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import { parsePhoneNumber, isValidPhoneNumber } from "libphonenumber-js";
import { authClient } from "../../lib/auth-client";
import { authApi } from "../../lib/api";
interface PhoneOtpFormProps {
onSuccess: () => void;
mode?: "sign-in" | "sign-up";
}
const RESEND_COUNTDOWN_SECONDS = 60;
const OTP_LENGTH = 6;
const COUNTDOWN_STORAGE_KEY = "otp_countdown_end";
export function PhoneOtpForm({ onSuccess, mode = "sign-in" }: PhoneOtpFormProps) {
const [step, setStep] = useState<"phone" | "otp">("phone");
const [fullName, setFullName] = useState("");
const [phoneNumber, setPhoneNumber] = useState("");
const [countryCode] = useState("+91");
const [otp, setOtp] = useState<string[]>(() => Array(OTP_LENGTH).fill(""));
const [isLoading, setIsLoading] = useState(false);
const [error, setError] = useState<string | null>(null);
const [resendCountdown, setResendCountdown] = useState(0);
const otpInputRefs = useRef<(HTMLInputElement | null)[]>([]);
const countdownRef = useRef<ReturnType<typeof setInterval> | null>(null);
const startCountdownTimer = useCallback((seconds: number) => {
setResendCountdown(seconds);
if (countdownRef.current) {
clearInterval(countdownRef.current);
}
countdownRef.current = setInterval(() => {
setResendCountdown((prev) => {
if (prev <= 1) {
Eif (countdownRef.current) {
clearInterval(countdownRef.current);
}
sessionStorage.removeItem(COUNTDOWN_STORAGE_KEY);
return 0;
}
return prev - 1;
});
}, 1000);
}, []);
const startResendCountdown = useCallback((seconds: number = RESEND_COUNTDOWN_SECONDS) => {
sessionStorage.setItem(COUNTDOWN_STORAGE_KEY, String(Date.now() + seconds * 1000));
startCountdownTimer(seconds);
}, [startCountdownTimer]);
// On mount, restore any active countdown from sessionStorage
useEffect(() => {
const endTime = sessionStorage.getItem(COUNTDOWN_STORAGE_KEY);
if (endTime) {
const remaining = Math.ceil((parseInt(endTime, 10) - Date.now()) / 1000);
if (remaining > 0) {
startCountdownTimer(remaining);
} else E{
sessionStorage.removeItem(COUNTDOWN_STORAGE_KEY);
}
}
}, [startCountdownTimer]);
useEffect(() => {
return () => {
if (countdownRef.current) {
clearInterval(countdownRef.current);
}
};
}, []);
const getFullPhoneNumber = useCallback(() => {
return `${countryCode}${phoneNumber}`;
}, [countryCode, phoneNumber]);
const validatePhone = useCallback(() => {
const trimmed = phoneNumber.trim();
if (!trimmed) {
setError("Please enter your phone number");
return false;
}
const full = getFullPhoneNumber();
try {
if (!isValidPhoneNumber(full)) {
setError("Please enter a valid phone number");
return false;
}
} catch {
setError("Please enter a valid phone number");
return false;
}
return true;
}, [phoneNumber, getFullPhoneNumber]);
const handleSendOtp = useCallback(async () => {
setError(null);
if (!validatePhone()) return;
setIsLoading(true);
try {
const fullPhone = getFullPhoneNumber();
const parsed = parsePhoneNumber(fullPhone);
const e164 = parsed.format("E.164");
// For sign-in: check if phone is registered before sending OTP
if (mode === "sign-in") {
const { exists } = await authApi.checkPhone(e164);
if (!exists) {
setError("No account found with this phone number. Please sign up first.");
setIsLoading(false);
return;
}
}
// For sign-up: check if phone is already registered before sending OTP
if (mode === "sign-up") {
const { exists } = await authApi.checkPhone(e164);
if (exists) {
setError("This phone number is already registered. Please sign in instead.");
setIsLoading(false);
return;
}
}
const sendResult = await authClient.phoneNumber.sendOtp({
phoneNumber: e164,
});
// Check for error response from better-auth
if (sendResult?.error) {
setError(sendResult.error.message || "Failed to send OTP. Please try again.");
setIsLoading(false);
return;
}
setStep("otp");
startResendCountdown();
// Focus first OTP box after transition
setTimeout(() => {
otpInputRefs.current[0]?.focus();
}, 50);
} catch (err: unknown) {
const message =
err instanceof Error ? err.message : "Failed to send OTP. Please try again.";
setError(message);
} finally {
setIsLoading(false);
}
}, [validatePhone, getFullPhoneNumber, startResendCountdown, mode]);
const handleVerifyOtp = useCallback(
async (otpValue: string) => {
setError(null);
setIsLoading(true);
try {
const fullPhone = getFullPhoneNumber();
const parsed = parsePhoneNumber(fullPhone);
const e164 = parsed.format("E.164");
const result = await authClient.phoneNumber.verify({
phoneNumber: e164,
code: otpValue,
});
// better-auth client returns { data, error } — check for error
if (result?.error) {
setError(result.error.message || "Invalid OTP. Please try again.");
setIsLoading(false);
return;
}
// If signing up with a name, update the user profile
if (mode === "sign-up" && fullName.trim()) {
try {
await authApi.updateProfile({ name: fullName.trim() });
} catch {
// Non-fatal — name can be updated later
}
}
onSuccess();
} catch (err: unknown) {
const rawMsg = err instanceof Error ? err.message : "Invalid OTP. Please try again.";
const message = rawMsg.toLowerCase().includes("unique") || rawMsg.toLowerCase().includes("already")
? "This phone number is already registered. Please sign in instead."
: rawMsg;
setError(message);
} finally {
setIsLoading(false);
}
},
[getFullPhoneNumber, onSuccess, mode, fullName],
);
const handleOtpChange = useCallback(
(index: number, value: string) => {
// Only allow single digit
const digit = value.replace(/\D/g, "").slice(-1);
const newOtp = [...otp];
newOtp[index] = digit;
setOtp(newOtp);
setError(null);
if (digit && index < OTP_LENGTH - 1) {
otpInputRefs.current[index + 1]?.focus();
}
// Auto-submit when last digit is filled
if (digit && index === OTP_LENGTH - 1) {
const filledOtp = newOtp.join("");
Eif (filledOtp.length === OTP_LENGTH) {
handleVerifyOtp(filledOtp);
}
}
},
[otp, handleVerifyOtp],
);
const handleOtpKeyDown = useCallback(
(index: number, e: React.KeyboardEvent<HTMLInputElement>) => {
if (e.key === "Backspace") {
if (otp[index]) {
// Clear current box
const newOtp = [...otp];
newOtp[index] = "";
setOtp(newOtp);
I} else if (index > 0) {
// Move to previous box
otpInputRefs.current[index - 1]?.focus();
}
}
},
[otp],
);
const handleOtpPaste = useCallback(
(e: React.ClipboardEvent<HTMLInputElement>) => {
e.preventDefault();
const pasted = e.clipboardData.getData("text").replace(/\D/g, "").slice(0, OTP_LENGTH);
if (!pasted) return;
const newOtp = Array(OTP_LENGTH).fill("");
for (let i = 0; i < pasted.length; i++) {
newOtp[i] = pasted[i];
}
setOtp(newOtp);
setError(null);
// Focus the next empty box or the last filled box
const nextEmpty = pasted.length < OTP_LENGTH ? pasted.length : OTP_LENGTH - 1;
otpInputRefs.current[nextEmpty]?.focus();
// Auto-submit if all 6 digits pasted
if (pasted.length === OTP_LENGTH) {
handleVerifyOtp(pasted);
}
},
[handleVerifyOtp],
);
const handleChangePhone = useCallback(() => {
setStep("phone");
setOtp(Array(OTP_LENGTH).fill(""));
setError(null);
Eif (countdownRef.current) {
clearInterval(countdownRef.current);
}
setResendCountdown(0);
sessionStorage.removeItem(COUNTDOWN_STORAGE_KEY);
}, []);
const handleResend = useCallback(async () => {
Iif (resendCountdown > 0) return;
setError(null);
setIsLoading(true);
try {
const fullPhone = getFullPhoneNumber();
const parsed = parsePhoneNumber(fullPhone);
const e164 = parsed.format("E.164");
const resendResult = await authClient.phoneNumber.sendOtp({
phoneNumber: e164,
});
if (resendResult?.error) {
setError(resendResult.error.message || "Failed to resend OTP. Please try again.");
setIsLoading(false);
return;
}
setOtp(Array(OTP_LENGTH).fill(""));
startResendCountdown();
setTimeout(() => {
otpInputRefs.current[0]?.focus();
}, 50);
} catch (err: unknown) {
const message =
err instanceof Error ? err.message : "Failed to resend OTP. Please try again.";
setError(message);
} finally {
setIsLoading(false);
}
}, [resendCountdown, getFullPhoneNumber, startResendCountdown]);
const formattedPhone = phoneNumber
? `${countryCode} ${phoneNumber}`
: "";
if (step === "otp") {
return (
<div className="space-y-4">
<div>
<p className="text-sm text-muted-foreground">
Enter the 6-digit code sent to your WhatsApp{" "}
<span className="font-medium text-foreground">{formattedPhone}</span>
</p>
<button
type="button"
onClick={handleChangePhone}
className="text-xs text-primary underline mt-1 hover:no-underline"
>
Change phone number
</button>
</div>
{error && (
<p role="alert" className="text-sm text-destructive">
{error}
</p>
)}
<div>
<label htmlFor="otp-0" className="block text-sm font-medium text-foreground mb-2">
Verification code
</label>
<fieldset className="flex gap-2 border-0 p-0 m-0" aria-label="OTP input">
{otp.map((digit, index) => (
<input
// biome-ignore lint/suspicious/noArrayIndexKey: OTP boxes are positional
key={index}
ref={(el) => {
otpInputRefs.current[index] = el;
}}
type="text"
inputMode="numeric"
maxLength={1}
value={digit}
onChange={(e) => handleOtpChange(index, e.target.value)}
onKeyDown={(e) => handleOtpKeyDown(index, e)}
onPaste={handleOtpPaste}
id={`otp-${index}`}
aria-label={`OTP digit ${index + 1}`}
className="w-10 h-12 text-center text-lg font-medium border border-input rounded-md bg-background text-foreground focus:outline-none focus:ring-2 focus:ring-primary focus:border-primary disabled:opacity-50"
disabled={isLoading}
/>
))}
</fieldset>
</div>
<div className="text-xs text-muted-foreground">
{resendCountdown > 0 ? (
<span>Resend WhatsApp OTP in {resendCountdown}s</span>
) : (
<button
type="button"
onClick={handleResend}
disabled={isLoading}
className="text-primary underline hover:no-underline disabled:opacity-50"
>
Resend WhatsApp OTP
</button>
)}
</div>
</div>
);
}
return (
<div className="space-y-4">
{error && (
<p role="alert" className="text-sm text-destructive">
{error}
</p>
)}
{mode === "sign-up" && (
<div>
<label htmlFor="phone-full-name" className="block text-sm font-medium text-foreground mb-1">
Full Name
</label>
<input
id="phone-full-name"
type="text"
value={fullName}
onChange={(e) => setFullName(e.target.value)}
placeholder="Your full name"
disabled={isLoading}
className="w-full h-10 px-3 border border-input rounded-md bg-background text-foreground text-sm focus:outline-none focus:ring-2 focus:ring-primary focus:border-primary disabled:opacity-50"
/>
</div>
)}
<div>
<label htmlFor="phone-number" className="block text-sm font-medium text-foreground mb-1">
Phone number
</label>
<div className="flex gap-2">
<div className="flex items-center px-3 border border-input rounded-md bg-muted text-foreground text-sm h-10 min-w-[72px]">
<span>🇮🇳 {countryCode}</span>
</div>
<input
id="phone-number"
type="tel"
value={phoneNumber}
onChange={(e) => {
setPhoneNumber(e.target.value.replace(/\D/g, ""));
setError(null);
}}
onKeyDown={(e) => {
Eif (e.key === "Enter") {
handleSendOtp();
}
}}
placeholder="98765 43210"
disabled={isLoading}
className="flex-1 h-10 px-3 border border-input rounded-md bg-background text-foreground text-sm focus:outline-none focus:ring-2 focus:ring-primary focus:border-primary disabled:opacity-50"
aria-label="Phone number"
/>
</div>
</div>
<button
type="button"
onClick={handleSendOtp}
disabled={isLoading}
className="w-full h-10 px-4 bg-primary text-primary-foreground text-sm font-medium rounded-md hover:bg-primary/90 disabled:opacity-50 disabled:cursor-not-allowed transition-colors"
>
{isLoading ? "Sending..." : "Send WhatsApp OTP"}
</button>
</div>
);
}
|