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using Microsoft.VisualStudio.TestTools.UnitTesting;
using Microsoft.Practices.Unity;
using ResolvingWithPolicyInjection.DemoClasses;

namespace ResolvingWithPolicyInjection.Tests
{
    [TestClass]
    public class UnityContainerExtensionMethodsTest
    {
        [TestMethod]
        public void should_resolve_ITestInterface_to_policy_enabled_TestConcreteImplementation_explicit()
        {
            // Arrange
            var container = new UnityContainer();
            container.RegisterType<ITestInterface, TestConcreteImplementation>();

            // Act 
            var resolvedWithPolicyInjection = container.ResolveWithPolicyInjection<ITestInterface>();

            // Assert
            Assert.IsNotNull(resolvedWithPolicyInjection);
            Assert.AreEqual("TEST", resolvedWithPolicyInjection.ReturnTest());
        }


        [TestMethod]
        public void should_resolve_ITestInterface_to_policy_enabled_TestConcreteImplementation_implicitly()
        {
            // Arrange
            var container = new UnityContainer();

            // Act 
            container.RegisterTypeWithPolicyInjection<ITestInterface, TestConcreteImplementation>();
            
            // Resolved the dependent class - which should do the resolving of ITestInterface to TestConcreteImplementation
            var resolved = container.Resolve<DependentConcreteImplementation>();

            // Assert
            Assert.IsNotNull(resolved);
            Assert.AreEqual("TEST", resolved.KörBeroende());
        }
    }
}


namespace ResolvingWithPolicyInjection.DemoClasses
{
    /// <summary>
    /// This class is dependent of ITestInterface
    /// </summary>
    public class DependentConcreteImplementation
    {
        private readonly ITestInterface _beroende;

        /// <summary>
        /// Constructor dependency - ITestInterface that will be resolved by Unity
        /// </summary>
        public DependentConcreteImplementation([Dependency]ITestInterface dependency)
        {
            _beroende = dependency;
        }

        public string KörBeroende()
        {
            return _beroende.ReturnTest();
        }
    }

    public interface ITestInterface
    {
        string ReturnTest();
    }

    /// <summary>
    /// This class implements ITestInterface
    /// </summary>
    public class TestConcreteImplementation : ITestInterface
    {

        public string ReturnTest()
        {
            return "TEST";
        }
    }
}