Program.cs

using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.EntityFrameworkCore;
using Microsoft.IdentityModel.Tokens;
using Microsoft.OpenApi.Models;
using Serilog;
using StudentManagementSystem.Auth;
using StudentManagementSystem.Data;
using StudentManagementSystem.Middleware;
using StudentManagementSystem.Repository;
using StudentManagementSystem.Services;
using System.Text;

// Configure Serilog
Log.Logger = new LoggerConfiguration()
    .WriteTo.Console()
    .WriteTo.File("Logs/log.txt", rollingInterval: RollingInterval.Day)
    .CreateLogger();

var builder = WebApplication.CreateBuilder(args);

// Use Serilog instead of built-in logger
builder.Host.UseSerilog();
builder.Services.AddControllers();
builder.Services.AddEndpointsApiExplorer();

// Swagger with JWT Support
builder.Services.AddSwaggerGen(c =>
{
    c.SwaggerDoc("v1", new OpenApiInfo
    {
        Title = "Student Management API",
        Version = "v1"
    });

    // Add JWT Authorization button in Swagger UI
    c.AddSecurityDefinition("Bearer", new OpenApiSecurityScheme
    {
        Name = "Authorization",
        Type = SecuritySchemeType.ApiKey,
        Scheme = "Bearer",
        BearerFormat = "JWT",
        In = ParameterLocation.Header,
        Description = "Enter: Bearer {your token here}"
    });

    c.AddSecurityRequirement(new OpenApiSecurityRequirement
    {
        {
            new OpenApiSecurityScheme
            {
                Reference = new OpenApiReference
                {
                    Type = ReferenceType.SecurityScheme,
                    Id   = "Bearer"
                }
            },
            new string[] {}
        }
    });
});

// Register DbContext
builder.Services.AddDbContext<ApplicationDbContext>(op => 
op.UseSqlServer(builder.Configuration.GetConnectionString("DefaultConnection")));

// Register Repository and Service
builder.Services.AddScoped<IStudentRepository, StudentRepository>();
builder.Services.AddScoped<IStudentService, StudentService>();

// Register JwtHelper
builder.Services.AddScoped<JwtHelper>();

// JWT Authentication
builder.Services.AddAuthentication(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:Key"]!))
        };
    });

var app = builder.Build();

// Register Global Exception Middleware
app.UseMiddleware<ExceptionMiddleware>();

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

app.UseHttpsRedirection();

app.UseAuthorization();

app.MapControllers();

app.Run();