using MeetTheTeacher.Model;
using MeetTheTeacher.Model.Comparison;

namespace MeetTheTeacher.Test.Model.Comparison;

public sealed class ByNameComparerTests
{
    [Fact]
    public void Compare_Ascending_BothNull()
    {
        var comparer = new ByNameComparer(true);
        comparer.Compare(null, null).Should().Be(0);
    }

    [Fact]
    public void Compare_Ascending_FirstNull()
    {
        var teacher2 = new Teacher("Teacher2");
        var comparer = new ByNameComparer(true);
        
        comparer.Compare(null, teacher2).Should().Be(1);
    }

    [Fact]
    public void Compare_Ascending_SecondNull()
    {
        var teacher1 = new Teacher("Teacher1");
        var comparer = new ByNameComparer(true);
        
        comparer.Compare(teacher1, null).Should().Be(-1);
    }

    [Fact]
    public void Compare_Ascending_DifferentNames()
    {
        var teacher1 = new Teacher("Teacher1");
        var teacher2 = new Teacher("Teacher2");
        var comparer = new ByNameComparer(true);
        
        comparer.Compare(teacher1, teacher2).Should().Be(-1);
    }

    [Fact]
    public void Compare_Descending_FirstNull()
    {
        var teacher2 = new Teacher("Teacher2");
        var comparer = new ByNameComparer(false);
        
        comparer.Compare(null, teacher2).Should().Be(-1);
    }

    [Fact]
    public void Compare_Descending_SecondNull()
    {
        var teacher1 = new Teacher("Teacher1");
        var comparer = new ByNameComparer(false);
        
        comparer.Compare(teacher1, null).Should().Be(1);
    }

    [Fact]
    public void Compare_Descending_DifferentNames()
    {
        var teacher1 = new Teacher("Teacher1");
        var teacher2 = new Teacher("Teacher2");
        var comparer = new ByNameComparer(false);
        
        comparer.Compare(teacher1, teacher2).Should().Be(1);
    }
}