using System;
using System.Collections.Generic;
using System.Text;
using System.Text.RegularExpressions;
using Ant.Frame;
using Ant.Data;

namespace Ant.ORM
{
    class OleDbQueryCommandBuilder : QueryCommandBuilder
    {
        public override QueryCommand GetQueryCommand()
        {
            QueryCommand cmd = null;
            EntityPersistType str = (!object.Equals(PersistType, null)) ? PersistType : Md.PersistType;
            switch (str)
            {
                case EntityPersistType.Save:
                    cmd = ParserInsertCommand();
                    break;
                case EntityPersistType.Update:
                    cmd = ParserUpdateCommand();
                    break;
                case EntityPersistType.Delete:
                    cmd = ParserDeleteCommand();
                    break;
                case EntityPersistType.Query:
                    cmd = ParserSelectCommand();
                    break;
                case EntityPersistType.Sum:
                    cmd = ParserSumCommand();
                    break;
            }
            return cmd;
            
        }
        /// <summary>
        /// ½âÎöInsert SQL
        /// </summary>
        /// <returns></returns>
        private QueryCommand ParserInsertCommand()
        {
            QueryCommand qc = new QueryCommand();
            //StringBuilder sql = new StringBuilder();
            //sql.AppendFormat("INSERT INTO [{0}]",Md.FiledMeta.TableName);
            //List<string> columns = new List<string>();
            //List<string> param = new List<string>();
            //List<string> value = new List<string>();
            //foreach (string key in Fields.Keys)
            //{
            //    if (!Md.FiledMeta.FieldMeteDatas[key].IsAutoincrement)
            //    {
            //        columns.Add(string.Format("[{0}]", Md.FiledMeta.FieldMeteDatas[key].ColumnName));
            //        param.Add("@" + Md.FiledMeta.FieldMeteDatas[key].ColumnName);
            //        QueryParameter parameter = new QueryParameter();
            //        parameter.ParameterName = "@" + Md.FiledMeta.FieldMeteDatas[key].ColumnName;
            //        parameter.Value = Fields[key];
            //        qc.Parameters.Add(parameter);
            //        value.Add(string.Format("'{0}'", Fields[key].ToString()));
            //    }
            //}
            ////sql.AppendFormat("({0}) VALUES({1})", string.Join(",", columns.ToArray()), string.Join(",", param.ToArray()));
            //sql.AppendFormat("({0}) VALUES({1})", string.Join(",", columns.ToArray()), string.Join(",", param.ToArray()));

            //qc.CommandText = sql.ToString();
            return qc;
        }
        private QueryCommand ParserUpdateCommand()
        {
            QueryCommand qc = new QueryCommand();
            //StringBuilder sql = new StringBuilder();
            //sql.AppendFormat("UPDATE [{0}] SET ", Md.FiledMeta.TableName);
            //List<string> updateColumns = new List<string>();
            //List<string> condition = new List<string>();

            //foreach (string key in Fields.Keys)
            //{
            //    if (!Md.FiledMeta.FieldMeteDatas[key].IsPrimaryKey)
            //    {
            //        updateColumns.Add(string.Format("[{0}]=@{0}", Md.FiledMeta.FieldMeteDatas[key].ColumnName));
            //        qc.Parameters.Add("@" + Md.FiledMeta.FieldMeteDatas[key].ColumnName, Fields[key]);
            //    }                
            //}
            //foreach (string key in Fields.Keys)
            //{
            //    if (Md.FiledMeta.FieldMeteDatas[key].IsPrimaryKey)
            //    {
            //        condition.Add(string.Format("[{0}]=@{0}", Md.FiledMeta.FieldMeteDatas[key].ColumnName));
            //        qc.Parameters.Add("@" + Md.FiledMeta.FieldMeteDatas[key].ColumnName, Fields[key]);
            //    }
            //}
            
            //sql.Append(string.Join(",", updateColumns.ToArray())).Append(" WHERE ").Append(string.Join(" AND ", condition.ToArray()));
            //qc.CommandText = sql.ToString();
            return qc;
        }
        private QueryCommand ParserDeleteCommand()
        {
            QueryCommand qc = new QueryCommand();
            StringBuilder sql = new StringBuilder();
            //sql.AppendFormat("DELETE FROM [{0}]", Md.FiledMeta.TableName);
            //List<string> primaryKeys = new List<string>();
            //foreach (DataFieldMetaData df in Md.FiledMeta.FieldMeteDatas.Values)
            //{
            //    if (df.IsPrimaryKey)
            //    {
            //        primaryKeys.Add(string.Format("[{0}]=@{0}", df.ColumnName));
            //        qc.Parameters.Add("@" + df.ColumnName, df.ColumnType, Fields[df.PropertyName]);
            //    }
            //}
            //sql.AppendFormat("WHERE {0}", string.Join(" AND ", primaryKeys.ToArray()));
            //qc.CommandText = sql.ToString();
            return qc;
        }
        private QueryCommand ParserSelectCommand()
        {
            QueryCommand qc = new QueryCommand();
           
            //StringBuilder sql = new StringBuilder();
            //List<string> columns = new List<string>();
            //foreach (DataFieldMetaData df in Md.FiledMeta.FieldMeteDatas.Values)
            //{
            //    columns.Add(string.Format("[{0}]", df.ColumnName));
            //}
            //sql.AppendFormat("SELECT {0} FROM [{1}]", string.Join(",", columns.ToArray()), Md.FiledMeta.Table.Name);
            //if (!string.IsNullOrEmpty(Md.WhereSql))
            //{
            //    sql.AppendFormat(" WHERE {0}", Md.WhereSql);
            //}
            //qc.CommandText = sql.ToString();
            //qc.MaxRecords = PageSize;
            //qc.StartRecord = PageSize * PageNo;
            return qc;
        }
        private QueryCommand ParserSumCommand()
        {
            QueryCommand qc = new QueryCommand();
            StringBuilder sql = new StringBuilder();
            sql.AppendFormat("SELECT COUNT(*) FROM {0}", Md.FiledMeta.Table.Name);
            if (!string.IsNullOrEmpty(Md.WhereSql))
            {
                sql.AppendFormat(" WHERE {0}", Md.WhereSql);
            }
            qc.CommandText = sql.ToString();
            return qc;
        }

        /// <summary>
        /// ×ÔÔö³¤
        /// </summary>
        /// <returns></returns>
        public string GetLastInsertID()
        {
            return "SELECT @@IDENTITY;";
        }

    }
}