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}`;
}

/**
 * Trasforma un timestamp in stringa "DD/MM/YYYY HH:mm:ss"
 * @param timestamp stringa o oggetto Date
 * @returns stringa formattata oppure vuota se input non valido
 */
export const formatTimestamp = (timestamp: string | Date | null | undefined): string => {
    if (!timestamp) return '';

    const date = timestamp instanceof Date ? timestamp : new Date(timestamp);
    if (isNaN(date.getTime())) return '';

    const dd = String(date.getDate()).padStart(2, '0');
    const mm = String(date.getMonth() + 1).padStart(2, '0'); // mesi da 0 a 11
    const yyyy = date.getFullYear();

    const hh = String(date.getHours()).padStart(2, '0');
    const min = String(date.getMinutes()).padStart(2, '0');
    const ss = String(date.getSeconds()).padStart(2, '0');

    return `${dd}/${mm}/${yyyy} ${hh}:${min}:${ss}`;
};

/**
 * Converte un timestamp ISO in oggetto Date
 * @param dateStr stringa data in formato ISO
 * @returns oggetto Date corrispondente
 */
export const parseTimestamp = (dateStr: string | undefined | null): Date => {
    if (!dateStr) return new Date();
    const date = new Date(dateStr);
    if (isNaN(date.getTime())) return new Date();
    return date;
};

export const parseSecondsToTime = (totalSeconds: number | null | undefined): string => {
    if (totalSeconds == null || isNaN(totalSeconds)) return '';

    const hours = Math.floor(totalSeconds / 3600);
    const minutes = Math.floor((totalSeconds % 3600) / 60);
    const seconds = totalSeconds % 60;

    const hh = String(hours);
    const mm = String(minutes).padStart(2, '0');
    const ss = String(seconds).padStart(2, '0');

    return `${hh}h`;
}