using System;
using System.Diagnostics;
using System.Text;

using Fab2ApprovalSystem.Misc;
using Fab2ApprovalSystem.Models;
using Fab2ApprovalSystem.Services;

using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.ViewEngines;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Hosting.WindowsServices;
using Microsoft.Extensions.Logging;
using Microsoft.IdentityModel.Tokens;

namespace Fab2ApprovalMKLink;

public class Program {

    public static int Main(string[] args) {
        ILogger<Program>? logger = null;
        WebApplicationBuilder webApplicationBuilder = WebApplication.CreateBuilder(args);
        _ = webApplicationBuilder.Configuration.AddUserSecrets<Program>();
        AppSettings appSettings = AppSettings.Get(webApplicationBuilder.Configuration);
        if (string.IsNullOrEmpty(appSettings.Company))
            throw new Exception("Company name must have a value!");
        if (string.IsNullOrEmpty(appSettings.WorkingDirectoryName))
            throw new Exception("Working directory name must have a value!");
        GlobalVars.AppSettings = appSettings;
        GlobalVars.AttachmentUrl = appSettings.AttachmentUrl is null ? string.Empty : appSettings.AttachmentUrl;
        GlobalVars.CA_BlankFormsLocation = appSettings.CABlankFormsLocation;
        GlobalVars.DBConnection = appSettings.DBConnection;
        GlobalVars.DB_CONNECTION_STRING = appSettings.DBConnectionString;
        GlobalVars.hostURL = appSettings.HostURL;
        GlobalVars.IS_INFINEON_DOMAIN = appSettings.IsInfineonDomain;
        GlobalVars.MesaTemplateFiles = appSettings.MesaTemplateFiles;
        GlobalVars.NDriveURL = appSettings.NDriveURL;
        GlobalVars.SENDER_EMAIL = appSettings.SenderEmail;
        GlobalVars.USER_ID = appSettings.UserId;
        GlobalVars.USER_ISADMIN = appSettings.UserIsAdmin;
        GlobalVars.WSR_URL = appSettings.WSR_URL;
        try {
            _ = webApplicationBuilder.Services.Configure<ApiBehaviorOptions>(options => options.SuppressModelStateInvalidFilter = true);
            _ = webApplicationBuilder.Services.AddControllers();
            _ = webApplicationBuilder.Services.AddControllersWithViews();
            _ = webApplicationBuilder.Services.AddDistributedMemoryCache();
            _ = webApplicationBuilder.Services.AddHttpClient();
            _ = webApplicationBuilder.Services.AddMemoryCache();
            _ = webApplicationBuilder.Services.AddSingleton(_ => appSettings);
            _ = webApplicationBuilder.Services.AddSingleton<ICompositeViewEngine, CompositeViewEngine>();
            // _ = webApplicationBuilder.Services.AddTransient<IViewRenderingService, ViewRenderingService>();
            // _ = webApplicationBuilder.Services.AddScoped<IViewRenderService, ViewRenderService>();
            // _ = webApplicationBuilder.Services.AddSingleton<ITempDataProvider, ITempDataProvider>();
            _ = webApplicationBuilder.Services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
            _ = webApplicationBuilder.Services.AddScoped<IAuthenticationService, AuthenticationService>();
            _ = webApplicationBuilder.Services.AddScoped<IDalService, DalService>();
            _ = webApplicationBuilder.Services.AddScoped<IDbConnectionService, DbConnectionService>();
            _ = webApplicationBuilder.Services.AddScoped<IUserService, UserService>();
            _ = webApplicationBuilder.Services.AddSwaggerGen();
            _ = webApplicationBuilder.Services.AddSession(sessionOptions => {
                sessionOptions.IdleTimeout = TimeSpan.FromSeconds(2000);
                sessionOptions.Cookie.HttpOnly = true;
                sessionOptions.Cookie.IsEssential = true;
            }
            );

            _ = webApplicationBuilder.Services.AddAuthentication(options => {
                options.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
                options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
            })
            .AddJwtBearer(options => {
                options.RequireHttpsMetadata = false;
                options.SaveToken = true;
                options.TokenValidationParameters = new TokenValidationParameters {
                    ValidateIssuerSigningKey = true,
                    ValidIssuer = appSettings.JwtIssuer,
                    ValidateAudience = false,
                    IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(appSettings.JwtKey)),
                    ClockSkew = TimeSpan.Zero
                };
            });

            _ = webApplicationBuilder.Services.AddAuthorization(options => {
                options.DefaultPolicy = new AuthorizationPolicyBuilder()
                                            .AddAuthenticationSchemes(JwtBearerDefaults.AuthenticationScheme)
                                            .RequireAuthenticatedUser()
                                            .Build();
            });
            if (WindowsServiceHelpers.IsWindowsService()) {
                _ = webApplicationBuilder.Services.AddSingleton<IHostLifetime, WindowsServiceLifetime>();
                _ = webApplicationBuilder.Logging.AddEventLog(settings => {
#pragma warning disable CA1416
                    if (string.IsNullOrEmpty(settings.SourceName))
                        settings.SourceName = webApplicationBuilder.Environment.ApplicationName;
#pragma warning restore
                });
            }
            WebApplication webApplication = webApplicationBuilder.Build();
            if (Debugger.IsAttached)
                webApplication.Services.GetRequiredService<AppSettings>();
            logger = webApplication.Services.GetRequiredService<ILogger<Program>>();
            _ = webApplication.UseCors(corsPolicyBuilder => corsPolicyBuilder.AllowAnyOrigin().AllowAnyHeader().AllowAnyMethod());
            if (!webApplicationBuilder.Environment.IsDevelopment()) {
                _ = webApplication.UseExceptionHandler("/Error");
                _ = webApplication.UseHttpsRedirection();
                _ = webApplication.UseHsts();
            } else {
                if (string.IsNullOrEmpty(appSettings.URLs)) {
                    Environment.ExitCode = -1;
                    webApplication.Lifetime.StopApplication();
                }
                _ = webApplication.UseSwagger();
                _ = webApplication.UseSwaggerUI(c => c.SwaggerEndpoint("/swagger/v1/swagger.json", "Server V1"));
            }
            _ = webApplication.UseSession();
            _ = webApplication.MapControllers();
            _ = webApplication.UseAuthentication();
            _ = webApplication.UseAuthorization();
            logger.LogInformation("Starting Web Application");
            webApplication.Run();
            return 0;
        } catch (Exception ex) {
            try { logger?.LogCritical(ex, "Host terminated unexpectedly"); } catch (Exception) { }
            throw;
        }
    }

}