using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.AspNetCore.Authentication.Negotiate;
using Microsoft.EntityFrameworkCore;
using Microsoft.IdentityModel.Tokens;
using Microsoft.SelfService.Portal.Core.API.Authorization;
using Microsoft.SelfService.Portal.Core.API.Context;
using Microsoft.SelfService.Portal.Core.API.Interfaces;
using Microsoft.SelfService.Portal.Core.API.Repository;
using Microsoft.SelfService.Portal.Core.API.Services;
using Microsoft.Extensions.FileProviders;

using System.IdentityModel.Tokens.Jwt;
using System.Text.Json.Serialization;


var builder = WebApplication.CreateBuilder(args);

// Add services to the container.

builder.Services.AddControllers().AddJsonOptions(options =>
{
    options.JsonSerializerOptions.ReferenceHandler = ReferenceHandler.IgnoreCycles;
});

builder.Services.AddScoped<IDomainInterface,DomainRepository>();
builder.Services.AddScoped<IEnvironmentInterface, EnvironmentRepository>();
builder.Services.AddScoped<ITargetInterface, TargetRepository>();
builder.Services.AddScoped<IServiceInterface, ServiceRepository>();
builder.Services.AddScoped<IDeploymentBatchInterface, DeploymentBatchRepository>();
builder.Services.AddScoped<IDeploymentInterface, DeploymentRepository>();
builder.Services.AddScoped<ITemplateInterface, TemplateRepository>();
builder.Services.AddScoped<ITemplateCategoryInterface, TemplateCategoryRepository>();
builder.Services.AddScoped<IQueueJobService, QueueJobService>();
builder.Services.AddScoped<ApiTokenService>();

// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();
builder.Services.AddAutoMapper(_ => { }, AppDomain.CurrentDomain.GetAssemblies());

builder.Services.AddDbContext<DataContext>(options =>
    options.UseSqlServer(builder.Configuration.GetConnectionString("Context") ?? throw new InvalidOperationException("Connection string 'Context' not found.")));

var tokenService = new ApiTokenService(builder.Configuration);

builder.Services.AddAuthentication(options =>
    {
        options.DefaultScheme = "Smart";
        options.DefaultChallengeScheme = "Smart";
    })
   .AddPolicyScheme("Smart", "Negotiate or Bearer", options =>
   {
       options.ForwardDefaultSelector = context =>
       {
           var authorization = context.Request.Headers.Authorization.ToString();
           return authorization.StartsWith("Bearer ", StringComparison.OrdinalIgnoreCase)
               ? JwtBearerDefaults.AuthenticationScheme
               : NegotiateDefaults.AuthenticationScheme;
       };
   })
   .AddNegotiate()
   .AddJwtBearer(options =>
   {
       options.TokenValidationParameters = new TokenValidationParameters
       {
           ValidateIssuer = true,
           ValidIssuer = tokenService.Issuer,
           ValidateAudience = true,
           ValidAudience = tokenService.Audience,
           ValidateIssuerSigningKey = true,
           IssuerSigningKey = tokenService.GetSigningKey(),
           ValidateLifetime = true,
           ClockSkew = TimeSpan.FromMinutes(2)
       };

       options.Events = new JwtBearerEvents
       {
           OnTokenValidated = context =>
           {
               var jti = context.Principal?.FindFirst(JwtRegisteredClaimNames.Jti)?.Value;
               if (string.IsNullOrWhiteSpace(jti))
               {
                   context.Fail("Token does not contain a token id.");
                   return Task.CompletedTask;
               }

               var dataContext = context.HttpContext.RequestServices.GetRequiredService<DataContext>();
               var token = dataContext.ApiTokens.FirstOrDefault(existing => existing.Jti == jti);
               if (token == null)
               {
                   context.Fail("Token is not registered.");
                   return Task.CompletedTask;
               }

               if (token.RevokedAt.HasValue || token.ExpiresAt <= DateTime.UtcNow)
               {
                   context.Fail("Token is revoked or expired.");
                   return Task.CompletedTask;
               }

               token.LastUsedAt = DateTime.UtcNow;
               token.Modified = DateTime.UtcNow;
               token.ModifiedBy = "BearerToken";
               dataContext.SaveChanges();

               return Task.CompletedTask;
           }
       };
   });

builder.Services.AddHttpContextAccessor();

builder.Services.AddSelfServicePortalAuthorization();

var app = builder.Build();
var frontendDistPath = Path.GetFullPath(Path.Combine(
    app.Environment.ContentRootPath,
    "..",
    "Microsoft.SelfService.Portal.Web",
    "dist"));

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

app.UseHttpsRedirection();

if (Directory.Exists(frontendDistPath))
{
    var frontendDistProvider = new PhysicalFileProvider(frontendDistPath);

    app.UseDefaultFiles(new DefaultFilesOptions
    {
        FileProvider = frontendDistProvider
    });

    app.UseStaticFiles(new StaticFileOptions
    {
        FileProvider = frontendDistProvider
    });
}

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

app.MapControllers();

if (Directory.Exists(frontendDistPath))
{
    app.MapFallback(async context =>
    {
        if (context.Request.Path.StartsWithSegments("/api"))
        {
            context.Response.StatusCode = StatusCodes.Status404NotFound;
            await context.Response.WriteAsJsonAsync(new { message = "API endpoint not found." });
            return;
        }

        context.Response.ContentType = "text/html";
        await context.Response.SendFileAsync(Path.Combine(frontendDistPath, "index.html"));
    }).AllowAnonymous();
}

app.Run();