import { QRCodeSVG } from "qrcode.react";
import { LoaderCircle, X } from "lucide-react";
import { useEffect, useState } from "react";
import { useI18n } from "../i18n";
import type { WalletKind } from "./injected";
import { useWallet } from "./WalletProvider";
import { useWalletConnectLogin } from "./useWalletConnectLogin";
import { WalletBrandIcon } from "./WalletBrandIcon";

const wallets: WalletKind[] = ["tokenPocket", "metaMask", "imToken"];

function isMobileDevice(): boolean {
  if (typeof navigator === "undefined") return false;
  return /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini|Mobile/i.test(
    navigator.userAgent || "",
  );
}

export function WalletLoginModal() {
  const { t } = useI18n();
  const { closeLoginModal, loginModalOpen } = useWallet();
  const wc = useWalletConnectLogin();
  const [selected, setSelected] = useState<WalletKind | null>(null);
  const [mobileDevice, setMobileDevice] = useState(false);

  const resetWalletConnect = wc.reset;

  useEffect(() => {
    if (!loginModalOpen) return;
    setMobileDevice(isMobileDevice());
    setSelected(null);
    resetWalletConnect();
  }, [loginModalOpen, resetWalletConnect]);

  if (!loginModalOpen) return null;

  const walletName = (kind: WalletKind) => t(walletNameKey(kind));
  const walletHint = (kind: WalletKind) => {
    if (kind === "tokenPocket") {
      return mobileDevice
        ? t("walletTpMobileDesc")
        : t("walletTokenPocketQrDesc");
    }
    return t("walletRainbowFallbackDesc");
  };
  const busy = wc.state !== "idle";

  const close = () => {
    closeLoginModal();
    setSelected(null);
    wc.reset();
  };

  const selectWallet = (kind: WalletKind) => {
    setSelected(kind);
    wc.reset();
  };

  const startWalletLogin = (kind: WalletKind, mode: "deeplink" | "qr") => {
    setSelected(kind);
    void wc.start(kind, mode);
  };

  return (
    <div
      className="fixed inset-0 z-[120] flex items-end justify-center bg-black/70 px-3 pb-3 pt-10 backdrop-blur-sm md:items-center md:p-6"
      role="dialog"
      aria-modal="true"
      aria-labelledby="wallet-login-title"
    >
      <div className="max-h-[92dvh] w-full max-w-[460px] overflow-y-auto rounded-3xl border border-white/10 bg-[#17171d] p-5 shadow-2xl shadow-black/70 md:p-6">
        <div className="flex items-start justify-between gap-3">
          <div className="min-w-0">
            <h2
              id="wallet-login-title"
              className="text-xl font-semibold text-white"
            >
              {t("walletLoginTitle")}
            </h2>
            <p className="mt-2 text-sm leading-6 text-neutral-400">
              {t("walletLoginDesc")}
            </p>
          </div>
          <button
            type="button"
            onClick={close}
            aria-label={t("close")}
            className="inline-flex h-9 w-9 shrink-0 items-center justify-center rounded-full border border-white/10 text-neutral-300 transition hover:border-ark-gold/50 hover:text-ark-gold"
          >
            <X size={18} />
          </button>
        </div>

        <div className="mt-5 grid gap-2">
          {wallets.map((kind) => {
            const active = selected === kind;
            const connecting = active && wc.state === "connecting";
            const signing = active && wc.state === "signing";
            return (
              <div
                key={kind}
                className={`rounded-2xl border p-3 transition ${
                  active
                    ? "border-ark-gold/60 bg-ark-gold/10"
                    : "border-white/10 bg-[#20202a]"
                }`}
              >
                <button
                  type="button"
                  onClick={() =>
                    mobileDevice
                      ? selectWallet(kind)
                      : startWalletLogin(kind, "qr")
                  }
                  disabled={!wc.available || busy}
                  className="flex w-full items-center gap-3 text-left disabled:cursor-wait disabled:opacity-70"
                >
                  <WalletBrandIcon kind={kind} size={32} />
                  <span className="min-w-0 flex-1">
                    <span className="block text-base font-semibold text-neutral-100">
                      {walletName(kind)}
                    </span>
                    <span className="mt-1 block text-xs leading-5 text-neutral-400">
                      {connecting
                        ? t("walletConnecting")
                        : signing
                          ? t("walletSigning")
                          : walletHint(kind)}
                    </span>
                  </span>
                  {connecting || signing ? (
                    <LoaderCircle className="h-4 w-4 animate-spin text-ark-gold" />
                  ) : null}
                </button>

                {mobileDevice && active ? (
                  <div className="mt-3 grid grid-cols-2 gap-2">
                    <button
                      type="button"
                      onClick={() => startWalletLogin(kind, "deeplink")}
                      disabled={!wc.available || busy}
                      className="rounded-full bg-ark-gold px-3 py-2 text-sm font-bold text-black transition hover:bg-ark-gold2 disabled:cursor-wait disabled:opacity-70"
                    >
                      {t("walletOpenWalletApp")}
                    </button>
                    <button
                      type="button"
                      onClick={() => startWalletLogin(kind, "qr")}
                      disabled={!wc.available || busy}
                      className="rounded-full border border-ark-gold/50 px-3 py-2 text-sm font-semibold text-ark-gold transition hover:bg-ark-gold/10 disabled:cursor-wait disabled:opacity-70"
                    >
                      {t("walletQrLogin")}
                    </button>
                  </div>
                ) : null}
              </div>
            );
          })}
        </div>

        {!wc.available ? (
          <p className="mt-4 rounded-2xl border border-white/10 bg-white/[0.03] px-4 py-3 text-sm text-neutral-400">
            {t("walletRainbowUnavailable")}
          </p>
        ) : null}

        {selected && wc.qrUri ? (
          <div className="mt-4 grid place-items-center gap-2 rounded-2xl bg-white p-4 text-center">
            <QRCodeSVG value={wc.qrUri} size={180} level="M" />
            <p className="text-xs font-medium text-neutral-700">
              {mobileDevice
                ? t("walletTpWaiting")
                : t("walletQrUseAnotherDevice")}
            </p>
          </div>
        ) : null}

        {wc.error ? (
          <p className="mt-4 rounded-2xl border border-red-500/30 bg-red-500/10 px-4 py-3 text-sm text-red-200">
            {wc.error}
          </p>
        ) : null}

        {selected ? (
          <div className="mt-4 rounded-2xl border border-white/10 bg-white/[0.03] px-4 py-3 text-xs leading-5 text-neutral-400">
            <p className="font-semibold text-neutral-200">Wallet debug</p>
            <p>state: {wc.state}</p>
            <p>connected: {wc.isConnected ? "yes" : "no"}</p>
            <p className="break-all">address: {wc.address || "-"}</p>
            <p>qr: {wc.qrUri ? "received" : "-"}</p>
          </div>
        ) : null}

        {selected ? (
          <p className="mt-4 text-xs leading-5 text-amber-300/80">
            {t("walletNetworkWarning")}
          </p>
        ) : null}
      </div>
    </div>
  );
}

function walletNameKey(kind: WalletKind): string {
  if (kind === "tokenPocket") return "walletTokenPocket";
  if (kind === "metaMask") return "walletMetaMask";
  return "walletImToken";
}