using System;
using System.Data;
using System.Collections.Generic;
using System.Collections;
using System.Text;

public class SingleDiscount
{
    public int DiscountID;

    private bool _IsOneTimeDiscount = false;
    private bool _DiscountApplied = false;
    private bool _GrantsFreeShipping = false;
    private bool _AppliesToAllItems = false;
    private decimal _RequiredSubtotal;
    private decimal _DiscountDollarAmount;
    private decimal _DiscountAmount = 0;
    private int _DiscountPercentage;
    private string _DiscountCode;
    private string _DiscountTitle;


    #region accessors
    public string DiscountCode
    {
        get { return _DiscountCode; }
        set { _DiscountCode = value; }
    }

    public bool IsOneTimeDiscount
    {
        get { return _IsOneTimeDiscount; }
        set { _IsOneTimeDiscount = value; }
    }

    public bool DiscountApplied
    {
        get { return _DiscountApplied; }
        set { _DiscountApplied = value; }
    }

    public bool GrantsFreeShipping
    {
        get { return _GrantsFreeShipping; }
        set { _GrantsFreeShipping = value; }
    }

    public bool AppliesToAllItems
    {
        get { return _AppliesToAllItems; }
        set { _AppliesToAllItems = value; }
    }

    public decimal RequiredSubtotal
    {
        get { return _RequiredSubtotal; }
        set { _RequiredSubtotal = value; }
    }

    public decimal DiscountDollarAmount
    {
        get { return _DiscountDollarAmount; }
        set { _DiscountDollarAmount = value; }
    }

    public decimal DiscountAmount
    {
        get { return _DiscountAmount; }
        set { _DiscountAmount = value; }
    }

    public int DiscountPercentage
    {
        get { return _DiscountPercentage; }
        set { _DiscountPercentage = value; }
    }

    public string DiscountTitle
    {
        get { return _DiscountTitle + (!DiscountApplied ? " (NOT APPLIED)" : ""); }
        set { _DiscountTitle = value; }
    }
#endregion

    public void RunDiscount()
    {
        DatabaseClass Database = DatabaseClass.Current;
        ShoppingCart ShoppingCart = ShoppingCart.Current;

        // reset the discount amount
        DiscountAmount = 0;
        
        if (ShoppingCart.SubTotal > this.RequiredSubtotal)
        {
            if (!AppliesToAllItems)
            {
                DataTable dt = Database.DiscountItemMap_GetItemIDsDiscountID(DiscountID);

                int TotalItemsMatched = 0;
                decimal TotalCombinedPrice = 0;
                foreach (DataRow dr in dt.Rows)
                {
                    int ItemID = (int)dr["ItemID"];

                    foreach (ShoppingCartItem sci in ShoppingCart)
                    {
                        if (sci.ItemID == ItemID)
                        {
                            TotalItemsMatched++;
                            TotalCombinedPrice += sci.Price;
                        }
                    }
                }

                if (TotalItemsMatched == 0)
                {
                    DiscountApplied = false;
                }
                else
                {
                    DiscountApplied = true;
                    DiscountAmount += ((DiscountPercentage / 100M) * TotalCombinedPrice); // apply percentage
                    DiscountAmount += DiscountDollarAmount; // apply dollar amount

                    // apply free shipping
                    if (GrantsFreeShipping)
                        ShoppingCart.IsFreeShipping = true;
                }
            }
            else
            {
                // this discount applies to all items, so we dont need to evaluate
                DiscountApplied = true;
                DiscountAmount += ((DiscountPercentage / 100M) * ShoppingCart.SubTotal); //apply percentage
                DiscountAmount += DiscountDollarAmount; // apply dollar amount

                // apply free shipping
                if (GrantsFreeShipping)
                    ShoppingCart.IsFreeShipping = true;
            }
        }
        else
            DiscountApplied = false;
    }
}


public class DiscountList : List<SingleDiscount>
{
    public decimal TotalDiscountAmount;

    public void RemoveByDiscountCode(string DiscountCode)
    {
        SingleDiscount sd = FindByDiscountCode(DiscountCode);

        if (sd != null)
            this.Remove(sd);
    }

    public SingleDiscount FindByDiscountCode(string DiscountCode)
    {
        foreach (SingleDiscount sd in this)
            if (sd.DiscountCode == DiscountCode)
                return sd;

        return null;
    }

    public void RunDiscounts()
    {
        TotalDiscountAmount = 0;
        foreach (SingleDiscount sd in this)
        {
            sd.RunDiscount();
            TotalDiscountAmount += sd.DiscountAmount;
        }
    }
}