"use client";

import { useEffect, useRef, useState, type ReactNode } from "react";
import { createPortal } from "react-dom";
import { DownloadIcon } from "lucide-react";
import { toast } from "sonner";

import { Button } from "@/components/ui/button";
import { Spinner } from "@/components/ui/spinner";
import { cn } from "@/lib/utils";

const EXPORT_WIDTH = 1200;

function downloadFileName(value: string): string {
  return value.replace(/[\\/:*?"<>|]/gu, "-");
}

export function GuideImageExport({
  children,
  fileName,
  width = EXPORT_WIDTH,
  height,
  format = "png",
  disabled = false,
  captureClassName,
  buttonLabel = "ส่งออกภาพ",
}: {
  children: ReactNode;
  fileName: string;
  width?: number;
  height?: number;
  format?: "png" | "webp";
  disabled?: boolean;
  captureClassName?: string;
  buttonLabel?: string;
}) {
  const captureRef = useRef<HTMLDivElement>(null);
  const [capturing, setCapturing] = useState(false);

  useEffect(() => {
    if (!capturing) return;

    let cancelled = false;

    async function capture() {
      try {
        const node = captureRef.current;
        if (!node) throw new Error("Capture target is unavailable");

        const { domToBlob, waitUntilLoad } = await import("modern-screenshot");
        await Promise.all([document.fonts.ready, waitUntilLoad(node)]);
        const blob = await domToBlob(node, {
          backgroundColor: getComputedStyle(node).backgroundColor,
          type: `image/${format}`,
          scale: 1,
          width,
          height,
        });
        if (cancelled) return;

        const url = URL.createObjectURL(blob);
        const link = document.createElement("a");
        link.download = downloadFileName(fileName);
        link.href = url;
        document.body.append(link);
        link.click();
        link.remove();
        window.setTimeout(() => URL.revokeObjectURL(url), 0);
      } catch {
        if (!cancelled) toast.error("ส่งออกภาพไม่สำเร็จ กรุณาลองอีกครั้ง");
      } finally {
        if (!cancelled) setCapturing(false);
      }
    }

    void capture();
    return () => {
      cancelled = true;
    };
  }, [capturing, fileName, format, height, width]);

  return (
    <>
      <Button
        type="button"
        variant="outline"
        size="sm"
        disabled={capturing || disabled}
        onClick={() => setCapturing(true)}
      >
        {capturing ? (
          <Spinner data-icon="inline-start" />
        ) : (
          <DownloadIcon data-icon="inline-start" />
        )}
        {capturing ? "กำลังส่งออก…" : buttonLabel}
      </Button>
      {capturing
        ? createPortal(
            <div
              aria-hidden="true"
              className="pointer-events-none fixed top-0 -left-[10000px]"
            >
              <div
                ref={captureRef}
                className={cn(
                  "bg-background p-10 text-foreground",
                  captureClassName,
                )}
                style={{ width, height }}
              >
                {children}
              </div>
            </div>,
            document.body,
          )
        : null}
    </>
  );
}