using Azimuth;
using Blacklight.Core.Cameras;

namespace Blacklight.Core.UnitTests.Cameras
{
    public class LockedPointerTests : UnitTestSharp.TestFixture
    {
        public static readonly Vector GrabPoint = new Vector(40, 30);

        public static LockedPointer LockedAtTheGrabPoint()
        {
            var pointer = new LockedPointer();
            pointer.Lock(GrabPoint);
            return pointer;
        }

        public class CtorTests : UnitTestSharp.TestFixture
        {
            public void StartsUnlocked()
            {
                CheckFalse(new LockedPointer().Locked);
            }
        }

        public class LockTests : UnitTestSharp.TestFixture
        {
            public void Always_Locks()
            {
                CheckTrue(LockedAtTheGrabPoint().Locked);
            }

            public void Always_StartsThePositionAtTheHostsPosition()
            {
                CheckEqual(GrabPoint, LockedAtTheGrabPoint().Position);
            }

            public void Always_RemembersWhereTheLockBegan()
            {
                LockedPointer pointer = LockedAtTheGrabPoint();

                pointer.Move(new Vector(5, 5));

                CheckEqual(GrabPoint, pointer.LockedAt);
            }
        }

        public class MoveTests : UnitTestSharp.TestFixture
        {
            public void WhileLocked_AddsUpPastAnyEdge()
            {
                LockedPointer pointer = LockedAtTheGrabPoint();

                pointer.Move(new Vector(-100, 0));
                pointer.Move(new Vector(-100, -50));

                CheckEqual(new Vector(-160, -20), pointer.Position);
            }

            public void AfterUnlock_IsIgnored()
            {
                LockedPointer pointer = LockedAtTheGrabPoint();
                pointer.Unlock();

                pointer.Move(new Vector(5, 5));

                CheckEqual(GrabPoint, pointer.Position);
            }
        }

        public class UnlockTests : UnitTestSharp.TestFixture
        {
            public void Always_Unlocks()
            {
                LockedPointer pointer = LockedAtTheGrabPoint();

                pointer.Unlock();

                CheckFalse(pointer.Locked);
            }
        }

        public class PositionForTests : UnitTestSharp.TestFixture
        {
            public void Unlocked_IsTheHostsPosition()
            {
                CheckEqual(new Vector(7, 8), new LockedPointer().PositionFor(new Vector(7, 8)));
            }

            public void Locked_IsTheBuiltUpPositionWhateverTheHostSays()
            {
                LockedPointer pointer = LockedAtTheGrabPoint();
                pointer.Move(new Vector(5, 0));

                CheckEqual(new Vector(45, 30), pointer.PositionFor(new Vector(7, 8)));
            }
        }
    }
}