using Dapper;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web;
using VueWebApi.Models;

namespace VueWebApi.Tools
{
    public class DapperHelper
    {
        /// <summary>
        /// 创建数据库连接对象Sqlserver
        /// </summary>
        /// <returns></returns>
        public static IDbConnection sqlConnection()
        {
            //string sqlServerConnectString = "server=***;database=***;User=***;password=***;Connect Timeout=10000";
            string sqlServerConnectString = ConfigurationManager.AppSettings["DBServer"];

            IDbConnection connection = new SqlConnection(sqlServerConnectString);
            connection.Open();
            return connection;
        }

        /// <summary>
        /// Dapper查询返回List<T>
        /// </summary>
        /// <typeparam name="T">需要返回的对象类型</typeparam>
        /// <param name="sql">Sql语句</param>
        /// <param name="parm"></param>
        /// <returns></returns>
        public static List<T> select<T>(string sql, Object parm) where T : new()
        {

            List<T> list = null;
            using (IDbConnection conn = sqlConnection())
            {
                try
                {
                    list = conn.Query<T>(sql, parm).ToList<T>();
                }
                catch (Exception ex)
                {
                    //创建日志记录组件实例
                    LogHelper.WriteLog(ex);
                    throw ex;
                }
                
            }
            return list;
        }


        /// <summary>
        /// Dapper查询返回List字典对象  无需手动Wapper对象了 
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="parm"></param>
        /// <returns></returns>
        public static List<Dictionary<string, Object>> selectToDict(string sql, Object parm)
        {

            List<Dictionary<string, Object>> result = null;
            using (IDbConnection conn = sqlConnection())
            {
                try
                {
                    var menus = conn.Query(sql, parm).ToList();
                    result = JsonConvert.DeserializeObject<List<Dictionary<string, Object>>>(JsonConvert.SerializeObject(menus));
                }
                catch (Exception ex)
                {
                    //创建日志记录组件实例
                    LogHelper.WriteLog(ex);
                    throw ex;
                }
            }
            return result;
        }

        /// <summary>
        /// Dapper查询返回对象非List集合
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="sql"></param>
        /// <param name="parm"></param>
        /// <returns></returns>
        public static T selectToObject<T>(string sql, Object parm) where T : new()
        {
            T t = new T();
            //sql语句
            using (IDbConnection conn = sqlConnection())
            {
                try
                {
                    t = conn.Query<T>(sql, parm).Single<T>();
                }
                catch (Exception ex)
                {
                    //创建日志记录组件实例
                    LogHelper.WriteLog(ex);
                    throw ex;
                }
            }
            return t;
        }

        /// <summary>
        /// dapper通用分页函数
        /// </summary>
        /// <typeparam name="T">泛型集合实体类</typeparam>
        /// <param name="sql">查询语句</param>
        /// <param name="orderBy">排序（字段 DESC/ASC）</param>
        /// <param name="pageIndex">当前页</param>
        /// <param name="pageSize">当前页显示条数</param>
        /// <param name="total">结果集总数</param>
        /// <returns></returns>
        public static IEnumerable<T> GetPageList<T>(string sql,Object parm, string orderBy,string sort, int pageIndex, int pageSize, out int total)
        {
            try
            {
                int skip = 1;
                if (pageIndex > 0)
                {
                    skip = (pageIndex - 1) * pageSize + 1;
                }

                StringBuilder sb = new StringBuilder();
                sb.AppendFormat("SELECT COUNT(1) FROM ({0}) AS Result;", sql);
                sb.AppendFormat(@"SELECT *
                        FROM(SELECT *,ROW_NUMBER() OVER(ORDER BY {1} {2}) AS RowNum
                             FROM  ({0}) AS Temp) AS Result
                        WHERE  RowNum >= {3} AND RowNum <= {4}
                        ORDER BY {1} {2}", sql, orderBy, sort, skip, pageIndex * pageSize);

                using (IDbConnection conn = sqlConnection())
                {
                    using (var reader = conn.QueryMultiple(sb.ToString(), parm))
                    {
                        total = reader.ReadFirst<int>();
                        return reader.Read<T>();
                    }
                }
            }
            catch (Exception ex)
            {
                //创建日志记录组件实例
                LogHelper.WriteLog(ex);
                throw ex;
            }
           
        }

        /// <summary>
        /// Dapper查询返回datatable数据
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="parm"></param>
        /// <returns></returns>
        public static DataTable selectdata(string sql, Object parm)
        {
            //sql语句
            try
            {
                using (IDbConnection conn = sqlConnection())
                {
                    DataTable table = new DataTable();
                    var data = conn.ExecuteReader(sql, parm);
                    table.Load(data);
                    return table;
                }
            }
            catch (Exception ex)
            {
                //创建日志记录组件实例
                LogHelper.WriteLog(ex);
                throw ex;
            }
           
        }

        /// <summary>
        /// Dapper查询返回数据条数
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="parm"></param>
        /// <returns></returns>
        public static int selectcount(string sql, Object parm)
        {
            //sql语句
            int result = 0;
            try
            {
                using (IDbConnection conn = sqlConnection())
                {
                    result = conn.Query(sql, parm).Count();
                }
                return result;
            }
            catch (Exception ex)
            {
                //创建日志记录组件实例
                LogHelper.WriteLog(ex);
                throw ex;
            }
        }

        /// <summary>
        /// Dapper增删改
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="parametere"></param>
        /// <returns></returns>
        public static int SQL(string sql,Object parametere)
        {
            //sql语句
            int result = 0;
            try
            {
                using (IDbConnection conn = sqlConnection())
                {
                    result = conn.Execute(sql, parametere);
                }
                return result;
            }
            catch (Exception ex)
            {
                //创建日志记录组件实例
                LogHelper.WriteLog(ex);
                throw ex;
            }   
        }

        /// <summary>
        /// 增加，删除，修改使用的 事务方法  Sqllist为依次执行
        /// </summary>
        /// <param name="sqlList"></param>
        /// <returns></returns>
        public static bool DoTransaction(List<object> sqlList)
        {
            bool result;
            IDbTransaction tranction = null;
            using (IDbConnection conn = sqlConnection())
            {
                try
                {
                    tranction = conn.BeginTransaction();
                    for (int i = 0; i < sqlList.Count; i++)
                    {
                        conn.Execute(sqlList[i].GetType().GetProperty("str").GetValue(sqlList[i], null).ToString(), sqlList[i].GetType().GetProperty("parm").GetValue(sqlList[i], null),tranction);
                    }
                    tranction.Commit();
                    result = true;
                }
                catch (Exception ex)
                {
                    //创建日志记录组件实例
                    LogHelper.WriteLog(ex);
                    result = false;
                    tranction.Rollback();
                    throw ex;
                }
                return result;
            }
        }


        /// <summary>
        /// Dapper插入 返回自增主键Id
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="parameter"></param>
        /// <param name="tableName">待插入数据的表名</param>
        /// <returns></returns>
        public static int insertReturnId(string sql, Object parameter, String tableName)
        {

            int result = 0;
            try
            {
                using (IDbConnection conn = sqlConnection())
                {
                    result = conn.Execute(sql, parameter);
                    if (result != 0)
                    {
                        result = conn.Query<int>("select ident_current(@table)", new { table = tableName }).Single<int>();
                    }
                }
                return result;
            }
            catch (Exception ex)
            { 
                //创建日志记录组件实例
                LogHelper.WriteLog(ex);
                throw ex;
            }
        }
    }
}