package jnpf.dmsService.pdf;

import jnpf.audit.sdk.annotation.AuditLog;
import jnpf.dmsMapper.DmsPdfGenerationTaskMapper;
import jnpf.dmsEntity.storage.form.DmsPersistentPdfInvalidationForm;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.Locale;
import java.util.UUID;

@Service
@RequiredArgsConstructor
@Slf4j
public class DmsPdfGenerationTaskService {
    private final DmsPdfGenerationTaskMapper mapper;

    public void enqueueEligible(String tenantId, UUID fileVersionId, String fileName, String checksumSha256) {
        String extension = extension(fileName);
        if (("doc".equals(extension) || "docx".equals(extension))
                && checksumSha256 != null && checksumSha256.matches("[0-9A-Fa-f]{64}")) {
            mapper.enqueue(tenantId, fileVersionId, checksumSha256.toLowerCase(Locale.ROOT));
        }
    }

    public void enqueueMissingEligible(String tenantId, UUID fileVersionId, String fileName,
                                       String checksumSha256) {
        if (!eligible(fileName, checksumSha256)) return;
        try {
            mapper.requeue(tenantId, fileVersionId, checksumSha256.toLowerCase(Locale.ROOT));
        } catch (RuntimeException exception) {
            log.warn("补投 DMS 持久化 PDF 任务失败，不影响当前文件访问: tenantId={}, fileVersionId={}",
                    tenantId, fileVersionId, exception);
        }
    }

    @Transactional(rollbackFor = Exception.class)
    @AuditLog(action = "DMS_RECOVER_PERSISTENT_PDF",
            label = "恢复持久化 PDF", bizModule = "DMS",
            bizCodeExpr = "#form.fileVersionId", reasonExpr = "#form.reason")
    public void invalidateAndRequeue(DmsPersistentPdfInvalidationForm form) {
        String checksum = form.getSourceChecksumSha256().toLowerCase(Locale.ROOT);
        int cleared = mapper.clearInvalidPdf(form.getTenantId(), form.getFileVersionId(),
                checksum, form.getObjectKey());
        if (cleared > 0) {
            mapper.requeue(form.getTenantId(), form.getFileVersionId(), checksum);
        }
    }

    private boolean eligible(String fileName, String checksumSha256) {
        String extension = extension(fileName);
        return ("doc".equals(extension) || "docx".equals(extension))
                && checksumSha256 != null && checksumSha256.matches("[0-9A-Fa-f]{64}");
    }

    private String extension(String fileName) {
        int dot = fileName == null ? -1 : fileName.lastIndexOf('.');
        return dot < 0 ? "" : fileName.substring(dot + 1).toLowerCase(Locale.ROOT);
    }
}