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import {
requestPasswordResetOtp,
verifyPasswordResetOtp,
resetPassword,
} from '@/services/authService';
import { ApiError } from '@/services/api';
import { validateEmail, validateOtp, validatePassword } from '@/utils/validators';
export type ForgotPasswordStep = 'email' | 'otp' | 'reset';
export interface ForgotPasswordFormData {
email: string;
otp: string;
newPassword: string;
}
export interface ForgotPasswordFormErrors {
email?: string | null;
otp?: string | null;
newPassword?: string | null;
}
export interface ForgotPasswordViewModel {
step: ForgotPasswordStep;
formData: ForgotPasswordFormData;
errors: ForgotPasswordFormErrors;
isLoading: boolean;
apiError: string | null;
successMessage: string | null;
handleRequestOtp: () => Promise<void>;
handleVerifyOtp: () => Promise<void>;
handleResetPassword: () => Promise<boolean>;
updateField: <K extends keyof ForgotPasswordFormData>(
field: K,
value: ForgotPasswordFormData[K],
) => void;
goBack: () => void;
}
const INITIAL_FORM_DATA: ForgotPasswordFormData = {
email: '',
otp: '',
newPassword: '',
};
const OTP_ERROR_CODES = new Set(['invalid_otp', 'otp_attempts_exceeded']);
export function useForgotPasswordViewModel(): ForgotPasswordViewModel {
const [step, setStep] = useState<ForgotPasswordStep>('email');
const [formData, setFormData] =
useState<ForgotPasswordFormData>(INITIAL_FORM_DATA);
const [errors, setErrors] = useState<ForgotPasswordFormErrors>({});
const [isLoading, setIsLoading] = useState(false);
const [apiError, setApiError] = useState<string | null>(null);
const [successMessage, setSuccessMessage] = useState<string | null>(null);
const [resetToken, setResetToken] = useState<string | null>(null);
const updateField = useCallback(
<K extends keyof ForgotPasswordFormData>(
field: K,
value: ForgotPasswordFormData[K],
) => {
setFormData((prev) => ({ ...prev, [field]: value }));
setErrors((prev) => ({ ...prev, [field]: null }));
setApiError(null);
},
[],
);
const handleRequestOtp = useCallback(async () => {
const trimmedEmail = formData.email.trim();
const emailError = validateEmail(trimmedEmail);
if (emailError) {
setErrors({ email: emailError });
return;
}
setIsLoading(true);
setApiError(null);
try {
await requestPasswordResetOtp({ email: trimmedEmail });
setFormData((prev) => ({ ...prev, email: trimmedEmail }));
setStep('otp');
} catch (err) {
if (err instanceof ApiError) {
setApiError(err.message);
} else {
setApiError('An unexpected error occurred. Please try again.');
}
} finally {
setIsLoading(false);
}
}, [formData.email]);
const handleVerifyOtp = useCallback(async () => {
const otpError = validateOtp(formData.otp);
if (otpError) {
setErrors((prev) => ({ ...prev, otp: otpError }));
return;
}
setIsLoading(true);
setApiError(null);
try {
const grant = await verifyPasswordResetOtp({
email: formData.email,
otp: formData.otp,
});
setResetToken(grant.reset_token);
setStep('reset');
} catch (err) {
if (err instanceof ApiError) {
if (OTP_ERROR_CODES.has(err.code)) {
setFormData((prev) => ({ ...prev, otp: '' }));
setErrors({ otp: err.message });
}
setApiError(err.message);
} else E{
setApiError('An unexpected error occurred. Please try again.');
}
} finally {
setIsLoading(false);
}
}, [formData.email, formData.otp]);
const handleResetPassword = useCallback(async (): Promise<boolean> => {
const passwordError = validatePassword(formData.newPassword);
if (passwordError) {
setErrors((prev) => ({ ...prev, newPassword: passwordError }));
return false;
}
Iif (!resetToken) {
setApiError('Reset session expired. Please start over.');
return false;
}
setIsLoading(true);
setApiError(null);
try {
const result = await resetPassword({
email: formData.email,
reset_token: resetToken,
new_password: formData.newPassword,
});
setSuccessMessage(result.message);
return true;
} catch (err) {
if (err instanceof ApiError) {
setApiError(err.message);
} else {
setApiError('An unexpected error occurred. Please try again.');
}
return false;
} finally {
setIsLoading(false);
}
}, [formData.email, formData.newPassword, resetToken]);
const goBack = useCallback(() => {
setApiError(null);
setErrors({});
if (step === 'otp') {
setFormData((prev) => ({ ...prev, otp: '' }));
setStep('email');
} else Eif (step === 'reset') {
setFormData((prev) => ({ ...prev, otp: '', newPassword: '' }));
setResetToken(null);
setStep('otp');
}
}, [step]);
return {
step,
formData,
errors,
isLoading,
apiError,
successMessage,
handleRequestOtp,
handleVerifyOtp,
handleResetPassword,
updateField,
goBack,
};
}
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