import 'package:flutter/material.dart';

extension TimeOfDayExtension on TimeOfDay {
  /// Adds the given offset, carrying minutes into hours.
  ///
  /// Without the carry, adding a minute-based step (e.g. 45) would leave the
  /// hour untouched and produce values like "8:90", which makes [isBefore]
  /// loops run forever. The hour is intentionally NOT wrapped at 24 so that
  /// comparisons against an end-of-day bound still terminate.
  TimeOfDay add({int hour = 0, int minute = 0}) {
    final totalMinutes = (this.hour + hour) * 60 + this.minute + minute;
    return TimeOfDay(hour: totalMinutes ~/ 60, minute: totalMinutes % 60);
  }

  int compareTo(TimeOfDay other) {
    if (hour < other.hour) return -1;
    if (hour > other.hour) return 1;
    if (minute < other.minute) return -1;
    if (minute > other.minute) return 1;
    return 0;
  }

  bool isBefore(TimeOfDay other) {
    return compareTo(other) == -1;
  }
}