"use client";

import { useRef, useState } from "react";
import Link from "next/link";
import { QRCodeCanvas } from "qrcode.react";
import { toPng } from "html-to-image";
import { jsPDF } from "jspdf";
import { QR_STAND_PRESETS, type QrStandPreset } from "@menulio/shared";

interface QrStandGeneratorClientProps {
  restaurantName?: string;
  logoUrl?: string | null;
  slug?: string;
  categoriesList?: string[];
}

export function QrStandGeneratorClient({
  restaurantName = "THE URBAN BURGER",
  logoUrl = null,
  slug = "kebapci-sinan-3",
  categoriesList = [],
}: QrStandGeneratorClientProps) {
  const [selectedKey, setSelectedKey] = useState<string>("qr-4");
  const [downloadingPng, setDownloadingPng] = useState(false);
  const [downloadingPdf, setDownloadingPdf] = useState(false);
  const standRef = useRef<HTMLDivElement>(null);

  const activePreset: QrStandPreset = (QR_STAND_PRESETS[selectedKey] || Object.values(QR_STAND_PRESETS)[0])!;
  const targetUrl = `https://menul.io/${slug}`;

  const displayCategories =
    categoriesList.length > 0 ? categoriesList.slice(0, 4) : activePreset.categories;

  async function handleDownloadPng() {
    if (!standRef.current) return;
    setDownloadingPng(true);
    try {
      const dataUrl = await toPng(standRef.current, {
        cacheBust: true,
        pixelRatio: 3, // 300 DPI high resolution
      });
      const link = document.createElement("a");
      link.download = `${slug}-masa-stant-qr.png`;
      link.href = dataUrl;
      link.click();
    } catch (err) {
      console.error("PNG indirme hatası:", err);
      alert("PNG indirilemedi. Lütfen tekrar deneyin.");
    } finally {
      setDownloadingPng(false);
    }
  }

  async function handleDownloadPdf() {
    if (!standRef.current) return;
    setDownloadingPdf(true);
    try {
      const dataUrl = await toPng(standRef.current, {
        cacheBust: true,
        pixelRatio: 3,
      });

      // A5 dimensions in mm: 148 x 210
      const pdf = new jsPDF({
        orientation: "portrait",
        unit: "mm",
        format: "a5",
      });

      const pdfWidth = pdf.internal.pageSize.getWidth();
      const pdfHeight = pdf.internal.pageSize.getHeight();

      pdf.addImage(dataUrl, "PNG", 0, 0, pdfWidth, pdfHeight);
      pdf.save(`${slug}-masa-stant-a5.pdf`);
    } catch (err) {
      console.error("PDF indirme hatası:", err);
      alert("PDF indirilemedi. Lütfen tekrar deneyin.");
    } finally {
      setDownloadingPdf(false);
    }
  }

  return (
    <div className="min-h-screen bg-stone-950 text-stone-100 flex flex-col font-sans select-none">
      {/* Top Navbar */}
      <header className="border-b border-stone-800/80 bg-stone-900/90 backdrop-blur-xl sticky top-0 z-50 px-4 sm:px-6 py-3.5">
        <div className="max-w-7xl mx-auto flex items-center justify-between">
          <div className="flex items-center gap-3">
            <Link href="/" className="font-black text-xl tracking-tight text-amber-400">
              MENULIO
            </Link>
            <span className="text-stone-600 hidden sm:inline">/</span>
            <span className="text-xs font-semibold text-stone-400 hidden sm:inline">
              Masa Stant QR Jeneratörü
            </span>
          </div>

          <Link
            href="/"
            className="text-xs font-bold px-4 py-2 rounded-xl bg-amber-500 hover:bg-amber-400 text-stone-950 transition-all shadow-md shadow-amber-500/20"
          >
            Ana Sayfa →
          </Link>
        </div>
      </header>

      {/* Main Content Area */}
      <main className="flex-1 max-w-6xl w-full mx-auto p-4 sm:p-8 flex flex-col lg:flex-row gap-8 items-center lg:items-start justify-center">
        {/* Left Panel: Preset Selectors & Download Controls */}
        <div className="w-full lg:w-96 flex flex-col gap-6">
          {Object.values(QR_STAND_PRESETS).length > 1 && (
            <div className="bg-stone-900/80 border border-stone-800 p-6 rounded-3xl space-y-4 shadow-xl">
              <div>
                <span className="text-xs font-bold uppercase tracking-wider text-amber-400">
                  1. Stant Teması Seçin
                </span>
                <h1 className="text-xl sm:text-2xl font-extrabold text-white mt-1">
                  Masa Kartı Şablonları
                </h1>
                <p className="text-xs text-stone-400 mt-1 leading-relaxed">
                  Restoranınızın konseptine uygun masa stant tasarımını seçin.
                </p>
              </div>

              {/* Presets List */}
              <div className="space-y-2.5 pt-2">
                {Object.values(QR_STAND_PRESETS).map((preset) => {
                  const isSelected = preset.key === selectedKey;
                  return (
                    <button
                      key={preset.key}
                      onClick={() => setSelectedKey(preset.key)}
                      className={`w-full p-3.5 rounded-2xl border text-left transition-all flex items-center justify-between ${
                        isSelected
                          ? "bg-amber-500/10 border-amber-500 text-amber-400 shadow-md shadow-amber-500/5"
                          : "bg-stone-950/60 border-stone-800 text-stone-300 hover:border-stone-700"
                      }`}
                    >
                      <div className="flex items-center gap-3">
                        <div
                          className="w-4 h-4 rounded-full border border-white/20 shadow-sm"
                          style={{ background: preset.plaqueBg }}
                        />
                        <div>
                          <div className="text-xs font-bold">{preset.name}</div>
                          <div className="text-[10px] text-stone-400">{preset.categoryName}</div>
                        </div>
                      </div>
                      {isSelected && <span className="text-xs font-bold">✓</span>}
                    </button>
                  );
                })}
              </div>
            </div>
          )}

          {/* Action Download Buttons */}
          <div className="bg-stone-900/80 border border-stone-800 p-6 rounded-3xl space-y-3.5 shadow-xl">
            <span className="text-xs font-bold uppercase tracking-wider text-stone-400">
              2. Baskı Çıktısı Alın
            </span>

            {/* PNG Download Button */}
            <button
              onClick={handleDownloadPng}
              disabled={downloadingPng}
              className="w-full py-3.5 px-4 rounded-2xl bg-amber-500 hover:bg-amber-400 text-stone-950 font-extrabold text-sm transition-all shadow-lg shadow-amber-500/20 flex items-center justify-center gap-2"
            >
              {downloadingPng ? (
                <span>Hazırlanıyor...</span>
              ) : (
                <>
                  <svg className="w-5 h-5 fill-current" viewBox="0 0 24 24">
                    <path d="M19 9h-4V3H9v6H5l7 7 7-7zM5 18v2h14v-2H5z" />
                  </svg>
                  <span>PNG Olarak İndir (300 DPI Ultra HD)</span>
                </>
              )}
            </button>

            {/* PDF Download Button */}
            <button
              onClick={handleDownloadPdf}
              disabled={downloadingPdf}
              className="w-full py-3.5 px-4 rounded-2xl bg-stone-800 hover:bg-stone-700 text-white font-extrabold text-sm border border-stone-700 transition-all flex items-center justify-center gap-2"
            >
              {downloadingPdf ? (
                <span>Hazırlanıyor...</span>
              ) : (
                <>
                  <svg className="w-5 h-5 fill-current" viewBox="0 0 24 24">
                    <path d="M20 2H8c-1.1 0-2 .9-2 2v12c0 1.1.9 2 2 2h12c1.1 0 2-.9 2-2V4c0-1.1-.9-2-2-2zm0 14H8V4h12v12zM4 6H2v14c0 1.1.9 2 2 2h14v-2H4V6z" />
                  </svg>
                  <span>PDF Olarak İndir (A5 Matbaa Baskı)</span>
                </>
              )}
            </button>
          </div>
        </div>

        {/* Right Panel: Stand Live Visual Canvas Preview */}
        <div className="flex-1 flex flex-col items-center justify-center w-full">
          <div
            className="p-6 sm:p-10 rounded-[3rem] shadow-2xl flex items-center justify-center border border-white/5"
            style={{ background: activePreset.bgGradient }}
          >
            {/* Tabletop Plaque Container */}
            {activePreset.svgTemplateUrl ? (
              <div
                ref={standRef}
                className={`w-[360px] sm:w-[380px] rounded-[2.5rem] relative overflow-hidden shadow-[0_25px_60px_rgba(0,0,0,0.6)] border-2 border-white/10 ${
                  activePreset.aspectRatio === "672/900" ? "aspect-[672/900]" : "aspect-[400/650]"
                }`}
              >
                {/* Exact SVG Template Vector Background Graphic */}
                <img
                  src={activePreset.svgTemplateUrl}
                  alt={activePreset.name}
                  className="absolute inset-0 w-full h-full object-cover pointer-events-none"
                />

                {/* Dynamic Restaurant Logo & Name Header Overlay */}
                <div
                  className={`absolute left-0 right-0 flex flex-col items-center justify-center px-6 text-center z-10 ${
                    activePreset.key === "qr-1" ? "top-[13%]" : "top-[15.5%]"
                  }`}
                >
                  {logoUrl ? (
                    <img
                      src={logoUrl}
                      alt={restaurantName}
                      className="h-8 w-auto max-w-[120px] object-contain mb-1"
                    />
                  ) : null}
                  <span
                    className="font-black text-xl sm:text-2xl tracking-wider uppercase font-['Montserrat'] leading-tight drop-shadow-md"
                    style={{ color: activePreset.accentText }}
                  >
                    {restaurantName}
                  </span>
                </div>

                {/* Dynamic QR Code Canvas Overlay */}
                <div
                  className={`absolute left-1/2 -translate-x-1/2 rounded-[20px] p-3 shadow-2xl flex items-center justify-center bg-white z-10 border border-zinc-200 ${
                    activePreset.key === "qr-1"
                      ? "top-[37%] w-[52%] aspect-square"
                      : "top-[33.1%] w-[55%] aspect-square"
                  }`}
                >
                  <QRCodeCanvas
                    value={targetUrl}
                    size={200}
                    bgColor={activePreset.qrBg || "#ffffff"}
                    fgColor={activePreset.qrColor || "#111111"}
                    level="H"
                    style={{ width: "100%", height: "100%" }}
                    includeMargin={false}
                  />
                </div>
              </div>
            ) : (
              <div
                ref={standRef}
                className="w-[360px] sm:w-[380px] min-h-[660px] rounded-[2.5rem] p-7 flex flex-col items-center text-center relative shadow-[0_25px_60px_rgba(0,0,0,0.6)] border-2"
                style={{
                  background: activePreset.plaqueBg,
                  borderColor: activePreset.borderAccent,
                }}
              >
                {/* Inner Line Accent */}
                <div
                  className="absolute inset-2.5 rounded-[2rem] border pointer-events-none"
                  style={{ borderColor: activePreset.borderAccent }}
                />

                {/* 01. Brand Badge */}
                <header className="flex flex-col items-center text-center mt-2 z-10">
                  <div
                    className="border-2 rounded-xl px-4 py-2 flex flex-col items-center mb-4 shadow-md"
                    style={{
                      borderColor: activePreset.logoBorder,
                      backgroundColor: activePreset.logoBg,
                    }}
                  >
                    {logoUrl ? (
                      <img
                        src={logoUrl}
                        alt={restaurantName}
                        className="h-10 w-auto max-w-[140px] object-contain mb-1"
                      />
                    ) : null}
                    <span
                      className="font-black text-xl tracking-wider uppercase font-['Montserrat'] leading-tight"
                      style={{ color: activePreset.accentText }}
                    >
                      {restaurantName}
                    </span>
                  </div>

                  {/* Scan Action Text */}
                  <h2
                    className="font-['Montserrat'] font-black text-2xl sm:text-3xl tracking-tight uppercase leading-[0.95] drop-shadow-sm"
                    style={{ color: activePreset.headerText }}
                  >
                    DİJİTAL MENÜ<br />
                    <span className="tracking-wide">KAMERANIZLA TARATIN</span>
                  </h2>
                </header>

                {/* 02. Centered Custom QR Code Box */}
                <section
                  className="w-60 h-60 sm:w-64 sm:h-64 rounded-3xl p-5 shadow-2xl flex items-center justify-center my-6 relative border border-black/15 z-10"
                  style={{ backgroundColor: activePreset.qrBg }}
                >
                  <QRCodeCanvas
                    value={targetUrl}
                    size={200}
                    bgColor={activePreset.qrBg}
                    fgColor={activePreset.qrColor}
                    level="H"
                    includeMargin={false}
                  />
                </section>

                {/* 03. Category Highlights Footer */}
                <footer className="w-full relative px-4 text-center z-10 pb-2 flex-1 flex flex-col justify-end">
                  <p
                    className="text-xs tracking-wide mb-3 font-semibold"
                    style={{ color: activePreset.subText }}
                  >
                    Telefonunuzun kamerasını doğrultun
                  </p>

                  {/* Category Text Stack */}
                  <div
                    className="flex flex-col gap-1.5 max-w-[210px] mx-auto font-['Montserrat'] font-extrabold uppercase tracking-widest text-sm sm:text-base"
                    style={{ color: activePreset.headerText }}
                  >
                    {displayCategories.map((cat, idx) => (
                      <div key={idx} className="w-full">
                        <div className="py-0.5">{cat}</div>
                        {idx < displayCategories.length - 1 && (
                          <div
                            className="w-full h-[1px] my-0.5"
                            style={{ backgroundColor: activePreset.dividerColor }}
                          />
                        )}
                      </div>
                    ))}
                  </div>
                </footer>
              </div>
            )}
          </div>
        </div>
      </main>
    </div>
  );
}