using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Common;
using System.Data.SQLite;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace MyJobSearch.Common
{
    /// <summary>
    /// 本類為SQLite資料庫幫助靜態類,使用時只需直接呼叫即可,無需例項化
    /// </summary>
    public static class SQLiteHelper
    {
        /// <summary>
        /// 資料庫連線字串
        /// </summary>
        public static string connectionString = "Data Source=" + Application.StartupPath + "\\" + System.Configuration.ConfigurationSettings.AppSettings["Contr"];


        #region 執行資料庫操作(新增、更新或刪除)，返回影響行數
        /// <summary>
        /// 執行資料庫操作(新增、更新或刪除)
        /// </summary>
        /// <param name="cmd">SqlCommand物件</param>
        /// <returns>所受影響的行數</returns>
        public static int ExecuteNonQuery(SQLiteCommand cmd)
        {
            int result = 0;
            if (connectionString == null || connectionString.Length == 0)
                throw new ArgumentNullException("connectionString");
            using (SQLiteConnection con = new SQLiteConnection(connectionString))
            {
                SQLiteTransaction trans = null;
                PrepareCommand(cmd, con, ref trans, true, cmd.CommandType, cmd.CommandText);
                try
                {
                    result = cmd.ExecuteNonQuery();
                    trans.Commit();
                }
                catch (Exception ex)
                {
                    trans.Rollback();
                    throw ex;
                }
            }
            return result;
        }

        /// <summary>
        /// 執行資料庫操作(新增、更新或刪除)
        /// </summary>
        /// <param name="commandText">執行語句或儲存過程名</param>
        /// <param name="commandType">執行型別(預設語句)</param>
        /// <returns>所受影響的行數</returns>
        public static int ExecuteNonQuery(string commandText, CommandType commandType = CommandType.Text)
        {
            int result = 0;
            if (connectionString == null || connectionString.Length == 0)
                throw new ArgumentNullException("connectionString");
            if (commandText == null || commandText.Length == 0)
                throw new ArgumentNullException("commandText");
            SQLiteCommand cmd = new SQLiteCommand();
            using (SQLiteConnection con = new SQLiteConnection(connectionString))
            {
                SQLiteTransaction trans = null;
                PrepareCommand(cmd, con, ref trans, true, commandType, commandText);
                try
                {
                    result = cmd.ExecuteNonQuery();
                    trans.Commit();
                }
                catch (Exception ex)
                {
                    trans.Rollback();
                    throw ex;
                }
            }
            return result;
        }

        /// <summary>
        /// 執行資料庫操作(新增、更新或刪除)
        /// </summary>
        /// <param name="commandText">執行語句或儲存過程名</param>
        /// <param name="commandType">執行型別(預設語句)</param>
        /// <param name="cmdParms">SQL引數物件</param>
        /// <returns>所受影響的行數</returns>
        public static int ExecuteNonQuery(string commandText, CommandType commandType = CommandType.Text, params SQLiteParameter[] cmdParms)
        {
            int result = 0;
            if (connectionString == null || connectionString.Length == 0)
                throw new ArgumentNullException("connectionString");
            if (commandText == null || commandText.Length == 0)
                throw new ArgumentNullException("commandText");

            SQLiteCommand cmd = new SQLiteCommand();
            using (SQLiteConnection con = new SQLiteConnection(connectionString))
            {
                SQLiteTransaction trans = null;
                PrepareCommand(cmd, con, ref trans, true, commandType, commandText,cmdParms);
                try
                {
                    result = cmd.ExecuteNonQuery();
                    trans.Commit();
                }
                catch (Exception ex)
                {
                    trans.Rollback();
                    throw ex;
                }
            }
            return result;
        }
        #endregion

        #region 執行資料庫操作(新增、更新或刪除)同時返回執行後查詢所得的第1行第1列資料
        /// <summary>
        /// 執行資料庫操作(新增、更新或刪除)同時返回執行後查詢所得的第1行第1列資料
        /// </summary>
        /// <param name="cmd">SqlCommand物件</param>
        /// <returns>查詢所得的第1行第1列資料</returns>
        public static object ExecuteScalar(SQLiteCommand cmd)
        {
            object result = 0;
            if (connectionString == null || connectionString.Length == 0)
                throw new ArgumentNullException("connectionString");
            using (SQLiteConnection con = new SQLiteConnection(connectionString))
            {
                SQLiteTransaction trans = null;
                PrepareCommand(cmd, con, ref trans, true, cmd.CommandType, cmd.CommandText);
                try
                {
                    result = cmd.ExecuteScalar();
                    trans.Commit();
                }
                catch (Exception ex)
                {
                    trans.Rollback();
                    throw ex;
                }
            }
            return result;
        }

        /// <summary>
        /// 執行資料庫操作(新增、更新或刪除)同時返回執行後查詢所得的第1行第1列資料
        /// </summary>
        /// <param name="commandText">執行語句或儲存過程名</param>
        /// <param name="commandType">執行型別（預設語句）</param>
        /// <returns>查詢所得的第1行第1列資料</returns>
        public static object ExecuteScalar(string commandText, CommandType commandType = CommandType.Text)
        {
            object result = 0;
            if (connectionString == null || connectionString.Length == 0)
                throw new ArgumentNullException("connectionString");
            if (commandText == null || commandText.Length == 0)
                throw new ArgumentNullException("commandText");
            SQLiteCommand cmd = new SQLiteCommand();
            using (SQLiteConnection con = new SQLiteConnection(connectionString))
            {
                SQLiteTransaction trans = null;
                PrepareCommand(cmd, con, ref trans, true, commandType, commandText);
                try
                {
                    result = cmd.ExecuteScalar();
                    trans.Commit();
                }
                catch (Exception ex)
                {
                    trans.Rollback();
                    throw ex;
                }
            }
            return result;
        }

        /// <summary>
        /// 執行資料庫操作(新增、更新或刪除)同時返回執行後查詢所得的第1行第1列資料
        /// </summary>
        /// <param name="commandText">執行語句或儲存過程名</param>
        /// <param name="commandType">執行型別(預設語句)</param>
        /// <param name="cmdParms">SQL引數物件</param>
        /// <returns>查詢所得的第1行第1列資料</returns>
        public static object ExecuteScalar(string commandText, CommandType commandType = CommandType.Text, params SQLiteParameter[] cmdParms)
        {
            object result = 0;
            if (connectionString == null || connectionString.Length == 0)
                throw new ArgumentNullException("connectionString");
            if (commandText == null || commandText.Length == 0)
                throw new ArgumentNullException("commandText");

            SQLiteCommand cmd = new SQLiteCommand();
            using (SQLiteConnection con = new SQLiteConnection(connectionString))
            {
                SQLiteTransaction trans = null;
                PrepareCommand(cmd, con, ref trans, true, commandType, commandText, cmdParms);
                try
                {
                    result = cmd.ExecuteScalar();
                    trans.Commit();
                }
                catch (Exception ex)
                {
                    trans.Rollback();
                    throw ex;
                }
            }
            return result;
        }
        #endregion

        #region 執行資料庫查詢，返回SqlDataReader物件
        /// <summary>
        /// 執行資料庫查詢，返回SqlDataReader物件
        /// </summary>
        /// <param name="cmd">SqlCommand物件</param>
        /// <returns>SqlDataReader物件</returns>
        public static DbDataReader ExecuteReader(SQLiteCommand cmd)
        {
            DbDataReader reader = null;
            if (connectionString == null || connectionString.Length == 0)
                throw new ArgumentNullException("connectionString");

            SQLiteConnection con = new SQLiteConnection(connectionString);
            SQLiteTransaction trans = null;
            PrepareCommand(cmd, con, ref trans, false, cmd.CommandType, cmd.CommandText);
            try
            {
                reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
            }
            catch (Exception ex)
            {
                throw ex;
            }
            return reader;
        }

        /// <summary>
        /// 執行資料庫查詢，返回SqlDataReader物件
        /// </summary>
        /// <param name="commandText">執行語句或儲存過程名</param>
        /// <param name="commandType">執行型別(預設語句)</param>
        /// <returns>SqlDataReader物件</returns>
        public static DbDataReader ExecuteReader(string commandText, CommandType commandType = CommandType.Text)
        {
            DbDataReader reader = null;
            if (connectionString == null || connectionString.Length == 0)
                throw new ArgumentNullException("connectionString");
            if (commandText == null || commandText.Length == 0)
                throw new ArgumentNullException("commandText");

            SQLiteConnection con = new SQLiteConnection(connectionString);
            SQLiteCommand cmd = new SQLiteCommand();
            SQLiteTransaction trans = null;
            PrepareCommand(cmd, con, ref trans, false, commandType, commandText);
            try
            {
                reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
            }
            catch (Exception ex)
            {
                throw ex;
            }
            return reader;
        }

        /// <summary>
        /// 執行資料庫查詢，返回SqlDataReader物件
        /// </summary>
        /// <param name="commandText">執行語句或儲存過程名</param>
        /// <param name="commandType">執行型別（預設語句）</param>
        /// <param name="cmdParms">SQL引數物件</param>
        /// <returns>SqlDataReader物件</returns>
        public static DbDataReader ExecuteReader(string commandText, CommandType commandType = CommandType.Text, params SQLiteParameter[] cmdParms)
        {
            DbDataReader reader = null;
            if (connectionString == null || connectionString.Length == 0)
                throw new ArgumentNullException("connectionString");
            if (commandText == null || commandText.Length == 0)
                throw new ArgumentNullException("commandText");

            SQLiteConnection con = new SQLiteConnection(connectionString);
            SQLiteCommand cmd = new SQLiteCommand();
            SQLiteTransaction trans = null;
            PrepareCommand(cmd, con, ref trans, false, commandType, commandText, cmdParms);
            try
            {
                reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
            }
            catch (Exception ex)
            {
                throw ex;
            }
            return reader;
        }
        #endregion

        #region 執行資料庫查詢，返回DataSet物件
        /// <summary>
        /// 執行資料庫查詢，返回DataSet物件
        /// </summary>
        /// <param name="cmd">SqlCommand物件</param>
        /// <returns>DataSet物件</returns>
        public static DataSet ExecuteDataSet(SQLiteCommand cmd)
        {
            DataSet ds = new DataSet();
            SQLiteConnection con = new SQLiteConnection(connectionString);
            SQLiteTransaction trans = null;
            PrepareCommand(cmd, con, ref trans, false, cmd.CommandType, cmd.CommandText);
            try
            {
                SQLiteDataAdapter sda = new SQLiteDataAdapter(cmd);
                sda.Fill(ds);
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (cmd.Connection != null)
                {
                    if (cmd.Connection.State == ConnectionState.Open)
                    {
                        cmd.Connection.Close();
                    }
                }
            }
            return ds;
        }

        /// <summary>
        /// 執行資料庫查詢，返回DataSet物件
        /// </summary>
        /// <param name="commandText">執行語句或儲存過程名</param>
        /// <param name="commandType">執行型別(預設語句)</param>
        /// <returns>DataSet物件</returns>
        public static DataSet ExecuteDataSet(string commandText, CommandType commandType = CommandType.Text)
        {
            if (connectionString == null || connectionString.Length == 0)
                throw new ArgumentNullException("connectionString");
            if (commandText == null || commandText.Length == 0)
                throw new ArgumentNullException("commandText");
            DataSet ds = new DataSet();
            SQLiteConnection con = new SQLiteConnection(connectionString);
            SQLiteCommand cmd = new SQLiteCommand();
            SQLiteTransaction trans = null;
            PrepareCommand(cmd, con, ref trans, false, commandType, commandText);
            try
            {
                SQLiteDataAdapter sda = new SQLiteDataAdapter(cmd);
                sda.Fill(ds);
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (con != null)
                {
                    if (con.State == ConnectionState.Open)
                    {
                        con.Close();
                    }
                }
            }
            return ds;
        }

        /// <summary>
        /// 執行資料庫查詢，返回DataSet物件
        /// </summary>
        /// <param name="commandText">執行語句或儲存過程名</param>
        /// <param name="commandType">執行型別(預設語句)</param>
        /// <param name="cmdParms">SQL引數物件</param>
        /// <returns>DataSet物件</returns>
        public static DataSet ExecuteDataSet(string commandText, CommandType commandType = CommandType.Text, params SQLiteParameter[] cmdParms)
        {
            if (connectionString == null || connectionString.Length == 0)
                throw new ArgumentNullException("connectionString");
            if (commandText == null || commandText.Length == 0)
                throw new ArgumentNullException("commandText");
            DataSet ds = new DataSet();
            SQLiteConnection con = new SQLiteConnection(connectionString);
            SQLiteCommand cmd = new SQLiteCommand();
            SQLiteTransaction trans = null;
            PrepareCommand(cmd, con, ref trans, false, commandType, commandText, cmdParms);
            try
            {
                SQLiteDataAdapter sda = new SQLiteDataAdapter(cmd);
                sda.Fill(ds);
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (con != null)
                {
                    if (con.State == ConnectionState.Open)
                    {
                        con.Close();
                    }
                }
            }
            return ds;
        }
        #endregion

        #region 執行資料庫查詢，返回DataTable物件
        /// <summary>
        /// 執行資料庫查詢，返回DataTable物件
        /// </summary>
        /// <param name="commandText">執行語句或儲存過程名</param>
        /// <param name="commandType">執行型別(預設語句)</param>
        /// <returns>DataTable物件</returns>
        public static DataTable ExecuteDataTable(string commandText, CommandType commandType = CommandType.Text)
        {
            if (connectionString == null || connectionString.Length == 0)
                throw new ArgumentNullException("connectionString");
            if (commandText == null || commandText.Length == 0)
                throw new ArgumentNullException("commandText");
            DataTable dt = new DataTable();
            SQLiteConnection con = new SQLiteConnection(connectionString);
            SQLiteCommand cmd = new SQLiteCommand();
            SQLiteTransaction trans = null;
            PrepareCommand(cmd, con, ref trans, false, commandType, commandText);
            try
            {
                SQLiteDataAdapter sda = new SQLiteDataAdapter(cmd);
                sda.Fill(dt);
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (con != null)
                {
                    if (con.State == ConnectionState.Open)
                    {
                        con.Close();
                    }
                }
            }
            return dt;
        }

        #endregion

        #region 通用分頁查詢方法
        /// <summary>
        /// 通用分頁查詢方法
        /// </summary>
        /// <param name="tableName">表名</param>
        /// <param name="strColumns">查詢欄位名</param>
        /// <param name="strWhere">where條件</param>
        /// <param name="strOrder">排序條件</param>
        /// <param name="pageSize">每頁資料數量</param>
        /// <param name="currentIndex">當前頁數</param>
        /// <param name="recordOut">資料總量</param>
        /// <returns>DataTable資料表</returns>
        public static DataTable SelectPaging(string tableName, string strColumns, string strWhere, string strOrder, int pageSize, int currentIndex, out int recordOut)
        {
            DataTable dt = new DataTable();
            recordOut = Convert.ToInt32(ExecuteScalar("select count(*) from " + tableName, CommandType.Text));
            string pagingTemplate = "select {0} from {1} where {2} order by {3} limit {4} offset {5} ";
            int offsetCount = (currentIndex - 1) * pageSize;
            string commandText = String.Format(pagingTemplate, strColumns, tableName, strWhere, strOrder, pageSize.ToString(), offsetCount.ToString());
            using (DbDataReader reader = ExecuteReader(commandText, CommandType.Text))
            {
                if (reader != null)
                {
                    dt.Load(reader);
                }
            }
            return dt;
        }

        #endregion

        #region 預處理Command物件,資料庫連結,事務,需要執行的物件,引數等的初始化
        /// <summary>
        /// 預處理Command物件,資料庫連結,事務,需要執行的物件,引數等的初始化
        /// </summary>
        /// <param name="cmd">Command物件</param>
        /// <param name="conn">Connection物件</param>
        /// <param name="trans">Transcation物件</param>
        /// <param name="useTrans">是否使用事務</param>
        /// <param name="cmdType">SQL字串執行型別</param>
        /// <param name="cmdText">SQL Text</param>
        /// <param name="cmdParms">SQLiteParameters to use in the command</param>
        private static void PrepareCommand(SQLiteCommand cmd, SQLiteConnection conn, ref SQLiteTransaction trans, bool useTrans, CommandType cmdType, string cmdText, params SQLiteParameter[] cmdParms)
        {

            if (conn.State != ConnectionState.Open)
                conn.Open();

            cmd.Connection = conn;
            cmd.CommandText = cmdText;

            if (useTrans)
            {
                trans = conn.BeginTransaction(IsolationLevel.ReadCommitted);
                cmd.Transaction = trans;
            }


            cmd.CommandType = cmdType;

            if (cmdParms != null)
            {
                foreach (SQLiteParameter parm in cmdParms)
                    cmd.Parameters.Add(parm);
            }
        }
    
        #endregion

    }
}