
    private final CompanyRepository companyRepository;
    private final StudentProfileRepository profileRepository;
    private final UserRepository userRepository;
    private final NotificationService notificationService;

    @Transactional(propagation = Propagation.REQUIRES_NEW)
    public void sendMatchSucceeded(Long applicationId) {
        ApplicationMatchEvent event = eventRepository
                .findByApplicationIdAndEventTypeAndDedupKey(applicationId,
                        ApplicationMatchEvent.EVENT_MATCH_SUCCEEDED,
                        ApplicationMatchEvent.EVENT_MATCH_SUCCEEDED)
                .orElse(null);
        if (event == null || ApplicationMatchEvent.NOTIFY_SENT.equals(event.getNotificationStatus())) {
            return; // 无事件或已发送
        }
        ApplicationMatchRecord record = recordRepository.findByApplicationId(applicationId).orElse(null);
        Application app = applicationRepository.findById(applicationId).orElse(null);
        if (record == null || app == null) return;

        Job job = jobService.getJob(record.getJobId());
        Company company = companyRepository.findById(record.getCompanyId()).orElse(null);
        String jobTitle = job.getTitle() != null ? job.getTitle() : "岗位";
        String companyName = company != null && company.getName() != null ? company.getName() : "企业";
        String candidateName = resolveCandidateName(record.getCandidateId());

        // 求职者
        notificationService.create(record.getCandidateId(), TYPE_MATCH_SUCCEEDED,
                "双向匹配成功",
                "你与「" + companyName + "」的岗位「" + jobTitle + "」已达成双向匹配，可与企业直聊",
                "MATCH", applicationId, "match-succeeded-" + applicationId + "-candidate");
        // 企业
        if (company != null) {
            notificationService.create(company.getOwnerUserId(), TYPE_MATCH_SUCCEEDED,
                    "双向匹配成功",
                    "候选人「" + candidateName + "」与你发布的岗位「" + jobTitle + "」已达成双向匹配，可与其直聊",
                    "MATCH", applicationId, "match-succeeded-" + applicationId + "-company");
        }
        event.setNotificationStatus(ApplicationMatchEvent.NOTIFY_SENT);
        eventRepository.save(event);
        log.info("MATCH_SUCCEEDED notification sent: applicationId={}", applicationId);
    }

    private String resolveCandidateName(Long candidateId) {
        StudentProfile profile = profileRepository.findByUserId(candidateId).orElse(null);
        if (profile != null && profile.getRealName() != null && !profile.getRealName().isBlank()) {
            return profile.getRealName();
        }
        User user = userRepository.findById(candidateId).orElse(null);
        if (user != null && user.getNickname() != null && !user.getNickname().isBlank()) {
            return user.getNickname();
        }
        return "候选人";
    }
}