"use client";

import React, { useEffect, useState } from "react";
import { AlertCircle, CheckCircle2, Clock, Loader2, Lock, ShieldCheck, X } from "lucide-react";
import { formatPrice } from "@/lib/format";

type Props = {
  isOpen: boolean;
  onClose: () => void;
  onSuccess: () => void;
  amount: number;
  phone: string;
  cardNumber: string;
  cardHolder: string;
};

export function ThreeDSecureModal({
  isOpen,
  onClose,
  onSuccess,
  amount,
  phone,
  cardNumber,
  cardHolder,
}: Props) {
  const [code, setCode] = useState("");
  const [seconds, setSeconds] = useState(180);
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);

  useEffect(() => {
    if (!isOpen) return;
    setCode("");
    setError(null);
    setSeconds(180);

    const timer = setInterval(() => {
      setSeconds((prev) => (prev > 0 ? prev - 1 : 0));
    }, 1000);

    return () => clearInterval(timer);
  }, [isOpen]);

  if (!isOpen) return null;

  const minutes = Math.floor(seconds / 60);
  const remainingSeconds = seconds % 60;
  const timeFormatted = `${String(minutes).padStart(2, "0")}:${String(remainingSeconds).padStart(2, "0")}`;

  const maskedCard =
    cardNumber.length >= 4
      ? `**** **** **** ${cardNumber.replace(/\s+/g, "").slice(-4)}`
      : "**** **** **** ****";

  const maskedPhone =
    phone.length >= 4
      ? `${phone.slice(0, 3)}*** ** ${phone.slice(-2)}`
      : "05** *** ** **";

  async function handleVerify(e: React.FormEvent) {
    e.preventDefault();
    setError(null);

    const cleanCode = code.trim();
    if (cleanCode.length < 4) {
      setError("Lütfen geçerli bir SMS doğrulama kodu girin.");
      return;
    }

    setLoading(true);
    // Gerçekçi banka doğrulama gecikmesi (1.2 saniye)
    await new Promise((r) => setTimeout(r, 1200));

    setLoading(false);
    onSuccess();
  }

  return (
    <div className="fixed inset-0 z-50 flex items-center justify-center p-4">
      {/* Backdrop */}
      <div
        className="fixed inset-0 bg-slate-950/70 backdrop-blur-sm transition-opacity"
        onClick={onClose}
      />

      {/* Modal Kutusu */}
      <div className="relative w-full max-w-md overflow-hidden rounded-3xl bg-white shadow-2xl ring-1 ring-slate-900/10">
        {/* Banka / 3D Başlığı */}
        <div className="flex items-center justify-between border-b border-slate-100 bg-slate-50 px-6 py-4">
          <div className="flex items-center gap-2.5">
            <span className="grid size-8 place-items-center rounded-lg bg-emerald-600 text-white">
              <Lock className="size-4" />
            </span>
            <div>
              <h3 className="font-display text-sm font-extrabold text-slate-900">
                Banka 3D Secure Doğrulama
              </h3>
              <p className="text-[11px] font-semibold text-slate-500">
                Güvenli Ortak Ödeme Ekranı
              </p>
            </div>
          </div>
          <button
            type="button"
            onClick={onClose}
            className="rounded-lg p-1 text-slate-400 hover:bg-slate-200 hover:text-slate-600"
          >
            <X className="size-5" />
          </button>
        </div>

        {/* İşlem Detayı */}
        <div className="bg-sand/30 px-6 py-3.5 text-xs font-semibold text-slate-700">
          <div className="flex justify-between py-1">
            <span className="text-slate-500">İşyeri:</span>
            <span className="font-extrabold text-slate-900">PetMarketim A.Ş.</span>
          </div>
          <div className="flex justify-between py-1">
            <span className="text-slate-500">Ödenecek Tutar:</span>
            <span className="font-extrabold text-brand-600">{formatPrice(amount)}</span>
          </div>
          <div className="flex justify-between py-1">
            <span className="text-slate-500">Kart Numarası:</span>
            <span className="font-mono font-bold text-slate-800">{maskedCard}</span>
          </div>
        </div>

        {/* SMS Doğrulama Formu */}
        <form onSubmit={handleVerify} className="p-6">
          <p className="text-xs font-semibold leading-relaxed text-slate-600">
            <strong>{maskedPhone}</strong> nolu cep telefonunuza gönderilen 6 haneli tek kullanımlık SMS onay şifresini giriniz.
          </p>

          <div className="mt-5">
            <div className="flex items-center justify-between">
              <label
                htmlFor="smsCode"
                className="block text-xs font-extrabold uppercase tracking-wider text-slate-500"
              >
                SMS Onay Kodu
              </label>
              <span className="flex items-center gap-1 font-mono text-xs font-bold text-amber-600">
                <Clock className="size-3.5" /> {timeFormatted}
              </span>
            </div>

            <input
              id="smsCode"
              autoFocus
              type="text"
              inputMode="numeric"
              maxLength={6}
              value={code}
              onChange={(e) => setCode(e.target.value.replace(/\D/g, ""))}
              placeholder="123456"
              className="mt-2 w-full rounded-2xl border-2 border-slate-200 bg-slate-50 px-4 py-3 text-center font-mono text-2xl font-black tracking-[0.4em] text-slate-900 outline-none transition-colors placeholder:text-slate-300 focus:border-brand-500 focus:bg-white"
            />
          </div>

          {error && (
            <div className="mt-3 flex items-center gap-2 text-xs font-bold text-red-600">
              <AlertCircle className="size-4 shrink-0" />
              <span>{error}</span>
            </div>
          )}

          <div className="mt-3 rounded-xl bg-amber-50 p-2.5 text-center text-[11px] font-bold text-amber-800 ring-1 ring-amber-200/80">
            💡 <strong>Test Ortamı:</strong> Telefonunuza SMS gelmesini beklemeden <code className="rounded bg-amber-200/60 px-1 py-0.5">123456</code> veya herhangi bir 6 haneli kod yazarak testi tamamlayabilirsiniz.
          </div>

          <div className="mt-6 space-y-2">
            <button
              type="submit"
              disabled={loading || seconds === 0}
              className="flex w-full items-center justify-center gap-2 rounded-2xl bg-emerald-600 py-3.5 text-sm font-extrabold text-white shadow-lg shadow-emerald-600/30 transition-all hover:bg-emerald-700 active:scale-[0.98] disabled:opacity-50"
            >
              {loading ? (
                <>
                  <Loader2 className="size-4.5 animate-spin" />
                  Banka Onayı Alınıyor...
                </>
              ) : (
                <>
                  <CheckCircle2 className="size-4.5" />
                  Onayla ve Ödemeyi Tamamla
                </>
              )}
            </button>

            <button
              type="button"
              onClick={onClose}
              disabled={loading}
              className="w-full py-2.5 text-xs font-extrabold text-slate-500 hover:text-slate-800"
            >
              İşlemi İptal Et
            </button>
          </div>
        </form>
      </div>
    </div>
  );
}