using System.Text;
using System.Text.Json.Serialization;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.EntityFrameworkCore;
using Microsoft.IdentityModel.Tokens;
using Microsoft.OpenApi;
using Serilog;
using UniVerse.Api.BackgroundServices;
using UniVerse.Api.Middleware;
using UniVerse.Application.Interfaces;
using UniVerse.Infrastructure.Services;
using UniVerse.Infrastructure.Data;
using UniVerse.Infrastructure.ExternalServices;

var builder = WebApplication.CreateBuilder(args);

var useAspire = builder.Configuration.GetValue<bool>("Aspire:Enabled");

if (useAspire)
{
    builder.AddServiceDefaults();
}

// --- Serilog ---
Log.Logger = new LoggerConfiguration()
    .ReadFrom.Configuration(builder.Configuration)
    .Enrich.FromLogContext()
    .WriteTo.Console()
    .CreateLogger();
builder.Host.UseSerilog();

// --- DbContext ---
builder.Services.AddDbContext<AppDbContext>(options =>
{
    options.UseNpgsql(builder.Configuration.GetConnectionString("DefaultConnection"),
        npgsql =>
        {
            npgsql.EnableRetryOnFailure(3);
            npgsql.MigrationsAssembly("UniVerse.Infrastructure"); // Указывает EF Core, в какой сборке искать/хранить миграции.
        });
});

// --- Authentication ---
builder.Services.AddAuthentication(options =>
{
    options.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
    options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
})
.AddJwtBearer(options =>
{
    options.TokenValidationParameters = new TokenValidationParameters
    {
        ValidateIssuer = true,
        ValidateAudience = true,
        ValidateLifetime = true,
        ValidateIssuerSigningKey = true,
        ValidIssuer = builder.Configuration["Jwt:Issuer"],
        ValidAudience = builder.Configuration["Jwt:Audience"],
        IssuerSigningKey = new SymmetricSecurityKey(
            Encoding.UTF8.GetBytes(builder.Configuration["Jwt:Secret"]!))
    };
});
builder.Services.AddAuthorization();

// --- CORS ---
builder.Services.AddCors(options =>
{
    options.AddDefaultPolicy(policy =>
    {
        policy.WithOrigins(
                builder.Configuration.GetSection("Cors:Origins").Get<string[]>()
                ?? ["http://localhost:5173", "http://localhost:3000"])
            .AllowAnyHeader()
            .AllowAnyMethod()
            .AllowCredentials();
    });
});

// --- Services DI ---
builder.Services.AddScoped<IAuthService, AuthService>();
builder.Services.AddScoped<IUserService, UserService>();
builder.Services.AddScoped<ITagService, TagService>();
builder.Services.AddScoped<ILocationService, LocationService>();
builder.Services.AddScoped<ICourseService, CourseService>();
builder.Services.AddScoped<ILectureService, LectureService>();
builder.Services.AddScoped<IReviewService, ReviewService>();
builder.Services.AddScoped<IGamificationService, GamificationService>();
builder.Services.AddScoped<IAchievementService, AchievementService>();
builder.Services.AddScoped<ILlmAnalysisService, LlmAnalysisService>();
builder.Services.AddScoped<IScheduleSyncService, ScheduleSyncService>();

// --- HTTP Clients ---
builder.Services.AddHttpClient<ILlmClient, LlmClient>(client =>
{
    client.BaseAddress = new Uri(builder.Configuration["Llm:BaseUrl"] ?? "https://api.openai.com/v1/");
    client.Timeout = TimeSpan.FromSeconds(60);
});

builder.Services.AddHttpClient<IModeusApiClient, ModeusApiClient>(client =>
{
    client.BaseAddress = new Uri(builder.Configuration["ModeusApi:BaseUrl"] ?? "https://schedule.rdcenter.ru");
    client.Timeout = TimeSpan.FromSeconds(30);
});

// --- Background Services ---
builder.Services.AddHostedService<LlmProcessingBackgroundService>();

// --- Controllers ---
builder.Services.AddControllers()
    .AddJsonOptions(o =>
    {
        o.JsonSerializerOptions.Converters.Add(new JsonStringEnumConverter());
        o.JsonSerializerOptions.DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull;
    });

// --- Swagger ---
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen(options =>
{
    options.SwaggerDoc("v1", new OpenApiInfo
    {
        Title = "UniVerse API",
        Version = "v1",
        Description = "Universe"
    });

    options.AddSecurityDefinition("Bearer", new OpenApiSecurityScheme
    {
        Name = "Authorization",
        Type = SecuritySchemeType.Http,
        Scheme = "bearer",
        BearerFormat = "JWT",
        In = ParameterLocation.Header,
        Description = "Enter your JWT token"
    });

    options.AddSecurityRequirement(doc =>
    {
        var bearerSchemeRef = new OpenApiSecuritySchemeReference("Bearer", doc, externalResource: null);
        return new OpenApiSecurityRequirement
        {
            [bearerSchemeRef] = new List<string>()
        };
    });
});

var app = builder.Build();

if (useAspire)
{
    app.MapDefaultEndpoints();
}

// --- Middleware Pipeline ---
app.UseMiddleware<RequestLoggingMiddleware>();
app.UseMiddleware<ExceptionHandlingMiddleware>();

if (app.Environment.IsDevelopment())
{
    app.UseSwagger(c =>
    {
        c.RouteTemplate = "api/docs/{documentName}/swagger.json";
    });

    app.UseSwaggerUI(c =>
    {
        c.RoutePrefix = "api/docs";
        c.SwaggerEndpoint("v1/swagger.json", "UniVerse API v1");
    });
}

app.UseCors();
app.UseAuthentication();
app.UseAuthorization();
app.MapControllers();

app.Run();