using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Identity;
using Oqtane.Enums;
using Oqtane.Extensions;
using Oqtane.Infrastructure;
using Oqtane.Models;
using Oqtane.Repository;
using Oqtane.Security;
using Oqtane.Shared;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Reflection;
using System.Threading.Tasks;
using SZUAbsolventenverein.Module.AdminModules.Models;
using SZUAbsolventenverein.Module.AdminModules.Repository;

namespace SZUAbsolventenverein.Module.AdminModules.Services
{
    public class ServerAdminModulesService : IAdminModulesService
    {
        private readonly IAdminModulesRepository _AdminModulesRepository;
        private readonly UserManager<IdentityUser> _identityUserManager;
        private readonly IUserPermissions _userPermissions;
        private readonly IRoleRepository _roleRepository;
        private readonly IUserRepository _userRepository;
        private readonly IUserRoleRepository _userRoleRepository;
        private readonly INotificationRepository _notifications;
        private readonly ILogManager _logger;
        private readonly IHttpContextAccessor _accessor;
        private readonly Alias _alias;

        public ServerAdminModulesService(IAdminModulesRepository AdminModulesRepository, UserManager<IdentityUser> identityUserManager, INotificationRepository notifications, IUserPermissions userPermissions, IRoleRepository roleRepository, IUserRepository userRepository, IUserRoleRepository userRoleRepository, ITenantManager tenantManager, ILogManager logger, IHttpContextAccessor accessor)
        {
            _AdminModulesRepository = AdminModulesRepository;
            _identityUserManager = identityUserManager;
            _userPermissions = userPermissions;
            _roleRepository = roleRepository;
            _userRepository = userRepository;   
            _userRoleRepository = userRoleRepository;
            _notifications = notifications;
            _logger = logger;
            _accessor = accessor;
            _alias = tenantManager.GetAlias();
        }

        public Task<List<Models.AdminModules>> GetAdminModulessAsync(int ModuleId)
        {
            if (_userPermissions.IsAuthorized(_accessor.HttpContext.User, _alias.SiteId, EntityNames.Module, ModuleId, PermissionNames.View))
            {
                return Task.FromResult(_AdminModulesRepository.GetAdminModuless(ModuleId).ToList());
            }
            else
            {
                _logger.Log(LogLevel.Error, this, LogFunction.Security, "Unauthorized AdminModules Get Attempt {ModuleId}", ModuleId);
                return null;
            }
        }

        public Task<Models.AdminModules> GetAdminModulesAsync(int AdminModulesId, int ModuleId)
        {
            if (_userPermissions.IsAuthorized(_accessor.HttpContext.User, _alias.SiteId, EntityNames.Module, ModuleId, PermissionNames.View))
            {
                return Task.FromResult(_AdminModulesRepository.GetAdminModules(AdminModulesId));
            }
            else
            {
                _logger.Log(LogLevel.Error, this, LogFunction.Security, "Unauthorized AdminModules Get Attempt {AdminModulesId} {ModuleId}", AdminModulesId, ModuleId);
                return null;
            }
        }

        public Task<Models.AdminModules> AddAdminModulesAsync(Models.AdminModules AdminModules)
        {
            if (_userPermissions.IsAuthorized(_accessor.HttpContext.User, _alias.SiteId, EntityNames.Module, AdminModules.ModuleId, PermissionNames.Edit))
            {
                AdminModules = _AdminModulesRepository.AddAdminModules(AdminModules);
                _logger.Log(LogLevel.Information, this, LogFunction.Create, "AdminModules Added {AdminModules}", AdminModules);
            }
            else
            {
                _logger.Log(LogLevel.Error, this, LogFunction.Security, "Unauthorized AdminModules Add Attempt {AdminModules}", AdminModules);
                AdminModules = null;
            }
            return Task.FromResult(AdminModules);
        }

        public Task<Models.AdminModules> UpdateAdminModulesAsync(Models.AdminModules AdminModules)
        {
            if (_userPermissions.IsAuthorized(_accessor.HttpContext.User, _alias.SiteId, EntityNames.Module, AdminModules.ModuleId, PermissionNames.Edit))
            {
                AdminModules = _AdminModulesRepository.UpdateAdminModules(AdminModules);
                _logger.Log(LogLevel.Information, this, LogFunction.Update, "AdminModules Updated {AdminModules}", AdminModules);
            }
            else
            {
                _logger.Log(LogLevel.Error, this, LogFunction.Security, "Unauthorized AdminModules Update Attempt {AdminModules}", AdminModules);
                AdminModules = null;
            }
            return Task.FromResult(AdminModules);
        }

        public Task DeleteAdminModulesAsync(int AdminModulesId, int ModuleId)
        {
            if (_userPermissions.IsAuthorized(_accessor.HttpContext.User, _alias.SiteId, EntityNames.Module, ModuleId, PermissionNames.Edit))
            {
                _AdminModulesRepository.DeleteAdminModules(AdminModulesId);
                _logger.Log(LogLevel.Information, this, LogFunction.Delete, "AdminModules Deleted {AdminModulesId}", AdminModulesId);
            }
            else
            {
                _logger.Log(LogLevel.Error, this, LogFunction.Security, "Unauthorized AdminModules Delete Attempt {AdminModulesId} {ModuleId}", AdminModulesId, ModuleId);
            }
            return Task.CompletedTask;
        }

        public Task<List<Role>> GetRoles(int ModuleId)
        {
            if (_userPermissions.IsAuthorized(_accessor.HttpContext.User, _alias.SiteId, EntityNames.Module, ModuleId, PermissionNames.View))
            {
                List<Role> role = new();
                role.AddRange(_roleRepository.GetRoles(_alias.SiteId));
                return Task.FromResult(role);
            }
            else
            {
                _logger.Log(LogLevel.Error, this, LogFunction.Security, "Unauthorized AdminModules Get Roles Attempt {ModuleId}", ModuleId);
                return null;
            }
        }

        public Task<EmailFields> PostUsercountInRole(EmailFields EmailFields)
        {
            if (_userPermissions.IsAuthorized(_accessor.HttpContext.User, _alias.SiteId, EntityNames.Module, EmailFields.ModuleId, PermissionNames.View))
            {
                EmailFields ef = new EmailFields { UserCount = _userRoleRepository.GetUserRoles(EmailFields.Role.Name, _alias.SiteId).Select(ur => ur.UserId).Distinct().Count() };
                return Task.FromResult(ef);
            }
            else
            {
                _logger.Log(LogLevel.Error, this, LogFunction.Security, "Unauthorized AdminModules Get Roles Attempt {AdminModulesId} {ModuleId}", EmailFields.AdminModulesId, EmailFields.ModuleId);
                return null;
            }
        }

        public async Task<EmailFields> SendMassNotification(EmailFields EmailFields)
        {
            if (_userPermissions.IsAuthorized(_accessor.HttpContext.User, _alias.SiteId, EntityNames.Module, EmailFields.ModuleId, PermissionNames.View))
            {
                Models.AdminModules template = await GetAdminModulesAsync(EmailFields.AdminModulesId, EmailFields.ModuleId);

                int emailsSent = 0;
                
                IEnumerable<int> userids = _userRoleRepository
                    .GetUserRoles(EmailFields.Role.Name, _alias.SiteId)
                    .Select(ur => ur.UserId)
                    .Distinct()
                    .AsEnumerable();

                Console.WriteLine("Should send emails to: " + userids.Count());

                foreach (int userid in userids)
                {
                    Console.WriteLine("Sending email to: " + userid);
                    emailsSent++;

                    User user = _userRepository.GetUser(userid);
                    IdentityUser identityuser = await _identityUserManager.FindByNameAsync(user.Username);
                    string body = template.Content;

                    // Fields befüllen.
                    string token = await _identityUserManager.GeneratePasswordResetTokenAsync(identityuser);
                    string url = _alias.Protocol + _alias.Name + "/reset?name=" + user.Username + "&token=" + WebUtility.UrlEncode(token);

                    body = body.Replace("[UserDisplayName]", user.DisplayName);
                    body = body.Replace("[URL]", url);

                    Notification notification = new Notification(_alias.SiteId, user, template.Name, body, DateTime.UtcNow.AddDays(emailsSent / 100));
                    _notifications.AddNotification(notification);
                }
                
                return null;
            }
            else
            {
                _logger.Log(LogLevel.Error, this, LogFunction.Security, "Unauthorized AdminModules Get Roles Attempt {AdminModulesId} {ModuleId}", EmailFields.AdminModulesId, EmailFields.ModuleId);
                return null;
            }
        }
    }
}