import { DateType } from "react-native-ui-datepicker";

/**
 * Trasforma una data da "YYYY-MM-DD" a "DD/MM/YYYY"
 * @param dateStr stringa data in formato ISO "YYYY-MM-DD"
 * @returns stringa formattata "DD/MM/YYYY"
 */
export const formatDate = (dateStr: string | null | undefined): string => {
    if (!dateStr) return '';
    const [year, month, day] = dateStr.split('-');
    return `${day}/${month}/${year}`;
};

/**
 * Trasforma un'ora da "HH:MM:SS" a "HH:MM"
 * @param timeStr stringa ora in formato "HH:MM:SS"
 * @returns stringa formattata "HH:MM"
 */
export const formatTime = (timeStr: string | null | undefined): string => {
    if (!timeStr) return '';
    const [hours, minutes] = timeStr.split(':');
    return `${hours}:${minutes}`;
};

/**
 * Formatta una data per l'uso con un date picker, normalizzandola a mezzanotte
 * @param d Data in formato DateType
 * @returns stringa data in formato "YYYY-MM-DD" o null se l'input è null/undefined
 */
export const formatPickerDate = (d: DateType | null | undefined) => {
    if (!d) return null;

    const date = new Date(d as string | number | Date);
    const normalized = new Date(date.getFullYear(), date.getMonth(), date.getDate());

    const yyyy = normalized.getFullYear();
    const mm = String(normalized.getMonth() + 1).padStart(2, "0");
    const dd = String(normalized.getDate()).padStart(2, "0");

    return `${yyyy}-${mm}-${dd}`;
}