using System;
using System.Text;
using System.Threading.Tasks;
using API.Constants;
using API.Data;
using API.Entities;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.AspNetCore.Identity;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.IdentityModel.Tokens;

namespace API.Extensions;
#nullable enable

public static class IdentityServiceExtensions
{
    public static IServiceCollection AddIdentityServices(this IServiceCollection services, IConfiguration config)
    {
        services.Configure<IdentityOptions>(options =>
        {
            options.User.AllowedUserNameCharacters =
                "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-._@+/";
        });

        services.AddIdentityCore<AppUser>(opt =>
            {
                opt.Password.RequireNonAlphanumeric = false;
                opt.Password.RequireDigit = false;
                opt.Password.RequireDigit = false;
                opt.Password.RequireLowercase = false;
                opt.Password.RequireUppercase = false;
                opt.Password.RequireNonAlphanumeric = false;
                opt.Password.RequiredLength = 6;

                opt.SignIn.RequireConfirmedEmail = false;

                opt.Lockout.AllowedForNewUsers = true;
                opt.Lockout.DefaultLockoutTimeSpan = TimeSpan.FromMinutes(10);
                opt.Lockout.MaxFailedAccessAttempts = 5;

            })
            .AddTokenProvider<DataProtectorTokenProvider<AppUser>>(TokenOptions.DefaultProvider)
            .AddRoles<AppRole>()
            .AddRoleManager<RoleManager<AppRole>>()
            .AddSignInManager<SignInManager<AppUser>>()
            .AddRoleValidator<RoleValidator<AppRole>>()
            .AddEntityFrameworkStores<DataContext>();


        services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
            .AddJwtBearer(options =>
            {
                options.TokenValidationParameters = new TokenValidationParameters()
                {
                    ValidateIssuerSigningKey = true,
                    IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(config["TokenKey"]!)),
                    ValidateIssuer = false,
                    ValidateAudience = false,
                    ValidIssuer = "Kavita"
                };

                options.Events = new JwtBearerEvents()
                {
                    OnMessageReceived = context =>
                    {
                        var accessToken = context.Request.Query["access_token"];
                        var path = context.HttpContext.Request.Path;
                        // Only use query string based token on SignalR hubs
                        if (!string.IsNullOrEmpty(accessToken) && path.StartsWithSegments("/hubs"))
                        {
                            context.Token = accessToken;
                        }

                        return Task.CompletedTask;
                    }
                };
            });
        services.AddAuthorization(opt =>
        {
            opt.AddPolicy("RequireAdminRole", policy => policy.RequireRole(PolicyConstants.AdminRole));
            opt.AddPolicy("RequireDownloadRole", policy => policy.RequireRole(PolicyConstants.DownloadRole, PolicyConstants.AdminRole));
            opt.AddPolicy("RequireChangePasswordRole", policy => policy.RequireRole(PolicyConstants.ChangePasswordRole, PolicyConstants.AdminRole));
        });

        return services;
    }
}