using Ocelot.Middleware;

namespace Ocelot.UnitTests.DownstreamUrlCreator
{
    using System;
    using System.Collections.Generic;
    using System.Net.Http;
    using Microsoft.AspNetCore.Builder;
    using Microsoft.Extensions.DependencyInjection;
    using Moq;
    using Ocelot.Configuration.Builder;
    using Ocelot.DownstreamRouteFinder;
    using Ocelot.DownstreamRouteFinder.UrlMatcher;
    using Ocelot.DownstreamUrlCreator;
    using Ocelot.DownstreamUrlCreator.Middleware;
    using Ocelot.DownstreamUrlCreator.UrlTemplateReplacer;
    using Ocelot.Infrastructure.RequestData;
    using Ocelot.Logging;
    using Ocelot.Responses;
    using Ocelot.Values;
    using TestStack.BDDfy;
    using Xunit;
    using Shouldly;
    using Ocelot.DownstreamRouteFinder.Middleware;
    using Microsoft.AspNetCore.Http;

    public class DownstreamUrlCreatorMiddlewareTests
    {
        private readonly Mock<IDownstreamPathPlaceholderReplacer> _downstreamUrlTemplateVariableReplacer;
        private readonly Mock<IUrlBuilder> _urlBuilder;
        private OkResponse<DownstreamPath> _downstreamPath;
        private Mock<IOcelotLoggerFactory> _loggerFactory;
        private Mock<IOcelotLogger> _logger;
        private DownstreamUrlCreatorMiddleware _middleware;
        private DownstreamContext _downstreamContext;
        private OcelotRequestDelegate _next;

        public DownstreamUrlCreatorMiddlewareTests()
        {
            _downstreamContext = new DownstreamContext(new DefaultHttpContext());
            _loggerFactory = new Mock<IOcelotLoggerFactory>();
            _logger = new Mock<IOcelotLogger>();
            _loggerFactory.Setup(x => x.CreateLogger<DownstreamUrlCreatorMiddleware>()).Returns(_logger.Object);
            _downstreamUrlTemplateVariableReplacer = new Mock<IDownstreamPathPlaceholderReplacer>();
            _urlBuilder = new Mock<IUrlBuilder>();
            _downstreamContext.DownstreamRequest = new HttpRequestMessage(HttpMethod.Get, "https://my.url/abc/?q=123");
            _next = async context => {
                //do nothing
            };
        }

        [Fact]
        public void should_replace_scheme_and_path()
        {
            var downstreamReRoute = new DownstreamReRouteBuilder()
                .WithDownstreamPathTemplate("any old string")
                .WithUpstreamHttpMethod(new List<string> {"Get"})
                .WithDownstreamScheme("https")
                .Build();

            this.Given(x => x.GivenTheDownStreamRouteIs(
                    new DownstreamRoute(
                    new List<PlaceholderNameAndValue>(), 
                    new ReRouteBuilder()
                        .WithDownstreamReRoute(downstreamReRoute)
                        .WithUpstreamHttpMethod(new List<string> { "Get" })
                        .Build())))
                .And(x => x.GivenTheDownstreamRequestUriIs("http://my.url/abc?q=123"))
                .And(x => x.GivenTheUrlReplacerWillReturn("/api/products/1"))
                .When(x => x.WhenICallTheMiddleware())
                .Then(x => x.ThenTheDownstreamRequestUriIs("https://my.url:80/api/products/1?q=123"))
                .BDDfy();
        }

        private void WhenICallTheMiddleware()
        {
            _middleware = new DownstreamUrlCreatorMiddleware(_next, _loggerFactory.Object, _downstreamUrlTemplateVariableReplacer.Object, _urlBuilder.Object);
            _middleware.Invoke(_downstreamContext).GetAwaiter().GetResult();
        }

        private void GivenTheDownStreamRouteIs(DownstreamRoute downstreamRoute)
        {
            _downstreamContext.TemplatePlaceholderNameAndValues = downstreamRoute.TemplatePlaceholderNameAndValues;
            _downstreamContext.DownstreamReRoute = downstreamRoute.ReRoute.DownstreamReRoute[0];
        }

        private void GivenTheDownstreamRequestUriIs(string uri)
        {
            _downstreamContext.DownstreamRequest.RequestUri = new Uri(uri);
        }

        private void GivenTheUrlReplacerWillReturn(string path)
        {
            _downstreamPath = new OkResponse<DownstreamPath>(new DownstreamPath(path));
            _downstreamUrlTemplateVariableReplacer
                .Setup(x => x.Replace(It.IsAny<PathTemplate>(), It.IsAny<List<PlaceholderNameAndValue>>()))
                .Returns(_downstreamPath);
        }

        private void ThenTheDownstreamRequestUriIs(string expectedUri)
        {
            _downstreamContext.DownstreamRequest.RequestUri.OriginalString.ShouldBe(expectedUri);
        }
    }
}