Program.cs

using System.Reflection;
using System.Text;
using DotNetEnv;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.EntityFrameworkCore;
using Microsoft.IdentityModel.Tokens;
using Microsoft.OpenApi.Models;
using SkillSwap.Interfaces;
using SkillSwap.Models;
using SkillSwap.Services;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
Env.Load();

// Set dynamic port for Render/Railway/Production
var port = Environment.GetEnvironmentVariable("PORT") ?? "8080";
builder.WebHost.ConfigureKestrel(options =>
{
    options.ListenAnyIP(int.Parse(port));
});

builder.Services.AddSignalR();
builder.Configuration.AddEnvironmentVariables();
builder.Services.AddControllers();

var smtpHost = Environment.GetEnvironmentVariable("SMTP_HOST");
var smtpPort = Environment.GetEnvironmentVariable("SMTP_PORT");
var smtpUser = Environment.GetEnvironmentVariable("SMTP_USER");
var smtpPass = Environment.GetEnvironmentVariable("SMTP_PASS");

builder.Services.AddScoped<IEmailService, EmailService>();

// Add CORS policy
builder.Services.AddCors(options =>
{
    options.AddPolicy("AllowSpecificOrigin",
        policy =>
        {
            policy.WithOrigins("http://localhost:3000", "http://localhost:3001", "https://skillswapriwi.azurewebsites.net",
                                "https://skillswap-qww9.onrender.com", "https://skillswapten.vercel.app", "https://skill-swap-ten.vercel.app")
                  .AllowAnyHeader()
                  .AllowAnyMethod();

        });
});

builder.Services.AddAutoMapper(AppDomain.CurrentDomain.GetAssemblies());

// Add Swagger services and configure it to include XML comments
builder.Services.AddSwaggerGen(c =>
{
    c.SwaggerDoc("v1", new OpenApiInfo
    {
        Title = "My API",
        Version = "v1",
        Description = "API for user management"
    });

    // Get the XML comments file path
    var xmlFile = $"{Assembly.GetExecutingAssembly().GetName().Name}.xml";
    var xmlPath = Path.Combine(AppContext.BaseDirectory, xmlFile);

    // Include the XML comments from the generated file
    c.IncludeXmlComments(xmlPath);
});


builder.Services.AddTransient<DataValidator>();

var dbHost = Environment.GetEnvironmentVariable("DB_HOST");
var dbPort = Environment.GetEnvironmentVariable("DB_PORT");
var dbDatabaseName = Environment.GetEnvironmentVariable("DB_DATABASE");
var dbUser = Environment.GetEnvironmentVariable("DB_USERNAME");
var dbPassword = Environment.GetEnvironmentVariable("DB_PASSWORD");
var conectionDB = $"server={dbHost};port={dbPort};database={dbDatabaseName};uid={dbUser};password={dbPassword}";
builder.Services.AddDbContext<AppDbContext>(options =>
    options.UseMySql(conectionDB, ServerVersion.Parse("8.0.20-mysql")));


// Retrieving JWT variables from the .env file
var jwtKey = Environment.GetEnvironmentVariable("JWT_KEY");
var jwtIssuer = Environment.GetEnvironmentVariable("JWT_ISSUER");
var jwtAudience = Environment.GetEnvironmentVariable("JWT_AUDIENCE");
var jwtExpireMinutes = Environment.GetEnvironmentVariable("JWT_EXPIREMINUTES");

// Configure JWT
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 = jwtIssuer,
        ValidAudience = jwtAudience,
        IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(jwtKey))
    };
});

// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();

var app = builder.Build();

// Use the CORS policy
app.UseCors("AllowSpecificOrigin");

app.MapHub<ChatHub>("/chathub");

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

// Configure the HTTP request pipeline.

app.UseSwagger();
app.UseSwaggerUI();

app.UseHttpsRedirection();

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

app.MapControllers();

app.Run();