using CPRNIMS.Domain.UIContracts.Account;
using CPRNIMS.Domain.UIContracts.Canvass;
using CPRNIMS.Domain.UIContracts.CaptCha;
using CPRNIMS.Domain.UIContracts.Common;
using CPRNIMS.Domain.UIContracts.Finance;
using CPRNIMS.Domain.UIContracts.Inventory;
using CPRNIMS.Domain.UIContracts.Items;
using CPRNIMS.Domain.UIContracts.PO;
using CPRNIMS.Domain.UIContracts.PR;
using CPRNIMS.Domain.UIContracts.Receiving;
using CPRNIMS.Domain.UIContracts.SMTP;
using CPRNIMS.Domain.UIServices.Account;
using CPRNIMS.Domain.UIServices.Canvass;
using CPRNIMS.Domain.UIServices.CaptCha;
using CPRNIMS.Domain.UIServices.Common;
using CPRNIMS.Domain.UIServices.Finance;
using CPRNIMS.Domain.UIServices.Inventory;
using CPRNIMS.Domain.UIServices.Items;
using CPRNIMS.Domain.UIServices.PO;
using CPRNIMS.Domain.UIServices.PR;
using CPRNIMS.Domain.UIServices.Receiving;
using CPRNIMS.Domain.UIServices.SMTP;
using CPRNIMS.Infrastructure.Database;
using CPRNIMS.Infrastructure.Helper;
using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Authentication.Cookies;
using Microsoft.AspNetCore.Http.Features;
using Microsoft.EntityFrameworkCore;

namespace CPRNIMS.WebApps.Common
{
    public static class ServiceExtensions
    {
        public static void AddApplicationServices(this IServiceCollection services,
            WebApplicationBuilder builder)
        {
            ConfigureHttpClient(builder);
            AddScopedServices(builder);
            AddSessionAndAuthentication(builder);
            AddDbContext(builder);
            FileSizeHelper(builder);
            CacheUpdater(services);
        }
        private static void CacheUpdater(IServiceCollection services)
        {
            services.AddControllersWithViews().AddRazorRuntimeCompilation();
            services.AddSignalR();
        }

        private static void FileSizeHelper(WebApplicationBuilder builder)
        {
            builder.Services.Configure<FormOptions>(options =>
            {
                options.ValueCountLimit = int.MaxValue;
                options.MultipartBodyLengthLimit = long.MaxValue; 
                options.MemoryBufferThreshold = int.MaxValue;
            });
        }

        private static void ConfigureHttpClient(WebApplicationBuilder builder)
        {
            builder.Services.AddHttpClient("AuthApi", client =>
            {
                client.BaseAddress = new Uri(builder.Configuration["CommonEndpoints:ApiDefaultHeaders:BaseUrl"]);
                //This code block should be removed once deployed in production
            }).ConfigurePrimaryHttpMessageHandler(() => new HttpClientHandler
            {
                ServerCertificateCustomValidationCallback = (sender, cert, chain, sslPolicyErrors) => true
            });
        }

        private static void AddScopedServices(WebApplicationBuilder builder)
        {
            builder.Services.AddHttpContextAccessor(); 
           builder.Services.AddTransient<IApiConfigurationService, ApiConfigurationService>();
            builder.Services.AddScoped<TokenHelper>();
            builder.Services.AddTransient<IItem, Item>();
            builder.Services.AddTransient<IPRequest, PRequest>();
            builder.Services.AddTransient<ICanvass, Canvass>();
            builder.Services.AddTransient<IRR, RR>();
            builder.Services.AddTransient<IReceiving, Receiving>();
            builder.Services.AddTransient<ISMTP, SMTP>();
            builder.Services.AddTransient<IInventory, Inventory>();
            builder.Services.AddTransient<IPurchaseOrder, PurchaseOrder>();
            builder.Services.AddTransient<Domain.UIContracts.Attachment.IAttachment, Domain.UIServices.Attachment.Attachment>();
            builder.Services.AddTransient<IAccount, Account>();
            builder.Services.AddTransient<ICaptchaService, CaptchaService>();
            builder.Services.AddScoped<ErrorLogHelper>();
        }

        private static void AddSessionAndAuthentication(WebApplicationBuilder builder)
        {
            builder.Services.AddDistributedMemoryCache();

            // Configure Session with proper settings
            builder.Services.AddSession(options =>
            {
                options.IdleTimeout = TimeSpan.FromHours(2);
                options.Cookie.Name = ".CPRNIMS.Session";
                options.Cookie.HttpOnly = true;
                options.Cookie.IsEssential = true;
                options.Cookie.SameSite = SameSiteMode.Lax;
                options.Cookie.SecurePolicy = CookieSecurePolicy.SameAsRequest; 
            });

            // Configure Authentication
            builder.Services.AddAuthentication(options =>
            {
                options.DefaultAuthenticateScheme = CookieAuthenticationDefaults.AuthenticationScheme;
                options.DefaultSignInScheme = CookieAuthenticationDefaults.AuthenticationScheme;
                options.DefaultChallengeScheme = CookieAuthenticationDefaults.AuthenticationScheme;
            })
            .AddCookie(options =>
            {
                options.LoginPath = "/Home/Index";
                options.LogoutPath = "/Home/Logout";
                options.AccessDeniedPath = "/Home/AccessDenied";
                options.Cookie.Name = ".CPRNIMS.Auth";

                options.SlidingExpiration = true;
                options.ExpireTimeSpan = TimeSpan.FromHours(2);

                options.Cookie.HttpOnly = true;
                options.Cookie.SameSite = SameSiteMode.Lax;
                options.Cookie.IsEssential = true;
                options.Cookie.SecurePolicy = CookieSecurePolicy.SameAsRequest; 

                options.Events = new CookieAuthenticationEvents
                {
                    OnValidatePrincipal = async context =>
                    {
                        var tokenExpiryClaim = context.Principal?.FindFirst("TokenExpiry");
                        if (tokenExpiryClaim != null)
                        {
                            if (DateTime.TryParse(tokenExpiryClaim.Value, out DateTime expiry))
                            {
                                if (DateTime.UtcNow.AddMinutes(5) >= expiry)
                                {
                                    // Token is expiring soon - trigger refresh
                                    var tokenHelper = context.HttpContext.RequestServices
                                        .GetRequiredService<Infrastructure.Helper.TokenHelper>();

                                    var newToken = await tokenHelper.GetValidTokenAsync();

                                    if (string.IsNullOrEmpty(newToken))
                                    {
                                        context.RejectPrincipal();
                                        await context.HttpContext.SignOutAsync(
                                            CookieAuthenticationDefaults.AuthenticationScheme);
                                    }
                                }
                            }
                        }
                    },

                    OnRedirectToLogin = context =>
                    {
                        if (context.Request.Path.StartsWithSegments("/api"))
                        {
                            context.Response.StatusCode = StatusCodes.Status401Unauthorized;
                        }
                        else
                        {
                            context.Response.Redirect(context.RedirectUri);
                        }
                        return Task.CompletedTask;
                    }
                };
            });
        }

        private static void AddDbContext(WebApplicationBuilder builder)
        {
            builder.Services.AddDbContext<NonInventoryDbContext>(options =>
                options.UseSqlServer(builder.Configuration.GetConnectionString("DefaultConnection")));
        }
    }
}