"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 {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogHeader,
  DialogTitle,
} from "@/components/ui/dialog";
import {
  ExportLanguageToggle,
  useExportLanguage,
  type ExportLanguage,
} from "@/components/public/export-language";
import { Spinner } from "@/components/ui/spinner";
import { ToggleGroup, ToggleGroupItem } from "@/components/ui/toggle-group";
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",
  mobileIconOnly = false,
  language: controlledLanguage,
  showLanguageSelector = true,
  promptForLanguage = false,
  localizeFileName = true,
  modeSelection = "dialog",
}: {
  children: ReactNode;
  fileName: string;
  width?: number;
  height?: number;
  format?: "png" | "webp";
  disabled?: boolean;
  allowWithoutNotes?: boolean;
  captureClassName?: string;
  buttonLabel?: string;
  mobileIconOnly?: boolean;
  language?: ExportLanguage;
  showLanguageSelector?: boolean;
  promptForLanguage?: boolean;
  localizeFileName?: boolean;
  modeSelection?: "dialog" | "inline";
}) {
  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 [selectedMode, setSelectedMode] = useState<"with-notes" | "without-notes">(
    "with-notes",
  );
  const [modeDialogOpen, setModeDialogOpen] = useState(false);

  function requestCapture() {
    setModeDialogOpen(false);
    setCaptureMode(selectedMode);
  }

  function exportButton(label: string) {
    return (
      <Button
        type="button"
        variant="outline"
        size="sm"
        className={mobileIconOnly ? "max-sm:size-7 max-sm:px-0 max-sm:has-data-[icon=inline-start]:pl-0" : undefined}
        disabled={capturing || disabled}
        onClick={() => setModeDialogOpen(true)}
      >
        {capturing ? (
          <Spinner data-icon="inline-start" />
        ) : (
          <DownloadIcon data-icon="inline-start" />
        )}
        <span className={mobileIconOnly ? "sr-only sm:not-sr-only" : undefined}>
          {capturing ? "กำลังส่งออก…" : label}
        </span>
      </Button>
    );
  }

  const exportSettings = (
    <>
      {showLanguageSelector || promptForLanguage ? (
        <div className="flex flex-col gap-2">
          <p className="text-sm font-medium">ภาษาในภาพ</p>
          <ExportLanguageToggle language={language} onChange={setStoredLanguage} />
        </div>
      ) : null}
      {allowWithoutNotes ? (
        <div className="flex flex-col gap-2">
          <p className="text-sm font-medium">โน้ต</p>
          <ToggleGroup
            aria-label="การแสดงโน้ตในภาพส่งออก"
            variant="outline"
            value={[selectedMode]}
            onValueChange={(values) => {
              const next = values[0];
              if (next === "with-notes" || next === "without-notes") setSelectedMode(next);
            }}
          >
            <ToggleGroupItem value="with-notes">รวมโน้ต</ToggleGroupItem>
            <ToggleGroupItem value="without-notes">ไม่รวมโน้ต</ToggleGroupItem>
          </ToggleGroup>
        </div>
      ) : null}
      <Button type="button" disabled={capturing || disabled} onClick={requestCapture}>
        {capturing ? <Spinner data-icon="inline-start" /> : <DownloadIcon data-icon="inline-start" />}
        {capturing ? "กำลังส่งออก…" : buttonLabel}
      </Button>
    </>
  );

  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 (
    <>
      {modeSelection === "inline" ? (
        exportSettings
      ) : (
        <div className="flex flex-wrap gap-2">{exportButton(buttonLabel)}</div>
      )}
      {modeSelection === "dialog" ? (
        <Dialog open={modeDialogOpen} onOpenChange={setModeDialogOpen}>
          <DialogContent>
            <DialogHeader>
              <DialogTitle>ตั้งค่าการส่งออกภาพ</DialogTitle>
              <DialogDescription>เลือกตัวเลือกที่ต้องการก่อนส่งออกภาพ</DialogDescription>
            </DialogHeader>
            {exportSettings}
          </DialogContent>
        </Dialog>
      ) : null}
      {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}
    </>
  );
}