"use client";
import { useEffect, useRef, useState } from "react";
import { usePathname } from "next/navigation";
import { Copy, KeyRound } from "lucide-react";
import { useI18n } from "./I18nProvider";
import { api } from "@/lib/client-api";
import { generateInitialPassword } from "@/shared/initial-password";

export function LegacyPasswordNotice({ enabled }: { enabled: boolean }) {
  const { t } = useI18n();
  const pathname = usePathname();
  const dialog = useRef<HTMLDialogElement>(null);
  const [needed, setNeeded] = useState(false);
  const [password, setPassword] = useState("");
  const [busy, setBusy] = useState(false);
  const [saved, setSaved] = useState(false);
  const [copied, setCopied] = useState(false);
  const [error, setError] = useState("");
  useEffect(() => {
    if (!enabled || pathname?.startsWith("/auth/") || password) return;
    let active = true;
    api<{ needed: boolean }>("auth/initial-password")
      .then((data) => {
        if (active) setNeeded(data.needed);
      })
      .catch(() => {});
    return () => {
      active = false;
    };
  }, [enabled, pathname, password]);
  useEffect(() => {
    if (!needed) return;
    const element = dialog.current;
    element?.showModal();
    return () => {
      element?.close();
    };
  }, [needed]);
  async function generate() {
    if (busy) return;
    setBusy(true);
    setError("");
    const generated = generateInitialPassword();
    try {
      await api("auth/initial-password", { password: generated });
      // Only keep the confirmed password in this mounted dialog's memory.
      setPassword(generated);
    } catch (e) {
      setError((e as Error).message);
    } finally {
      setBusy(false);
    }
  }
  function dismiss() {
    setNeeded(false);
    setPassword("");
    setSaved(false);
    setCopied(false);
    setError("");
  }
  async function copy() {
    try {
      await navigator.clipboard.writeText(password);
      setCopied(true);
    } catch {
      setError("Select the password and copy it manually.");
    }
  }
  if (!needed) return null;
  return (
    <dialog
      ref={dialog}
      className="report-dialog legacy-password-dialog"
      aria-labelledby="legacy-password-title"
      onCancel={(event) => {
        if (password || busy) event.preventDefault();
        else dismiss();
      }}
    >
      <KeyRound size={28} aria-hidden="true" />
      <h2 id="legacy-password-title">
        {password
          ? t("Your one-time password screen.")
          : t("Your account needs a password.")}
      </h2>
      <p>
        {password
          ? t(
              "Save this password now. After you close this screen, it cannot be shown again. You can change it in account settings.",
            )
          : t(
              "You joined before passwords were required. Create a strong password for email-and-password login.",
            )}
      </p>
      {password ? (
        <>
          <label className="field">
            {t("Your new account password")}
            <input
              readOnly
              value={password}
              autoComplete="off"
              spellCheck={false}
            />
          </label>
          <button className="button" onClick={copy}>
            <Copy size={16} aria-hidden="true" />
            {copied ? t("Copied") : t("Copy password")}
          </button>
          <label className="password-saved">
            <input
              type="checkbox"
              checked={saved}
              onChange={(e) => setSaved(e.target.checked)}
            />
            {t("I saved this password somewhere safe.")}
          </label>
          <button
            className="button primary full"
            disabled={!saved}
            onClick={dismiss}
          >
            {t("Done — I saved it")}
          </button>
        </>
      ) : (
        <>
          <button
            className="button primary full"
            disabled={busy}
            onClick={generate}
          >
            {busy ? t("Creating password…") : t("Create and show my password")}
          </button>
          <button className="text-link" disabled={busy} onClick={dismiss}>
            {t("Not now")}
          </button>
        </>
      )}
      {error && (
        <p role="alert" className="error-message">
          {t(error)}
        </p>
      )}
    </dialog>
  );
}