using FileShare_Common.Core;
using FileShare_Services.Core;
using FileShare_Services.Services.FileLibrary;
using FileShare_Services.Services.QrCode;

namespace FileShare_Services.Endpoints
{
    /// <summary>
    /// 统一端点配置 —— 所有业务端点在此定义一次。
    /// 这是 FileShare-API 和 FileShare-PC 的唯一入口。
    /// </summary>
    public static class AppEndpoints
    {
        /// <summary>
        /// 配置所有业务端点。调用方传入 builder，按需叠加鉴权、过滤器等。
        /// </summary>
        /// <param name="builder">端点构建器</param>
        /// <param name="includeDetails">是否在错误响应中包含异常详情（开发环境 true）</param>
        public static ServiceEndpointBuilder Configure(ServiceEndpointBuilder builder, bool includeDetails = false)
        {
            // ---- 全局异常拦截（自动捕获所有端点中未处理的异常） ----
            builder.Endpoints.AddGlobalFilter(new GlobalExceptionFilter(includeDetails));

            builder.ConfigureEndpoints(endpoints =>
            {
                // ---- 全局日志过滤器（记录每个请求） ----
                endpoints.AddGlobalFilter(async (ctx, next) =>
                {
                    Serilog.Log.Information("→ {Method} {Path}", ctx.Method, ctx.Path);
                    await next(ctx);
                    Serilog.Log.Information("← {Method} {Path} | {StatusCode}", ctx.Method, ctx.Path, ctx.StatusCode);
                });

                // ---- 业务端点注册 ----

                endpoints.MapGet<IFileLibraryEndpointService>("api/library/drives", (service, ctx) => service.GetDrivesAsync(ctx))
                    .WithOpenApi("FileLibrary", "查询服务器磁盘。")
                    .WithName("GetLibraryDrives");

                endpoints.MapGet<IFileLibraryEndpointService, DirectoryQueryRequest>("api/library/directories", (service, request, _) => service.GetDirectoriesAsync(request))
                    .WithOpenApi("FileLibrary", "查询服务器目录。")
                    .WithName("GetLibraryDirectories");

                endpoints.MapGet<IFileLibraryEndpointService>("api/library/roots", (service, ctx) => service.GetRootsAsync(ctx))
                    .WithOpenApi("FileLibrary", "查询文件库目录。")
                    .WithName("GetLibraryRoots");

                endpoints.MapPost<IFileLibraryEndpointService, AddLibraryRootRequest>("api/library/roots", (service, request, _) => service.AddRootAsync(request))
                    .WithOpenApi("FileLibrary", "添加文件库目录。")
                    .WithName("AddLibraryRoot");

                endpoints.MapPost<IFileLibraryEndpointService, UpdateLibraryRootRequest>("api/library/roots/enabled", (service, request, _) => service.SetRootEnabledAsync(request))
                    .WithOpenApi("FileLibrary", "启用或禁用文件库目录。")
                    .WithName("SetLibraryRootEnabled");

                endpoints.MapPost<IFileLibraryEndpointService, DeleteLibraryRootRequest>("api/library/roots/delete", (service, request, _) => service.DeleteRootAsync(request))
                    .WithOpenApi("FileLibrary", "删除文件库目录。")
                    .WithName("DeleteLibraryRoot");

                endpoints.MapPost<IFileLibraryEndpointService, ScanLibraryRootRequest>("api/library/roots/scan", (service, request, _) => service.ScanRootAsync(request))
                    .WithOpenApi("FileLibrary", "立即扫描文件库目录。")
                    .WithName("ScanLibraryRoot");

                endpoints.MapGet<IFileLibraryEndpointService, SearchFilesRequest>("api/files", (service, request, _) => service.SearchFilesAsync(request))
                    .WithOpenApi("FileLibrary", "分页查询已扫描文件。")
                    .WithName("SearchFiles");

                endpoints.MapGet<IFileLibraryEndpointService, BrowseDirectoryRequest>("api/files/browse", (service, request, _) => service.BrowseDirectoryAsync(request))
                    .WithOpenApi("FileLibrary", "浏览文件库目录结构。")
                    .WithName("BrowseDirectory");

                endpoints.MapGet<IFileLibraryEndpointService, RecentFilesRequest>("api/files/recent", (service, request, _) => service.GetRecentFilesAsync(request))
                    .WithOpenApi("FileLibrary", "获取最近添加或最近播放的文件。")
                    .WithName("GetRecentFiles");

                endpoints.MapPost<IFileLibraryEndpointService, MarkFilePlayedRequest>("api/files/played", (service, request, _) => service.MarkFilePlayedAsync(request))
                    .WithOpenApi("FileLibrary", "标记文件已播放。")
                    .WithName("MarkFilePlayed");

                endpoints.MapGet<IFileLibraryEndpointService, FileQueryRequest>("api/files/detail", (service, request, _) => service.GetFileAsync(request))
                    .WithOpenApi("FileLibrary", "查询文件详情。")
                    .WithName("GetFileDetail");

                endpoints.MapGet<IFileLibraryEndpointService, FileQueryRequest>("api/files/text", (service, request, _) => service.GetTextPreviewAsync(request))
                    .WithOpenApi("FileLibrary", "预览文本文件。")
                    .WithName("GetTextPreview");

                endpoints.MapGet("api/files/stream", GetFileStreamAsync)
                    .WithOpenApi("FileLibrary", "流式传输文件（支持 Range 请求）。")
                    .WithName("StreamManagedFile");

                endpoints.MapGet<IQrCodeService>("api/qrcode", (service, ctx) => service.GenerateQrCodeAsync(ctx))
                    .WithOpenApi("Utility", "生成局域网访问二维码。")
                    .WithName("GetQrCode");

                // ---- 需要鉴权的端点示例 ----
                // endpoints.MapGet("api/admin/dashboard", AdminDashboardAsync)
                //     .WithName("AdminDashboard")
                //     .RequireAuthorization = true
                //     .Policy = "AdminOnly";

            });

            return builder;
        }

        #region 业务处理方法

        /// <summary>
        /// 从 <see cref="ServiceEndpointContext.Items"/> 中解析 <see cref="IFileStreamService"/>，
        /// 读取查询参数中的文件 ID，返回文件流响应。
        /// </summary>
        /// <param name="ctx">端点上下文。</param>
        /// <returns>文件流响应对象，服务不可用或 ID 无效时返回 null。</returns>
        private static async Task<object?> GetFileStreamAsync(ServiceEndpointContext ctx)
        {
            var sp = ctx.Items["ServiceProvider"] as IServiceProvider;
            var service = sp?.GetService(typeof(IFileStreamService)) as IFileStreamService;
            if (service is null) return null;

            if (!int.TryParse(ctx.Query.GetValueOrDefault("id"), out var id) || id <= 0)
                return null;

            return await service.GetFileStreamAsync(id);
        }

        #endregion
    }
}