using System;
using UnitTestSharp;

namespace Susurrus.UnitTests
{
    public class VoiceTests : TestFixture
    {
        public class CtorTests : TestFixture
        {
            public void KeepsTheSlotAndGeneration()
            {
                Voice voice = new Voice(slot: 3, generation: 7);

                CheckEqual(3, voice.Slot);
                CheckEqual(7, voice.Generation);
            }

            public void NegativeSlot_Throws()
            {
                CheckThrow(typeof(ArgumentOutOfRangeException));
                new Voice(slot: -1, generation: 1);
            }

            public void ZeroGeneration_Throws()
            {
                CheckThrow(typeof(ArgumentOutOfRangeException));
                new Voice(slot: 0, generation: 0);
            }

            public void NegativeGeneration_Throws()
            {
                CheckThrow(typeof(ArgumentOutOfRangeException));
                new Voice(slot: 0, generation: -1);
            }
        }

        public class NoneTests : TestFixture
        {
            public void IsTheDefaultVoice()
            {
                CheckEqual(default(Voice), Voice.None);
            }
        }

        public class IsNoneTests : TestFixture
        {
            public void None_IsNone()
            {
                CheckTrue(Voice.None.IsNone);
            }

            public void AStartedVoice_IsNotNone()
            {
                CheckFalse(new Voice(slot: 0, generation: 1).IsNone);
            }
        }

        public class ToStringTests : TestFixture
        {
            public void NamesTheSlotAndGeneration()
            {
                CheckEqual("Voice(slot 3, generation 7)", new Voice(3, 7).ToString());
            }

            public void NamesNone()
            {
                CheckEqual("Voice.None", Voice.None.ToString());
            }
        }

        public class EqualityTests : TestFixture
        {
            public void SameSlotAndGeneration_AreEqual()
            {
                CheckTrue(new Voice(3, 7) == new Voice(3, 7));
                CheckFalse(new Voice(3, 7) != new Voice(3, 7));
                CheckTrue(new Voice(3, 7).Equals((object)new Voice(3, 7)));
                CheckEqual(new Voice(3, 7).GetHashCode(), new Voice(3, 7).GetHashCode());
            }

            public void ADifferentSlot_IsNotEqual()
            {
                CheckFalse(new Voice(3, 7) == new Voice(4, 7));
                CheckTrue(new Voice(3, 7) != new Voice(4, 7));
            }

            public void ADifferentGeneration_IsNotEqual()
            {
                CheckFalse(new Voice(3, 7) == new Voice(3, 8));
                CheckTrue(new Voice(3, 7) != new Voice(3, 8));
            }

            public void ANonVoice_IsNotEqual()
            {
                CheckFalse(new Voice(3, 7).Equals("a voice"));
            }
        }
    }
}