"use client";
import { useI18n } from "@/components/I18nProvider";

import { useState } from "react";
import { useRouter } from "next/navigation";
import { ArrowRight, Compass, Mail, ShieldCheck } from "lucide-react";
import { api } from "./StartGame";
import { authActionSchema, authDestination } from "@/shared/account";

type Mode = "login" | "signup" | "recover" | "magic";
export function SignIn({
  next = "/dashboard",
  initialError = "",
}: {
  next?: string;
  initialError?: string;
}) {
  const { t } = useI18n();
  const [mode, setMode] = useState<Mode>("login"),
    [email, setEmail] = useState(""),
    [name, setName] = useState(""),
    [password, setPassword] = useState(""),
    [confirmation, setConfirmation] = useState(""),
    [message, setMessage] = useState(""),
    [error, setError] = useState(initialError),
    [busy, setBusy] = useState(false);
  const router = useRouter();
  function changeMode(value: Mode) {
    setMode(value);
    setError("");
    setMessage("");
    setPassword("");
    setConfirmation("");
  }
  async function submit(event: React.FormEvent) {
    event.preventDefault();
    setError("");
    setMessage("");
    const body =
      mode === "signup"
        ? { action: mode, email, password, displayName: name, next }
        : mode === "login"
          ? { action: mode, email, password, next }
          : mode === "magic"
            ? { action: mode, email, next }
            : { action: mode, email };
    const valid = authActionSchema.safeParse(body);
    if (!valid.success) {
      setError(valid.error.issues[0].message);
      return;
    }
    if (mode === "signup" && password !== confirmation) {
      setError("Your passwords do not match.");
      return;
    }
    setBusy(true);
    try {
      const result = await api<{ next?: string; message?: string }>(
        "auth",
        valid.data,
      );
      setPassword("");
      setConfirmation("");
      if (result.next) {
        router.replace(authDestination(result.next));
        router.refresh();
      } else setMessage(result.message ?? "Check your email to continue.");
    } catch (e) {
      setError((e as Error).message);
    } finally {
      setBusy(false);
    }
  }
  const title = {
    login: "Welcome back.",
    signup: "Make yourself at home.",
    recover: "Find your way back.",
    magic: "An email, a way in.",
  }[mode];
  return (
    <div className="auth-layout">
      <aside className="auth-story">
        <span className="eyebrow">{t("YOUR NEXT EXPEDITION")}</span>
        <h1>
          {t("A familiar world.")}
          <br />
          {t("Your own perspective.")}
        </h1>
        <p>
          {t(
            "Keep your journeys, share the places you know, and help build the next map.",
          )}
        </p>
        <div className="auth-story-map" aria-hidden="true">
          <Compass size={52} />
          <span>{t("Every world has a story.")}</span>
        </div>
        <div className="auth-benefits">
          <span>
            <Compass size={18} />
            {t("Save your expeditions")}
          </span>
          <span>
            <ShieldCheck size={18} />
            {t("Keep control of your maps")}
          </span>
        </div>
      </aside>
      <section className="auth-card">
        <div className="auth-tabs" aria-label={t("Account options")}>
          <button
            type="button"
            aria-pressed={mode === "login"}
            disabled={busy}
            onClick={() => changeMode("login")}
          >
            {t("Log in")}
          </button>
          <button
            type="button"
            aria-pressed={mode === "signup"}
            disabled={busy}
            onClick={() => changeMode("signup")}
          >
            {t("Create account")}
          </button>
        </div>
        <span className="eyebrow">{t("YOUR CARTOGRAPHER ACCOUNT")}</span>
        <h2>{t(title)}</h2>
        <p className="muted">
          {mode === "signup"
            ? t("Choose the name people will see on your maps.")
            : mode === "recover"
              ? t("We’ll email you a link to set a new password.")
              : mode === "magic"
                ? t(
                    "For existing accounts. Open the link on this device to continue.",
                  )
                : t("Log in with your email and password.")}
        </p>
        <form onSubmit={submit} aria-busy={busy}>
          {mode === "signup" && (
            <label className="field">
              {t("Display name")}
              <input
                name="displayName"
                autoComplete="nickname"
                minLength={2}
                maxLength={32}
                value={name}
                onChange={(e) => setName(e.target.value)}
                placeholder={t("How should we call you?")}
                required
                disabled={busy}
              />
              <small>
                {t("2–32 characters. You can change it in settings.")}
              </small>
            </label>
          )}
          <label className="field">
            {t("Email address")}
            <input
              name="email"
              type="email"
              autoComplete="email"
              value={email}
              onChange={(e) => setEmail(e.target.value)}
              placeholder="you@example.com"
              required
              disabled={busy}
            />
          </label>
          {(mode === "login" || mode === "signup") && (
            <label className="field">
              {t("Password")}
              <input
                name="password"
                type="password"
                autoComplete={
                  mode === "signup" ? "new-password" : "current-password"
                }
                minLength={mode === "signup" ? 12 : 1}
                value={password}
                onChange={(e) => setPassword(e.target.value)}
                required
                disabled={busy}
              />
              {mode === "signup" && (
                <small>
                  {t(
                    "Use at least 12 characters. A unique passphrase works well.",
                  )}
                </small>
              )}
            </label>
          )}
          {mode === "signup" && (
            <label className="field">
              {t("Confirm password")}
              <input
                name="confirmPassword"
                type="password"
                autoComplete="new-password"
                value={confirmation}
                onChange={(e) => setConfirmation(e.target.value)}
                required
                disabled={busy}
              />
            </label>
          )}
          {mode === "login" && (
            <button
              type="button"
              className="text-link auth-recovery"
              disabled={busy}
              onClick={() => changeMode("recover")}
            >
              {t("Forgot password?")}
            </button>
          )}
          {error && (
            <p role="alert" className="error-message">
              {t(error)}
            </p>
          )}
          {message && (
            <p role="status" className="success-message">
              {t(message)}
            </p>
          )}
          <button className="button primary full" disabled={busy}>
            {mode === "recover" || mode === "magic" ? (
              <Mail size={17} />
            ) : (
              <ArrowRight size={17} />
            )}{" "}
            {busy
              ? t("Please wait…")
              : {
                  login: t("Log in"),
                  signup: t("Create account"),
                  recover: t("Send reset link"),
                  magic: t("Send sign-in link"),
                }[mode]}
          </button>
        </form>
        {mode === "login" && (
          <div className="auth-alternative">
            <span>{t("Already use email links?")}</span>
            <button
              type="button"
              className="text-link"
              disabled={busy}
              onClick={() => changeMode("magic")}
            >
              {t("Send me a sign-in link")}
            </button>
          </div>
        )}
        {(mode === "recover" || mode === "magic") && (
          <button
            type="button"
            className="text-link auth-back"
            disabled={busy}
            onClick={() => changeMode("login")}
          >
            {t("← Back to log in")}
          </button>
        )}
        <p className="auth-footnote">
          {t(
            "Your email stays private. Your display name appears with your maps.",
          )}
        </p>
      </section>
    </div>
  );
}