using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc.Testing;
using Microsoft.Extensions.Logging;
using Moq;
using Nacos.V2;
using Nacos.V2.Common;
using Nacos.V2.Naming.Dtos;
using System.Net.Http;
using System.Net.Http.Json;
using System.Threading.Tasks;
using Xunit;

namespace Microservice.Common.Tests
{
    public class ServiceClientTests
    {
        private readonly Mock<INacosNamingService> _nacosNamingServiceMock;
        private readonly HttpClient _httpClient;
        private readonly Mock<ILogger<ServiceClient>> _loggerMock;
        private readonly ServiceClient _serviceClient;

        public ServiceClientTests()
        {
            // 初始化模拟对象
            _nacosNamingServiceMock = new Mock<INacosNamingService>();
            _loggerMock = new Mock<ILogger<ServiceClient>>();

            // 创建一个测试用的 HttpClient
            var httpClientHandler = new HttpClientHandler
            {
                ServerCertificateCustomValidationCallback = (sender, cert, chain, sslPolicyErrors) => true
            };
            _httpClient = new HttpClient(httpClientHandler);

            // 创建 ServiceClient 实例
            _serviceClient = new ServiceClient(_nacosNamingServiceMock.Object, _loggerMock.Object);
        }

        [Fact]
        public async Task GetAsync_ShouldReturnSuccess_WhenServiceIsAvailable()
        {
            // Arrange
            var serviceName = "TestService";
            var endpoint = "/api/test";
            var expectedResponse = new { Message = "Test Response" };

            // 模拟 Nacos 服务发现返回一个健康的实例
            var instance = new Instance
            {
                Ip = "127.0.0.1",
                Port = 8080,
                Healthy = true,
                Enabled = true
            };
            _nacosNamingServiceMock.Setup(x => x.SelectOneHealthyInstance(serviceName)).ReturnsAsync(instance);

            // 创建一个测试服务器
            var testServer = new TestServer(new WebApplicationFactory<object>().WithWebHostBuilder(builder =>
            {
                builder.ConfigureServices(services =>
                {
                    // 配置测试服务
                });
                builder.Configure(app =>
                {
                    app.MapGet("/api/test", () => Results.Ok(expectedResponse));
                });
            }));

            // 使用测试服务器的 HttpClient
            var testHttpClient = testServer.CreateClient();
            var testServiceClient = new ServiceClient(_nacosNamingServiceMock.Object, testHttpClient, _loggerMock.Object);

            // Act
            var result = await testServiceClient.GetAsync<object>(serviceName, endpoint);

            // Assert
            Assert.NotNull(result);
            Assert.Equal(expectedResponse.Message, ((dynamic)result).Message);
        }

        [Fact]
        public async Task GetAsync_ShouldThrowException_WhenServiceIsNotAvailable()
        {
            // Arrange
            var serviceName = "NonExistentService";
            var endpoint = "/api/test";

            // 模拟 Nacos 服务发现返回 null
            _nacosNamingServiceMock.Setup(x => x.SelectOneHealthyInstance(serviceName)).ReturnsAsync((Instance)null);

            // Act & Assert
            await Assert.ThrowsAsync<Exception>(() => _serviceClient.GetAsync<object>(serviceName, endpoint));
        }

        [Fact]
        public async Task GetAsync_ShouldHandleDifferentEndpointFormats()
        {
            // Arrange
            var serviceName = "TestService";
            var expectedResponse = new { Message = "Test Response" };

            // 模拟 Nacos 服务发现返回一个健康的实例
            var instance = new Instance
            {
                Ip = "127.0.0.1",
                Port = 8080,
                Healthy = true
            };
            _nacosNamingServiceMock.Setup(x => x.SelectOneHealthyInstance(serviceName)).ReturnsAsync(instance);

            // 创建测试服务器
            var testServer = new TestServer(new WebApplicationFactory<object>().WithWebHostBuilder(builder =>
            {
                builder.Configure(app =>
                {
                    app.Run(async context =>
                    {
                        // 验证请求路径是否以 '/' 开头
                        Assert.StartsWith("/", context.Request.Path);
                        await context.Response.WriteAsJsonAsync(new { StatusCode = 200, Message = "Success", Data = expectedResponse });
                    });
                });
            }));

            // 测试不同格式的端点
            var endpoints = new[] { "/api/test", "api/test", "test", "/test" };
            foreach (var endpoint in endpoints)
            {
                // Act & Assert
                var result = await _serviceClient.GetAsync<object>(serviceName, endpoint);
                Assert.NotNull(result);
            }
        }

        [Fact]
        public async Task PostAsync_ShouldReturnSuccess_WhenServiceIsAvailable()
        {
            // Arrange
            var serviceName = "TestService";
            var endpoint = "/api/test";
            var requestData = new { Name = "Test" };
            var expectedResponse = new { Message = "Test Response" };

            // 模拟 Nacos 服务发现返回一个健康的实例
            var instance = new Instance
            {
                Ip = "127.0.0.1",
                Port = 8080,
                Healthy = true,
                Enabled = true
            };
            _nacosNamingServiceMock.Setup(x => x.SelectOneHealthyInstance(serviceName)).ReturnsAsync(instance);

            // 创建一个测试服务器
            var testServer = new TestServer(new WebApplicationFactory<object>().WithWebHostBuilder(builder =>
            {
                builder.Configure(app =>
                {
                    app.MapPost("/api/test", (object data) => Results.Ok(expectedResponse));
                });
            }));

            // 使用测试服务器的 HttpClient
            var testHttpClient = testServer.CreateClient();
            var testServiceClient = new ServiceClient(_nacosNamingServiceMock.Object, testHttpClient, _loggerMock.Object);

            // Act
            var result = await testServiceClient.PostAsync<object>(serviceName, endpoint, requestData);

            // Assert
            Assert.NotNull(result);
            Assert.Equal(expectedResponse.Message, ((dynamic)result).Message);
        }

        [Fact]
        public async Task PutAsync_ShouldReturnSuccess_WhenServiceIsAvailable()
        {
            // Arrange
            var serviceName = "TestService";
            var endpoint = "/api/test";
            var requestData = new { Name = "Test" };
            var expectedResponse = new { Message = "Test Response" };

            // 模拟 Nacos 服务发现返回一个健康的实例
            var instance = new Instance
            {
                Ip = "127.0.0.1",
                Port = 8080,
                Healthy = true,
                Enabled = true
            };
            _nacosNamingServiceMock.Setup(x => x.SelectOneHealthyInstance(serviceName)).ReturnsAsync(instance);

            // 创建一个测试服务器
            var testServer = new TestServer(new WebApplicationFactory<object>().WithWebHostBuilder(builder =>
            {
                builder.Configure(app =>
                {
                    app.MapPut("/api/test", (object data) => Results.Ok(expectedResponse));
                });
            }));

            // 使用测试服务器的 HttpClient
            var testHttpClient = testServer.CreateClient();
            var testServiceClient = new ServiceClient(_nacosNamingServiceMock.Object, testHttpClient, _loggerMock.Object);

            // Act
            var result = await testServiceClient.PutAsync<object>(serviceName, endpoint, requestData);

            // Assert
            Assert.NotNull(result);
            Assert.Equal(expectedResponse.Message, ((dynamic)result).Message);
        }

        [Fact]
        public async Task DeleteAsync_ShouldReturnSuccess_WhenServiceIsAvailable()
        {
            // Arrange
            var serviceName = "TestService";
            var endpoint = "/api/test";
            var expectedResponse = new { Message = "Test Response" };

            // 模拟 Nacos 服务发现返回一个健康的实例
            var instance = new Instance
            {
                Ip = "127.0.0.1",
                Port = 8080,
                Healthy = true,
                Enabled = true
            };
            _nacosNamingServiceMock.Setup(x => x.SelectOneHealthyInstance(serviceName)).ReturnsAsync(instance);

            // 创建一个测试服务器
            var testServer = new TestServer(new WebApplicationFactory<object>().WithWebHostBuilder(builder =>
            {
                builder.Configure(app =>
                {
                    app.MapDelete("/api/test", () => Results.Ok(expectedResponse));
                });
            }));

            // 使用测试服务器的 HttpClient
            var testHttpClient = testServer.CreateClient();
            var testServiceClient = new ServiceClient(_nacosNamingServiceMock.Object, testHttpClient, _loggerMock.Object);

            // Act
            var result = await testServiceClient.DeleteAsync<object>(serviceName, endpoint);

            // Assert
            Assert.NotNull(result);
            Assert.Equal(expectedResponse.Message, ((dynamic)result).Message);
        }
    }
}