using Consul;
using Furion;
using Furion.DatabaseAccessor;
using Furion.DataEncryption;
using Furion.DistributedIDGenerator;
using Furion.DynamicApiController;
using Furion.FriendlyException;
using Furion.HttpRemote;
using Mapster;
using MediatR;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.ActionConstraints;
using Microsoft.AspNetCore.Mvc.Controllers;
using Microsoft.AspNetCore.Routing;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Linq;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Reflection;
using System.Resources;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading;
using System.Threading.Tasks;
using static System.Collections.Specialized.BitVector32;

namespace FlexJobApi.Core
{
    /// <summary>
    /// 资源工具
    /// </summary>
    public static class ResourceUtils
    {
        /// <summary>
        /// 发送HTTP请求
        /// </summary>
        /// <typeparam name="TRequest"></typeparam>
        /// <typeparam name="TResponse"></typeparam>
        /// <param name="request"></param>
        /// <returns></returns>
        public static async Task<TResponse> SendHttpAsync<TRequest, TResponse>(TRequest request)
            where TRequest : class, new()
        {
            var requestTypeFullName = typeof(TRequest).FullName;
            var resource = await Db.GetRepository<Resource>().AsQueryable().AsNoTracking()
                .Where(it => !it.IsExpired && it.RequestTypeFullName == requestTypeFullName)
                .FirstOrDefaultAsync();
            var domain = await GetHealthyServiceDomain(resource);
            var httpRemoteService = App.GetRequiredService<IHttpRemoteService>();
            var token = App.HttpContext.Request.Headers["Authorization"].ToString();
            var refreshToken = App.HttpContext.Request.Headers["X-Authorization"].ToString();
            TResponse response;
            switch (resource.Method)
            {
                case EnumResourceMethod.Get:
                    response = await httpRemoteService.GetAsAsync<TResponse>(
                        $"{domain}{resource.Route}",
                        it =>
                            it.WithQueryParameters(request)
                            .AddAuthentication(new AuthenticationHeaderValue("Authorization", token))
                            .AddAuthentication(new AuthenticationHeaderValue("X-Authorization", refreshToken)));
                    break;
                case EnumResourceMethod.Post:
                    response = await httpRemoteService.PostAsAsync<TResponse>(
                        $"{domain}{resource.Route}",
                        it =>
                            it.SetJsonContent(request)
                            .WithHeader("Authorization", token)
                            .WithHeader("X-Authorization", refreshToken));
                    break;
                case EnumResourceMethod.Put:
                    response = await httpRemoteService.PutAsAsync<TResponse>(
                        $"{domain}{resource.Route}",
                        it =>
                            it.SetJsonContent(request)
                            .AddAuthentication(new AuthenticationHeaderValue("Authorization", token))
                            .AddAuthentication(new AuthenticationHeaderValue("X-Authorization", refreshToken)));
                    break;
                case EnumResourceMethod.Delete:
                    response = await httpRemoteService.DeleteAsAsync<TResponse>(
                        $"{domain}{resource.Route}",
                        it =>
                            it.SetJsonContent(request)
                            .AddAuthentication(new AuthenticationHeaderValue("Authorization", token))
                            .AddAuthentication(new AuthenticationHeaderValue("X-Authorization", refreshToken)));
                    break;
                default:
                    throw Oops.Oh(EnumErrorCodeType.s400, $"不支持请求方式{resource.Method}");
            }
            return response;
        }

        /// <summary>
        /// 获取健康服务域名
        /// </summary>
        /// <param name="resource"></param>
        /// <returns></returns>
        public static async Task<string> GetHealthyServiceDomain(Resource resource)
        {
            var client = App.GetRequiredService<IConsulClient>();
            var queryResult = await client.Health.Service(resource.ServiceName, null, true);
            if (queryResult.StatusCode != System.Net.HttpStatusCode.OK)
                throw Oops.Oh(EnumErrorCodeType.s404, $"微服务{resource.Service}");

            var domains = queryResult.Response
                .Select(s => $"http://{s.Service.Address}:{s.Service.Port}")
                .ToList();
            if (domains.IsNull())
                throw Oops.Oh(EnumErrorCodeType.s404, $"微服务{resource.Service}");
            // 轮询选择实例
            int randomIndex = new Random().Next(domains.Count);
            return domains[randomIndex];
        }

        /// <summary>
        /// 生成动态控制器
        /// </summary>
        public static async Task BuildDynamicControllersAsync()
        {
            var traceId = App.GetTraceId() ?? IDGen.NextID().ToString();
            var scopeFactory = App.GetService<IServiceScopeFactory>();
            var serviceScope = scopeFactory.CreateScope();
            var provider = serviceScope.ServiceProvider.GetRequiredService<IDynamicApiRuntimeChangeProvider>();
            var rep = serviceScope.ServiceProvider.GetRequiredService<IRepository<Resource>>();
            var xmlDoc = await XmlDocUtils.GetXmlDocAsync();
            var enumWebApiMethods = await EnumUtils.GetModel<EnumResourceMethod>();
            var resourceControllers = await EnumUtils.GetModel<EnumResourceController>();
            var requests = App.Assemblies
                .SelectMany(it => it.GetTypes())
                .Where(it => !it.IsAbstract && typeof(IBaseRequest).IsAssignableFrom(it))
                .ToList();
            var models = new List<ResourceModel>();
            foreach (var request in requests)
            {
                var resourceAttribute = request.GetCustomAttribute<ResourceAttribute>();
                if (resourceAttribute == null) throw Oops.Oh(EnumErrorCodeType.s404, $"请给资源{request.Name}分配服务特性Resource");

                foreach (var controller in resourceAttribute.Controllers)
                {
                    var requestXmlDoc = await request.GetXmlDocMemberAsync(xmlDoc);
                    var resourceController = controller.GetCustomAttribute<EnumResourceController, ResourceControllerAttribute>();
                    var resourceService = resourceController.Service.GetCustomAttribute<EnumResourceService, ResourceServiceAttribute>();

                    var model = new ResourceModel();
                    model.TraceId = traceId;
                    model.ApplicationName = resourceService.ApplicationName;
                    model.Controller = controller;
                    model.ControllerSummary = resourceControllers.GetDescription(controller);
                    model.ActionName = Regex.Replace(request.Name, @"(Command|Query)$", "", RegexOptions.None);
                    model.ActionSummary = requestXmlDoc?.Summary;
                    model.Service = resourceController.Service;
                    model.ServiceName = resourceService.ServiceName;
                    model.RouteArea = resourceService.RouteArea;
                    model.Route = $"/api/{resourceService.RouteArea ?? "main"}/{controller}/{model.ActionName}";
                    model.Method =
                        request.BaseType?.IsGenericType == true && request.BaseType.GetGenericTypeDefinition() == typeof(PagedListQuery<,>)
                        ? EnumResourceMethod.Post
                        : new List<string> { "Post", "Add", "Create", "Insert", "Submit" }.Any(it => request.Name.StartsWith(it, StringComparison.OrdinalIgnoreCase))
                        ? EnumResourceMethod.Post
                        : new List<string> { "GetAll", "GetList", "Get", "Find", "Fetch", "Query" }.Any(it => request.Name.StartsWith(it, StringComparison.OrdinalIgnoreCase))
                        ? EnumResourceMethod.Get
                        : new List<string> { "Put", "Update ", "Set" }.Any(it => request.Name.StartsWith(it, StringComparison.OrdinalIgnoreCase))
                        ? EnumResourceMethod.Put
                        : new List<string> { "Delete", "Remove ", "Clear" }.Any(it => request.Name.StartsWith(it, StringComparison.OrdinalIgnoreCase))
                        ? EnumResourceMethod.Delete
                        : EnumResourceMethod.Post;
                    model.Code = requestXmlDoc?.Name;
                    model.Name = $"{model.ControllerSummary}-{model.ActionSummary}";
                    model.AllowAnonymous = resourceAttribute.AllowAnonymous;
                    model.RequestTypeName = request.Name;
                    model.RequestTypeFullName = request.FullName;
                    var iRequestType = request.GetInterface("IRequest`1");
                    if (iRequestType != null && iRequestType.IsGenericType)
                    {
                        var responseType = iRequestType.GenericTypeArguments[0];
                        model.ResponseTypeName = responseType.GetCSharpFriendlyName();
                        model.ResponseTypeFullName = responseType.FullName;
                    }


                    models.Add(model);
                }
            }

            var resources = await SaveResourcesAsync(models, rep);

            DynamicControllersHotPlug(resources, provider);

            await rep.SaveNowAsync();
        }

        /// <summary>
        /// 保存资源
        /// </summary>
        /// <param name="models"></param>
        /// <param name="traceId"></param>
        /// <param name="rep"></param>
        /// <returns></returns>
        private static async Task<List<Resource>> SaveResourcesAsync(List<ResourceModel> models, IRepository<Resource> rep = null)
        {
            rep = rep ?? Db.GetRepository<Resource>();
            var resources = await rep.AsQueryable()
                .Where(it => !it.IsExpired)
                .ToListAsync();
            foreach (var model in models)
            {
                var resource = resources.FirstOrDefault(it => it.Route == model.Route && it.Method == model.Method);
                if (resource == null)
                {
                    resource = new Resource();
                    resource.Id = IDGen.NextID();
                    resource.CreatedTime = DateTimeOffset.Now;
                    model.Adapt(resource);
                    await rep.InsertAsync(resource);
                    resources.Add(resource);
                }
                else
                {
                    var resourceBakModel = new ResourceModel();
                    resource.Adapt(resourceBakModel);
                    resourceBakModel.TraceId = model.TraceId;
                    resourceBakModel.DynamicAssemblyName = model.DynamicAssemblyName;
                    if (resourceBakModel.ToJson() != model.ToJson())
                    {
                        model.Adapt(resource);
                        resource.UpdatedTime = DateTimeOffset.Now;
                        await rep.UpdateAsync(resource);
                    }
                }
            }

            var expiredResources = resources.Where(it => !models.Any(m => m.Route == it.Route && m.Method == it.Method)).ToList();
            foreach (var expiredResource in expiredResources)
            {
                //expiredResource.IsExpired = true;
                //await rep.UpdateAsync(expiredResource);
                await rep.DeleteAsync(expiredResource);
            }

            return resources.Where(it => !it.IsExpired).ToList();
        }

        /// <summary>
        /// 动态控制器热插
        /// </summary>
        /// <param name="resources"></param>
        /// <param name="provider"></param>
        public static void DynamicControllersHotPlug(List<Resource> resources, IDynamicApiRuntimeChangeProvider provider = null)
        {
            provider = provider ?? App.GetRequiredService<IDynamicApiRuntimeChangeProvider>();
            foreach (var resource in resources)
            {
                var code = $@"
using FlexJobApi.Core;
using Furion.DynamicApiController;
using Furion.FriendlyException;
using MediatR;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using System;
using System.Threading.Tasks;
using System.Collections.Generic;
using System.ComponentModel;

namespace {resource.ApplicationName}.{resource.Controller}.{resource.ActionName}Request
{{
    /// <summary>
    /// {resource.ControllerSummary}
    /// </summary>
    [Route(""api/{resource.RouteArea}/[controller]"")]
    public class {resource.Controller}AppService(IMediator mediator) : IDynamicApiController
    {{
        private readonly IMediator mediator = mediator;

        /// <summary>
        /// {resource.ActionSummary}
        /// </summary>
        /// <param name=""request""></param>
        /// <returns></returns>";
                if (resource.AllowAnonymous)
                {
                    code += $@"
        [AllowAnonymous]";
                }
                code += $@"
        [Http{resource.Method}]
        public Task<{resource.ResponseTypeName}> {resource.ActionName}({resource.RequestTypeName} request)
        {{
            return mediator.Send(request);
        }}

    }}
}}
";
                var dynamicAssembly = App.CompileCSharpClassCode(code);
                provider.AddAssembliesWithNotifyChanges(dynamicAssembly);
                var dynamicAssemblyName = dynamicAssembly.GetName().Name;
                resource.DynamicAssemblyName = dynamicAssemblyName;
            }

        }

        /// <summary>
        /// 动态控制器热拔
        /// </summary>
        /// <param name="resource"></param>
        /// <param name="provider"></param>
        public static void DynamicControllerHotPluck(Resource resource, IDynamicApiRuntimeChangeProvider provider = null)
        {
            provider = provider ?? App.GetRequiredService<IDynamicApiRuntimeChangeProvider>();
            provider.RemoveAssembliesWithNotifyChanges(resource.DynamicAssemblyName);
        }

        /// <summary>
        /// 获取C#友好名称
        /// </summary>
        /// <param name="type"></param>
        /// <returns></returns>
        private static string GetCSharpFriendlyName(this Type type)
        {
            // 处理可空类型
            if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>))
            {
                Type underlyingType = Nullable.GetUnderlyingType(type)!;
                return $"{GetCSharpFriendlyName(underlyingType)}?";
            }

            // 处理基础类型
            if (type.FullName.IsNotNull())
            {
                var baseTypes = new Dictionary<string, string>
                {
                    { "System.Byte", "byte" },
                    { "System.SByte", "sbyte" },
                    { "System.Int16", "short" },
                    { "System.UInt16", "ushort" },
                    { "System.Int32", "int" },
                    { "System.UInt32", "uint" },
                    { "System.Int64", "long" },
                    { "System.UInt64", "ulong" },
                    { "System.Single", "float" },
                    { "System.Double", "double" },
                    { "System.Decimal", "decimal" },
                    { "System.Char", "char" },
                    { "System.Boolean", "bool" },
                    { "System.String", "string" },
                    { "System.Object", "object" }
                };
                if (baseTypes.TryGetValue(type.FullName, out string? friendlyName) && friendlyName.IsNotNull())
                {
                    return friendlyName;
                }
            }

            // 处理非泛型类型
            if (!type.IsGenericType)
            {
                return type.Name;
            }

            // 处理泛型类型
            string genericTypeName = type.GetGenericTypeDefinition().Name;
            if (genericTypeName.Contains('`'))
                genericTypeName = genericTypeName.Substring(0, genericTypeName.IndexOf('`'));

            string[] genericArgs = type.GetGenericArguments()
               .Select(GetCSharpFriendlyName)
               .ToArray();

            return $"{genericTypeName}<{string.Join(", ", genericArgs)}>";
        }
    }
}