using FileShare_API.Authentication;
using FileShare_API.Services;
using FileShare_EFCore.Database;
using FileShare_Services.Core;
using FileShare_Services.Endpoints;
using FileShare_Services.Services;
using FileShare_Services.Services.AuthService;
using FileShare_Services.Services.FileLibrary;
using FileShare_Services.Services.QrCode;
using Microsoft.AspNetCore.DataProtection;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.IdentityModel.Tokens;
using System.Text;

namespace FileShare_API.Configuration
{
    /// <summary>
    /// API 项目服务配置扩展类，负责注册数据库、鉴权、业务服务和统一端点。
    /// </summary>
    public static class ServicesConfiguration
    {
        /// <summary>
        /// 注册统一端点及其依赖的服务（含数据库）。
        /// 所有业务端点定义在 FileShare-Services/Endpoints/AppEndpoints.cs。
        /// </summary>
        public static IServiceCollection AddUnifiedApiServices(this IServiceCollection services, IConfiguration configuration)
        {
            // ---- 数据库 ----
            // 从 appsettings.json 读取 DatabaseConfiguration 节
            // 注册默认数据库提供程序（SQLite / MySQL / PostgreSQL / SqlServer）
            DatabaseProviderRegistry.RegisterDefaults();

            var databaseConfig = configuration
                .GetSection(nameof(DatabaseConfiguration))
                .Get<DatabaseConfiguration>()
                ?? DatabaseConfiguration.ForSQLite("app.db");

            // 注册 AppDataContext（共享数据上下文）
            services.AddAppDatabase<AppDataContext>(databaseConfig);

            // ---- 业务服务 ----
            services.AddScoped<WeatherForecastService>();
            var thumbnailOptions = configuration
                .GetSection(nameof(ThumbnailStorageOptions))
                .Get<ThumbnailStorageOptions>()
                ?? new ThumbnailStorageOptions();
            services.AddSingleton(thumbnailOptions);
            services.AddSingleton<IVideoThumbnailService>(sp =>
                new VideoThumbnailService(sp.GetRequiredService<ThumbnailStorageOptions>()));
            services.AddScoped<IThumbnailStreamService, ThumbnailStreamService>();
            services.AddScoped<IFileLibraryService, FileLibraryService>();
            services.AddScoped<IFileLibraryEndpointService, FileLibraryEndpointService>();
            services.AddScoped<IFileStreamService, FileStreamService>();
            services.AddScoped<IQrCodeService, QrCodeService>();
            services.Configure<FileLibraryScanOptions>(configuration.GetSection(nameof(FileLibraryScanOptions)));
            services.AddHostedService<FileLibraryScanHostedService>();
            services.AddDataProtection()
                .PersistKeysToFileSystem(new DirectoryInfo(Path.Combine(AppContext.BaseDirectory, "data-protection-keys")));

            // ---- API 鉴权 ----
            var jwtSection = configuration.GetSection("Jwt");
            services.Configure<JwtOptions>(jwtSection);
            var jwtOptions = jwtSection.Get<JwtOptions>() ?? new JwtOptions();
            services
                .AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
                .AddJwtBearer(options =>
                {
                    options.TokenValidationParameters = new TokenValidationParameters
                    {
                        ValidateIssuer = true,
                        ValidateAudience = true,
                        ValidateLifetime = true,
                        ValidateIssuerSigningKey = true,
                        ValidIssuer = jwtOptions.Issuer,
                        ValidAudience = jwtOptions.Audience,
                        IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(jwtOptions.SigningKey)),
                        ClockSkew = TimeSpan.FromMinutes(1),
                    };
                });
            services.AddAuthorization();
            services.AddScoped<JwtTokenService>();
            services.AddScoped<RefreshTokenService>();
            services.AddScoped<IApiAuthEndpointService, ApiAuthEndpointService>();

            // ---- 统一端点 ----
            var endpointBuilder = new ServiceEndpointBuilder();
            AppEndpoints.Configure(endpointBuilder);
            AuthEndpoints.ConfigureApi(endpointBuilder);
            var endpoints = endpointBuilder.Build();
            services.AddSingleton(endpoints);

            return services;
        }
    }
}