using System;
using System.Collections.Generic;
using System.Text;
using System.Data.SqlClient;
using Tanshu.Accounts.Contracts;
using Tanshu.Data.DAO;
using Tanshu.Accounts.DAOFactory;

namespace Tanshu.Accounts.SqlDAO
{
    public class InventoryDAO : BaseDAO, IInventoryDAO
    {
        public InventoryDAO(IConnectionDAO connection)
            : base(connection)
        { }

        public bool Insert(InventoryBO inventory)
        {
            using (SqlCommand cmd = new SqlCommand(@"
SET @InventoryID = NEWID();                
INSERT INTO Inventory (InventoryID, VoucherID, ProductID, ComplexProductID, Quantity, Rate, Tax, Discount, IsRateFinal) VALUES (@InventoryID, @VoucherID, @ProductID, @ComplexProductID, @Quantity, @Rate, @Tax, @Discount, @IsRateFinal);
SELECT @timestamp = timestamp, @Amount = Amount FROM Inventory WHERE InventoryID = @InventoryID;
"))
            {
                cmd.Parameters.Add("@InventoryID", System.Data.SqlDbType.UniqueIdentifier);
                cmd.Parameters["@InventoryID"].Direction = System.Data.ParameterDirection.Output;
                cmd.Parameters.AddWithValue("@VoucherID", inventory.VoucherID);
                cmd.Parameters.AddWithValue("@ProductID", inventory.ProductID);
                if (inventory.ComplexProductID.HasValue)
                    cmd.Parameters.AddWithValue("@ComplexProductID", inventory.ComplexProductID);
                else
                    cmd.Parameters.AddWithValue("@ComplexProductID", DBNull.Value);
                cmd.Parameters.AddWithValue("@Quantity", inventory.Quantity);
                cmd.Parameters.AddWithValue("@Rate", inventory.Rate);
                cmd.Parameters.AddWithValue("@Tax", inventory.Tax);
                cmd.Parameters.AddWithValue("@Discount", inventory.Discount);
                cmd.Parameters.Add("@Amount", System.Data.SqlDbType.Decimal);
                cmd.Parameters["@Amount"].Direction = System.Data.ParameterDirection.Output;
                cmd.Parameters.AddWithValue("@IsRateFinal", inventory.IsRateFinal);
                cmd.Parameters.Add("@timestamp", System.Data.SqlDbType.Timestamp);
                cmd.Parameters["@timestamp"].Direction = System.Data.ParameterDirection.Output;
                connection.ExecuteNonQuery(cmd);
                inventory.InventoryID = (Guid)cmd.Parameters["@InventoryID"].Value;
                inventory.timestamp = (byte[])cmd.Parameters["@timestamp"].Value;
                return true;
            }
        }
        public bool Update(InventoryBO inventory)
        {
            using (SqlCommand cmd = new SqlCommand(@"
UPDATE Inventory SET VoucherID = @VoucherID, ProductID = @ProductID, ComplexProductID = @ComplexProductID, Quantity = @Quantity, Rate = @Rate, Tax = @Tax, Discount = @Discount, IsRateFinal = @IsRateFinal WHERE InventoryID = @InventoryID;
SELECT @timestamp = timestamp, @Amount = Amount FROM Inventory WHERE InventoryID = @InventoryID;"))
            {
                cmd.Parameters.AddWithValue("@InventoryID", inventory.InventoryID);
                cmd.Parameters.AddWithValue("@VoucherID", inventory.VoucherID);
                cmd.Parameters.AddWithValue("@ProductID", inventory.ProductID);
                if (inventory.ComplexProductID.HasValue)
                    cmd.Parameters.AddWithValue("@ComplexProductID", inventory.ComplexProductID);
                else
                    cmd.Parameters.AddWithValue("@ComplexProductID", DBNull.Value);
                cmd.Parameters.AddWithValue("@Quantity", inventory.Quantity);
                cmd.Parameters.AddWithValue("@Rate", inventory.Rate);
                cmd.Parameters.AddWithValue("@Tax", inventory.Tax);
                cmd.Parameters.AddWithValue("@Discount", inventory.Discount);
                cmd.Parameters.Add("@Amount", System.Data.SqlDbType.Decimal);
                cmd.Parameters["@Amount"].Direction = System.Data.ParameterDirection.Output;
                cmd.Parameters.AddWithValue("@IsRateFinal", inventory.IsRateFinal);
                cmd.Parameters.Add("@timestamp", System.Data.SqlDbType.Timestamp);
                cmd.Parameters["@timestamp"].Direction = System.Data.ParameterDirection.Output;
                connection.ExecuteNonQuery(cmd);
                inventory.timestamp = (byte[])cmd.Parameters["@timestamp"].Value;
                return true;
            }
        }
        public bool Delete(Guid voucherID)
        {
            using (SqlCommand cmd = new SqlCommand("DELETE from Inventory where VoucherID = @VoucherID"))
            {
                cmd.Parameters.AddWithValue("@VoucherID", voucherID);
                connection.ExecuteNonQuery(cmd);
                return true;
            }
        }
        public bool Delete(Guid voucherID, Guid productID)
        {
            using (SqlCommand cmd = new SqlCommand("DELETE from Inventory where VoucherID = @VoucherID and ProductID = @ProductID"))
            {
                cmd.Parameters.AddWithValue("@VoucherID", voucherID);
                cmd.Parameters.AddWithValue("@InventoryID", productID);
                connection.ExecuteNonQuery(cmd);
                return true;
            }
        }

        public List<InventoryDisplayBO> GetInventories(Guid voucherID)
        {
            SqlCommand cmd = new SqlCommand("SELECT p.Name + ' (' + p.Units +')' AS ProductName, i.* FROM Inventory i INNER JOIN Products p ON i.ProductID = p.ProductID WHERE VoucherID = @VoucherID ORDER BY timestamp");
            cmd.Parameters.AddWithValue("@VoucherID", voucherID);
            return BusinessObjectDAO<InventoryDisplayBO>.GetBusinessObjects(connection.ExecuteReader(cmd));
        }
    }
}