using System.Data;
using System.IO;
using System.Windows.Forms;
using System.Drawing;
using System.Data.SqlClient;
using System;
using System.Text;
using System.Data.OleDb;

namespace FlyDockTool
{
    public class accessOptions
    {
        public OleDbConnection SqlConn = null;
        /// <summary>
        /// 让此类创建一个单例类
        /// </summary>
        public static accessOptions Instance = null;//申明一个EcgDrawing对象，复制Null
        private static readonly object LockHelper = new object();

        public static accessOptions CreateInstance(string accessDbPath)
        {
            if (Instance == null)
            {
                lock (LockHelper)
                {
                    if (Instance == null)
                        Instance = new accessOptions(accessDbPath);
                }
            }
            return Instance;
        }

        public accessOptions(string accessDbPath)
        {
            GetSqlConnection(accessDbPath);
        }

        /// <summary>
        /// 获得sqlite数据库连接
        /// </summary>
        /// <returns></returns>
        public bool GetSqlConnection(string accessDbPath)
        {
            try
            {
                string ConnectionStr = "Provider=Microsoft.Jet.OleDb.4.0;";
                ConnectionStr += @"Data Source="+ accessDbPath + "";
                OleDbConnection conn = new OleDbConnection(ConnectionStr);
                SqlConn = conn;
            }
            catch { return false; }
            return true;
        }

        /// <summary>
        /// 执行sqlite查询语句，并返回一个 DataTable
        /// </summary>
        /// <param name="sqliteStr"></param>
        /// <returns></returns>
        public DataTable ExcuteSql(string sqliteStr)
        {
            try
            {
                if (SqlConn.State == ConnectionState.Closed)
                {
                    SqlConn.Open();  
                }

                
                var sqliteDp = new OleDbDataAdapter(sqliteStr, SqlConn) {SelectCommand = {CommandTimeout = 600000}};
                var sqliteds = new DataSet();
                sqliteDp.Fill(sqliteds);
                return sqliteds.Tables[0];
            }
            catch(Exception ex)
            {
                //byte[] ecgDataArray = Encoding.UTF8.GetBytes(sqliteStr.ToString() + "\r\n"+ex.ToString()+"\r\n");
                //ecgFileWrite(ecgDataArray, @"d:\log.txt");
                return null;
            }
        }

        private void ecgFileWrite(byte[] ecgDataArray, string FilePath)
        {
            FileStream fs = new FileStream(FilePath, FileMode.OpenOrCreate);
            fs.Position = fs.Length;
            //开始写入
            fs.Write(ecgDataArray, 0, ecgDataArray.Length);
            //清空缓冲区、关闭流
            fs.Flush();
            fs.Close();
        }
        /// <summary>
        /// Sqlite 添加数据的操作函数
        /// </summary>
        /// <param name="sqliteSQL"></param>
        /// <returns></returns>
        public bool SqlAdd(string sqliteSQL)
        {
            try
            {
                if (SqlConn.State == ConnectionState.Closed)
                    SqlConn.Open();
                var sqliteCmd = new OleDbCommand(sqliteSQL, SqlConn);
                sqliteCmd.ExecuteNonQuery();
                sqliteCmd.Dispose();
                SqlConn.Close();
            }
            catch { return false; }
            return true;
        }

        /// <summary>
        /// Sqlite 删除数据的操作函数
        /// </summary>
        /// <param name="sqliteSQL"></param>
        /// <returns></returns>
        public bool SqlDelete(string sqliteSQL)
        {
            try
            {
                if (SqlConn.State == ConnectionState.Closed)
                    SqlConn.Open();
                var sqliteCmd = new OleDbCommand(sqliteSQL, SqlConn);
                sqliteCmd.ExecuteNonQuery();
                sqliteCmd.Dispose();
                SqlConn.Close();
            }
            catch { return false; }
            return true;
        }

        /// <summary>
        /// Sqlite 更新数据的操作函数
        /// </summary>
        /// <param name="sqliteSQL"></param>
        /// <returns></returns>
        public bool SqlUpdate(string sqliteSQL)
        {
            try
            {
                if (SqlConn.State == ConnectionState.Closed)
                    SqlConn.Open();
                var sqliteCmd = new OleDbCommand(sqliteSQL, SqlConn);
                sqliteCmd.ExecuteNonQuery();
                sqliteCmd.Dispose();
                SqlConn.Close();
            }
            catch { return false; }
            return true;
        }

        /// <summary>
        /// 执行SQL语句函数
        /// </summary>
        /// <param name="sqlcmd">SQL语句</param>
        /// <param name="paras">SQL语句中的参数组</param>
        /// <returns>返回受影响记录条数</returns>
        public int ExecuteSql(string sqlcmd, params SqlParameter[] paras)
        {

            var cmd = new OleDbCommand(sqlcmd, SqlConn);
            if (SqlConn.State == ConnectionState.Closed)
            {
                SqlConn.Open();
            }

            foreach (SqlParameter p in paras)
            {
                cmd.Parameters.Add(p);
            }

            int cnt = cmd.ExecuteNonQuery();
            SqlConn.Close();
            return cnt;
        }




        /// <summary>
        /// Sqlite 执行数据库的多条语句,
        /// </summary>
        /// <param name="sqliteSQL"></param>
        /// <returns></returns>
        public bool SqlExecuteNonQuery(string[] sqliteSQL)
        {

            if (SqlConn.State == ConnectionState.Closed)
            {
                SqlConn.Open();
            }

            OleDbTransaction sqlTran = SqlConn.BeginTransaction();
            try
            {
                foreach (string sql in sqliteSQL)
                {
                    var sqliteCmd = new OleDbCommand(sql, SqlConn, sqlTran);
                    int i = sqliteCmd.ExecuteNonQuery();
                    sqliteCmd.Dispose();
                }
                sqlTran.Commit();
            }
            catch
            {
                sqlTran.Rollback();
                return false;
            }
            finally
            {

                SqlConn.Close();
            }
            return true;
        }

        public Image GetImg(byte[] imgBytes)
        {
            var ms = new MemoryStream(imgBytes);
            Image img = Image.FromStream(ms);
            return img;
        }
    }
}