tm_app/lib/core/utils/date_utils.dart

import 'package:intl/intl.dart';

class DateUtils {
  /// Converts Unix timestamp (seconds since epoch) to a formatted date string
  static String unixToDate(int? unixTimestamp, {String format = 'yyyy-MM-dd'}) {
    if (unixTimestamp == null) {
      return '';
    }

    // Convert seconds to milliseconds if needed
    int timestampInMs =
        unixTimestamp > 1000000000000 ? unixTimestamp : unixTimestamp * 1000;

    final DateTime dateTime = DateTime.fromMillisecondsSinceEpoch(
      timestampInMs,
    );
    return DateFormat(format).format(dateTime);
  }

  /// Converts Unix timestamp to a readable date string
  static String unixToReadableDate(int? unixTimestamp) {
    if (unixTimestamp == null) {
      return '';
    }

    int timestampInMs =
        unixTimestamp > 1000000000000 ? unixTimestamp : unixTimestamp * 1000;

    final DateTime dateTime = DateTime.fromMillisecondsSinceEpoch(
      timestampInMs,
    );
    final DateTime now = DateTime.now();
    final Duration difference = now.difference(dateTime);

    if (difference.inDays == 0) {
      return 'Today';
    } else if (difference.inDays == 1) {
      return 'Yesterday';
    } else if (difference.inDays < 7) {
      return '${difference.inDays} days ago';
    } else {
      return DateFormat('MMM dd, yyyy').format(dateTime);
    }
  }

  /// Converts Unix timestamp to a short date format
  static String unixToShortDate(int? unixTimestamp) {
    if (unixTimestamp == null) {
      return '';
    }

    int timestampInMs =
        unixTimestamp > 1000000000000 ? unixTimestamp : unixTimestamp * 1000;

    final DateTime dateTime = DateTime.fromMillisecondsSinceEpoch(
      timestampInMs,
    );
    return DateFormat('MMM dd').format(dateTime);
  }

  /// Converts Unix timestamp to a full date and time format
  static String unixToDateTime(int? unixTimestamp) {
    if (unixTimestamp == null) {
      return '';
    }

    int timestampInMs =
        unixTimestamp > 1000000000000 ? unixTimestamp : unixTimestamp * 1000;

    final DateTime dateTime = DateTime.fromMillisecondsSinceEpoch(
      timestampInMs,
    );
    return DateFormat('MMM dd, yyyy HH:mm').format(dateTime);
  }

  /// Checks if a Unix timestamp is in the past
  static bool isPast(int? unixTimestamp) {
    if (unixTimestamp == null) {
      return false;
    }

    int timestampInMs =
        unixTimestamp > 1000000000000 ? unixTimestamp : unixTimestamp * 1000;

    final DateTime dateTime = DateTime.fromMillisecondsSinceEpoch(
      timestampInMs,
    );
    return dateTime.isBefore(DateTime.now());
  }

  /// Gets the number of days remaining until a Unix timestamp
  static int daysRemaining(int? unixTimestamp) {
    if (unixTimestamp == null) {
      return 0;
    }

    int timestampInMs =
        unixTimestamp > 1000000000000 ? unixTimestamp : unixTimestamp * 1000;

    final DateTime dateTime = DateTime.fromMillisecondsSinceEpoch(
      timestampInMs,
    );
    final DateTime now = DateTime.now();
    final Duration difference = dateTime.difference(now);

    return difference.inDays;
  }
}