using Dapper;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using MySql.Data.MySqlClient;
using System.Linq;
using System.Data.SqlClient;
using System.Collections;
using System.Reflection;

namespace JY.DAL
{
    public class SqlHelper<T> where T : class
    {
        /// <summary>
        /// 数据库连接字符串
        /// </summary>
        private static readonly string connectionString = ConfigurationManager.ConnectionStrings["SqlConn"].ConnectionString;

        /// <summary>
        /// 查询列表
        /// </summary>
        /// <param name="sql">查询的sql</param>
        /// <param name="param">替换参数</param>
        /// <returns></returns>
        public static List<T> Query(string sql, object param = null)
        {
            using (SqlConnection con = new SqlConnection(connectionString))
            {
                return con.Query<T>(sql, param).ToList();
            }
        }

        /// <summary>
        /// 查询第一个数据
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="param"></param>
        /// <returns></returns>
        public static T QueryFirst(string sql, object param = null)
        {
            using (SqlConnection con = new SqlConnection(connectionString))
            {
                return con.QueryFirst<T>(sql, param);
            }
        }

        /// <summary>
        /// 查询第一个数据没有返回默认值
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="param"></param>
        /// <returns></returns>
        public static T QueryFirstOrDefault(string sql, object param = null)
        {
            using (SqlConnection con = new SqlConnection(connectionString))
            {
                return con.QueryFirstOrDefault<T>(sql, param);
            }
        }

        /// <summary>
        /// 查询单条数据
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="param"></param>
        /// <returns></returns>
        public static T QuerySingle(string sql, object param = null)
        {
            using (SqlConnection con = new SqlConnection(connectionString))
            {
                return con.QuerySingle<T>(sql, param);
            }
        }

        /// <summary>
        /// 查询单条数据没有返回默认值
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="param"></param>
        /// <returns></returns>
        public static T QuerySingleOrDefault(string sql, object param = null)
        {
            using (SqlConnection con = new SqlConnection(connectionString))
            {
                return con.QuerySingleOrDefault<T>(sql, param);
            }
        }

        /// <summary>
        /// 增删改
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="param"></param>
        /// <returns>Number of rows affected</returns>
        public static int Execute(string sql, object param = null)
        {
            using (SqlConnection con = new SqlConnection(connectionString))
            {
                return con.Execute(sql, param);
            }
        }

        /// <summary>
        /// Reader获取数据
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="param"></param>
        /// <returns></returns>
        public static IDataReader ExecuteReader(string sql, object param)
        {
            using (SqlConnection con = new SqlConnection(connectionString))
            {
                return con.ExecuteReader(sql, param);
            }
        }

        /// <summary>
        /// 获取数据返回DataTable
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="param"></param>
        /// <returns></returns>
        public static DataTable QueryTable(string sql, object param = null)
        {
            using (SqlConnection con = new SqlConnection(connectionString))
            {
                DataTable table = new DataTable();
                var reader = con.ExecuteReader(sql, param);
                table.Load(reader);
                return table;
            }
        }

        /// <summary>
        /// Scalar获取数据
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="param"></param>
        /// <returns></returns>
        public static object ExecuteScalar(string sql, object param = null)
        {
            using (SqlConnection con = new SqlConnection(connectionString))
            {
                return con.ExecuteScalar(sql, param);
            }
        }

        /// <summary>
        /// Scalar获取数据
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="param"></param>
        /// <returns></returns>
        public static T ExecuteScalarForT(string sql, object param = null)
        {
            using (SqlConnection con = new SqlConnection(connectionString))
            {
                return con.ExecuteScalar<T>(sql, param);
            }
        }

        /// <summary>
        /// 带参数的存储过程
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="param"></param>
        /// <returns></returns>
        public static List<T> ExecutePro(string proc, object param = null)
        {
            using (SqlConnection con = new SqlConnection(connectionString))
            {
                List<T> list = con.Query<T>(proc,
                    param,
                    null,
                    true,
                    null,
                    CommandType.StoredProcedure).ToList();
                return list;
            }
        }
        /// <summary>
        /// 批量插入T数据，返回影响行数
        /// </summary>
        /// <param name="list">对象集合</param>
        /// <returns>影响行数</returns>
        public static int Insert(string strsql, List<T> list)
        {
            using (IDbConnection connection = new SqlConnection(connectionString))
            {
                //return connection.Execute("insert into Person(Name,Remark) values(@Name,@Remark)", list);
                return connection.Execute(strsql, list);
            }
        }



        /// <summary>
        /// list to datatable
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="collection"></param>
        /// <returns></returns>
        public static DataTable ListToDt(IEnumerable<T> collection)
        {
            var props = typeof(T).GetProperties();
            var dt = new DataTable();
            dt.Columns.AddRange(props.Select(p => new
            DataColumn(p.Name, p.PropertyType)).ToArray());
            if (collection.Count() > 0)
            {
                for (int i = 0; i < collection.Count(); i++)
                {
                    ArrayList tempList = new ArrayList();
                    foreach (PropertyInfo pi in props)
                    {
                        object obj = pi.GetValue(collection.ElementAt(i), null);
                        tempList.Add(obj);
                    }
                    object[] array = tempList.ToArray();
                    dt.LoadDataRow(array, true);
                }
            }
            return dt;
        }

        /// <summary>
        /// 批量插入SqlBulkCopy
        /// </summary>
        /// <param name="dt"></param>
        /// <param name="tableName">表名</param>
        public static void BatchInsertBySqlBulkCopy(DataTable dt, string tableName)
        {
            using (SqlBulkCopy sbc = new SqlBulkCopy(connectionString))
            {
                sbc.BatchSize = dt.Rows.Count;
                sbc.BulkCopyTimeout = 10;
                sbc.DestinationTableName = tableName;

                sbc.ColumnMappings.Clear();
                //sbc.ColumnMappings.Add("CustomerID", "CustomerID");
                //sbc.ColumnMappings.Add("FirstName", "FirstName");
                //sbc.ColumnMappings.Add("LastName", "LastName");
                //sbc.ColumnMappings.Add("Address1", "Address1");
                //sbc.ColumnMappings.Add("Address2", "Address2");
                for (int i = 0; i < dt.Columns.Count; i++)
                {
                    sbc.ColumnMappings.Add(dt.Columns[i].ColumnName, dt.Columns[i].ColumnName);
                }
                //全部写入数据库
                sbc.WriteToServer(dt);
            }
        }

        /// <summary>
        /// 批量插入数据
        /// </summary>
        /// <param name="dt"></param>
        public static int BulkToDB(string tableName, List<T> list)
        {
            //int result = 0;
            DataTable dt = ListToDt(list);
            BatchInsertBySqlBulkCopy(dt, tableName);
            return 1;
        }

        /// <summary>
        /// 事务1 - 全SQL
        /// </summary>
        /// <param name="sqlarr">多条SQL</param>
        /// <param name="param">param</param>
        /// <returns></returns>
        public static int ExecuteTransaction(string[] sqlarr)
        {
            using (SqlConnection con = new SqlConnection(connectionString))
            {
                con.Open();
                using (var transaction = con.BeginTransaction())
                {
                    try
                    {
                        int result = 0;
                        foreach (var sql in sqlarr)
                        {
                            result += con.Execute(sql, null, transaction);
                        }

                        transaction.Commit();
                        return result;
                    }
                    catch (Exception ex)
                    {
                        transaction.Rollback();
                        throw ex;
                    }
                    finally
                    {
                        con.Close();
                    }
                }
            }
        }

        /// <summary>
        /// 事务2 - 声明参数
        ///demo:
        ///dic.Add("Insert into Users values (@UserName, @Email, @Address)",
        ///        new { UserName = "jack", Email = "380234234@qq.com", Address = "上海" });
        /// </summary>
        /// <param name="Key">多条SQL</param>
        /// <param name="Value">param</param>
        /// <returns></returns>
        public static int ExecuteTransaction(Dictionary<string, object> dic)
        {
            using (SqlConnection con = new SqlConnection(connectionString))
            {
                con.Open();
                using (var transaction = con.BeginTransaction())
                {
                    try
                    {
                        int result = 0;
                        foreach (var sql in dic)
                        {
                            result += con.Execute(sql.Key, sql.Value, transaction);
                        }

                        transaction.Commit();
                        return result;
                    }
                    catch (Exception ex)
                    {
                        transaction.Rollback();
                        throw ex;
                    }
                    finally
                    {
                        con.Close();
                    }
                }
            }
        }
    }
}