namespace EgwCoreLib.Utils
{
    public class DtUtils
    {
        #region Public Enums

        public enum PeriodSet
        {
            Select = 0,
            Today,
            Yesterday,
            LastMonth,
            LastTrim,
            LastWeek,
            LastYear,
            ThisMonth,
            ThisTrim,
            ThisWeek,
            ThisYear
        }

        #endregion Public Enums

        #region Public Classes

        public class Periodo
        {
            #region Public Constructors

            public Periodo()
            { }

            public Periodo(DateTime inizio, DateTime fine)
            {
                this.Inizio = inizio;
                this.Fine = fine;
            }

            public Periodo(PeriodSet tipo)
            {
                int endMonth = 0;
                DateTime oggi = DateTime.Today;
                switch (tipo)
                {
                    case DtUtils.PeriodSet.Today:
                        this.Inizio = oggi;
                        this.Fine = oggi.AddDays(1);
                        break;

                    case DtUtils.PeriodSet.Yesterday:
                        this.Inizio = oggi.AddDays(-1);
                        this.Fine = oggi;
                        break;

                    case DtUtils.PeriodSet.LastMonth:
                        this.Inizio = new DateTime(oggi.Year, oggi.Month, 1).AddMonths(-1);
                        this.Fine = new DateTime(oggi.Year, oggi.Month, 1);
                        break;

                    case DtUtils.PeriodSet.LastTrim:
                        // calcolo trimestre da mese...
                        endMonth = (int)Math.Ceiling((float)oggi.Month / 3) * 3;
                        this.Fine = new DateTime(oggi.Year, endMonth, 1).AddMonths(-2);
                        this.Inizio = this.Fine.AddMonths(-3);
                        break;

                    case DtUtils.PeriodSet.LastYear:
                        this.Fine = new DateTime(oggi.Year, 1, 1);
                        this.Inizio = this.Fine.AddYears(-1);
                        break;

                    case DtUtils.PeriodSet.LastWeek:
                        this.Inizio = oggi.StartOfWeek(DayOfWeek.Monday).AddDays(-7);
                        this.Fine = this.Inizio.AddDays(7);
                        break;

                    case DtUtils.PeriodSet.ThisMonth:
                        this.Inizio = new DateTime(oggi.Year, oggi.Month, 1);
                        this.Fine = this.Inizio.AddMonths(1);
                        break;

                    case DtUtils.PeriodSet.ThisTrim:
                        // calcolo trimestre da mese...
                        endMonth = (int)Math.Ceiling((float)oggi.Month / 3) * 3;
                        this.Fine = new DateTime(oggi.Year, endMonth, 1).AddMonths(1);
                        this.Inizio = this.Fine.AddMonths(-3);
                        break;

                    case DtUtils.PeriodSet.ThisWeek:
                        this.Inizio = oggi.StartOfWeek(DayOfWeek.Monday);
                        this.Fine = this.Inizio.AddDays(7);
                        break;

                    case DtUtils.PeriodSet.ThisYear:
                        this.Inizio = new DateTime(oggi.Year, 1, 1);
                        this.Fine = this.Inizio.AddYears(1);
                        break;

                    case DtUtils.PeriodSet.Select:
                    default:
                        break;
                }
            }

            #endregion Public Constructors

            #region Public Properties

            public DateTime Fine { get; set; } = DateTime.Today.AddDays(+1);

            public DateTime Inizio { get; set; } = DateTime.Today;

            #endregion Public Properties

            #region Public Methods

            public Periodo Clone()
            {
                return new Periodo(this.Inizio, this.Fine);
            }

            public override bool Equals(object? obj)
            {
                if (obj == null)
                    return false;

                if (!(obj is Periodo item))
                    return false;

                if (Inizio != item.Inizio)
                    return false;

                if (Fine != item.Fine)
                    return false;

                return true;
            }

            public override int GetHashCode()
            {
                return base.GetHashCode();
            }

            #endregion Public Methods
        }

        #endregion Public Classes
    }
}