package com.baiyue.warehouse.service;

import com.baiyue.common.core.api.ResultCode;
import com.baiyue.common.core.exception.BizException;
import com.baiyue.warehouse.client.PrintPdfClient;
import feign.FeignException;
import jakarta.annotation.Resource;
import java.math.BigDecimal;
import java.nio.charset.StandardCharsets;
import java.util.List;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.client.circuitbreaker.NoFallbackAvailableException;
import org.springframework.http.ContentDisposition;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Service;

@Service
public class PalletLabelPrintService {
    @Resource private WarehouseResourceService resources;
    @Resource private DomesticWarehouseDirectory warehouses;
    @Resource private PrintPdfClient print;
    @Value("${baiyue.security.internal-service-token:${baiyue.internal-service.token}}")
    private String internalToken;

    public ResponseEntity<byte[]> print(long warehouseId, long palletId, String requestId) {
        return print(warehouseId, palletId, requestId, "PALLET");
    }

    public ResponseEntity<byte[]> printTransfer(long warehouseId, long palletId, String transferNo,
                                                 String requestId) {
        String reference = transferNo == null || transferNo.isBlank() ? "转运单" : "转运单 " + transferNo.trim();
        return print(warehouseId, palletId, requestId, reference);
    }

    private ResponseEntity<byte[]> print(long warehouseId, long palletId, String requestId, String reference) {
        var pallet = resources.pallet(WarehouseResourceService.PUBLIC_RESOURCE_SCOPE, warehouseId, palletId);
        String code = pallet.getPalletCode();
        String fbaCode = pallet.getFbaWarehouseCode();
        boolean fba = fbaCode != null && !fbaCode.isBlank();
        int maxCodeLength = fba ? 80 : 34;
        // Preserve the authoritative pallet identity on both the barcode and visible text.
        if (code == null || !code.matches("[\\x20-\\x7E]{1," + maxCodeLength + "}") || code.isBlank()
                || !code.equals(code.strip())) {
            throw new BizException(ResultCode.VALIDATION_FAILED, "当前标签模板要求托盘编码为 1–" + maxCodeLength + " 位可打印 ASCII 字符，且无首尾空格，请核对托盘编码");
        }
        var warehouse = warehouses.required(warehouseId);
        String fileName = code.replaceAll("[\\\\/:*?\"<>|]", "-") + "-托盘码.pdf";
        var label = new PrintPdfClient.Label(code,
            fbaCode == null || fbaCode.isBlank() ? "目的仓待定" : fbaCode,
            reference, warehouse.warehouseName(), code);
        var request = new PrintPdfClient.Request("INBOUND_MARK_V1",
            new PrintPdfClient.PageSpec(new BigDecimal("100"), new BigDecimal("100")), fileName, List.of(label));
        try {
            var response = fba
                ? print.generateFbaPalletLabels(internalToken, requestId, new PrintPdfClient.FbaPalletRequest(
                    "FBA_PALLET_A4_LANDSCAPE_V1", new PrintPdfClient.PageSpec(new BigDecimal("297"), new BigDecimal("210")),
                    fileName, List.of(new PrintPdfClient.FbaPalletLabel(fbaCode, code))))
                : print.generateInboundMarks(internalToken, requestId, request);
            byte[] body = response == null ? null : response.getBody();
            MediaType type = response == null ? null : response.getHeaders().getContentType();
            if (response == null || !response.getStatusCode().is2xxSuccessful() || body == null || body.length == 0
                || type == null || !MediaType.APPLICATION_PDF.isCompatibleWith(type)) {
                throw new BizException(ResultCode.SERVICE_UNAVAILABLE, "打印服务未返回有效 PDF，请稍后重试");
            }
            return ResponseEntity.ok().contentType(MediaType.APPLICATION_PDF).contentLength(body.length)
                .header(HttpHeaders.CONTENT_DISPOSITION,
                    ContentDisposition.attachment().filename(fileName, StandardCharsets.UTF_8).build().toString())
                .header(HttpHeaders.CACHE_CONTROL, "no-store").body(body);
        } catch (FeignException | NoFallbackAvailableException exception) {
            throw new BizException(ResultCode.SERVICE_UNAVAILABLE, "打印服务暂不可用，请稍后重试");
        }
    }
}