using System.Data;
using Asp.Versioning;
using FluentValidation;
using Hellang.Middleware.ProblemDetails;
using Npgsql;
using OrderService.API.Application.Behaviors;
using OrderService.API.Application.Strategies;
using OrderService.API.Infrastructure.HttpClients;
using OrderService.Domain.Strategies;
using OrderService.Infrastructure;
using Polly;
using Polly.Extensions.Http;
using Serilog;

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

try
{
    Log.Information("Starting OrderService API / Khởi động OrderService 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 Dapper IDbConnection / VI: Thêm Dapper IDbConnection
    builder.Services.AddTransient<IDbConnection>(sp =>
    {
        var connectionString = builder.Configuration.GetConnectionString("DefaultConnection")
            ?? builder.Configuration["DATABASE_URL"]
            ?? throw new InvalidOperationException("Database connection string is required");
        return new NpgsqlConnection(connectionString);
    });

    // EN: Add HTTP Clients with Polly / VI: Thêm HTTP Clients với Polly
    var retryPolicy = HttpPolicyExtensions
        .HandleTransientHttpError()
        .WaitAndRetryAsync(3, retryAttempt => TimeSpan.FromSeconds(Math.Pow(2, retryAttempt)));

    var circuitBreakerPolicy = HttpPolicyExtensions
        .HandleTransientHttpError()
        .CircuitBreakerAsync(5, TimeSpan.FromSeconds(30));

    builder.Services.AddHttpClient<CatalogServiceClient>(client =>
        {
            client.BaseAddress = new Uri(builder.Configuration["Services:CatalogService"] ?? "http://catalog-service-net:8080");
            client.Timeout = TimeSpan.FromSeconds(10);
        })
        .AddPolicyHandler(retryPolicy)
        .AddPolicyHandler(circuitBreakerPolicy);

    builder.Services.AddHttpClient<InventoryServiceClient>(client =>
        {
            client.BaseAddress = new Uri(builder.Configuration["Services:InventoryService"] ?? "http://inventory-service-net:8080");
            client.Timeout = TimeSpan.FromSeconds(10);
        })
        .AddPolicyHandler(retryPolicy)
        .AddPolicyHandler(circuitBreakerPolicy);

    builder.Services.AddHttpClient<BookingServiceClient>(client =>
        {
            client.BaseAddress = new Uri(builder.Configuration["Services:BookingService"] ?? "http://booking-service-net:8080");
            client.Timeout = TimeSpan.FromSeconds(10);
        })
        .AddPolicyHandler(retryPolicy)
        .AddPolicyHandler(circuitBreakerPolicy);

    builder.Services.AddHttpClient<FnbEngineClient>(client =>
        {
            client.BaseAddress = new Uri(builder.Configuration["Services:FnbEngine"] ?? "http://fnb-engine-net:8080");
            client.Timeout = TimeSpan.FromSeconds(10);
        })
        .AddPolicyHandler(retryPolicy)
        .AddPolicyHandler(circuitBreakerPolicy);

    // EN: Register Strategies / VI: Đăng ký Strategies
    builder.Services.AddTransient<ILineItemStrategy, RetailStrategy>();
    builder.Services.AddTransient<ILineItemStrategy, ServiceStrategy>();
    builder.Services.AddTransient<ILineItemStrategy, FnbStrategy>();
    builder.Services.AddSingleton<StrategyFactory>();

    // 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 = "OrderService API",
            Version = "v1",
            Description = "OrderService microservice API / API microservice OrderService"
        });
    });

    // 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 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", "OrderService API v1");
            c.RoutePrefix = "swagger";
        });
    }

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

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

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

    // EN: Run the application / VI: Chạy ứng dụng
    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 { }
