package net.yyc.quartz.service.impl;

import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import net.yyc.quartz.entity.JobBriefing;
import net.yyc.quartz.entity.SysJob;
import net.yyc.quartz.mapper.JobBriefingMapper;
import net.yyc.quartz.service.JobBriefingService;
import net.yyc.quartz.service.SysJobService;
import org.springframework.stereotype.Service;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.*;
import java.util.stream.Collectors;

/**
 * 每日简报服务实现
 */
@Slf4j
@Service
@RequiredArgsConstructor
public class JobBriefingServiceImpl implements JobBriefingService {

    private final JobBriefingMapper jobBriefingMapper;
    private final SysJobService sysJobService;

    @Override
    public JobBriefing generateBriefing(LocalDate date) {
        LocalDateTime startTime = date.atStartOfDay();
        LocalDateTime endTime = date.atTime(LocalTime.MAX);

        // 1. 获取昨日执行的任务列表
        List<Integer> executedJobIds = jobBriefingMapper.selectExecutedJobIds(startTime, endTime);

        // 2. 获取当前运行中的任务
        List<SysJob> runningJobs = sysJobService.list(null);
        if (runningJobs == null) {
            runningJobs = Collections.emptyList();
        }
        List<SysJob> runningJobList = runningJobs.stream()
                .filter(job -> "2".equals(job.getJobStatus()))
                .collect(Collectors.toList());

        // 3. 计算任务列表并集（昨日执行 + 当前运行中）
        Set<Integer> allJobIds = new HashSet<>();
        allJobIds.addAll(executedJobIds);
        runningJobList.forEach(job -> allJobIds.add(job.getJobId()));

        // 4. 获取任务ID到任务的映射
        Map<Integer, SysJob> jobMap = new HashMap<>();
        for (SysJob job : runningJobList) {
            jobMap.put(job.getJobId(), job);
        }

        // 5. 查询昨日执行统计
        List<Map<String, Object>> statSummary = jobBriefingMapper.selectJobStatSummary(startTime, endTime);
        Map<Integer, Map<String, Object>> statMap = new HashMap<>();
        for (Map<String, Object> stat : statSummary) {
            Integer jobId = ((Number) stat.get("job_id")).intValue();
            statMap.put(jobId, stat);
        }

        // 6. 构建任务统计列表
        List<JobBriefing.JobStatInfo> jobStats = new ArrayList<>();
        for (Integer jobId : allJobIds) {
            SysJob sysJob = jobMap.get(jobId);
            Map<String, Object> stat = statMap.get(jobId);

            String jobName = sysJob != null ? sysJob.getJobName() : String.valueOf(stat != null ? stat.get("job_name") : "未知");
            String jobGroup = sysJob != null ? sysJob.getJobGroup() : String.valueOf(stat != null ? stat.get("job_group") : "未知");

            int execCount = 0, successCount = 0, failCount = 0;
            long avgExecuteTime = 0;
            String lastExecuteTime = null;
            String lastExecStatus = null;
            String exceptionInfo = null;

            if (stat != null) {
                execCount = ((Number) stat.get("execCount")).intValue();
                successCount = ((Number) stat.get("successCount")).intValue();
                failCount = ((Number) stat.get("failCount")).intValue();
                Object avgObj = stat.get("avgExecuteTime");
                if (avgObj != null) {
                    avgExecuteTime = ((Number) avgObj).longValue();
                }
                lastExecuteTime = stat.get("lastExecuteTime") != null
                        ? String.valueOf(stat.get("lastExecuteTime")) : null;
            }

            // 查询最新执行记录
            if (endTime != null) {
                Map<String, Object> lastLog = jobBriefingMapper.selectLastExecLog(jobId, LocalDateTime.now());
                if (lastLog != null) {
                    lastExecStatus = "1".equals(String.valueOf(lastLog.get("job_log_status"))) ? "失败" : "成功";
                    Object exInfo = lastLog.get("exception_info");
                    if (exInfo != null && !"null".equals(String.valueOf(exInfo))) {
                        exceptionInfo = String.valueOf(exInfo);
                        if (exceptionInfo.length() > 200) {
                            exceptionInfo = exceptionInfo.substring(0, 200) + "...";
                        }
                    }
                }
            }

            double successRate = execCount > 0 ? (double) successCount / execCount * 100 : 0;

            jobStats.add(JobBriefing.JobStatInfo.builder()
                    .jobId(jobId)
                    .jobName(jobName)
                    .jobGroup(jobGroup)
                    .execCount(execCount)
                    .successCount(successCount)
                    .failCount(failCount)
                    .successRate(Math.round(successRate * 100) / 100.0)
                    .avgExecuteTime(avgExecuteTime)
                    .lastExecuteTime(lastExecuteTime)
                    .lastExecStatus(lastExecStatus)
                    .exceptionInfo(exceptionInfo)
                    .build());
        }

        // 按任务名称排序
        jobStats.sort(Comparator.comparing(JobBriefing.JobStatInfo::getJobName));

        // 7. 检测错过执行的任务
        List<JobBriefing.MissedJobInfo> missedJobs = detectMissedJobs(date, startTime, endTime, executedJobIds, runningJobList);

        return JobBriefing.builder()
                .reportDate(date)
                .jobStats(jobStats)
                .missedJobs(missedJobs)
                .generatedAt(LocalDateTime.now())
                .build();
    }

    @Override
    public JobBriefing generateYesterdayBriefing() {
        return generateBriefing(LocalDate.now().minusDays(1));
    }

    /**
     * 检测错过执行的任务
     * 条件：任务状态=RUNNING(2) 且 next_time已过 且 昨日无执行记录
     */
    private List<JobBriefing.MissedJobInfo> detectMissedJobs(LocalDate date,
                                                              LocalDateTime startTime,
                                                              LocalDateTime endTime,
                                                              List<Integer> executedJobIds,
                                                              List<SysJob> runningJobList) {
        List<JobBriefing.MissedJobInfo> missed = new ArrayList<>();
        Set<Integer> executedSet = new HashSet<>(executedJobIds);
        LocalDateTime now = LocalDateTime.now();

        for (SysJob job : runningJobList) {
            // 跳过已删除的任务
            if ("4".equals(job.getJobStatus())) {
                continue;
            }

            // 检查昨日是否有执行记录
            if (executedSet.contains(job.getJobId())) {
                continue;
            }

            // 检查 next_time 是否已过
            if (job.getNextTime() != null && job.getNextTime().isBefore(now)) {
                missed.add(JobBriefing.MissedJobInfo.builder()
                        .jobName(job.getJobName())
                        .jobGroup(job.getJobGroup())
                        .nextExecuteTime(job.getNextTime() != null ? job.getNextTime().toString() : null)
                        .remark("下次执行时间已过，请检查任务调度")
                        .build());
            }
        }

        return missed;
    }
}