package com.shkpr.service.alambizplugin.bizservice;

import com.global.base.log.LogLevelFlag;
import com.global.base.log.LogPrintMgr;
import com.shkpr.service.alambizplugin.apiparam.GisSurveyCheckParams;
import com.shkpr.service.alambizplugin.commproperties.GisSurveySystemCheckProperties;
import com.shkpr.service.alambizplugin.components.GisSurveySystemCheckResultManager;
import com.shkpr.service.alambizplugin.components.GisSurveySystemChecker;
import com.shkpr.service.alambizplugin.constants.GisSurveyCheckStatusEnum;
import com.shkpr.service.alambizplugin.constants.GisSurveyCheckTypeEnum;
import com.shkpr.service.alambizplugin.constants.LogFlagBusiType;
import com.shkpr.service.alambizplugin.dbdao.services.intef.GisSurveyJobInfoService;
import com.shkpr.service.alambizplugin.dbdao.services.intef.GisSurveyProjectInfoService;
import com.shkpr.service.alambizplugin.dto.GisSurveySystemCheckId;
import com.shkpr.service.alambizplugin.dto.GisSurveySystemCheckResult;
import com.shkpr.service.alambizplugin.dto.GisSurveySystemCheckSubtask;
import org.springframework.stereotype.Component;
import org.springframework.util.concurrent.ListenableFuture;

import java.time.Duration;
import java.time.LocalDateTime;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ExecutionException;
import java.util.stream.Collectors;

/**
 * 系统检查管理service
 *
 * @author 欧阳劲驰
 * @since 1.0.0
 */
@Component
public class GisSurveySystemCheckBizService {
    /**
     * 任务缓存
     */
    private final static Map<GisSurveySystemCheckId, ListenableFuture<GisSurveySystemCheckResult>> TASK_CACHE = new ConcurrentHashMap<>();
    /**
     * 子任务缓存
     */
    private final static Map<GisSurveySystemCheckId, GisSurveySystemCheckSubtask> SUBTASK_CACHE = new ConcurrentHashMap<>();

    /**
     * 开始时间缓存
     */
    private final static Map<GisSurveySystemCheckId, LocalDateTime> TIME_CACHE = new ConcurrentHashMap<>();
    /**
     * log
     */
    private final String mStrClassName;
    private final String mBizType;

    private final GisSurveySystemCheckProperties systemCheckProperties;
    private final GisSurveySystemCheckResultManager systemCheckFileManager;
    private final GisSurveySystemChecker systemChecker;
    private final GisSurveyProjectInfoService projectInfoService;
    private final GisSurveyJobInfoService jobInfoService;

    public GisSurveySystemCheckBizService(GisSurveySystemCheckProperties systemCheckProperties, GisSurveySystemCheckResultManager systemCheckFileManager
            , GisSurveySystemChecker systemChecker, GisSurveyProjectInfoService projectInfoService, GisSurveyJobInfoService jobInfoService) {
        mStrClassName = "GisSurveySystemCheckBizService";
        mBizType = LogFlagBusiType.BUSI_GIS_SURVEY.toStrValue();
        this.systemCheckProperties = systemCheckProperties;
        this.systemCheckFileManager = systemCheckFileManager;
        this.systemChecker = systemChecker;
        this.projectInfoService = projectInfoService;
        this.jobInfoService = jobInfoService;
    }

    /**
     * 系统检查
     *
     * @param params 系统检查参数
     * @return 检查状态
     */
    public GisSurveySystemCheckResult sysCheckFun(GisSurveyCheckParams params) {
        //系统检查id
        GisSurveySystemCheckId systemCheckId = GisSurveySystemCheckId.generateId(params);
        if (systemCheckId == null) return GisSurveySystemCheckResult.notExists(params);
        //获取已存在的任务
        ListenableFuture<GisSurveySystemCheckResult> previousFuture = TASK_CACHE.get(systemCheckId);
        //如任务已完成,则检查历史失败
        if (!params.getIgnoreFail() && previousFuture != null && previousFuture.isDone()) {
            try {
                //获取结果,并检查失败
                GisSurveySystemCheckResult gisSurveySystemCheckResult = previousFuture.get();
                if (Objects.equals(gisSurveySystemCheckResult.getCheckStatus(), GisSurveyCheckStatusEnum.FAIL.getCode()))
                    return gisSurveySystemCheckResult;
            } catch (InterruptedException | ExecutionException e) {
                //打印报错信息(不太可能走到这)
                LogPrintMgr.getInstance().printLogMsg(LogLevelFlag.LOG_ERROR, mBizType, mStrClassName
                        , String.format("检查历史失败异常 系统检查id:%s msg:%s", systemCheckId, e.getMessage())
                );
            }

        }

        //获取已存在的结果
        GisSurveySystemCheckResult result = systemCheckFileManager.getResult(systemCheckId);
        //获取元素更新时间
        LocalDateTime refreshTime = getRefreshTimeDuration(systemCheckId);
        //回填元素更新时间
        params.setRefreshTime(refreshTime);
        //判断结果是否存在
        if (result != null) {
            //判断时间间隔,如滞后未到临界,则直接返回结果
            if (result.getRefreshTime() != null && refreshTime != null) {
                //结果滞后数据库的时间
                Duration lags = Duration.between(result.getRefreshTime(), refreshTime);
                //规定滞后时间大于真实滞后时间,直接返回结果
                if (systemCheckProperties.getResultLagDuration().compareTo(lags) >= 0) {
                    return result;
                }
            }
        }

        //系统检查子任务
        GisSurveySystemCheckSubtask checkSubtask = SUBTASK_CACHE.get(systemCheckId);
        //进行中判断(未完成且未清除)
        if (previousFuture != null && !previousFuture.isDone() && !previousFuture.isCancelled())
            return GisSurveySystemCheckResult.inProgress(params, checkSubtask, TIME_CACHE.get(systemCheckId));
        //启动检查任务
        if (Boolean.TRUE.equals(params.getCheckStart())) {
            startTask(systemCheckId, params);
            //如需要返回上次结果,则直接返回结果
            if (Boolean.TRUE.equals(params.getReturnLastResult())) {
                return result;
            }
            //返回进行中
            return GisSurveySystemCheckResult.inProgress(params, checkSubtask, LocalDateTime.now());
        }
        //未启动返回结果
        return result;
    }

    /**
     * 取消检查
     *
     * @param params 系统检查参数
     * @return 检查结果(可能进行中)
     */
    public GisSurveySystemCheckResult cancelCheck(GisSurveyCheckParams params) {
        //任务标识
        GisSurveySystemCheckId taskId = GisSurveySystemCheckId.generateId(params);
        if (taskId == null) return GisSurveySystemCheckResult.fail(params);
        //如无缓存,则直接返回不存在
        if (!TASK_CACHE.containsKey(taskId)) return GisSurveySystemCheckResult.notExists(params);
        //关闭检查任务
        return stopTask(taskId) ? GisSurveySystemCheckResult.success(params) : GisSurveySystemCheckResult.fail(params);
    }

    /**
     * 过期任务
     * <p>用于检查和使任务过期</p>
     */
    public void expireResult(Duration ttl) {
        //获取超时的id
        List<GisSurveySystemCheckId> systemCheckIds = TIME_CACHE.entrySet().stream()
                .filter(entry ->
                        Duration.between(entry.getValue(), LocalDateTime.now()).compareTo(ttl) > 0
                )
                .map(Map.Entry::getKey)
                .collect(Collectors.toList());
        //停止超时的任务并删除任务缓存
        for (GisSurveySystemCheckId systemCheckId : systemCheckIds) {
            //如任务不存在,则删除时间缓存
            if (!TASK_CACHE.containsKey(systemCheckId)) TIME_CACHE.remove(systemCheckId);
            //停用缓存
            if (stopTask(systemCheckId)) TIME_CACHE.remove(systemCheckId);
            else {
                //打印报错信息
                LogPrintMgr.getInstance().printLogMsg(LogLevelFlag.LOG_ERROR, mBizType, mStrClassName
                        , String.format(
                                "过期任务停止失败 ttl:%s 系统检查id:%s"
                                , ttl
                                , systemCheckId
                        )
                );
            }
        }
    }

    /**
     * 获取更新时间
     *
     * @param systemCheckId 系统检查id
     * @return 元素更新时间
     */
    private LocalDateTime getRefreshTimeDuration(GisSurveySystemCheckId systemCheckId) {
        //默认为当前时间
        LocalDateTime refreshTime = LocalDateTime.now();
        //根据检查维度获取数据库里的更新时间
        if (systemCheckId.getCheckType() == GisSurveyCheckTypeEnum.PROJECT)
            refreshTime = projectInfoService.findRefreshTimeByUid(systemCheckId.getCode());
        if (systemCheckId.getCheckType() == GisSurveyCheckTypeEnum.JOB)
            refreshTime = jobInfoService.findRefreshTimeByUid(systemCheckId.getCode());
        return refreshTime;
    }

    /**
     * 启动任务
     *
     * @param systemCheckId 系统检查id
     * @param params        检查参数
     */
    private void startTask(GisSurveySystemCheckId systemCheckId, GisSurveyCheckParams params) {
        //获取已存在的任务
        ListenableFuture<GisSurveySystemCheckResult> previousFuture = TASK_CACHE.get(systemCheckId);
        //已结束判断,删除缓存
        if (previousFuture != null && (previousFuture.isDone() || previousFuture.isCancelled()))
            removeCache(systemCheckId);
        //异步执行系统检查任务
        ListenableFuture<GisSurveySystemCheckResult> checkFuture = systemChecker.systemCheckTask(params,
                //缓存子任务句柄
                subtask -> SUBTASK_CACHE.put(systemCheckId, subtask),
                //删除子任务句柄
                subtaskSystemCheckId -> SUBTASK_CACHE.remove(systemCheckId)
        );
        //缓存任务句柄
        TASK_CACHE.put(systemCheckId, checkFuture);
        //缓存时间
        TIME_CACHE.put(systemCheckId, LocalDateTime.now());
    }

    /**
     * 停止任务
     *
     * @param systemCheckId 系统检查id
     * @return 关闭状态
     */
    private Boolean stopTask(GisSurveySystemCheckId systemCheckId) {
        ListenableFuture<GisSurveySystemCheckResult> future = TASK_CACHE.get(systemCheckId);
        //完成判断,完成删除缓存
        if (future.isCancelled() || future.isDone()) {
            removeCache(systemCheckId);
            return true;
        }
        //尝试清除任务
        boolean cancel = future.cancel(true);
        //清除成功,删除缓存
        if (cancel) {
            removeCache(systemCheckId);
            return true;
        }
        return false;
    }

    /**
     * 清除缓存
     *
     * @param systemCheckId 系统检查id
     */
    private void removeCache(GisSurveySystemCheckId systemCheckId) {
        TASK_CACHE.remove(systemCheckId);
        SUBTASK_CACHE.remove(systemCheckId);
        TIME_CACHE.remove(systemCheckId);
    }
}