using Asp.Versioning;
using Azure.Identity;
using Core.Blueprint.Logging.Configuration;
using Core.Thalos.Adapters.Contracts;
using Core.Thalos.Adapters.Extensions;
using Core.Thalos.Adapters.Services;
using Core.Thalos.BFF.Api.Services;
using Core.Thalos.External.ClientConfiguration;
using Google.Protobuf.WellKnownTypes;
using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Authentication.Cookies;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.AspNetCore.Authentication.OpenIdConnect;
using Microsoft.AspNetCore.ResponseCompression;
using Microsoft.Extensions.Configuration.AzureAppConfiguration;
using Microsoft.IdentityModel.Tokens;
using Microsoft.OpenApi.Any;
using Microsoft.OpenApi.Interfaces;
using Microsoft.OpenApi.Models;
using OpenTelemetry.Logs;
using OpenTelemetry.Resources;
using Swashbuckle.AspNetCore.SwaggerUI;
using System.IO.Compression;
using System.Reflection;
using System.Security.Claims;

var builder = WebApplication.CreateBuilder(args);

builder.Configuration
    .AddUserSecrets(Assembly.GetExecutingAssembly())
    .AddEnvironmentVariables();

// 🔑 Google Auth config
var googleClientId = builder.Configuration["Authentication:Google:ClientId"];
var googleClientSecret = builder.Configuration["Authentication:Google:ClientSecret"];
var redirectUri = builder.Configuration["Authentication:Google:RedirectUri"];

// 🧩 Authentication
builder.Services.AddAuthentication(options =>
{
    options.DefaultAuthenticateScheme = Constant.Scheme;
    options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
})
.AddScheme<AuthenticationSchemeOptions,
GoogleAccessTokenAuthenticationHandler>(Constant.Scheme, null)
.AddGoogle(options =>
{
    options.ClientId = googleClientId!;
    options.ClientSecret = googleClientSecret!;
    //options.SaveTokens = true;
    options.CallbackPath = $"/{redirectUri}";
});

builder.Services.AddAuthorization();
builder.Services.AddScoped<IGoogleAuthHelper, GoogleAuthHelperService>();
builder.Services.AddScoped<IGoogleAuthorization, GoogleAuthorizationService>();
builder.Services.AddEndpointsApiExplorer();

// 🧩 Swagger + OAuth2
builder.Services.AddSwaggerGen(opts =>
{
    const string schemeName = "oauth2";

    opts.SwaggerDoc("v1",
        new OpenApiInfo { Title = "Core.Thalos.BFF", Version = "v1" });

    opts.AddSecurityDefinition(schemeName, new OpenApiSecurityScheme
    {
        Type = SecuritySchemeType.OAuth2,
        Scheme = "bearer",              // tells Swagger-UI to build an Authorization header
        BearerFormat = "JWT",
        Name = "Authorization",
        In = ParameterLocation.Header,

        /* ⚠️  The key line – tell Swagger-UI to pick id_token instead of access_token */
        Extensions = new Dictionary<string, IOpenApiExtension>
        {
            ["x-tokenName"] = new OpenApiString("id_token")
        },

        Flows = new OpenApiOAuthFlows
        {
            AuthorizationCode = new OpenApiOAuthFlow
            {
                AuthorizationUrl = new Uri("https://accounts.google.com/o/oauth2/v2/auth"),
                TokenUrl = new Uri("https://oauth2.googleapis.com/token"),
                Scopes = new Dictionary<string, string>
                {
                    { "openid",  "OpenID Connect" },
                    { "email",   "Access email"   },
                    { "profile", "Access profile" }
                }
            }
        }
    });

    // every operation requires the scheme
    opts.AddSecurityRequirement(new OpenApiSecurityRequirement
    {
        [new OpenApiSecurityScheme
        {
            Reference = new OpenApiReference
            { Type = ReferenceType.SecurityScheme, Id = schemeName }
        }
        ] = new[] { "openid", "email", "profile" }
    });
});

// 🎯 Existing configs (unchanged)
builder.Services.AddResponseCompression();
builder.Services.AddProblemDetails();
builder.Services.AddLogs(builder);
builder.Services.AddMemoryCache();
builder.Services.AddResponseCaching(options => { options.UseCaseSensitivePaths = true; });

builder.Logging.AddOpenTelemetry(logging =>
{
    logging.IncludeScopes = true;
    logging.SetResourceBuilder(ResourceBuilder.CreateDefault().AddService("core.thalos.bff.api"))
           .AddConsoleExporter();
});

builder.Host.ConfigureServices((context, services) =>
{
    services.AddHsts(options =>
    {
        options.Preload = true;
        options.IncludeSubDomains = true;
        options.MaxAge = TimeSpan.FromDays(60);
    });

    services.AddHttpsRedirection(options => { options.RedirectStatusCode = 308; });
    services.AddAntiforgery();
    services.AddHttpLogging(http => http.CombineLogs = true);
    services.AddCors(options => options.AddPolicy("AllowAll", policy => policy.AllowAnyOrigin().AllowAnyHeader().AllowAnyMethod()));

    services.AddMvc().AddJsonOptions(opt =>
    {
        opt.JsonSerializerOptions.WriteIndented = true;
        opt.JsonSerializerOptions.MaxDepth = 20;
        opt.JsonSerializerOptions.NumberHandling = System.Text.Json.Serialization.JsonNumberHandling.AllowNamedFloatingPointLiterals;
    });

    services.Configure<BrotliCompressionProviderOptions>(opt => opt.Level = CompressionLevel.SmallestSize);
    services.Configure<GzipCompressionProviderOptions>(opt => opt.Level = CompressionLevel.SmallestSize);
    services.AddResponseCompression(opt =>
    {
        opt.EnableForHttps = true;
        opt.Providers.Add<BrotliCompressionProvider>();
        opt.Providers.Add<GzipCompressionProvider>();
    });

    services.AddControllers();
    services.AddHttpContextAccessor();
    services.AddTransient<TrackingMechanismExtension>();
    services.RegisterExternalLayer(builder.Configuration);

    services.AddApiVersioning(options => options.ReportApiVersions = true)
           .AddApiExplorer(opt =>
           {
               opt.GroupNameFormat = "'v'VVV";
               opt.SubstituteApiVersionInUrl = true;
           });
});

builder.Services.AddScoped<ITokenService, TokenService>();

var app = builder.Build();

app.UseDeveloperExceptionPage();

app.UseSwagger();

app.UseCors(options => options.AllowAnyOrigin().AllowAnyHeader().AllowAnyMethod().WithOrigins("https://localhost:7239"));
app.UseSwaggerUI(options =>
{
    foreach (var version in app.DescribeApiVersions().Select(v => v.GroupName))
        options.SwaggerEndpoint($"/swagger/{version}/swagger.json", version);

    options.DisplayRequestDuration();
    options.EnableTryItOutByDefault();
    options.DocExpansion(DocExpansion.None);

    options.OAuthClientId(googleClientId);
    options.OAuthClientSecret(googleClientSecret);
    options.OAuthUsePkce();
    options.OAuthScopes("openid", "email", "profile");
});

app.UseResponseCompression();
app.UseResponseCaching();
app.UseHttpsRedirection();

app.UseAuthentication();
app.UseAuthorization();
app.MapControllers();
app.UseHsts();
app.UseAntiforgery();
app.UseLogging(builder.Configuration);
app.Run();