using System.Net;
using Eis.Infrastructure.Authentication;
using Eis.Infrastructure.Administration;
using Eis.Infrastructure.Candidate;
using Eis.Application.Public;
using Eis.Infrastructure;
using Eis.Infrastructure.Data;
using Eis.Infrastructure.Migration;
using Eis.Infrastructure.Security;
using Eis.Web.Configuration;
using Eis.Web.Authentication;
using Eis.Web.Administration;
using Eis.Web.Candidate;
using Eis.Web.Frontend;
using Eis.Web.Legacy;
using Eis.Web.Public;

var applicationRoot = ApplicationPaths.FindApplicationRoot();
EnvironmentFile.Load(applicationRoot);
var builder = WebApplication.CreateBuilder(args);

builder.WebHost.ConfigureKestrel(options => options.AddServerHeader = false);
builder.Services.Configure<LegacyNodeOptions>(builder.Configuration.GetSection(LegacyNodeOptions.SectionName));
builder.Services.AddHttpClient<LegacyApiProxy>((services, client) =>
{
    var options = services.GetRequiredService<Microsoft.Extensions.Options.IOptions<LegacyNodeOptions>>().Value;
    client.BaseAddress = options.BaseUrl;
    client.Timeout = TimeSpan.FromSeconds(30);
    client.DefaultRequestHeaders.UserAgent.ParseAdd("Eis.AspNetCore.Migration/1.0");
}).ConfigurePrimaryHttpMessageHandler(() => new SocketsHttpHandler
{
    AllowAutoRedirect = false,
    AutomaticDecompression = DecompressionMethods.None,
    UseCookies = false
});
builder.Services.AddProblemDetails();
builder.Services.AddSingleton<IPublicSiteConfiguration, PublicSiteConfiguration>();
var authenticationOptions = AuthenticationOptions.FromEnvironment(
    builder.Environment.IsProduction(),
    builder.Configuration.GetValue<bool>("AuthenticationMigration:NativeEnabled"));
var candidateMigrationOptions = CandidateMigrationOptions.FromEnvironment(
    builder.Configuration.GetValue<bool>("CandidateMigration:NativeEnabled"),
    authenticationOptions.NativeEnabled,
    authenticationOptions.SharesLegacySessions);
var adminMigrationOptions = AdminMigrationOptions.FromEnvironment(
    builder.Configuration.GetValue<bool>("AdminMigration:NativeReadsEnabled"),
    authenticationOptions.NativeEnabled,
    authenticationOptions.SharesLegacySessions,
    builder.Configuration.GetValue<bool>("AdminMigration:NativeOrganizationWritesEnabled"));
builder.Services.AddEisInfrastructure(
    DatabaseOptions.FromEnvironment(applicationRoot, builder.Environment.IsProduction()),
    DocumentVerificationOptions.FromEnvironment(builder.Environment.IsProduction()),
    authenticationOptions,
    candidateMigrationOptions,
    adminMigrationOptions);

var app = builder.Build();
app.Services.EnsureNativeAuthenticationReady(authenticationOptions);

app.UseExceptionHandler();
app.Use(async (context, next) =>
{
    context.Response.Headers.XContentTypeOptions = "nosniff";
    context.Response.Headers.XFrameOptions = "DENY";
    context.Response.Headers["Referrer-Policy"] = "same-origin";
    await next();
});

app.MapGet("/health/live", () => Results.Json(new
{
    status = "healthy",
    service = "Eis.Web",
    framework = ".NET 10"
}));

app.MapGet("/health/migration", async (LegacyApiProxy proxy, CancellationToken cancellationToken) =>
{
    var legacyAvailable = await proxy.IsAvailableAsync(cancellationToken);
    var statusCode = legacyAvailable ? StatusCodes.Status200OK : StatusCodes.Status503ServiceUnavailable;
    return Results.Json(new
    {
        status = legacyAvailable ? "healthy" : "degraded",
        legacyApiAvailable = legacyAvailable,
        authentication = new
        {
            nativeEnabled = authenticationOptions.NativeEnabled,
            stateBackend = authenticationOptions.UsesRedis ? "redis" : "memory",
            sharesLegacySessions = authenticationOptions.SharesLegacySessions
        },
        candidate = new
        {
            nativeEnabled = candidateMigrationOptions.NativeEnabled,
            nativeRoutes = candidateMigrationOptions.NativeEnabled
                ? new[]
                {
                    "GET dashboard", "GET notices", "GET/PUT profile", "GET exams", "GET/POST registrations",
                    "GET results", "POST result appeals", "GET admit cards", "GET admissions", "PUT admission preferences"
                }
                : []
        },
        administration = new
        {
            nativeReadsEnabled = adminMigrationOptions.NativeReadsEnabled,
            nativeOrganizationWritesEnabled = adminMigrationOptions.NativeOrganizationWritesEnabled,
            nativeRoutes = (adminMigrationOptions.NativeReadsEnabled
                    ? new[] { "GET context", "GET dashboard", "GET schools", "GET school-organization", "GET admins", "GET exams" }
                    : [])
                .Concat(adminMigrationOptions.NativeOrganizationWritesEnabled
                    ? new[]
                    {
                        "POST/PATCH schools", "POST/PATCH classes", "POST/PATCH admins",
                        "POST admin password reset", "PUT self-registration setting"
                    }
                    : [])
                .ToArray()
        },
        features = MigrationFeatureCatalog.Current(authenticationOptions.NativeEnabled, candidateMigrationOptions.NativeEnabled)
    }, statusCode: statusCode);
});

app.MapNativePublicEndpoints();
app.MapNativeAuthenticationEndpoints(authenticationOptions);
app.MapNativeCandidateEndpoints(candidateMigrationOptions);
app.MapNativeAdminReadEndpoints(adminMigrationOptions);

string[] methods =
[
    HttpMethods.Get,
    HttpMethods.Head,
    HttpMethods.Post,
    HttpMethods.Put,
    HttpMethods.Patch,
    HttpMethods.Delete,
    HttpMethods.Options
];
app.MapMethods("/api/{**path}", methods, (HttpContext context, LegacyApiProxy proxy) => proxy.ForwardAsync(context));

app.MapFrontendAssets();

app.Run();

public partial class Program;