"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 { ExportLanguageDialog } from "@/components/public/export-language-dialog";
import {
  ExportLanguageToggle,
  useExportLanguage,
  type ExportLanguage,
} from "@/components/public/export-language";
import { Spinner } from "@/components/ui/spinner";
import { cn } from "@/lib/utils";

const EXPORT_WIDTH = 1200;

function withoutNotesFileName(fileName: string): string {
  return /\.[^.]+$/u.test(fileName)
    ? fileName.replace(/(\.[^.]+)$/u, "-without-notes$1")
    : `${fileName}-without-notes`;
}

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

export function imageExportFileName(
  fileName: string,
  language: ExportLanguage,
  withoutNotes: boolean,
  localized = true,
): string {
  const selectedFileName = withoutNotes ? withoutNotesFileName(fileName) : fileName;
  const languageFileName = localized
    ? (/\.[^.]+$/u.test(selectedFileName)
        ? selectedFileName.replace(/(\.[^.]+)$/u, `-${language}$1`)
        : `${selectedFileName}-${language}`)
    : selectedFileName;
  return downloadFileName(languageFileName);
}

export function GuideImageExport({
  children,
  fileName,
  width = EXPORT_WIDTH,
  height,
  format = "png",
  disabled = false,
  allowWithoutNotes = true,
  captureClassName,
  buttonLabel = "ส่งออกภาพ",
  language: controlledLanguage,
  showLanguageSelector = true,
  promptForLanguage = false,
  localizeFileName = true,
}: {
  children: ReactNode;
  fileName: string;
  width?: number;
  height?: number;
  format?: "png" | "webp";
  disabled?: boolean;
  allowWithoutNotes?: boolean;
  captureClassName?: string;
  buttonLabel?: string;
  language?: ExportLanguage;
  showLanguageSelector?: boolean;
  promptForLanguage?: boolean;
  localizeFileName?: boolean;
}) {
  const captureRef = useRef<HTMLDivElement>(null);
  const [captureMode, setCaptureMode] = useState<
    "with-notes" | "without-notes" | null
  >(null);
  const capturing = captureMode !== null;
  const [storedLanguage, setStoredLanguage] = useExportLanguage();
  const language = controlledLanguage ?? storedLanguage;
  const [pendingCaptureMode, setPendingCaptureMode] = useState<
    "with-notes" | "without-notes" | null
  >(null);

  function selectLanguage(nextLanguage: ExportLanguage) {
    if (!pendingCaptureMode) return;
    setStoredLanguage(nextLanguage);
    setCaptureMode(pendingCaptureMode);
    setPendingCaptureMode(null);
  }

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

    let cancelled = false;

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

        if (captureMode === "without-notes") {
          node.querySelectorAll<HTMLElement>("[data-export-note]").forEach((note) => {
            note.style.display = "none";
          });
          // A note can be the only remaining content in the artifact right column.
          const right = node.querySelector<HTMLElement>(".artifact-export-right");
          if (right) {
            const sections = right.querySelectorAll<HTMLElement>(
              "[data-artifact-export-section]",
            );
            const hasVisibleSection = Array.from(sections).some(
              (section) => getComputedStyle(section).display !== "none",
            );
            if (!hasVisibleSection) right.style.display = "none";
          }
        }

        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 = imageExportFileName(
          fileName,
          language,
          captureMode === "without-notes",
          localizeFileName,
        );
        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) setCaptureMode(null);
      }
    }

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

  return (
    <>
      {showLanguageSelector ? (
        <ExportLanguageToggle language={language} onChange={setStoredLanguage} />
      ) : null}
      <div className="flex flex-wrap gap-2">
        {(["with-notes", "without-notes"] as const).filter((mode) => allowWithoutNotes || mode === "with-notes").map((mode) => (
          <Button
            key={mode}
            type="button"
            variant="outline"
            size="sm"
            disabled={capturing || disabled}
            onClick={() => {
              if (promptForLanguage) setPendingCaptureMode(mode);
              else setCaptureMode(mode);
            }}
          >
            {captureMode === mode ? (
              <Spinner data-icon="inline-start" />
            ) : (
              <DownloadIcon data-icon="inline-start" />
            )}
            {captureMode === mode
              ? "กำลังส่งออก…"
              : mode === "without-notes"
                ? "ส่งออกภาพโดยไม่รวมโน้ต"
                : buttonLabel}
          </Button>
        ))}
      </div>
      <ExportLanguageDialog
        open={pendingCaptureMode !== null}
        onOpenChange={(open) => {
          if (!open) setPendingCaptureMode(null);
        }}
        onSelect={selectLanguage}
      />
      {capturing
        ? createPortal(
            <div
              aria-hidden="true"
              className="pointer-events-none fixed top-0 -left-[10000px]"
            >
              <div
                ref={captureRef}
                data-export-language={language}
                className={cn(
                  "bg-background p-10 text-foreground",
                  captureClassName,
                )}
                style={{ width, height }}
              >
                <style>{'[data-export-language="th"] [data-export-lang="en"],[data-export-language="en"] [data-export-lang="th"]{display:none!important}'}</style>
                {children}
              </div>
            </div>,
            document.body,
          )
        : null}
    </>
  );
}