import { useEffect, useState } from "react";
import { useI18n } from "../i18n";
import { openWalletDeepLink } from "./deepLinks";
import { getInjectedWallet, type WalletKind } from "./injected";
import { useWallet } from "./WalletProvider";

type ModalState = "idle" | "signing";

type WalletOption = {
  kind: WalletKind;
  labelKey: string;
};

const walletOptions: WalletOption[] = [
  { kind: "tokenPocket", labelKey: "walletTokenPocket" },
  { kind: "metaMask", labelKey: "walletMetaMask" },
  { kind: "imToken", labelKey: "walletImToken" },
];

function isMobileDevice(): boolean {
  if (typeof navigator === "undefined") return false;
  const ua = navigator.userAgent || "";
  return (
    /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini|Mobile/i.test(
      ua,
    ) ||
    (/Macintosh/i.test(ua) && navigator.maxTouchPoints > 1)
  );
}

export function WalletLoginModal() {
  const { t } = useI18n();
  const { closeLoginModal, loginModalOpen, signInInjected } = useWallet();
  const [state, setState] = useState<ModalState>("idle");
  const [error, setError] = useState("");
  const [mobileDevice, setMobileDevice] = useState(false);
  const [selectedWallet, setSelectedWallet] = useState<WalletKind | null>(null);

  useEffect(() => {
    if (!loginModalOpen) return;
    setMobileDevice(isMobileDevice());
    setSelectedWallet(null);
    setError("");
  }, [loginModalOpen]);

  const close = () => {
    if (state === "signing") return;
    closeLoginModal();
    setError("");
  };

  if (!loginModalOpen) return null;

  const walletName = (kind: WalletKind) => {
    if (kind === "tokenPocket") return t("walletTokenPocket");
    if (kind === "metaMask") return t("walletMetaMask");
    return t("walletImToken");
  };

  const chooseWallet = async (kind: WalletKind) => {
    setError("");
    setSelectedWallet(kind);

    const injectedWallet = getInjectedWallet(kind);
    if (!injectedWallet) {
      if (mobileDevice) {
        openWalletDeepLink(kind);
        return;
      }
      setError(
        t("walletInstallSelected").replace("{wallet}", walletName(kind)),
      );
      return;
    }

    setState("signing");
    await signInInjected(kind)
      .catch((err) => {
        setError(err instanceof Error ? err.message : t("walletLoginFailed"));
      })
      .finally(() => setState("idle"));
  };

  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-[520px] 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-4">
          <div>
            <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}
            className="rounded-full border border-white/10 px-3 py-1.5 text-sm text-neutral-300 transition hover:border-ark-gold/50 hover:text-ark-gold"
          >
            {t("close")}
          </button>
        </div>

        <div className="mt-5 grid gap-3">
          <p className="text-sm font-medium text-neutral-300">
            {mobileDevice ? t("walletChooseMobile") : t("walletChooseDesktop")}
          </p>
          <div className="grid gap-2">
            {walletOptions.map((option) => {
              const signingThis =
                state === "signing" && selectedWallet === option.kind;
              return (
                <button
                  key={option.kind}
                  type="button"
                  onClick={() => void chooseWallet(option.kind)}
                  disabled={state === "signing"}
                  className="flex items-center justify-between rounded-2xl border border-white/10 bg-[#20202a] px-4 py-4 text-left text-base font-semibold text-neutral-100 transition hover:border-ark-gold/50 hover:bg-ark-gold/10 disabled:cursor-wait disabled:opacity-70"
                >
                  <span>{t(option.labelKey)}</span>
                  <span className="text-sm text-ark-gold">
                    {signingThis
                      ? t("walletSigning")
                      : mobileDevice
                        ? t("walletOpen")
                        : t("walletConnect")}
                  </span>
                </button>
              );
            })}
          </div>
          {!mobileDevice ? (
            <p className="rounded-2xl border border-white/10 bg-white/[0.03] px-4 py-3 text-xs leading-5 text-neutral-400">
              {t("walletDesktopHint")}
            </p>
          ) : null}
        </div>

        {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">
            {error}
          </p>
        ) : null}
      </div>
    </div>
  );
}