using Microsoft.EntityFrameworkCore;
using Asp.Versioning;
using FluentValidation;
using Hellang.Middleware.ProblemDetails;
using AdsAnalyticsService.API.Application.Behaviors;
using AdsAnalyticsService.Infrastructure;
using Serilog;

// EN: Configure Serilog early / VI: Cấu hình Serilog sớm
Log.Logger = new LoggerConfiguration()
    .WriteTo.Console()
    .CreateBootstrapLogger();

try
{
    Log.Information("Starting AdsAnalyticsService API / Khởi động AdsAnalyticsService API");

    var builder = WebApplication.CreateBuilder(args);

    // EN: Configure Serilog / VI: Cấu hình Serilog
    builder.Host.UseSerilog((context, services, configuration) => configuration
        .ReadFrom.Configuration(context.Configuration)
        .ReadFrom.Services(services)
        .Enrich.FromLogContext()
        .WriteTo.Console());

    // EN: Add Infrastructure services / VI: Thêm Infrastructure services
    builder.Services.AddInfrastructure(builder.Configuration);

    // EN: Add MediatR with behaviors / VI: Thêm MediatR với behaviors
    builder.Services.AddMediatR(cfg =>
    {
        cfg.RegisterServicesFromAssemblyContaining<Program>();
        cfg.AddOpenBehavior(typeof(LoggingBehavior<,>));
        cfg.AddOpenBehavior(typeof(ValidatorBehavior<,>));
        cfg.AddOpenBehavior(typeof(TransactionBehavior<,>));
    });

    // EN: Add FluentValidation / VI: Thêm FluentValidation
    builder.Services.AddValidatorsFromAssemblyContaining<Program>();

    // EN: Add API versioning / VI: Thêm API versioning
    builder.Services.AddApiVersioning(options =>
    {
        options.DefaultApiVersion = new ApiVersion(1, 0);
        options.AssumeDefaultVersionWhenUnspecified = true;
        options.ReportApiVersions = true;
        options.ApiVersionReader = ApiVersionReader.Combine(
            new UrlSegmentApiVersionReader(),
            new HeaderApiVersionReader("X-Api-Version"));
    })
    .AddApiExplorer(options =>
    {
        options.GroupNameFormat = "'v'VVV";
        options.SubstituteApiVersionInUrl = true;
    });

    // EN: Add controllers / VI: Thêm controllers
    builder.Services.AddControllers();

    // EN: Add ProblemDetails middleware (RFC 7807) / VI: Thêm ProblemDetails middleware
    builder.Services.AddProblemDetails(options =>
    {
        options.IncludeExceptionDetails = (ctx, ex) =>
            builder.Environment.IsDevelopment();
    });

    // EN: Add Swagger / VI: Thêm Swagger
    builder.Services.AddEndpointsApiExplorer();
    builder.Services.AddSwaggerGen(options =>
    {
        options.SwaggerDoc("v1", new()
        {
            Title = "AdsAnalyticsService API",
            Version = "v1",
            Description = "AdsAnalyticsService microservice API / API microservice AdsAnalyticsService"
        });
    });

    // EN: Add health checks / VI: Thêm health checks
    builder.Services.AddHealthChecks()
        .AddNpgSql(
            builder.Configuration.GetConnectionString("DefaultConnection")
                ?? builder.Configuration["DATABASE_URL"]
                ?? "",
            name: "postgresql",
            tags: ["db", "postgresql"]);

    // EN: Add JWT Bearer authentication via IAM IdentityServer OIDC discovery
    // VI: Thêm JWT Bearer authentication qua IAM IdentityServer OIDC discovery
    var jwtAuthority = builder.Configuration["Jwt:Authority"] ?? "http://localhost:5001";
    builder.Services.AddAuthentication(Microsoft.AspNetCore.Authentication.JwtBearer.JwtBearerDefaults.AuthenticationScheme)
        .AddJwtBearer(options =>
        {
            options.Authority = jwtAuthority;
            options.RequireHttpsMetadata = false;
            options.TokenValidationParameters = new Microsoft.IdentityModel.Tokens.TokenValidationParameters
            {
                ValidateIssuer = false,
                ValidateAudience = false,
                ValidateLifetime = true,
                // EN: In Development, skip signature validation to allow Docker IAM tokens
                // VI: Trong Development, bỏ qua validate signature để chấp nhận token từ Docker IAM
                ValidateIssuerSigningKey = builder.Environment.IsDevelopment() ? false : true,
                SignatureValidator = builder.Environment.IsDevelopment()
                    ? (token, _) => new Microsoft.IdentityModel.JsonWebTokens.JsonWebToken(token)
                    : null,
            };
        });
    builder.Services.AddAuthorization();

    // EN: Add CORS / VI: Thêm CORS
    builder.Services.AddCors(options =>
    {
        options.AddDefaultPolicy(policy =>
        {
            policy.AllowAnyOrigin()
                  .AllowAnyMethod()
                  .AllowAnyHeader();
        });
    });

    var app = builder.Build();

    // EN: Configure middleware pipeline / VI: Cấu hình middleware pipeline
    app.UseSerilogRequestLogging();
    app.UseProblemDetails();

    if (app.Environment.IsDevelopment())
    {
        app.UseSwagger();
        app.UseSwaggerUI(c =>
        {
            c.SwaggerEndpoint("/swagger/v1/swagger.json", "AdsAnalyticsService API v1");
            c.RoutePrefix = "swagger";
        });
    }

    app.UseCors();
    app.UseRouting();

    // EN: Add authentication & authorization middleware / VI: Thêm middleware xác thực & phân quyền
    app.UseAuthentication();
    app.UseAuthorization();

    // EN: Map health check endpoints (anonymous) / VI: Map health check endpoints (không cần xác thực)
    app.MapHealthChecks("/health").AllowAnonymous();
    app.MapHealthChecks("/health/live", new()
    {
        Predicate = _ => false // EN: Just checks app is running / VI: Chỉ kiểm tra app đang chạy
    }).AllowAnonymous();
    app.MapHealthChecks("/health/ready").AllowAnonymous();

    // EN: Map controllers / VI: Map controllers
    app.MapControllers();

    // EN: Run the application / VI: Chạy ứng dụng
    // EN: Auto-apply EF Core migrations on startup
    // VI: Tự động áp dụng EF Core migrations khi khởi động
    try
    {
        using (var scope = app.Services.CreateScope())
        {
            var dbContext = scope.ServiceProvider.GetRequiredService<AdsAnalyticsServiceContext>();
            await dbContext.Database.MigrateAsync();
        }
    }
    catch (Exception ex)
    {
        // EN: Log migration errors but don't crash the app (e.g. PendingModelChangesWarning in EF Core 10)
        // VI: Log lỗi migration nhưng không crash app
        Console.WriteLine($"Warning: EF Core migration issue: {ex.Message}");
    }

    app.Run();
}
catch (Exception ex)
{
    Log.Fatal(ex, "Application terminated unexpectedly / Ứng dụng kết thúc bất ngờ");
    throw;
}
finally
{
    Log.CloseAndFlush();
}

// EN: Make Program class accessible for integration tests
// VI: Làm cho class Program có thể truy cập cho integration tests
public partial class Program { }