using QuestionsApi.Services;
using Xunit;

namespace QuestionsApi.Tests;

public sealed class DashboardTests
{
    [Fact]
    public void PercentageRoundsToNearestWholeNumber()
    {
        Assert.Equal(67, DashboardStore.Percentage(2, 3));
        Assert.Equal(0, DashboardStore.Percentage(0, 0));
    }

    [Fact]
    public void StreakIncludesYesterdayWhenUserHasNotStudiedToday()
    {
        var today = new DateTime(2026, 7, 18, 0, 0, 0, DateTimeKind.Utc);
        var dates = new[] { today.AddDays(-1), today.AddDays(-2), today.AddDays(-3), today.AddDays(-5) };
        Assert.Equal(3, DashboardStore.CalculateCurrentStreak(dates, today));
    }

    [Fact]
    public void StreakStopsAtFirstMissingDay()
    {
        var today = new DateTime(2026, 7, 18, 0, 0, 0, DateTimeKind.Utc);
        var dates = new[] { today, today.AddDays(-1), today.AddDays(-3) };
        Assert.Equal(2, DashboardStore.CalculateCurrentStreak(dates, today));
    }
}