using System;
using Upsilon.BaseTypes.UserData;
using Upsilon.Evaluator;
using Xunit;
// ReSharper disable UnusedMember.Local

namespace UpsilonTests
{
    public class UserDataTests : IClassFixture<UserDataTests.UserDataTestsFixture>
    {
        public class UserDataTestsFixture : IDisposable
        {
            public UserDataTestsFixture()
            {
                UserDataTypeHandler.LoadType<UserDataHelper>();
            }

            public void Dispose()
            {
            }
        }

        #pragma warning disable 414, 649
        private class UserDataHelper
        {
            public string FieldString = "TestField";
            public string FieldStringSet;

            public bool TestMethodHasRun { get; private set; }
            public void TestMethod()
            {
                TestMethodHasRun = true;
            }

            public long Add(long a, long b)
            {
                return a + b;
            }

        }
        #pragma warning restore 414, 649


        [Fact]
        public void AccessFieldsGet()
        {
            var obj = new UserDataHelper();
            const string input = @"
function test(o)
    return o[""FieldString""]
end
";
            var script = new Script(input);
            Assert.Empty(script.Diagnostics.Messages);
            var result = script.EvaluateFunction<string>("test", new[] {obj});
            Assert.Empty(script.Diagnostics.Messages);
            Assert.Equal("TestField", result);
        }

        [Fact]
        public void AccessFieldsSet()
        {
            var obj = new UserDataHelper();
            const string input = @"
function test(o)
    o[""FieldStringSet""] = ""Test""
end
";
            var script = new Script(input);
            Assert.Empty(script.Diagnostics.Messages);
            script.EvaluateFunction("test", new[] {obj});
            Assert.Empty(script.Diagnostics.Messages);
            Assert.Equal("Test", obj.FieldStringSet);
        }

        [Fact]
        public void RunVoidMethod()
        {
            var obj = new UserDataHelper();
            const string input = @"
function test(o)
    o[""TestMethod""]()
end
";
            var script = new Script(input);
            Assert.Empty(script.Diagnostics.Messages);
            script.EvaluateFunction("test", new[] {obj});
            Assert.Empty(script.Diagnostics.Messages);
            Assert.True(obj.TestMethodHasRun);
        }

        [Fact]
        public void ReturnMethodWithParameters()
        {
            var obj = new UserDataHelper();
            const string input = @"
function test(o)
    return o[""Add""](100, 20)
end
";
            var script = new Script(input);
            Assert.Empty(script.Diagnostics.Messages);
            var result = script.EvaluateFunction<long>("test", new[] {obj});
            Assert.Empty(script.Diagnostics.Messages);
            Assert.Equal(result, 120);
        }
    }
}