using System;
using System.Collections.Generic;
using BS.Shared.DataContracts;
using BS.Shared.Extensions;

namespace BS.Shared.Core
{
    public static class SchedulerUtils
    {
        public static List<SchedulerAppointmentDC> GenerateSeveralDaysAppointments(List<SchedulerAppointmentDC> severalDaysAppointments)
        {
            var result = new List<SchedulerAppointmentDC>();

            foreach(var termin in severalDaysAppointments)
            {
                if(termin.StartDate is null || termin.EndDate is null)
                {
                    continue;
                }

                var tage = termin.StartDate.Value.GetDayNumberBetweenTwoDates(termin.EndDate.Value);
                if(tage > 31)
                {
                    tage = 31;
                }

                if(termin.AllDay)
                {
                    tage -= 1;
                }

                if(tage > 0)
                {
                    if(termin.AllDay)
                    {
                        for(var i = 0; i <= tage; i++)
                        {
                            var isAllDay = termin.AllDay;
                            var startDate = new DateTime(termin.StartDate.Value.AddDays(i).Year, termin.StartDate.Value.AddDays(i).Month, termin.StartDate.Value.AddDays(i).Day);
                            var endDate = new DateTime(termin.StartDate.Value.AddDays(i + 1).Year, termin.StartDate.Value.AddDays(i + 1).Month, termin.StartDate.Value.AddDays(i + 1).Day);

                            result.Add(CreateAppointment(isAllDay, startDate, endDate, termin));
                        }
                    }
                    else
                    {
                        for(var i = 0; i <= tage; i++)
                        {
                            if(i == 0)
                            {
                                var startDate = termin.StartDate.Value;
                                var endDate = new DateTime(termin.StartDate.Value.AddDays(1).Year, termin.StartDate.Value.AddDays(1).Month, termin.StartDate.Value.AddDays(1).Day);

                                result.Add(CreateAppointment(false, startDate, endDate, termin));
                            }
                            else if(i == tage)
                            {
                                var startDate = new DateTime(termin.EndDate.Value.Year, termin.EndDate.Value.Month, termin.EndDate.Value.Day);
                                var endDate = termin.EndDate.Value;

                                result.Add(CreateAppointment(false, startDate, endDate, termin));
                            }
                            else
                            {
                                var startDate = new DateTime(termin.StartDate.Value.AddDays(i).Year, termin.StartDate.Value.AddDays(i).Month, termin.StartDate.Value.AddDays(i).Day);
                                var endDate = new DateTime(termin.StartDate.Value.AddDays(i + 1).Year, termin.StartDate.Value.AddDays(i + 1).Month, termin.StartDate.Value.AddDays(i + 1).Day);

                                result.Add(CreateAppointment(true, startDate, endDate, termin));
                            }
                        }
                    }
                }
            }

            return result;
        }

        private static SchedulerAppointmentDC CreateAppointment(bool isAllDay, DateTime startDate, DateTime endDate, SchedulerAppointmentDC appointment)
        {
            return new SchedulerAppointmentDC
            {
                AllDay                   = isAllDay,
                CustomerList             = appointment.CustomerList,
                Description              = appointment.Description,
                EmployeeList             = appointment.EmployeeList,
                EndDate                  = endDate,
                FormerBookingSequenceOid = appointment.FormerBookingSequenceOid,
                IsPrivate                = appointment.IsPrivate,
                LabelKey                 = appointment.LabelKey,
                Location                 = appointment.Location,
                Originator               = appointment.Originator,
                RecurrenceInfo           = appointment.RecurrenceInfo,
                ReminderInfo             = appointment.ReminderInfo,
                ResourceList             = appointment.ResourceList,
                StartDate                = startDate,
                Status                   = appointment.Status,
                Subject                  = appointment.Subject,
                Type                     = appointment.Type,
                ServiceRecordList        = appointment.ServiceRecordList,
                SupportConceptList       = appointment.SupportConceptList
            };
        }
    }
}