// "Forgot password": ask for a code (it is sent to the account's notification topic), then choose a new
// password with it. Shown on the sign-in page in place of the sign-in form.
import { useState } from 'react';
import { requestPasswordReset, resetPassword } from '../syncService.js';

const input = 'mt-1 block w-full rounded-xl border border-[var(--r-line)] bg-[var(--r-bg)] px-3 py-2.5 text-sm text-[var(--r-text)]';
const primary = 'w-full rounded-full bg-[var(--r-accent)] px-4 py-2.5 text-sm font-medium text-[var(--r-on)] transition hover:opacity-90 disabled:cursor-not-allowed disabled:opacity-50';

export default function ResetPasswordForm({ initialEmail = '', onDone, onBack }) {
  const [step, setStep] = useState('ask'); // 'ask' | 'code' | 'done'
  const [email, setEmail] = useState(initialEmail);
  const [form, setForm] = useState({ code: '', password: '', token: '' });
  const [message, setMessage] = useState('');
  const [error, setError] = useState('');
  const [busy, setBusy] = useState(false);

  const ask = async (e) => {
    e.preventDefault();
    setError(''); setBusy(true);
    const result = await requestPasswordReset(email.trim());
    setBusy(false);
    if (!result.ok) { setError(result.error ?? 'Something went wrong.'); return; }
    setMessage(result.data?.message ?? 'If that account has a notification topic, a code was sent.');
    setStep('code');
  };

  const reset = async (e) => {
    e.preventDefault();
    setError(''); setBusy(true);
    const result = await resetPassword({ email: email.trim(), code: form.code, newPassword: form.password, token: form.token.trim() || undefined });
    setBusy(false);
    if (!result.ok) { setError(result.error ?? 'Something went wrong.'); return; }
    setStep('done');
  };

  if (step === 'done') {
    return (
      <div>
        <h2 className="text-xl font-medium">Password changed</h2>
        <p className="mt-2 text-sm text-[var(--r-sub)]">You’ve been signed out everywhere. Sign in with your new password.</p>
        <button type="button" onClick={onDone} className={`mt-6 ${primary}`}>Back to sign in</button>
      </div>
    );
  }

  return (
    <div>
      <h2 className="text-xl font-medium">Reset your password</h2>
      {step === 'ask' ? (
        <form onSubmit={ask} className="mt-4 space-y-4">
          <p className="text-sm text-[var(--r-sub)]">We’ll send a one-time code to the notification topic you set up for reading reminders (ntfy).</p>
          <label className="block text-sm">Email
            <input type="email" required autoComplete="email" value={email} onChange={(e) => setEmail(e.target.value)} className={input} />
          </label>
          {error && <p role="alert" className="text-sm text-[var(--r-danger,#b42318)]">{error}</p>}
          <button type="submit" disabled={busy} className={primary}>{busy ? 'Please wait…' : 'Send me a code'}</button>
          <button type="button" onClick={() => { setStep('code'); setMessage(''); }} className="block w-full text-center text-sm text-[var(--r-sub)] underline hover:text-[var(--r-text)]">I already have a code</button>
        </form>
      ) : (
        <form onSubmit={reset} className="mt-4 space-y-4">
          {message && <p role="status" className="text-sm text-[var(--r-sub)]">{message}</p>}
          <label className="block text-sm">Email
            <input type="email" required value={email} onChange={(e) => setEmail(e.target.value)} className={input} />
          </label>
          <label className="block text-sm">Code
            <input type="text" required autoFocus autoComplete="one-time-code" value={form.code} onChange={(e) => setForm((f) => ({ ...f, code: e.target.value }))} className={`${input} text-center font-mono tracking-widest`} placeholder="ABCD2345" />
          </label>
          <label className="block text-sm">New password
            <input type="password" required minLength={8} autoComplete="new-password" value={form.password} onChange={(e) => setForm((f) => ({ ...f, password: e.target.value }))} className={input} />
            <span className="mt-1 block text-xs text-[var(--r-sub)]">At least 8 characters.</span>
          </label>
          <label className="block text-sm">Authenticator code <span className="text-xs text-[var(--r-sub)]">(only if you use two-factor sign-in)</span>
            <input type="text" inputMode="numeric" value={form.token} onChange={(e) => setForm((f) => ({ ...f, token: e.target.value }))} className={input} placeholder="123456" />
          </label>
          {error && <p role="alert" className="text-sm text-[var(--r-danger,#b42318)]">{error}</p>}
          <button type="submit" disabled={busy} className={primary}>{busy ? 'Please wait…' : 'Change password'}</button>
        </form>
      )}
      <button type="button" onClick={onBack} className="mt-4 w-full text-center text-sm text-[var(--r-sub)] underline hover:text-[var(--r-text)]">Back to sign in</button>
    </div>
  );
}