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

namespace SZUAbsolventenverein.Module.EventRegistration.Services
{
    public class ServerEventRegistrationService : IEventRegistrationService
    {
        private readonly IEventRepository _EventRepository;
        private readonly IResponseRepository _ResponseRepository;
        private readonly INotificationRepository _NotificationRepository;
        private readonly IUserRepository _UserRepository;
        private readonly IUserPermissions _userPermissions;
        private readonly ILogManager _logger;
        private readonly IHttpContextAccessor _accessor;
        private readonly Alias _alias;

        public ServerEventRegistrationService(IEventRepository EventRepository, IResponseRepository ResponseRepository, INotificationRepository NotificationRepository, IUserRepository UserRepository, IUserPermissions userPermissions, ITenantManager tenantManager, ILogManager logger, IHttpContextAccessor accessor)
        {
            _EventRepository = EventRepository;
            _ResponseRepository = ResponseRepository;
            _NotificationRepository = NotificationRepository;
            _UserRepository = UserRepository;
            _userPermissions = userPermissions;
            _logger = logger;
            _accessor = accessor;
            _alias = tenantManager.GetAlias();
        }

        public Task<Event> AddEventAsync(Event NewEvent)
        {
            if (_userPermissions.IsAuthorized(_accessor.HttpContext.User, _alias.SiteId, EntityNames.Module, NewEvent.ModuleId, PermissionNames.Edit))
            {
                NewEvent = _EventRepository.AddEvent(NewEvent);
                _logger.Log(LogLevel.Information, this, LogFunction.Create, "EventRegistration Added {NewEvent}", NewEvent);
            }
            else
            {
                _logger.Log(LogLevel.Error, this, LogFunction.Security, "Unauthorized EventRegistration Add Attempt {NewEvent}", NewEvent);
                NewEvent = null;
            }
            return Task.FromResult(NewEvent);
        }

        public Task<Response> AddResponseAsync(Response Response)
        {
            if (_userPermissions.IsAuthorized(_accessor.HttpContext.User, _alias.SiteId, EntityNames.Module, Response.ModuleId, PermissionNames.View))
            {
                Response = _ResponseRepository.AddResponse(Response);

                Event currentEvent = _EventRepository.GetEvent(Response.EventRegistrationId);
                string subject = Response.ResponseType ? $"Du bist erfolgreich für '{currentEvent.Name}' Registriert worden." : $"Du hast erfolgreich für '{currentEvent.Name}' abgesagt.";
                string body = "Hier kann man die Infos des Events hineinpacken (HTML ist erlaubt)";
                SendEventResponseNotification(subject, body);

                _logger.Log(LogLevel.Information, this, LogFunction.Create, "EventRegistration Added {NewEvent}", Response);
            }
            else
            {
                _logger.Log(LogLevel.Error, this, LogFunction.Security, "Unauthorized EventRegistration Add Attempt {NewEvent}", Response);
                Response = null;
            }
            return Task.FromResult(Response);
        }

        public Task<Response> UpdateResponseAsync(Response Response)
        {

            if (_userPermissions.IsAuthorized(_accessor.HttpContext.User, _alias.SiteId, EntityNames.Module, Response.ModuleId, PermissionNames.View))
            {
                Response = _ResponseRepository.UpdateResponse(Response);

                Event currentEvent = _EventRepository.GetEvent(Response.EventRegistrationId);
                string subject = Response.ResponseType ? $"Du bist erfolgreich für '{currentEvent.Name}' Registriert worden." : $"Du hast erfolgreich für '{currentEvent.Name}' abgesagt.";
                string body = "Hier kann man die Infos des Events hineinpacken (HTML ist erlaubt)";
                SendEventResponseNotification(subject, body);
                
                _logger.Log(LogLevel.Information, this, LogFunction.Create, "EventRegistration Added {NewEvent}", Response);
            }
            else
            {
                _logger.Log(LogLevel.Error, this, LogFunction.Security, "Unauthorized EventRegistration Add Attempt {NewEvent}", Response);
                Response = null;
            }
            return Task.FromResult(Response);
        }

        public Task DeleteEventAsync(int EventId, int ModuleId)
        {
            if (_userPermissions.IsAuthorized(_accessor.HttpContext.User, _alias.SiteId, EntityNames.Module, ModuleId, PermissionNames.Edit))
            {
                _EventRepository.DeleteEvent(EventId);
                _logger.Log(LogLevel.Information, this, LogFunction.Delete, "Event Deleted {EventId}", EventId);
            }
            else
            {
                _logger.Log(LogLevel.Error, this, LogFunction.Security, "Unauthorized Event Delete Attempt {EventId} {ModuleId}", EventId, ModuleId);
            }
            return Task.CompletedTask;
        }

        public Task<Event> GetEventAsync(int EventId, int ModuleId)
        {
            if (_userPermissions.IsAuthorized(_accessor.HttpContext.User, _alias.SiteId, EntityNames.Module, ModuleId, PermissionNames.View))
            {
                return Task.FromResult(_EventRepository.GetEvent(EventId, true));
            }
            else
            {
                _logger.Log(LogLevel.Error, this, LogFunction.Security, "Unauthorized Event Get Attempt {ModuleId}", ModuleId);
                return null;
            }
        }

        public Task<(Event, Response)> GetEventDetails(int EventId, int ModuleId)
        {
            if (_userPermissions.IsAuthorized(_accessor.HttpContext.User, _alias.SiteId, EntityNames.Module, ModuleId, PermissionNames.View))
            {
                Event currentEvent = _EventRepository.GetEvent(EventId);
                Response rsvp = _ResponseRepository.GetResponse(EventId, _accessor.HttpContext.User.UserId());
                return Task.FromResult((currentEvent, rsvp));
            }
            else
            {
                _logger.Log(LogLevel.Error, this, LogFunction.Security, "Unauthorized Event Get Attempt {ModuleId}", ModuleId);
                return null;
            }
        }

        public Task<List<Response>> GetEventResponses(int EventId, int ModuleId)
        {
            if (_userPermissions.IsAuthorized(_accessor.HttpContext.User, _alias.SiteId, EntityNames.Module, ModuleId, PermissionNames.Edit))
            {
                return Task.FromResult(_ResponseRepository.GetResponses(EventId, ModuleId).ToList());
            }
            else
            {
                _logger.Log(LogLevel.Error, this, LogFunction.Security, "Unauthorized Event Response Get Attempt {ModuleId}", ModuleId);
                return null;
            }
            throw new System.NotImplementedException();
        }

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

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

        // TODO: Implement the methods for EventResponses

        /*

        public Task<Models.Event> GetEventRegistrationAsync(int EventRegistrationId, int ModuleId)
        {
            if (_userPermissions.IsAuthorized(_accessor.HttpContext.User, _alias.SiteId, EntityNames.Module, ModuleId, PermissionNames.View))
            {
                return Task.FromResult(_EventRegistrationRepository.GetEventRegistration(EventRegistrationId));
            }
            else
            {
                _logger.Log(LogLevel.Error, this, LogFunction.Security, "Unauthorized EventRegistration Get Attempt {EventRegistrationId} {ModuleId}", EventRegistrationId, ModuleId);
                return null;
            }
        }

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

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

        }*/

        private void SendEventResponseNotification(string subject, string body)
        {
            User user = _UserRepository.GetUser(_accessor.HttpContext.User.UserId());
            Notification notification = new Notification(_alias.SiteId, user, subject, body);
            _NotificationRepository.AddNotification(notification);
        }
    }
}