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 WaiterDAO : BaseDAO, IWaiterDAO
    {
        public WaiterDAO(IConnectionDAO connection)

            : base(connection)
        { }
        public bool Insert(WaiterBO waiter)
        {
            using (SqlCommand cmd = new SqlCommand(@"
SELECT @WaiterID = NEWID(), @Code = ISNULL(MAX(Code), 0) + 1 FROM Waiters;
INSERT INTO Waiters (WaiterID, Code, Name) VALUES (@WaiterID, @Code, @Name);
SELECT @timestamp = timestamp FROM Waiters WHERE WaiterID = @WaiterID;
"))
            {
                cmd.Parameters.Add("@WaiterID", System.Data.SqlDbType.UniqueIdentifier);
                cmd.Parameters["@WaiterID"].Direction = System.Data.ParameterDirection.Output;
                cmd.Parameters.Add("@Code", System.Data.SqlDbType.Int);
                cmd.Parameters["@Code"].Direction = System.Data.ParameterDirection.Output;
                cmd.Parameters.AddWithValue("@Name", waiter.Name);
                cmd.Parameters.Add("@timestamp", System.Data.SqlDbType.Timestamp);
                cmd.Parameters["@timestamp"].Direction = System.Data.ParameterDirection.Output;
                connection.ExecuteNonQuery(cmd);
                waiter.WaiterID = (Guid)cmd.Parameters["@WaiterID"].Value;
                waiter.Code = (int)cmd.Parameters["@Code"].Value;
                waiter.timestamp = (byte[])cmd.Parameters["@timestamp"].Value;
                return true;
            }
        }
        public bool Update(WaiterBO waiter)
        {
            using (SqlCommand cmd = new SqlCommand(@"
UPDATE Waiters SET Name = @Name, Code = @Code WHERE WaiterID = @WaiterID;
SELECT @timestamp = timestamp FROM Waiters WHERE WaiterID = @WaiterID;
"))
            {
                cmd.Parameters.AddWithValue("@WaiterID", waiter.WaiterID);
                cmd.Parameters.AddWithValue("@Code", waiter.Code);
                cmd.Parameters.AddWithValue("@Name", waiter.Name);
                cmd.Parameters.Add("@timestamp", System.Data.SqlDbType.Timestamp);
                cmd.Parameters["@timestamp"].Direction = System.Data.ParameterDirection.Output;
                connection.ExecuteNonQuery(cmd);
                waiter.timestamp = (byte[])cmd.Parameters["@timestamp"].Value;
                return true;
            }
        }
        public bool Delete(Guid waiterID)
        {
            bool result;
            using (SqlCommand cmd = new SqlCommand("SELECT Count(*) FROM SaleVoucher WHERE WaiterID = @WaiterID"))
            {
                cmd.Parameters.AddWithValue("@WaiterID", waiterID);
                result = 0 == (int)connection.ExecuteScalar(cmd);
            }
            if (result == false)
                return false;
            using (SqlCommand cmd = new SqlCommand("DELETE FROM Waiters WHERE WaiterID = @WaiterID"))
            {
                cmd.Parameters.AddWithValue("@WaiterID", waiterID);
                connection.ExecuteNonQuery(cmd);
                return true;
            }
        }

        public WaiterBO GetWaiter(Guid waiterID)
        {
            SqlCommand cmd = new SqlCommand("SELECT * FROM Waiters WHERE WaiterID = @WaiterID");
            cmd.Parameters.AddWithValue("@WaiterID", waiterID);
            return BusinessObjectDAO<WaiterBO>.GetBusinessObject(connection.ExecuteReader(cmd));
        }
        public WaiterBO GetWaiter(int code)
        {
            SqlCommand cmd = new SqlCommand("SELECT * FROM Waiters WHERE Code = @Code");
            cmd.Parameters.AddWithValue("@Code", code);
            return BusinessObjectDAO<WaiterBO>.GetBusinessObject(connection.ExecuteReader(cmd));
        }

        public List<WaiterBO> GetWaiters()
        {
            return BusinessObjectDAO<WaiterBO>.GetBusinessObjects(connection.ExecuteReader("SELECT * FROM Waiters ORDER BY Name"));
        }
        public List<WaiterBO> GetFilteredWaiters(Dictionary<string, string> filter)
        {
            string name = string.Format("%{0}%", filter["Name"].Trim());
            using (SqlCommand cmd = new SqlCommand("SELECT * FROM Waiters WHERE Name LIKE @Name ORDER BY Name"))
            {
                cmd.Parameters.AddWithValue("@Name", name);
                return BusinessObjectDAO<WaiterBO>.GetBusinessObjects(connection.ExecuteReader(cmd));
            }
        }
    }
}