using System;
using UnitTestSharp;

namespace Susurrus.UnitTests
{
    public class BusTests : TestFixture
    {
        public class CtorTests : TestFixture
        {
            public void KeepsTheName()
            {
                CheckEqual("Effects", new Bus("Effects").Name);
            }

            public void StartsAtFullVolumeAndUnmuted()
            {
                Bus bus = new Bus("Effects");

                CheckEqual(1f, bus.Volume);
                CheckFalse(bus.IsMuted);
                CheckEqual(0, bus.Changes);
            }

            public void ANullName_Throws()
            {
                CheckThrow(typeof(ArgumentException));
                new Bus(null);
            }

            public void AnEmptyName_Throws()
            {
                CheckThrow(typeof(ArgumentException));
                new Bus("");
            }
        }

        public class VolumeTests : TestFixture
        {
            public void SettingIt_ChangesTheVolumeAndCountsAChange()
            {
                Bus bus = new Bus("Effects");

                bus.Volume = 0.25f;

                CheckEqual(0.25f, bus.Volume);
                CheckEqual(1, bus.Changes);
            }

            public void ANegativeVolume_ThrowsAndChangesNothing()
            {
                Bus bus = new Bus("Effects");

                try
                {
                    bus.Volume = -1f;
                    Check(false);
                }
                catch (ArgumentOutOfRangeException)
                {
                }

                CheckEqual(1f, bus.Volume);
                CheckEqual(0, bus.Changes);
            }
        }

        public class IsMutedTests : TestFixture
        {
            public void SettingIt_CountsAChangeAndKeepsTheVolume()
            {
                Bus bus = new Bus("Effects");
                bus.Volume = 0.5f;

                bus.IsMuted = true;

                CheckTrue(bus.IsMuted);
                CheckEqual(0.5f, bus.Volume);
                CheckEqual(2, bus.Changes);
            }
        }

        public class IsPausedTests : TestFixture
        {
            public void ByDefault_IsFalse()
            {
                CheckFalse(new Bus("Effects").IsPaused);
            }

            public void SettingIt_CountsAChangeAndKeepsTheVolumeAndTheMute()
            {
                Bus bus = new Bus("Effects");
                bus.Volume = 0.5f;

                bus.IsPaused = true;

                CheckTrue(bus.IsPaused);
                CheckEqual(0.5f, bus.Gain);
                CheckEqual(2, bus.Changes);
            }

            public void ClearingIt_CountsAnotherChange()
            {
                Bus bus = new Bus("Effects");
                bus.IsPaused = true;

                bus.IsPaused = false;

                CheckFalse(bus.IsPaused);
                CheckEqual(2, bus.Changes);
            }
        }

        public class GainTests : TestFixture
        {
            public void IsTheVolumeWhileUnmuted()
            {
                Bus bus = new Bus("Effects");
                bus.Volume = 0.5f;

                CheckEqual(0.5f, bus.Gain);
            }

            public void IsZeroWhileMuted()
            {
                Bus bus = new Bus("Effects");
                bus.Volume = 0.5f;
                bus.IsMuted = true;

                CheckEqual(0f, bus.Gain);
            }

            public void ReturnsToTheVolumeOnceUnmuted()
            {
                Bus bus = new Bus("Effects");
                bus.Volume = 0.5f;
                bus.IsMuted = true;
                bus.IsMuted = false;

                CheckEqual(0.5f, bus.Gain);
            }
        }
    }
}