using System;
using System.Data.Common;
using System.Transactions;
using WebLib;

namespace 報到系統
{
    /// <summary>
    /// MMSPlatform 資料存取類別
    /// </summary>
    public class DAC_MMSPlatform : DAC
    {
        private const string _tableName = "[MMSPlatform]";
        private const string _allFields = "[ID], [PlatformCode], [PlatformName], [Account], [Password], [Remark], [DB_APPNO], [DB_CRDAT], [DB_CRUSR], [DB_TRDAT], [DB_TRUSR]";

        public DAC_MMSPlatform() : base() { }

        public DAC_MMSPlatform(DbConnection conn) : base(conn) { }

        /// <summary>查詢所有平台</summary>
        public MMSPlatformList SelectAll()
        {
            MMSPlatformList result = new MMSPlatformList();
            IDataList list = result as IDataList;
            DbCommand cmd = NewCommand();
            cmd.CommandText = "select " + _allFields + " from " + _tableName + " order by [ID]";
            Select(cmd, ref list);
            return result;
        }

        /// <summary>依平台代碼查一筆</summary>
        public MMSPlatformItem SelectByCode(string platformCode)
        {
            MMSPlatformList result = new MMSPlatformList();
            IDataList list = result as IDataList;
            DbCommand cmd = NewCommand();
            cmd.CommandText = "select " + _allFields + " from " + _tableName + " where [PlatformCode] = @PlatformCode";
            AddParam(cmd, "PlatformCode", platformCode);
            Select(cmd, ref list);
            return result.Count > 0 ? result[0] : null;
        }

        /// <summary>新增一筆平台設定</summary>
        public MMSPlatformItem InsertOne(MMSPlatformItem item)
        {
            using (TransactionScope ts = DAC.NewTransactionScope())
            {
                DbCommand cmd = NewCommand();
                cmd.CommandText =
                    "insert into " + _tableName + " ([PlatformCode],[PlatformName],[Account],[Password],[Remark],[DB_APPNO],[DB_CRDAT],[DB_CRUSR],[DB_TRDAT],[DB_TRUSR]) " +
                    "values (@PlatformCode,@PlatformName,@Account,@Password,@Remark,1,@DB_CRDAT,@DB_CRUSR,@DB_TRDAT,@DB_TRUSR); select @@identity";
                AddParam(cmd, "PlatformCode", item.PlatformCode);
                AddParam(cmd, "PlatformName", item.PlatformName);
                AddParam(cmd, "Account",      (object)item.Account   ?? DBNull.Value);
                AddParam(cmd, "Password",     (object)item.Password  ?? DBNull.Value);
                AddParam(cmd, "Remark",       (object)item.Remark    ?? DBNull.Value);
                AddParam(cmd, "DB_CRDAT",     DateTime.Now);
                AddParam(cmd, "DB_CRUSR",     CurrentUserId);
                AddParam(cmd, "DB_TRDAT",     DateTime.Now);
                AddParam(cmd, "DB_TRUSR",     CurrentUserId);
                int newId;
                ExecuteScalar(cmd, out newId);
                item.ID = newId;
                ts.Complete();
                return item;
            }
        }

        /// <summary>修改一筆平台設定（含 DB_APPNO 樂觀鎖定）</summary>
        public MMSPlatformItem UpdateOne(MMSPlatformItem item)
        {
            using (TransactionScope ts = DAC.NewTransactionScope())
            {
                // 備份舊值
                MMSPlatformItem old = SelectByCode(item.PlatformCode);
                if (old == null || old.DB_APPNO != item.DB_APPNO)
                    throw new System.Data.DBConcurrencyException("在更新 \"MMSPlatform\" 資料表時發生並行例外：找不到要更新的資料列");

                DoBackup(old, "UPDATE");

                DbCommand cmd = NewCommand();
                cmd.CommandText =
                    "update " + _tableName + " set " +
                    "  [PlatformName]=@PlatformName, [Account]=@Account, [Password]=@Password, [Remark]=@Remark, " +
                    "  [DB_APPNO]=DB_APPNO+1, [DB_TRDAT]=@DB_TRDAT, [DB_TRUSR]=@DB_TRUSR " +
                    "where [ID]=@ID and [DB_APPNO]=@original_DB_APPNO";
                AddParam(cmd, "PlatformName",      item.PlatformName);
                AddParam(cmd, "Account",           (object)item.Account  ?? DBNull.Value);
                AddParam(cmd, "Password",          (object)item.Password ?? DBNull.Value);
                AddParam(cmd, "Remark",            (object)item.Remark   ?? DBNull.Value);
                AddParam(cmd, "DB_TRDAT",          DateTime.Now);
                AddParam(cmd, "DB_TRUSR",          CurrentUserId);
                AddParam(cmd, "ID",                item.ID);
                AddParam(cmd, "original_DB_APPNO", item.DB_APPNO);
                ExecuteNonQuery(cmd);
                ts.Complete();
                return item;
            }
        }

        private void DoBackup(MMSPlatformItem item, string updateMode)
        {
            DbCommand cmd = NewCommand();
            cmd.CommandText =
                "insert into [MMSPlatform_BAK] ([ID],[PlatformCode],[PlatformName],[Account],[Password],[Remark],[DB_APPNO],[DB_CRDAT],[DB_CRUSR],[DB_TRDAT],[DB_TRUSR],[DB_TRMOD]) " +
                "values (@ID,@PlatformCode,@PlatformName,@Account,@Password,@Remark,@DB_APPNO,@DB_CRDAT,@DB_CRUSR,@DB_TRDAT,@DB_TRUSR,@DB_TRMOD)";
            AddParam(cmd, "ID",           item.ID);
            AddParam(cmd, "PlatformCode", item.PlatformCode);
            AddParam(cmd, "PlatformName", item.PlatformName);
            AddParam(cmd, "Account",      (object)item.Account  ?? DBNull.Value);
            AddParam(cmd, "Password",     (object)item.Password ?? DBNull.Value);
            AddParam(cmd, "Remark",       (object)item.Remark   ?? DBNull.Value);
            AddParam(cmd, "DB_APPNO",     item.DB_APPNO);
            AddParam(cmd, "DB_CRDAT",     item.DB_CRDAT);
            AddParam(cmd, "DB_CRUSR",     item.DB_CRUSR);
            AddParam(cmd, "DB_TRDAT",     DateTime.Now);
            AddParam(cmd, "DB_TRUSR",     CurrentUserId);
            AddParam(cmd, "DB_TRMOD",     updateMode);
            ExecuteNonQuery(cmd);
        }
    }
}