using IM_API.Configs;
using IM_API.Configs.Options;
using IM_API.Filters;
using IM_API.Hubs;
using IM_API.Models;
using IM_API.Tools;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.FileProviders;
using Microsoft.IdentityModel.Tokens;
using StackExchange.Redis;
using System.Text;
using System.Text.Json;
using System.Text.Json.Serialization;

namespace IM_API
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var builder = WebApplication.CreateBuilder(args);

            // Add services to the container.
            IConfiguration configuration = new ConfigurationBuilder()
            .SetBasePath(Directory.GetCurrentDirectory())
            .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
            .Build();
            var conOptions = configuration.GetSection("ConnectionStrings").Get<ConnectionOptions>();
            //注入数据库上下文
            builder.Services.AddDbContext<ImContext>(options =>
            {
                options.UseMySql(conOptions.DefaultConnection,ServerVersion.AutoDetect(conOptions.DefaultConnection));
            });
            //注入redis
            var redis = ConnectionMultiplexer.Connect(conOptions.Redis);
            builder.Services.AddSingleton<IConnectionMultiplexer>(redis);

            builder.Services.AddStackExchangeRedisCache(options =>
            {
                options.ConnectionMultiplexerFactory = () => Task.FromResult<IConnectionMultiplexer>(redis);
            });

            builder.Services.AddRabbitMQ(configuration.GetSection("RabbitMqOptions").Get<RabbitMQOptions>());

            builder.Services.AddHttpContextAccessor();

            builder.Services.AddAllService(configuration);

            builder.Services.AddSignalR().AddJsonProtocol(options =>
            {
                // 枚举输出字符串
                options.PayloadSerializerOptions.Converters.Add(new JsonStringEnumConverter());
                options.PayloadSerializerOptions.PropertyNamingPolicy = JsonNamingPolicy.CamelCase;
            });
            //允许所有来源（跨域）
            builder.Services.AddCors(options =>
            {
                options.AddDefaultPolicy(policy =>
                {
                    policy.AllowAnyHeader()
                    .AllowAnyMethod()
                    .AllowAnyHeader()
                    .AllowCredentials()
                    .SetIsOriginAllowed(origin =>
                    {
                        // 允许所有来自本地或特定网段的请求
                        var host = new Uri(origin).Host;
                        return host == "localhost" || host.StartsWith("192.168.");
                    });
                });
            });
            //凭证处理
            builder.Services.AddAuthentication(options =>
            {
                options.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
                options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
            })
                .AddJwtBearer(options =>
                {
                    //https非必须
                    options.RequireHttpsMetadata = false;
                    //保存token
                    options.SaveToken = true;
                    options.TokenValidationParameters = new Microsoft.IdentityModel.Tokens.TokenValidationParameters
                    {
                        //验证签发者
                        ValidateIssuer = true,
                        ValidIssuer = configuration["Jwt:Issuer"],
                        //验证受众
                        ValidateAudience = true,
                        ValidAudience = configuration["Jwt:Audience"],
                        //验证签名密钥
                        ValidateIssuerSigningKey = true,
                        IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(configuration["Jwt:Key"])),
                        //时间偏差容忍
                        ValidateLifetime = true,
                        ClockSkew = TimeSpan.FromSeconds(30)


                    };
                    //websocket token凭证处理
                    options.Events = new JwtBearerEvents { 
                        OnMessageReceived = context =>
                        {
                            var accessToken = context.Request.Query["access_token"];
                            if (!string.IsNullOrEmpty(accessToken))
                            {
                                context.Token = accessToken;
                            }
                            return Task.CompletedTask;
                        },
                        OnAuthenticationFailed = context =>
                        {
                            Console.WriteLine("Authentication failed: " + context.Exception.Message);
                            return Task.CompletedTask;
                        }
                    };
                });
            builder.Services.AddControllers(options =>
            {
                options.Filters.Add<GlobalExceptionFilter>();
            }).AddJsonOptions(options =>
            {
                // 保持 ISO 8601 格式
                //options.JsonSerializerOptions.Converters.Add(new UtcDateTimeConverter());
                // 将枚举转换为字符串
                options.JsonSerializerOptions.Converters.Add(new JsonStringEnumConverter());
                // 建议：保持驼峰命名
                options.JsonSerializerOptions.PropertyNamingPolicy = JsonNamingPolicy.CamelCase;
            });
            builder.Services.AddModelValidation(configuration);
            // Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
            builder.Services.AddEndpointsApiExplorer();
            builder.Services.AddSwaggerGen();

            var app = builder.Build();

            string uploadPath = Path.Combine(Directory.GetCurrentDirectory(), "uploads","files");

            // 2. 如果文件夹不存在则创建，防止程序启动报错
            if (!Directory.Exists(uploadPath))
            {
                Directory.CreateDirectory(uploadPath);
            }

            // 3. 配置静态文件映射
            app.UseStaticFiles(new StaticFileOptions
            {
                // 指定物理磁盘路径
                FileProvider = new PhysicalFileProvider(uploadPath),
                // 指定浏览器访问的虚拟前缀（例如：http://localhost:5000/files/1.jpg）
                RequestPath = "/uploads/files"
            });

            app.UseCors();

            // Configure the HTTP request pipeline.
            if (app.Environment.IsDevelopment())
            {
                app.UseSwagger();
                app.UseSwaggerUI();
            }

            app.UseHttpsRedirection();

            app.UseAuthentication();
            app.UseAuthorization();
            


            app.MapControllers();

            app.MapHub<ChatHub>("/chat").RequireCors();

            app.Run();
        }
    }
}