using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace bnhtrade.Core.Model.Account
{
    public interface IInvoiceHeader
    {
        string ContactName { get; set; }
        bool ContactNameIsSet { get; }
        decimal InvoiceAmount { get; set; }
        bool InvoiceAmountIsSet { get; }
        string InvoiceCurrencyCode { get; set; }
        bool InvoiceCurrencyCodeIsSet { get; }
        DateTime InvoiceDate { get; set; }
        bool InvoiceDateIsSet { get; }
        DateTime InvoiceDueDate { get; set; }
        bool InvoiceDueDateIsSet { get; }
        DateTimeKind InvoiceDateKind { get; set; }
        bool InvoiceDateKindIsSet { get; }
        string InvoiceNumber { get; set; }
        bool InvoiceNumberIsSet { get; }
        string InvoiceReference { get; set; }
        bool InvoiceReferenceIsSet { get; }
        bool IsCreditNote { get; set; }
        bool IsCreditNoteIsSet { get; }
    }

    public abstract class InvoiceHeader : IInvoiceHeader
    {
        private string invoiceCurrencyCode;
        private DateTime? invoiceDate;
        private DateTime? invoiceDueDate;
        private DateTimeKind? invoiceDateKind = DateTimeKind.Utc;
        private decimal? invoiceAmount;

        public InvoiceHeader()
        {
            IsCreditNote = false;
        }

        public string ContactName { get; set; }

        public bool ContactNameIsSet
        {
            get { return ContactName != null; }
        }

        public DateTime InvoiceDate
        {
            get { return (DateTime)invoiceDate.GetValueOrDefault(); }
            set { invoiceDate = value; }
        }

        public bool InvoiceDateIsSet
        {
            get { return invoiceDate != null; }
        }

        public DateTime InvoiceDueDate
        {
            get { return (DateTime)invoiceDueDate.GetValueOrDefault(); }
            set { invoiceDueDate = value; }
        }

        public bool InvoiceDueDateIsSet
        {
            get { return invoiceDueDate != null; }
        }

        public DateTimeKind InvoiceDateKind
        {
            get { return (DateTimeKind)invoiceDateKind; }
            set { invoiceDateKind = value; }
        }

        public bool InvoiceDateKindIsSet
        {
            get { return invoiceDateKind != null; }
        }

        public string InvoiceCurrencyCode
        {
            get { return invoiceCurrencyCode; }
            set
            {
                if (!string.IsNullOrWhiteSpace(value))
                {
                    invoiceCurrencyCode = value.ToUpper();
                }
            }
        }

        public bool InvoiceCurrencyCodeIsSet
        {
            get { return InvoiceCurrencyCode != null; }
        }

        public string InvoiceNumber { get; set; }

        public bool InvoiceNumberIsSet
        {
            get { return InvoiceNumber != null; }
        }

        public string InvoiceReference { get; set; }

        public bool InvoiceReferenceIsSet
        {
            get { return InvoiceReference != null; }
        }

        public decimal InvoiceAmount
        {
            get { return (decimal)invoiceAmount; }
            set { invoiceAmount = value; }
        }

        public bool InvoiceAmountIsSet
        {
            get { return invoiceAmount != null; }
        }
        public bool IsCreditNote
        {
            get;
            set;
        }
        public bool IsCreditNoteIsSet 
        { 
            get { return true; }
        }
    }
}