import { UntypedFormControl, ValidationErrors } from '@angular/forms';

export const EmailValidator = (confirmEmailInput: string): ValidationErrors | null => {
    let confirmEmailControl: UntypedFormControl;
    let emailControl: UntypedFormControl;

    return (control: UntypedFormControl) => {
        if (!control.parent) {
            return null;
        }

        if (!confirmEmailControl) {
            confirmEmailControl = control;
            emailControl = control.parent.get(confirmEmailInput) as UntypedFormControl;
            emailControl.valueChanges.subscribe(() => {
                confirmEmailControl.updateValueAndValidity();
            });
        }

        if (emailControl.value.toLocaleLowerCase() !== confirmEmailControl.value.toLocaleLowerCase()) {
            return {
                notMatch: true
            };
        }
        return null;
    };
};