package jnpf.bizcommon.onlyoffice.service.impl;

import jnpf.dmsEntity.preview.model.DmsFilePreviewTicket;
import jnpf.exception.DataException;
import jnpf.onlyoffice.DmsPreviewPdfRequest;
import jnpf.util.TicketUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.function.Function;

@Service
public class DmsOnlyOfficePreviewService {
    private final OnlyOfficeDmsPrintRenderer renderer;
    private final DmsOnlyOfficePrintPdfComposer composer;
    private final Function<String, Object> ticketReader;

    @Autowired
    public DmsOnlyOfficePreviewService(OnlyOfficeDmsPrintRenderer renderer,
                                       DmsOnlyOfficePrintPdfComposer composer) {
        this(renderer, composer, TicketUtil::parseTicket);
    }

    DmsOnlyOfficePreviewService(OnlyOfficeDmsPrintRenderer renderer,
                                DmsOnlyOfficePrintPdfComposer composer,
                                Function<String, Object> ticketReader) {
        this.renderer = renderer;
        this.composer = composer;
        this.ticketReader = ticketReader;
    }

    public byte[] render(DmsPreviewPdfRequest request) {
        if (request == null || request.getFileVersionId() == null
                || request.getAccessTicket() == null || request.getAccessTicket().isBlank()) {
            throw new DataException("缺少 DMS 预览 PDF 转换参数");
        }
        DmsFilePreviewTicket ticket;
        try {
            ticket = DmsFilePreviewTicket.fromRaw(ticketReader.apply(request.getAccessTicket()));
        } catch (RuntimeException exception) {
            throw new DataException("DMS 预览票据无效或已过期");
        }
        if (!DmsFilePreviewTicket.SCOPE.equals(ticket.getScope())
                || !request.getFileVersionId().equals(ticket.getFileVersionId())) {
            throw new DataException("DMS 预览票据与文件版本不匹配");
        }
        byte[] basePdf = renderer.renderBase(ticket, request.getAccessTicket());
        return composer.composePreview(basePdf, ticket);
    }
}