using System;
using System.Collections.Generic;
using System.Linq;
using BeWo.Data;
using BeWo.Data.Access;
using BeWo.Data.Entities;
using BeWo.Service.DCEntityMapper;
using BS.Shared;
using BS.Shared.Core;
using BS.Shared.DataContracts;
using BS.Shared.Extensions;
using NHibernate.Util;

namespace BeWo.Service.Plugins
{
	public class ResourceService : AbstractIDSpecificDefaultClass<ResourceService>
	{

	    public virtual string ValidateSchedulerAppointment(DateTime start, DateTime end, IEnumerable<long> employees, IEnumerable<long> customers, List<long> resources, long originator, long? appointmentOid, Guid? recurrenceId, int occurrenceIndex = 0, bool shouldSkipResourceAvailability = false)
	    {
	        return DAOFactory.SearchDAO.ValidateSchedulerAppointment(start, end, employees, customers, resources, originator, appointmentOid, recurrenceId, occurrenceIndex);
	    }

        public virtual List<ResourceDC> CheckResourceAvailability(DateTime start, DateTime end, List<long> resourceOids, long? selectedAppointmentOid)
        {
            var list = new List<ResourceDC>();
            var resources = DAOFactory.SearchDAO.CheckAvailabilityOfResources(resourceOids, start, end, selectedAppointmentOid);

            foreach(var resource in resources)
            {
                list.AddIfNotIn(MapperFactory.ResourceDC_Resource.MapToNewDC(resource));
            }

            return list;
        }

        public virtual Dictionary<string, List<string>> CheckResourceAvailabilityWithBookingEmployees(DateTime start, DateTime end, List<long> resourceOids, long? selectedAppointmentOid)
        {
            var appointments = DAOFactory.SearchDAO.FindAppointmentsByResourcesInInterval(resourceOids, start, end, selectedAppointmentOid);

            var user = LoggedInUserOperationContextExt.Current?.User ?? SessionFacade.LoggedInUser;

            var result = new Dictionary<string, List<string>>();

            if(user is null)
            {
                return result;
            }

            var loggedInEmployee = user.Employee;

            var hasRightToViewEmployeeAppointments = user.CheckForRight(UserRightType.KalenderMitarbeitertermineAnsehen);
            var hasRightToViewResourceAppointments = user.CheckForRight(UserRightType.KalenderRessourcentermineAnsehen);

            var dictionary = new Dictionary<Resource, List<SchedulerAppointment>>();

            foreach(var appointment in appointments)
            {
                foreach(var resource in appointment.ResourceList)
                {
                    dictionary.AddOrUpdateValueInDictionary(resource, appointment);
                }
            }

            foreach(var resource2Appointments in dictionary)
            {
                foreach(var appointment in resource2Appointments.Value)
                {
                    var originator = appointment.Originator;
                    var employee2Appointments = appointment.EmployeeList;

                    var isOwnAppointment = (originator?.Equals(loggedInEmployee) ?? false) || employee2Appointments.ToList().Any(e2a => e2a.Employee.Equals(loggedInEmployee));

                    // Wenn isOwnAppointment true ist, darf der Benutzer die Uhrzeiten und die Mitarbeiter sehen. Ansonsten müssen die Rechte geprüft werden.
                    if(isOwnAppointment || hasRightToViewEmployeeAppointments) // Es werden Zeit und Mitarbeiter angezeigt
                    {
                        result.AddOrUpdateValueInDictionary(resource2Appointments.Key.Name, $"{CreateDateTimeInfoFromAppointment(appointment.StartDate, appointment.EndDate, appointment.AllDay)} von {originator}");
                    }
                    else if(hasRightToViewResourceAppointments && !hasRightToViewEmployeeAppointments) // Nur die Uhrzeit anzeigen
                    {
                        result.AddOrUpdateValueInDictionary(resource2Appointments.Key.Name, $"{CreateDateTimeInfoFromAppointment(appointment.StartDate, appointment.EndDate, appointment.AllDay)}");
                    }
                    else if(!hasRightToViewEmployeeAppointments) // Es werden weder Zeit noch Mitarbeiter angezeigt
                    {
                        result.AddOrUpdateValueInDictionary(resource2Appointments.Key.Name, string.Empty);
                    }
                }
            }

            return result;
        }

        private string CreateDateTimeInfoFromAppointment(DateTime? start, DateTime? end, bool allDay)
        {
            if(start.HasValue && end.HasValue)
            {
                return start.Value.Date == end.Value.Date ?
                    $"{start.Value.ToShortTimeString()} - {end.Value.ToShortTimeString()} " :
                    $"{start.Value:dd.MM.yyyy HH:mm} - {end.Value:dd.MM.yyyy HH:mm} ";
            }

            if(allDay && start.HasValue && end.HasValue)
            {
                return start.Value.Date == end.Value.Date ? " " : $"{start.Value.ToShortDateString()} - {end.Value.ToShortDateString()} ";
            }

            return string.Empty;
        }
    }
}