"use client";

import { getAccessToken_client } from "@/utils/apiHelper_client";
import React, { useEffect, useMemo, useState } from "react";

type Store = {
  description?: string;
  lastOpenedTime?: string;
  logo?: { url?: string };
  name?: string;
  url?: string;
  urlPath?: string;
};

type Payload = {
  userid?: string;
  message?: string;
  store?: Store;
  storeId?: string;
};

function tryParseData(raw: string | null): Payload | null {
  if (!raw) return null;
  try {
    return JSON.parse(decodeURIComponent(raw));
  } catch {
    return null;
  }
}

function formatDate(iso?: string) {
  if (!iso) return "—";
  const d = new Date(iso);
  return isNaN(d.getTime()) ? "—" : d.toLocaleString();
}

const read = async (r: Response) =>
  r.headers.get("content-type")?.includes("application/json")
    ? r.json()
    : r.text();

export default function AuthCompleteClient() {
  const [payload, setPayload] = useState<Payload | null>(null);

  useEffect(() => {
    const url = new URL(window.location.href);
    const hash = window.location.hash;
    const hashVal = hash.startsWith("#data=") ? hash.slice(6) : null;
    const hashPayload = tryParseData(hashVal);
    const qpPayload = tryParseData(url.searchParams.get("data"));
    const storeIdOnly = url.searchParams.get("storeId");

    setPayload(
      hashPayload || qpPayload || (storeIdOnly ? { storeId: storeIdOnly } : null)
    );
  }, []);

  const { title, subtitle, logoUrl, desc, link, lastOpen } = useMemo(() => {
    const store = payload?.store ?? {};
    const id = payload?.storeId || store.urlPath || "—";
    return {
      title:
        payload?.message ||
        (store.name
          ? `eBay connected! Tokens saved for Store ${store.urlPath}.`
          : `eBay connected! Store ${id}`),
      subtitle: store.name || id,
      logoUrl: store.logo?.url,
      desc: store.description,
      link: store.url,
      lastOpen: formatDate(store.lastOpenedTime),
    };
  }, [payload]);

  useEffect(() => {
    if (payload) {
      (async () => {
        const accessToken = await getAccessToken_client();
        payload.userid = sessionStorage.getItem("USERID") || undefined;
        if (!payload.userid) return;

        const saveRes = await fetch(
          "https://ebay.backend.data4autos.com/api/motorstate/auth/ebay/store/save",
          {
            method: "POST",
            headers: { "Content-Type": "application/json" },
            body: JSON.stringify(payload),
          }
        );

        const saveData = await read(saveRes);
        if (!saveRes.ok) {
          console.error("Save failed:", saveData);
        }
      })();
    }
  }, [payload]);

  return (
    <div className="min-h-[83vh] flex flex-col items-center justify-center bg-gradient-to-br from-[#00d1ff]/10 via-white to-[#00d1ff]/20 text-gray-800 px-6 py-12">
      {/* 🎉 Confetti Animation */}
      <Confetti />

      {/* Card */}
      <div className="w-full max-w-2xl bg-white shadow-xl border border-[#00d1ff]/30 rounded-3xl p-8 text-center relative">
        <div className="absolute top-0 left-0 w-full h-2 bg-[#00d1ff]" />

        <div className="inline-flex items-center gap-2 bg-[#00d1ff]/10 border border-[#00d1ff]/30 text-[#00d1ff] px-4 py-1 rounded-full mb-6 font-medium">
          ✅ Connected
        </div>

        <h1 className="text-2xl md:text-3xl font-bold text-[#00d1ff] mb-4">
          {title || "eBay connected successfully!"} 🎉
        </h1>

        <div className="flex items-center justify-center gap-4 mb-6">
          {logoUrl ? (
            <img
              src={logoUrl}
              alt={subtitle || "Store Logo"}
              className="w-20 h-20 rounded-xl border border-[#00d1ff]/30 object-cover"
            />
          ) : (
            <div className="w-20 h-20 rounded-xl bg-[#00d1ff]/10 flex items-center justify-center text-2xl font-bold text-[#00d1ff] border border-[#00d1ff]/20">
              {subtitle?.[0] || "S"}
            </div>
          )}
          <div className="text-left">
            <div className="text-lg font-semibold text-gray-700">{subtitle}</div>
            <div className="text-sm text-gray-500">
              Last opened: <strong>{lastOpen}</strong>
            </div>
          </div>
        </div>

        {desc && <p className="text-gray-600 mb-6">{desc}</p>}

        <div className="flex flex-wrap justify-center gap-3">
          {link && (
            <a
              href={link}
              target="_blank"
              rel="noopener noreferrer"
              className="bg-[#00d1ff] hover:bg-[#00b0e6] text-white px-5 py-2 rounded-lg font-medium transition"
            >
              Visit eBay Store
            </a>
          )}
          <a
            href="/"
            className="border border-[#00d1ff] text-[#00d1ff] hover:bg-[#00d1ff]/10 px-5 py-2 rounded-lg font-medium transition"
          >
            Go to Dashboard
          </a>
        </div>

        {!payload && (
          <p className="text-gray-500 text-sm mt-6">
            Waiting for data… redirect with <code>?data=...</code>
          </p>
        )}
      </div>
    </div>
  );
}

/* ===== Tiny Confetti ===== */
const Confetti = () => {
  const pieces = Array.from({ length: 24 });
  return (
    <div className="absolute inset-0 overflow-hidden pointer-events-none">
      <style>{`
      @keyframes drop {
        0% { transform: translateY(-10vh) rotate(0deg); opacity: 0; }
        10% { opacity: 1; }
        100% { transform: translateY(110vh) rotate(720deg); opacity: 0; }
      }
    `}</style>
      {pieces.map((_, i) => {
        const left = Math.random() * 100;
        const size = 6 + Math.random() * 8;
        const duration = 2.8 + Math.random() * 1.6;
        const delay = Math.random() * 0.8;
        const color = ["#00d1ff", "#ff69b4", "#16a34a"][Math.floor(Math.random() * 3)];
        return (
          <span
            key={i}
            className="absolute top-[-10vh] rounded-full"
            style={{
              left: `${left}vw`,
              width: size,
              height: size,
              backgroundColor: color,
              animation: `drop ${duration}s ease-in ${delay}s both`,
            }}
          />
        );
      })}
    </div>
  );
};