package com.labelsys.backend.service;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.labelsys.backend.common.ResultCode;
import com.labelsys.backend.common.exception.BusinessException;
import com.labelsys.backend.context.LoginUser;
import com.labelsys.backend.dto.request.MergeReviewResultRequest;
import com.labelsys.backend.dto.response.MergeReviewResultResponse;
import com.labelsys.backend.entity.AnnotationResult;
import com.labelsys.backend.entity.AnnotationResultHistory;
import com.labelsys.backend.enums.QaContentStorageMode;
import com.labelsys.backend.enums.UserPosition;
import com.labelsys.backend.mapper.AnnotationResultHistoryMapper;
import com.labelsys.backend.mapper.AnnotationResultMapper;
import com.labelsys.backend.util.IdGenerator;
import java.time.Duration;
import java.time.LocalDateTime;
import java.util.List;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

@Slf4j
@Service
@RequiredArgsConstructor
public class AnnotationResultArchiveService {

    private static final String MANUAL_ARCHIVE_REASON = "MANUAL_REVIEW";

    private final AnnotationResultMapper annotationResultMapper;
    private final AnnotationResultHistoryMapper annotationResultHistoryMapper;
    @Value("${labelsys.annotation.auto-archive-timeout:PT2H}")
    private Duration autoArchiveTimeout;

    @Transactional
    public MergeReviewResultResponse mergeReview(LoginUser currentUser, Long resultId, MergeReviewResultRequest request) {
        assertReviewer(currentUser);
        AnnotationResult result = annotationResultMapper.findActiveByIdAndCompanyId(resultId, currentUser.companyId());
        if (result == null) {
            throw new BusinessException(ResultCode.NOT_FOUND, "运行态结果不存在");
        }

        LocalDateTime archivedAt = LocalDateTime.now();
        AnnotationResultHistory history = AnnotationResultHistory.builder()
            .id(IdGenerator.nextId())
            .companyId(result.getCompanyId())
            .creatorId(result.getCreatorId())
            .creatorRole(result.getCreatorRole())
            .sourceResultId(result.getId())
            .taskId(result.getTaskId())
            .resourceId(result.getResourceId())
            .qaContentJson(request.qaContentJson())
            .qaContentStorageMode(resolveStorageMode(result))
            .qaContentFilePath(result.getQaContentFilePath())
            .archiveReason(MANUAL_ARCHIVE_REASON)
            .archivedBy(currentUser.userId())
            .archivedAt(archivedAt)
            .build();
        annotationResultHistoryMapper.insert(history);

        int updated = annotationResultMapper.markArchived(
            result.getId(),
            currentUser.companyId(),
            currentUser.userId(),
            request.reviewComment(),
            archivedAt);
        if (updated == 0) {
            throw new BusinessException(ResultCode.CONFLICT, "结果已被其他操作处理");
        }

        log.info("merged review result, companyId={}, reviewerId={}, resultId={}, historyId={}",
            currentUser.companyId(), currentUser.userId(), resultId, history.getId());
        return new MergeReviewResultResponse(resultId, history.getId(), MANUAL_ARCHIVE_REASON, archivedAt);
    }

    @Transactional
    public int autoArchiveEligibleResults() {
        LocalDateTime cutoff = LocalDateTime.now().minus(autoArchiveTimeout);
        List<AnnotationResult> results = annotationResultMapper.selectList(new LambdaQueryWrapper<AnnotationResult>()
            .eq(AnnotationResult::getIsDeleted, false)
            .eq(AnnotationResult::getRequiresManualReview, false)
            .lt(AnnotationResult::getCreatedAt, cutoff));
        int archivedCount = 0;
        for (AnnotationResult result : results) {
            if (archiveRuntimeResult(result, null, "AUTO_ARCHIVE", null) != null) {
                archivedCount++;
            }
        }
        return archivedCount;
    }

    private void assertReviewer(LoginUser currentUser) {
        if (currentUser.position() != UserPosition.REVIEWER && currentUser.position() != UserPosition.ADMIN) {
            throw new BusinessException(ResultCode.FORBIDDEN, "当前用户没有审核权限");
        }
    }

    private String resolveStorageMode(AnnotationResult result) {
        if (QaContentStorageMode.isValid(result.getQaContentStorageMode())) {
            return result.getQaContentStorageMode();
        }
        return QaContentStorageMode.INLINE.name();
    }

    private MergeReviewResultResponse archiveRuntimeResult(AnnotationResult result,
                                                           Long reviewerId,
                                                           String archiveReason,
                                                           String reviewComment) {
        LocalDateTime archivedAt = LocalDateTime.now();
        AnnotationResultHistory history = AnnotationResultHistory.builder()
            .id(IdGenerator.nextId())
            .companyId(result.getCompanyId())
            .creatorId(result.getCreatorId())
            .creatorRole(result.getCreatorRole())
            .sourceResultId(result.getId())
            .taskId(result.getTaskId())
            .resourceId(result.getResourceId())
            .qaContentJson(result.getQaContentJson())
            .qaContentStorageMode(resolveStorageMode(result))
            .qaContentFilePath(result.getQaContentFilePath())
            .archiveReason(archiveReason)
            .archivedBy(reviewerId)
            .archivedAt(archivedAt)
            .build();
        annotationResultHistoryMapper.insert(history);

        int updated = annotationResultMapper.markArchived(
            result.getId(),
            result.getCompanyId(),
            reviewerId,
            reviewComment,
            archivedAt);
        if (updated == 0) {
            return null;
        }
        return new MergeReviewResultResponse(result.getId(), history.getId(), archiveReason, archivedAt);
    }
}