import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:prosappco/utils/time_of_day_extension.dart';
import 'package:prosappco/utils/time_of_day_utils.dart';

void main() {
  group('TimeOfDayExtension.add', () {
    test('carries minutes into hours', () {
      expect(const TimeOfDay(hour: 8, minute: 45).add(minute: 45),
          const TimeOfDay(hour: 9, minute: 30));
    });

    test('does not wrap past midnight, so range loops still terminate', () {
      expect(const TimeOfDay(hour: 23, minute: 30).add(minute: 45).hour, 24);
    });
  });

  group('TimeOfDayUtils.genRanges', () {
    // Regression: a minute-based step used to leave the hour untouched
    // ("8:90"), so isBefore() never became false and this looped forever,
    // freezing the calendar screen.
    test('minute-based step terminates and lands on real times', () {
      final slots = TimeOfDayUtils.genRanges(
        const TimeOfDay(hour: 8, minute: 0),
        const TimeOfDay(hour: 18, minute: 0),
        stepMinutes: 45,
      );

      expect(slots.length, 14);
      expect(slots.first, const TimeOfDay(hour: 8, minute: 0));
      expect(slots[1], const TimeOfDay(hour: 8, minute: 45));
      expect(slots[2], const TimeOfDay(hour: 9, minute: 30));
      expect(slots.last, const TimeOfDay(hour: 17, minute: 45));
      expect(slots.every((t) => t.minute < 60), isTrue);
    });

    test('two-hour step keeps the historical behaviour', () {
      final slots = TimeOfDayUtils.genRanges(
        const TimeOfDay(hour: 8, minute: 0),
        const TimeOfDay(hour: 18, minute: 0),
        stepMinutes: 120,
      );

      expect(slots.map((t) => t.hour).toList(), [8, 10, 12, 14, 16]);
    });

    test('end before start yields no slots', () {
      final slots = TimeOfDayUtils.genRanges(
        const TimeOfDay(hour: 18, minute: 0),
        const TimeOfDay(hour: 8, minute: 0),
        stepMinutes: 45,
      );

      expect(slots, isEmpty);
    });
  });
}