using System.Collections.Generic;
using Microsoft.Extensions.Options;
using Moq;
using Ocelot.Library.Infrastructure.Configuration;
using Ocelot.Library.Infrastructure.Configuration.Yaml;
using Shouldly;
using TestStack.BDDfy;
using Xunit;

namespace Ocelot.UnitTests.Configuration
{
    public class OcelotConfigurationTests
    {
        private readonly Mock<IOptions<YamlConfiguration>> _yamlConfig;
        private OcelotConfiguration _config;
        private YamlConfiguration _yamlConfiguration;

        public OcelotConfigurationTests()
        {
            _yamlConfig = new Mock<IOptions<YamlConfiguration>>();
        }

        [Fact]
        public void should_create_template_pattern_that_matches_anything_to_end_of_string()
        {
            this.Given(x => x.GivenTheYamlConfigIs(new YamlConfiguration
            {
                ReRoutes = new List<YamlReRoute>
                {
                    new YamlReRoute
                    {
                        UpstreamTemplate = "/api/products/{productId}",
                        DownstreamTemplate = "/products/{productId}",
                        UpstreamHttpMethod = "Get"
                    }
                }
            }))
                .When(x => x.WhenIInstanciateTheOcelotConfig())
                .Then(x => x.ThenTheReRoutesAre(new List<ReRoute>
                {
                    new ReRoute("/products/{productId}","/api/products/{productId}", "Get", "/api/products/.*$", false)
                }))
                .BDDfy();
        }

        [Fact]
        public void should_create_template_pattern_that_matches_more_than_one_placeholder()
        {
            this.Given(x => x.GivenTheYamlConfigIs(new YamlConfiguration
            {
                ReRoutes = new List<YamlReRoute>
                {
                    new YamlReRoute
                    {
                        UpstreamTemplate = "/api/products/{productId}/variants/{variantId}",
                        DownstreamTemplate = "/products/{productId}",
                        UpstreamHttpMethod = "Get"
                    }
                }
            }))
                .When(x => x.WhenIInstanciateTheOcelotConfig())
                .Then(x => x.ThenTheReRoutesAre(new List<ReRoute>
                {
                    new ReRoute("/products/{productId}","/api/products/{productId}/variants/{variantId}", "Get", "/api/products/.*/variants/.*$", false)
                }))
                .BDDfy();
        }

        [Fact]
        public void should_create_template_pattern_that_matches_more_than_one_placeholder_with_trailing_slash()
        {
            this.Given(x => x.GivenTheYamlConfigIs(new YamlConfiguration
            {
                ReRoutes = new List<YamlReRoute>
                {
                    new YamlReRoute
                    {
                        UpstreamTemplate = "/api/products/{productId}/variants/{variantId}/",
                        DownstreamTemplate = "/products/{productId}",
                        UpstreamHttpMethod = "Get"
                    }
                }
            }))
                .When(x => x.WhenIInstanciateTheOcelotConfig())
                .Then(x => x.ThenTheReRoutesAre(new List<ReRoute>
                {
                    new ReRoute("/products/{productId}","/api/products/{productId}/variants/{variantId}/", "Get", "/api/products/.*/variants/.*/$", false)
                }))
                .BDDfy();
        }

        [Fact]
        public void should_create_template_pattern_that_matches_to_end_of_string()
        {
            this.Given(x => x.GivenTheYamlConfigIs(new YamlConfiguration
            {
                ReRoutes = new List<YamlReRoute>
                {
                    new YamlReRoute
                    {
                        UpstreamTemplate = "/",
                        DownstreamTemplate = "/api/products/",
                        UpstreamHttpMethod = "Get"
                    }
                }
            }))
                .When(x => x.WhenIInstanciateTheOcelotConfig())
                .Then(x => x.ThenTheReRoutesAre(new List<ReRoute>
                {
                    new ReRoute("/api/products/","/", "Get", "/$", false)
                }))
                .BDDfy();
        }

        private void GivenTheYamlConfigIs(YamlConfiguration yamlConfiguration)
        {
            _yamlConfiguration = yamlConfiguration;
            _yamlConfig
                .Setup(x => x.Value)
                .Returns(_yamlConfiguration);
        }

        private void WhenIInstanciateTheOcelotConfig()
        {
            _config = new OcelotConfiguration(_yamlConfig.Object);
        }

        private void ThenTheReRoutesAre(List<ReRoute> expectedReRoutes)
        {
            for (int i = 0; i < _config.ReRoutes.Count; i++)
            {
                var result = _config.ReRoutes[i];
                var expected = expectedReRoutes[i];

                result.DownstreamTemplate.ShouldBe(expected.DownstreamTemplate);
                result.UpstreamHttpMethod.ShouldBe(expected.UpstreamHttpMethod);
                result.UpstreamTemplate.ShouldBe(expected.UpstreamTemplate);
                result.UpstreamTemplatePattern.ShouldBe(expected.UpstreamTemplatePattern);
            }
        }
    }
}