using Microsoft.EntityFrameworkCore;
using FluentValidation;
using Hellang.Middleware.ProblemDetails;
using System.Data;
using Npgsql;
using InventoryService.API.Application.Behaviors;
using InventoryService.API.Infrastructure.Tenant;
using InventoryService.API.Middleware;
using InventoryService.Infrastructure;
using Serilog;

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

try
{
    Log.Information("Starting InventoryService API / Khởi động InventoryService 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: Register multi-tenant services for row-level security
    // VI: Đăng ký multi-tenant services cho bảo mật row-level
    builder.Services.AddHttpContextAccessor();
    builder.Services.AddScoped<ITenantProvider, HttpContextTenantProvider>();
    builder.Services.AddScoped<IInventoryTenantProvider, InventoryTenantProviderAdapter>();

    // EN: Add Dapper IDbConnection for TenantMiddleware RLS / VI: Thêm Dapper IDbConnection cho TenantMiddleware RLS
    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 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 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 = "InventoryService API",
            Version = "v1",
            Description = "InventoryService microservice API / API microservice InventoryService"
        });
        
        // EN: Enable annotations / VI: Bật annotations
        options.EnableAnnotations();
    });

    // 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,
            };
        });
    builder.Services.AddAuthorization();

    // EN: Add CORS / VI: Thêm CORS
    builder.Services.AddCors(options =>
    {
        options.AddDefaultPolicy(policy =>
        {
            policy.WithOrigins(
                      builder.Configuration.GetSection("AllowedOrigins").Get<string[]>()
                      ?? ["http://localhost:3000", "http://localhost:5173", "http://localhost:5000"])
                  .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", "InventoryService API v1");
            c.RoutePrefix = "swagger";
        });
    }

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

    // EN: Set tenant context for row-level security (must be after auth)
    // VI: Đặt tenant context cho bảo mật row-level (phải sau auth)
    app.UseTenantMiddleware();

    // 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
    // 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<InventoryContext>();
            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 { }
