"use client";

import { useState } from "react";
import {
  Dialog,
  DialogContent,
  DialogHeader,
  DialogTitle,
  DialogFooter,
} from "@/components/ui/dialog";
import { Button } from "@/components/ui/button";
import { Download, Printer, Loader2, AlertCircle } from "lucide-react";
import { BarcodeLabelLayout } from "@/types/barcode";
import { generateZPL } from "@/lib/zplGenerator";
import {
  printZPLToZebraBLE,
  isWebBluetoothSupported,
  getUnsupportedMessage,
} from "@/lib/zebraBluetooth";
import {
  printZPLToBrowserPrint,
  getBrowserPrintHelpMessage,
} from "@/lib/zebraBrowserPrint";
import { useToast } from "@/hooks/use-toast";
import { BarcodeLabelCanvasComponent } from "./BarcodeLabelCanvasComponent";
import { MM_TO_PX } from "@/contexts/BarcodeDesignerContext";

const PREVIEW_MAX_PX = 320;

interface BarcodePrintPreviewModalProps {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  layout: BarcodeLabelLayout;
  labelName?: string;
}

export function BarcodePrintPreviewModal({
  open,
  onOpenChange,
  layout,
  labelName = "라벨",
}: BarcodePrintPreviewModalProps) {
  const { toast } = useToast();
  const [printing, setPrinting] = useState(false);

  const { width_mm, height_mm, components } = layout;
  const widthPx = width_mm * MM_TO_PX;
  const heightPx = height_mm * MM_TO_PX;
  const scale =
    widthPx > PREVIEW_MAX_PX || heightPx > PREVIEW_MAX_PX
      ? Math.min(PREVIEW_MAX_PX / widthPx, PREVIEW_MAX_PX / heightPx)
      : 1;
  const previewW = Math.round(widthPx * scale);
  const previewH = Math.round(heightPx * scale);

  const zpl = generateZPL(layout);
  const bleSupported = isWebBluetoothSupported();
  const unsupportedMsg = getUnsupportedMessage();

  const handleDownloadZPL = () => {
    const blob = new Blob([zpl], { type: "text/plain;charset=utf-8" });
    const url = URL.createObjectURL(blob);
    const a = document.createElement("a");
    a.href = url;
    a.download = `${labelName}.zpl`;
    a.click();
    URL.revokeObjectURL(url);
    toast({ title: "다운로드", description: "ZPL 파일이 저장되었습니다." });
  };

  const handlePrintToZebra = async () => {
    const canUseBle = bleSupported;
    if (!canUseBle) {
      // Browser Print만 시도 (스크립트 로드 후 기본 프린터로 전송)
      setPrinting(true);
      try {
        const result = await printZPLToBrowserPrint(zpl);
        if (result.success) {
          toast({ title: "전송 완료", description: result.message });
          onOpenChange(false);
        } else {
          toast({
            title: "출력 실패",
            description: result.message,
            variant: "destructive",
          });
          toast({
            title: "안내",
            description: getBrowserPrintHelpMessage(),
            variant: "default",
          });
        }
      } catch (e: unknown) {
        toast({
          title: "오류",
          description: (e as Error).message || "Zebra 출력 중 오류가 발생했습니다.",
          variant: "destructive",
        });
      } finally {
        setPrinting(false);
      }
      return;
    }

    // Web Bluetooth 지원 시: Browser Print 먼저 시도, 실패하면 BLE로 폴백
    setPrinting(true);
    try {
      const bpResult = await printZPLToBrowserPrint(zpl);
      if (bpResult.success) {
        toast({ title: "전송 완료", description: bpResult.message });
        onOpenChange(false);
        return;
      }
      const bleResult = await printZPLToZebraBLE(zpl);
      if (bleResult.success) {
        toast({ title: "전송 완료", description: bleResult.message });
        onOpenChange(false);
      } else {
        toast({
          title: "출력 실패",
          description: bleResult.message,
          variant: "destructive",
        });
        toast({
          title: "안내",
          description: getBrowserPrintHelpMessage(),
          variant: "default",
        });
      }
    } catch (e: unknown) {
      toast({
        title: "오류",
        description: (e as Error).message || "Zebra 출력 중 오류가 발생했습니다.",
        variant: "destructive",
      });
    } finally {
      setPrinting(false);
    }
  };

  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <DialogContent className="max-w-lg">
        <DialogHeader>
          <DialogTitle>인쇄 미리보기</DialogTitle>
        </DialogHeader>

        <div className="space-y-4">
          <p className="text-muted-foreground text-sm">
            {width_mm}×{height_mm}mm · {components.length}개 요소
          </p>

          {/* 미리보기 캔버스 (축소) */}
          <div className="flex justify-center rounded border bg-gray-100 p-4">
            <div
              className="relative bg-white shadow"
              style={{
                width: previewW,
                height: previewH,
                transformOrigin: "top left",
              }}
            >
              <div
                className="pointer-events-none"
                style={{
                  transform: `scale(${scale})`,
                  transformOrigin: "0 0",
                  width: widthPx,
                  height: heightPx,
                  position: "absolute",
                  left: 0,
                  top: 0,
                }}
              >
                {components.map((c) => (
                  <BarcodeLabelCanvasComponent key={c.id} component={c} />
                ))}
              </div>
            </div>
          </div>

          {!bleSupported && (
            <div className="flex gap-2 rounded-md border border-amber-200 bg-amber-50 p-3 text-sm text-amber-800">
              <AlertCircle className="h-4 w-4 shrink-0" />
              <span>
                Web Bluetooth 미지원 브라우저입니다. Zebra Browser Print 앱을 설치하면 출력할 수 있습니다.
                {unsupportedMsg && ` ${unsupportedMsg}`}
              </span>
            </div>
          )}

          <p className="text-muted-foreground text-xs">
            {bleSupported ? (
              <>
                Zebra 프린터를 Bluetooth LE로 켜 두고, 출력 시 기기 선택에서 프린터를 선택하세요.
                (Chrome/Edge 권장)
                {typeof navigator !== "undefined" && /Android/i.test(navigator.userAgent) && (
                  <> Android에서는 목록에 인근 BLE 기기가 모두 표시되므로, &apos;ZD421&apos; 등 프린터 이름을 골라 주세요.</>
                )}
              </>
            ) : null}
            {typeof navigator !== "undefined" && /Android/i.test(navigator.userAgent) && (
              <>
                {" "}
                목록에 프린터가 안 나오면 지브라 공식 &apos;Zebra Browser Print&apos; 앱을 설치한 뒤, 앱에서 프린터 검색·기본 설정 후 이 사이트를 허용하면 출력할 수 있습니다.
              </>
            )}
          </p>
        </div>

        <DialogFooter className="gap-2 sm:gap-0">
          <Button variant="outline" size="sm" onClick={handleDownloadZPL} className="gap-1">
            <Download className="h-4 w-4" />
            ZPL 다운로드
          </Button>
          <Button
            size="sm"
            className="gap-1"
            onClick={handlePrintToZebra}
            disabled={printing}
          >
            {printing ? (
              <Loader2 className="h-4 w-4 animate-spin" />
            ) : (
              <Printer className="h-4 w-4" />
            )}
            Zebra 프린터로 출력
          </Button>
        </DialogFooter>
      </DialogContent>
    </Dialog>
  );
}