using Hangfire;
using Hangfire.MySql;
using HangfireBasicAuthenticationFilter;
using MAX.Core.Interfaces;
using MAX.Framework.Interfaces;
using Microsoft.AspNetCore.Builder;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using MySql.Data.MySqlClient;
using Store.Modules.CloudProduct.Services;

namespace Store.Modules.CloudProduct
{
	/// <summary>
	/// CloudProduct 模块的模块化入口（<see cref="IModule"/>）：Hangfire 后台任务（商品分词同步）+ Hangfire 看板。
	/// 与 <see cref="Startup"/>（只做 IStartup 的 Initialize/Register）分开，是因为模块注册需要配置和 app：
	/// <list type="bullet">
	/// <item><c>builder.AddStoreHub()</c> 执行 <see cref="AddModule"/>（注册 Hangfire 服务，此时只能拿到容器和配置）；</item>
	/// <item><c>app.UseStoreHubModules()</c> 执行 <see cref="UseModule"/>（挂看板中间件 + 注册定时任务，此时才有 app）。</item>
	/// </list>
	/// </summary>
	public class CloudProductModule : ModuleBase
	{
		/// <summary>
		/// 本模块自己的配置文件（源码里是 Models/CloudProduct/appsettings.json，
		/// 构建时复制到宿主输出目录并改名成这个名字，避免与宿主的 appsettings.json 冲突）
		/// </summary>
		public const string ConfigurationFileName = "appsettings.CloudProduct.json";

		public override int Priority => IntPriority.Normal;

		public override string? ConfigurationFile => ConfigurationFileName;

		/// <summary>
		/// 服务注册阶段（builder.Build() 之前）：这里只能拿到容器和配置，碰不到 app
		/// </summary>
		public override void AddModule(ModuleContext context)
		{
			IServiceCollection services = context.Services;
			IConfiguration configuration = context.Configuration;

			// 本模块的配置节（Search / RawData / Indexing / Delete）都在模块自己的配置文件里，
			// 关键项缺失直接报错，避免 OpenSearch 地址为空、原始数据写到意外目录之类的隐性故障
			RequireConfiguration(configuration, "Search:Url");
			RequireConfiguration(configuration, "Search:IndexName");
			RequireConfiguration(configuration, "RawData:Path");

			// ===== Hangfire 后台定时任务（商品分词同步） =====
			var hangfireConnection = configuration.GetConnectionString("DefaultConnection")
				?? throw new InvalidOperationException("缺少配置 ConnectionStrings:DefaultConnection，CloudProduct 模块的 Hangfire 无法启动。");

			// AllowUserVariables=true：Hangfire.MySqlStorage 的建表/查询语句依赖用户变量
			var connectionStringBuilder = new MySqlConnectionStringBuilder(hangfireConnection)
			{
				AllowUserVariables = true
			};

			services.AddHangfire(config => config
				.SetDataCompatibilityLevel(CompatibilityLevel.Version_180)
				.UseSimpleAssemblyNameTypeSerializer()
				.UseRecommendedSerializerSettings()
				.UseStorage(new MySqlStorage(connectionStringBuilder.ConnectionString, new MySqlStorageOptions() { TablesPrefix = "Hangfire_" })));
			services.AddHangfireServer();
			services.AddTransient<GoodsIndexJob>();
		}

		/// <summary>
		/// 管道装配阶段（builder.Build() 之后、app.Run() 之前）：这里可以挂中间件、解析容器里的服务
		/// </summary>
		public override void UseModule(WebApplication app)
		{
			try
			{
				// Hangfire 后台任务看板（默认地址 /hangfire）
				app.UseHangfireDashboard("/hangfire", new DashboardOptions
				{
					Authorization = new[]
					{
						new HangfireCustomBasicAuthenticationFilter(){
							User = app.Configuration.GetValue<string>("Hangfire:Dashboard:User") ?? "admin",
							Pass = app.Configuration.GetValue<string>("Hangfire:Dashboard:Pass") ?? "1234560"
						}
					}
				});

				// 注册定时任务：把未同步（IndexStatus=0）的商品写入 OpenSearch 分词索引
				var cron = app.Configuration.GetValue<string>("Indexing:Cron") ?? "*/5 * * * *";

				// 用容器里的 IRecurringJobManager，而不是静态 RecurringJob：
				// AddHangfire 只把 JobStorage 注册进容器（没有设置 JobStorage.Current），静态 API 在 Build() 之后调用会直接抛异常。
				app.Services.GetRequiredService<IRecurringJobManager>().AddOrUpdate<GoodsIndexJob>(
					"goods-index-pending",
					job => job.ProcessPendingAsync(),
					cron);
			}
			catch (Exception ex)
			{
				// 数据库不可用/表未初始化时避免阻断应用启动（看板与定时任务都会连库），恢复后重启即可重新装配
				Console.WriteLine("[Hangfire] 看板/定时任务装配失败: " + ex.Message);
			}
		}

		/// <summary>
		/// 校验模块配置项存在（值来自模块自己的 <see cref="ConfigurationFileName"/>）
		/// </summary>
		private static void RequireConfiguration(IConfiguration configuration, string key)
		{
			if (string.IsNullOrWhiteSpace(configuration.GetValue<string>(key)))
			{
				throw new InvalidOperationException($"缺少配置 {key}，请检查模块配置文件 {ConfigurationFileName}。");
			}
		}
	}
}