package com.yunhai.flowcenter.service;

import com.yunhai.flowcenter.callback.CallbackProperties;
import com.yunhai.flowcenter.callback.CallbackPushService;
import com.yunhai.flowcenter.entity.FlwCallbackLog;
import com.yunhai.flowcenter.entity.FlwCallbackReg;
import com.yunhai.flowcenter.enums.FlwEnums;
import com.yunhai.flowcenter.repository.FlwCallbackLogRepository;
import com.yunhai.flowcenter.repository.FlwCallbackRegRepository;
import com.yunhai.platform.apistd.BizException;
import com.yunhai.platform.utils.exception.ErrorCode;
import com.yunhai.platform.utils.model.BasePageResult;
import lombok.RequiredArgsConstructor;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.util.List;
import java.util.UUID;

/**
 * 回调注册/推送日志/死信管理（概览 §9.2）：
 * 启停、secret 重置（重置后旧签名立即失效）、推送日志查询、死信列表与手工重推。
 */
@Service
@RequiredArgsConstructor
public class FlowCallbackAdminService {

    private final FlwCallbackRegRepository regRepository;
    private final FlwCallbackLogRepository logRepository;
    private final CallbackPushService pushService;
    private final CallbackProperties callbackProperties;

    public List<FlwCallbackReg> listRegs(Long schId) {
        return regRepository.findBySchIdOrderByUpdateTimeDesc(schId);
    }

    /** 启用/停用注册（停用后该注册不再收到推送，日志保留） */
    @Transactional
    public void setRegStatus(Long schId, Long regId, boolean enabled) {
        FlwCallbackReg reg = requireReg(schId, regId);
        reg.setStatus(enabled ? 0 : 1);
        regRepository.save(reg);
    }

    /** secret 重置：新 secret 下发（管理端展示一次，不回显存量） */
    @Transactional
    public String resetSecret(Long schId, Long regId) {
        FlwCallbackReg reg = requireReg(schId, regId);
        String secret = UUID.randomUUID().toString().replace("-", "").toLowerCase();
        reg.setSecret(secret);
        regRepository.save(reg);
        return secret;
    }

    /** 推送日志分页（状态/事件/办件筛选） */
    public BasePageResult<FlwCallbackLog> pageLogs(Long schId, Integer status, String event,
                                                   Long instanceId, Integer page, Integer size) {
        Page<FlwCallbackLog> p = logRepository.pageLogs(schId, status, event, instanceId,
                PageRequest.of(page == null || page < 1 ? 0 : page - 1,
                        size == null || size < 1 || size > 100 ? 10 : size));
        return new BasePageResult<>(p.getContent(), (int) p.getTotalElements(),
                page == null || page < 1 ? 1 : page,
                size == null || size < 1 || size > 100 ? 10 : size,
                p.getTotalPages(), p.hasNext());
    }

    /** 死信列表 */
    public BasePageResult<FlwCallbackLog> pageDead(Long schId, Integer page, Integer size) {
        Page<FlwCallbackLog> p = logRepository.findBySchIdAndStatusOrderByIdDesc(schId,
                FlwEnums.CallbackLogStatus.DEAD.getCode(),
                PageRequest.of(page == null || page < 1 ? 0 : page - 1,
                        size == null || size < 1 || size > 100 ? 10 : size));
        return new BasePageResult<>(p.getContent(), (int) p.getTotalElements(),
                page == null || page < 1 ? 1 : page,
                size == null || size < 1 || size > 100 ? 10 : size,
                p.getTotalPages(), p.hasNext());
    }

    /** 挂起列表：待推且 retryCount≥挂起阈值（持续重试中疑似消费方停机的可视入口） */
    public BasePageResult<FlwCallbackLog> pageHung(Long schId, Integer page, Integer size) {
        Page<FlwCallbackLog> p = logRepository.pageHung(schId, callbackProperties.getHangAlertRetries(),
                PageRequest.of(page == null || page < 1 ? 0 : page - 1,
                        size == null || size < 1 || size > 100 ? 10 : size));
        return new BasePageResult<>(p.getContent(), (int) p.getTotalElements(),
                page == null || page < 1 ? 1 : page,
                size == null || size < 1 || size > 100 ? 10 : size,
                p.getTotalPages(), p.hasNext());
    }

    /**
     * 管理端手工标记死信（持续重试语义下死信的唯一人工入口：人工判定事件无意义时止血）。
     * 标记后可经既有 rePush 复活。
     */
    @Transactional
    public void markDead(Long schId, Long logId) {
        FlwCallbackLog callbackLog = logRepository.findById(logId)
                .orElseThrow(() -> new BizException(ErrorCode.PARAM_ERROR, "推送日志不存在：" + logId));
        if (!schId.equals(callbackLog.getSchId())) {
            throw new BizException(ErrorCode.FORBIDDEN, "推送日志不属于该学校");
        }
        if (callbackLog.getStatus() != null
                && callbackLog.getStatus() == FlwEnums.CallbackLogStatus.SUCCESS.getCode()) {
            throw new BizException(ErrorCode.PARAM_ERROR, "已成功日志无需标记死信");
        }
        pushService.markDead(callbackLog, "管理端手工标记死信");
    }

    /** 手工重推（死信/失败日志）：置回待推并立即触发一次推送 */
    @Transactional
    public void rePush(Long schId, List<Long> logIds) {
        if (logIds == null || logIds.isEmpty()) {
            throw new BizException(ErrorCode.PARAM_ERROR, "请选择要重推的日志");
        }
        List<FlwCallbackLog> logs = logRepository.findByIdInAndSchId(logIds, schId);
        if (logs.size() != logIds.size()) {
            throw new BizException(ErrorCode.PARAM_ERROR, "存在不属于该校或不存在 dead/pending 日志");
        }
        for (FlwCallbackLog callbackLog : logs) {
            if (callbackLog.getStatus() == FlwEnums.CallbackLogStatus.SUCCESS.getCode()) {
                continue;
            }
            callbackLog.setStatus(FlwEnums.CallbackLogStatus.PENDING.getCode());
            callbackLog.setRetryCount(0);
            callbackLog.setNextRetryTime(LocalDateTime.now());
            logRepository.save(callbackLog);
        }
        logRepository.flush();
        for (FlwCallbackLog callbackLog : logs) {
            if (callbackLog.getStatus() != null) {
                pushService.pushAsync(callbackLog.getId());
            }
        }
    }

    private FlwCallbackReg requireReg(Long schId, Long regId) {
        FlwCallbackReg reg = regRepository.findById(regId)
                .orElseThrow(() -> new BizException(ErrorCode.PARAM_ERROR, "回调注册不存在：" + regId));
        if (!reg.getSchId().equals(schId)) {
            throw new BizException(ErrorCode.FORBIDDEN, "回调注册不属于该学校");
        }
        return reg;
    }
}