using System;
using Sog;
using ProtoCSStruct;
using MySql.Data.MySqlClient;

namespace Mail
{
    public class MysqlMailDBOperator : MailDBOperator
    {
        private MySqlDB m_mySqlDb;


        public MysqlMailDBOperator(string db, string ip, string user, string password)
        {
            m_mySqlDb = new MySqlDB(db, ip, user, password);
        }

        //销毁的时候置空
        public override void Dispose()
        {
            m_mySqlDb.Dispose();
            m_mySqlDb = null;
        }

        public override void KeepAlive()
        {
            string strSql = "select * from tbmail_1 where uid=0";

            MySqlDataReader reader = m_mySqlDb.ExecReader(strSql);
            if (reader == null)
            {
                TraceLog.Trace("MysqlMailDBOperator.KeepAlive no record , return reader is null");
                return;
            }

            //记住一定要Close
            reader.Close();

            TraceLog.Trace("MysqlMailDBOperator.KeepAlive exec at {0}", DateTime.Now);
        }

        /// <summary>
        /// 返回0 成功
        /// 1 表示空，没记录
        /// -1 表示失败
        /// </summary>
        /// <param name="uid"></param>
        /// <param name="blob"></param>
        /// <returns></returns>
        public override int QueryMail(long uid, ref DBMailBlob blob)
        {
            string tableName = MailServerUtils.GetMailTableName(uid);

            TraceLog.Trace("MysqlMailDBOperator.QueryMail uid {0} to table {1}", uid, tableName);

            string strSql = string.Format("select data from {0} where uid={1}", tableName, uid);

            MySqlDataReader reader = m_mySqlDb.ExecReader(strSql);
            if (reader == null)
            {
                TraceLog.Trace("MysqlMailDBOperator.QueryMail no record in table {0}, return reader is null!", tableName);
                return -1;
            }

            //没有记录是正常的
            if (reader.HasRows == false)
            {
                TraceLog.Trace("MysqlMailDBOperator.QueryMail no record in table {0}", tableName);
                //记住一定要Close
                reader.Close();

                return 1;
            }

            try
            {
                reader.Read();

                int dataIndex = reader.GetOrdinal("data");
                byte[] buffer = new byte[500 * 1024];
                long dataLength = reader.GetBytes(dataIndex, 0, buffer, 0, buffer.Length);
                byte[] dataByte = new byte[dataLength];
                Buffer.BlockCopy(buffer, 0, dataByte, 0, (int)dataLength);
                dataByte = UnzipData(dataByte);
                StructMessageParseUtils.ParseFrom(ref blob, dataByte);
                TraceLog.Trace("MysqlMailDBOperator.QueryMail query success uid {0} ", uid);

                return 0;
            }
            catch (Exception ex)
            {
                TraceLog.Exception(ex);
            }
            finally
            {
                reader.Close();
            }

            return -1;
        }

        public override bool InsertMail(long uid, ref DBMailBlob blob)
        {
            string tableName = MailServerUtils.GetMailTableName(uid);

            TraceLog.Trace("MysqlMailDBOperator.InsertMail uid {0} to table {1}", uid, tableName);

            string strSql = string.Format("insert into {0} (uid,data) values({1},?data)"
                , tableName, uid);


            byte[] dataByte = StructMessageParseUtils.ToByteArray(ref blob);
            dataByte = ZipData(dataByte);
            MySqlParameter p_data = new MySqlParameter("?data", MySqlDbType.MediumBlob) { Value = dataByte };

            TraceLog.Trace("MysqlMailDBOperator.InsertMail exec sql: {0}", strSql);

            MySqlDataReader reader = m_mySqlDb.ExecReader(strSql, p_data);
            if (reader == null)
            {
                TraceLog.Error("MysqlMailDBOperator.InsertMail failed, return reader is null!");
                return false;
            }

            reader.Close();

            TraceLog.Trace("MysqlMailDBOperator.InsertMail uid {0} to table success,data list count={1}", uid,blob.MailList.Count);

            return true;
        }

        public override bool UpdateMail(long uid, ref DBMailBlob blob)
        {
            string tableName = MailServerUtils.GetMailTableName(uid);

            TraceLog.Trace("MysqlMailDBOperator.UpdateMail uid {0} to table {1}", uid, tableName);

            string strSql = string.Format("update {0} set data=?data where uid={1}", tableName, uid);


            byte[] dataByte = StructMessageParseUtils.ToByteArray(ref blob);
            dataByte = ZipData(dataByte);
            MySqlParameter p_data = new MySqlParameter("?data", MySqlDbType.MediumBlob) { Value = dataByte };

            TraceLog.Trace("MysqlMailDBOperator.UpdateMail exec sql: {0}", strSql);

            MySqlDataReader reader = m_mySqlDb.ExecReader(strSql, p_data);
            if (reader == null)
            {
                TraceLog.Error("MysqlMailDBOperator.UpdateMail failed, return reader is null!");
                return false;
            }

            reader.Close();

            TraceLog.Trace("MysqlMailDBOperator.UpdateMail uid {0} to table success,data count={1}", uid,blob.MailList.Count);

            return true;
        }

    }
}