// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.

namespace System.Data.Entity.TestHelpers
{
    using System.Collections.Generic;
    using System.Reflection;
    using System.Xml;
    using Xunit;
    using Xunit.Sdk;

    internal class PartialTrustCommand : ITestCommand
    {
        private readonly ITestCommand _command;
        private readonly IDictionary<MethodInfo, object> _fixtures;

        public PartialTrustCommand(ITestCommand command, IDictionary<MethodInfo, object> fixtures = null)
        {
            _command = command;
            _fixtures = fixtures;
        }

        public string DisplayName
        {
            get { return _command.DisplayName; }
        }

        public bool ShouldCreateInstance
        {
            get { return _command.ShouldCreateInstance; }
        }

        public int Timeout
        {
            get { return _command.Timeout; }
        }

        public MethodResult Execute(object testClass)
        {
            object sandboxedClass = null;

            try
            {
                if (testClass != null)
                {
                    var testClassType = testClass.GetType();

                    if (!typeof(MarshalByRefObject).IsAssignableFrom(testClassType))
                    {
                        throw new InvalidOperationException(
                            string.Format(
                                "In order to use the partial trust attributes here, '{0}' must derive from MarshalByRefObject.",
                                testClassType.FullName));
                    }

                    sandboxedClass = PartialTrustSandbox.Default.CreateInstance(testClassType);
                    ApplyFixtures(sandboxedClass);
                }
                else
                {
                    Assert.IsType<SkipCommand>(_command);
                }

                return _command.Execute(sandboxedClass);
            }
            finally
            {
                var asDisposable = sandboxedClass as IDisposable;
                if (asDisposable != null)
                {
                    asDisposable.Dispose();
                }
            }
        }

        public XmlNode ToStartXml()
        {
            return _command.ToStartXml();
        }

        private void ApplyFixtures(object testClass)
        {
            if (_fixtures == null)
            {
                return;
            }

            foreach (var fixture in _fixtures)
            {
                fixture.Key.Invoke(testClass, new[] { fixture.Value });
            }
        }
    }
}