using Logs;
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Text;
using cuidian.Common;

namespace cuidian.Sql
{
    public class DbUtils
    {
        /// <summary>
        ///  返回第一行第一列
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="constr"></param>
        /// <returns></returns>
        public static object ExecuteScalar(string sql, SqlConnection con)
        {
            SqlCommand cmd = null;

            object rtn = null;
            try
            {
                if (con.State == System.Data.ConnectionState.Closed)
                    con.Open();

                cmd = new SqlCommand(__ProcessSql(sql), con);

                rtn = cmd.ExecuteScalar();
            }
            catch (Exception e)
            {
                LogHelper.Debug(e.Message, e);
                LogHelper.Debug("错误sql语句："+ sql);
                throw e;
            }
            finally
            {
                if (con.State == ConnectionState.Open) con.Close();
            }

            return rtn;
        }

        /// <summary>
        /// 返回语句执行受影响的
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="constr"></param>
        /// <returns></returns>
        public static int ExecuteNonQuery(string sql, SqlConnection con)
        {
            int rtn = 0;
            SqlCommand cmd;

            try
            {
                if (con.State == System.Data.ConnectionState.Closed)
                {
                    con.Open();
                }


                cmd = new SqlCommand(__ProcessSql(sql), con);

                rtn = cmd.ExecuteNonQuery();
            }
            catch (Exception ex)
            {
                LogHelper.Debug(ex.Message);
                LogHelper.Debug(sql);
                throw ex;
            }
            finally
            {
                if (con.State == ConnectionState.Open) con.Close();
            }
            return rtn;
        }

        /// <summary>
        /// 填充datatable
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="con"></param>
        /// <returns></returns>
        public static DataTable Fill(string sql, SqlConnection con)
        {
            SqlCommand cmd = new SqlCommand(__ProcessSql(sql), con);

            return Fill(cmd, con);
            
        }

        public static DataTable Fill(SqlCommand cmd, SqlConnection con)
        {
            DataTable dt = new DataTable();

            try
            {
                if (con.State == System.Data.ConnectionState.Closed)
                {
                    con.Open();
                }

                cmd.Connection = con;
                SqlDataAdapter da = new SqlDataAdapter(cmd);

                int i = da.Fill(dt);
            }
            catch (Exception e)
            {
                Logs.LogHelper.Debug(cmd.CommandText);
                Logs.LogHelper.Debug(e.Message, e);
                throw e;
            }
            finally
            {
                con.Close();
            }
            return dt;
        }

        public static DataSet Fill(Dictionary<string, string> sqls, SqlConnection con)
        {
            DataSet ds = new DataSet();

            SqlCommand cmd;    

            try
            {
                if (con.State == System.Data.ConnectionState.Closed)
                {
                    con.Open();
                }

                foreach (var item in sqls)
                {
                    cmd = new SqlCommand(item.Value, con);
                     DataTable dt = ds.Tables[item.Key];

                    if (dt == null)
                    {                        
                        dt = Fill(__ProcessSql( item.Value), con);
                        dt.TableName = item.Key;
                        ds.Tables.Add(dt);
                    }

                }                
            }
            catch (Exception e)
            {
                Logs.LogHelper.Debug(e.Message, e);
                throw e;
            }
            finally
            {
                con.Close();
            }

            return ds;
        }

        /// <summary>
        /// 处理特殊字符
        /// </summary>
        /// <param name="sql"></param>
        /// <returns></returns>
        private static string __ProcessSql(string sql)
        {
            //string rtn = sql.Replace("'", "''");

            return sql;
        }

        public static bool IsHaveObject(string name,EnumDataBaseOjbect type, string accId = "")
        {
            if(accId == "") accId =  AppSeting.Instance.GetValue("default");
            switch (type)
            {
                case EnumDataBaseOjbect.Procedure:
                    return __IsHaveProcedure(name,accId);
                    break;
                case EnumDataBaseOjbect.Table:
                    break;
                case EnumDataBaseOjbect.View:
                    break;
                default:
                    break;
            }
            return false;
        }

        private static bool __IsHaveProcedure(string name, string accid)
        {
            string sql = "select count(1) from sysobjects where id = object_id('{0}') and xtype='p'";

           string rtn = ExecuteScalar(string.Format(sql,name), ConnectionUtils.Instance.GetConnection(accid)).ToString();

            return rtn == "1";          
        }

        
    }
}