using Blacklight.Core;
using System;
using UnitTestSharp;

namespace Glass.Blacklight.UnitTests
{
    public class HostClipboardTests : TestFixture
    {
        public class FakeHostClipboard : IHostClipboard
        {
            public string Held { get; set; }

            public bool TryGetText(out string text)
            {
                text = Held;
                return Held != null;
            }

            public void SetText(string text)
            {
                Held = text;
            }
        }

        public class CtorTests : TestFixture
        {
            public void NullHost_Throws()
            {
                CheckThrow(typeof(ArgumentNullException));
                new HostClipboard(null);
            }
        }

        public class TryGetTextTests : TestFixture
        {
            public void ReturnsWhatTheHostHolds()
            {
                var clipboard = new HostClipboard(new FakeHostClipboard { Held = "abc" });

                Check(clipboard.TryGetText(out string text));
                CheckEqual("abc", text);
            }

            public void WithNothingOnTheHost_ReturnsFalse()
            {
                var clipboard = new HostClipboard(new FakeHostClipboard());

                CheckFalse(clipboard.TryGetText(out string text));
                CheckNull(text);
            }
        }

        public class SetTextTests : TestFixture
        {
            public void PutsTheTextOnTheHost()
            {
                var host = new FakeHostClipboard();

                new HostClipboard(host).SetText("abc");

                CheckEqual("abc", host.Held);
            }
        }
    }
}