using Microsoft.VisualStudio.TestTools.UnitTesting;
using Moq;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using System.Web;
using System.Web.Routing;

namespace UrlsAndRoutes.Tests
{
    [TestClass]
    public class RouteTests
    {
        private HttpContextBase CreateHttpContext(string targetUrl = null, string httpMethod = "GET")
        {
            // create the mock request
            Mock<HttpRequestBase> mockRequet = new Mock<HttpRequestBase>();
            mockRequet.Setup(m => m.AppRelativeCurrentExecutionFilePath).Returns(targetUrl);
            mockRequet.Setup(m => m.HttpMethod).Returns(httpMethod);

            // create the mock response
            Mock<HttpResponseBase> mockResponse = new Mock<HttpResponseBase>();
            mockResponse.Setup(m => m.ApplyAppPathModifier(It.IsAny<string>())).Returns<string>(s => s);

            // create the mock context, using the request and response
            Mock<HttpContextBase> mockContext = new Mock<HttpContextBase>();
            mockContext.Setup(m => m.Request).Returns(mockRequet.Object);
            mockContext.Setup(m => m.Response).Returns(mockResponse.Object);
            // return the mocked context
            return mockContext.Object;
        }

        private void TestRouteMatch(
            string url, 
            string controller, 
            string action, 
            object routeProperties = null,
            string httpMethod = "GET")
        {
            // Arrange
            RouteCollection routes = new RouteCollection();
            RouteConfig.RegisterRoutes(routes);

            // Act - process the route
            RouteData result = routes.GetRouteData(CreateHttpContext(url, httpMethod));

            // Assert
            Assert.IsNotNull(result);
            Assert.IsTrue(TestIncomingRouteResult(result, controller, action, routeProperties));
        }

        private bool TestIncomingRouteResult(
            RouteData routeResult,
            string controller,
            string action,
            object propertySet = null)
        {
            Func<object, object, bool> valCompare = (v1, v2) =>
            {
                return StringComparer.InvariantCultureIgnoreCase.Compare(v1, v2) == 0;
            };

            bool result = valCompare(routeResult.Values["controller"], controller) &&
                valCompare(routeResult.Values["action"], action);

            if (propertySet != null)
            {
                PropertyInfo[] propInfo = propertySet.GetType().GetProperties();
                foreach (PropertyInfo pi in propInfo)
                {
                    if (!(routeResult.Values.ContainsKey(pi.Name) 
                        && valCompare(routeResult.Values[pi.Name],pi.GetValue(propertySet, null))))
                    {
                        result = false;
                        break;
                    }
                }
            }

            return result;
        }

        private void TestRouteFail(string url)
        {
            // Arrange
            RouteCollection routes = new RouteCollection();
            RouteConfig.RegisterRoutes(routes);

            // Act - process the route
            RouteData result = routes.GetRouteData(CreateHttpContext(url));

            // Assert
            Assert.IsTrue(result == null || result.Route == null);
        }

        [TestMethod]
        public void TestIncomingRoutes()
        {
            TestRouteMatch("~/", "Home", "Index");
            TestRouteMatch("~/Customer", "Customer", "Index");
            TestRouteMatch("~/Customer/List", "Customer", "List");
            TestRouteFail("~/Customer/List/All");
            TestRouteMatch("~/Shop/Index", "Home", "Index");
        }
    }
}