Testable Applications

using System;
using System.Collections.Generic;
using System.Text;
using System.Data.SqlClient;
using System.Data;
using TestableApplication.Testable.Dalc;

namespace TestableApplication.Testable
{
    public partial class Invoice : IInvoice
    {
        private ICustomer _customer;
        public ICustomer Customer
        {
            get { return _customer; }

        }

        private IInvoiceDalc _invoiceDalc;
        public IInvoiceDalc InvoiceDalc
        {
            get
            {
                if (_invoiceDalc == null) _invoiceDalc = new InvoiceDalc(this);

                return _invoiceDalc;
            }
#if DEBUG
            set
            {
                this._invoiceDalc = value;
            }
#endif
        }

        private int _invoiceNumber;
        public int InvoiceNumber
        {
            get { return _invoiceNumber; }
            set { _invoiceNumber = value; }
        }



        DateTime _issueDate;
        public DateTime IssueDate
        {
            get { return _issueDate; }
            set { _issueDate = value; }
        }



        string _description;
        public string Description
        {
            get { return _description; }

        }
        internal Status _status;
        public Status Status
        {
            get
            {
                return _status;
            }

        }

        public DateTime DueDate
        {
            get { return _issueDate.AddMonths(1); }

        }
        List<InvoiceItem> _items;




        public List<InvoiceItem> Items
        {
            get
            {
                if (_items == null) _items = new List<InvoiceItem>();
                return _items;
            }
            set { _items = value; }
        }

        public Invoice(int invoiceNumber, string description, ICustomer customer)
        {
            this._invoiceNumber = invoiceNumber;
            this._description = description;
            this._customer = customer;

        }

        public Invoice(int invoiceNumber, string description, ICustomer customer, DateTime issueDate, Status status, List<InvoiceItem> items)
            : this(invoiceNumber, description, customer)
        {

            this._items = items;
            this._issueDate = issueDate;
            this._status = status;
        }

        public Invoice()
        {

        }

        public Invoice IssueInvoice(string description, ICustomer customer, List<InvoiceItem> items)
        {
            Console.WriteLine("--- IssueInvoice Method was invoked from object {0} ", this);
            Console.WriteLine("press enter to continue ....");
            Console.ReadLine();

            return this.InvoiceDalc.IssueInvoice(description, customer, items);

        }
        public void PayOffInvoice(ICustomer customer)
        {
            Console.WriteLine("--- PayOffInvoice Method was invoked from object {0} ", this);
            Console.WriteLine("press enter to continue ....");
            Console.ReadLine();

            this.InvoiceDalc.PayOffInvoice(customer);
        }




        public Invoice GetInvoice(int invoiceNomber)
        {
            Console.WriteLine("--- GetInvoice Method was invoked from object {0} ", this);
            Console.WriteLine("press enter to continue ....");
            Console.ReadLine();

            return this.InvoiceDalc.GetInvoice(invoiceNomber);
        }



        public int ItemsCount
        {
            get
            {
                return Items.Count;
            }

        }

        public bool Contains(string itemDescription)
        {
            foreach (InvoiceItem item in Items)
            {
                if (string.Compare(item.Description, itemDescription, true) == 0) return true;
            }
            return false;
        }
        public decimal TotalAmount
        {
            get
            {
                decimal amount = 0;
                foreach (InvoiceItem item in Items)
                {
                    amount += item.Quantity * item.Price;
                }
                return amount;
            }
        }
        public void Update()
        {
            Console.WriteLine("--- Update Method was invoked from object {0} ", this);
            Console.WriteLine("press enter to continue ....");
            Console.ReadLine();

            this.InvoiceDalc.Update();
        }
        public override string ToString()
        {
            return string.Format("{0}-{1}", this.InvoiceNumber, this.Description);
        }

    }
}