using System;
using System.Collections.Generic;
using System.Data.Common;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
using Dapper;
//ORM Save tools. First support SQLite and MySQL,In future we will support other Database who implement DBConnection.
namespace EGFramework
{
    public abstract class EGDapper : IEGSave, IEGSaveData, IEGDataBase
    {
        public DbConnection Connection { get; set; }
        public string ExceptionMsg;

        public abstract void InitSave(string conn);
        public IEnumerable<TData> GetAll<TData>(string dataKey) where TData : new()
        {
            IEnumerable<TData> result = Connection.Query<TData>("select * from " + dataKey);
            return result;
        }

        public IEnumerable<TData> GetPage<TData>(string dataKey, int pageIndex, int pageSize) where TData : new()
        {
            if (pageIndex <= 0)
            {
                pageIndex = 1;
            }
            int startPointer = (pageIndex - 1) * pageSize;
            IEnumerable<TData> result = Connection.Query<TData>("select * from " + dataKey + " limit " + startPointer + "," + pageSize);
            return result;
        }

        public TData GetData<TData>(string dataKey, object id) where TData : new()
        {
            TData result = Connection.QuerySingle<TData>("select * from " + dataKey + " where ID = @ID", new { ID = id });
            return result;
        }

        public IEnumerable<TData> FindData<TData>(string dataKey, Expression<Func<TData, bool>> expression) where TData : new()
        {
            IEnumerable<TData> sourceList = Connection.Query<TData>("select * from " + dataKey);
            return sourceList.Where(expression.Compile());
        }

        public IEnumerable<TData> FindData<TData>(string dataKey, string columnName, string keyWords) where TData : new()
        {
            IEnumerable<TData> sourceList = Connection.Query<TData>("select * from " + dataKey + " where " + columnName + " like " + "'%"+keyWords+"%'");
            return sourceList;
        }

        public void SetData<TData>(string dataKey, TData data, object id)
        {
            if (data == null)
            {
                throw new ArgumentNullException(nameof(data));
            }
            else
            {
                if (this.ContainsData(dataKey, id))
                {
                    UpdateData(dataKey, data, id);
                }
                else
                {
                    AddData(dataKey, data);
                }
                //EG.Print("data:" + data);
            }
        }

        public void AddData<TData>(string dataKey, TData data)
        {
            if (data == null)
            {
                throw new ArgumentNullException(nameof(data));
            }
            // throw new System.NotImplementedException();
            Type DataType = typeof(TData);
            var properties = DataType.GetProperties();
            var fields = DataType.GetFields();
            string keySet = "";
            string keySetParam = "";
            foreach (PropertyInfo key in properties)
            {
                if (key.Name == "ID" || key.Name == "Id" || key.Name == "id")
                {
                    continue;
                }
                if (DataType.IsPrimitive)
                {
                    keySet += key.Name + ",";
                    keySetParam += "@" + key.Name + ",";
                }
                else
                {
                    keySet += key.Name + ",";
                    keySetParam += "'" + key.GetValue(data).ToString() + "',";
                }
            }

            foreach (FieldInfo key in fields)
            {
                if (key.Name == "ID" || key.Name == "Id" || key.Name == "id")
                {
                    continue;
                }
                if (DataType.IsPrimitive)
                {
                    keySet += key.Name + ",";
                    keySetParam += "@" + key.Name + ",";
                }
                else
                {
                    keySet += key.Name + ",";
                    keySetParam += "'" + key.GetValue(data).ToString() + "',";
                }
            }
            
            keySet = keySet.TrimEnd(',');
            keySetParam = keySetParam.TrimEnd(',');
            int count = Connection.Execute(@"insert " + dataKey + "(" + keySet + ") values(" + keySetParam + ")", data);
            //EG.Print("count:" + count);
        }
        
        /// <summary>
        /// TData Must be all member to type of properties. such as 'public string Name { set; get; }'. Properties cannot be except string, primitive
        /// </summary>
        /// <param name="dataKey"></param>
        /// <param name="data"></param>
        /// <typeparam name="TData"></typeparam>
        public void AddData<TData>(string dataKey, IEnumerable<TData> data)
        {
            Type DataType = typeof(TData);
            var properties = DataType.GetProperties();
            string keySet = "";
            string keySetParam = "";
            foreach (PropertyInfo key in properties)
            {
                if (key.Name == "ID" || key.Name == "Id" || key.Name == "id")
                {
                    continue;
                }
                keySet += key.Name + ",";
                keySetParam += "@" + key.Name + ",";
            }

            keySet = keySet.TrimEnd(',');
            keySetParam = keySetParam.TrimEnd(',');
            string sql = @"insert " + dataKey + "(" + keySet + ") values(" + keySetParam + ")";
            EG.Print("sql:" + sql);
            int count = Connection.Execute(sql, data);
            //EG.Print("count:" + count);
        }
        public void AddData(string dataKey, Dictionary<string, object> data)
        {
            if (data == null)
            {
                throw new ArgumentNullException(nameof(data));
            }
            string keySet = "";
            string keySetParam = "";
            foreach (KeyValuePair<string, object> param in data)
            {
                if (param.Key == "ID" || param.Key == "Id" || param.Key == "id")
                {
                    continue;
                }
                keySet += param.Key + ",";
                if (param.Value is string)
                {
                    keySetParam += "'" + param.Value + "',";
                }
                else
                {
                    keySetParam += param.Value + ",";
                }
            }
            keySet = keySet.TrimEnd(',');
            keySetParam = keySetParam.TrimEnd(',');
            EG.Print("insert into " + dataKey + "(" + keySet + ") values(" + keySetParam + ")");
            int count = Connection.Execute("insert into " + dataKey + "(" + keySet + ") values(" + keySetParam + ")");
        }

        public void AddGroup(string datakey, List<Dictionary<string, object>> dataGroup)
        {
            foreach (Dictionary<string, object> data in dataGroup)
            {
                this.AddData(datakey, data);
            }
        }

        public int RemoveData(string dataKey, object id)
        {
            int count = Connection.Execute(@"delete from " + dataKey + " where id = @ID", new { ID = id });
            return count;
            //EG.Print("count:" + count);
        }

        public void UpdateData<TData>(string dataKey, TData data, object id)
        {
            if (data == null)
            {
                throw new ArgumentNullException(nameof(data));
            }
            Type DataType = typeof(TData);
            var properties = DataType.GetProperties();
            string keyMap = "";
            foreach (PropertyInfo key in properties)
            {
                if (key.Name == "ID" || key.Name == "id" || key.Name == "Id")
                {
                    continue;
                }
                keyMap += key.Name + " = @" + key.Name + ",";
            }
            keyMap = keyMap.TrimEnd(',');
            string sql = @"update " + dataKey + " set " + keyMap + " where ID = " + id;
            EG.Print(sql);
            int count = Connection.Execute(sql, data);
            //EG.Print("count:" + count);
        }

        public void UpdateData(string dataKey, Dictionary<string, object> data, object id)
        {
            if (data == null)
            {
                throw new ArgumentNullException(nameof(data));
            }
            string keyMap = "";
            foreach (KeyValuePair<string, object> param in data)
            {
                if (param.Key == "ID" || param.Key == "Id" || param.Key == "id")
                {
                    continue;
                }
                if (param.Value is string)
                {
                    keyMap += param.Key + " = '" + param.Value + "',";
                }
                else
                {
                    keyMap += param.Key + " = " + param.Value + ",";
                }
            }
            keyMap = keyMap.TrimEnd(',');
            if (id is string)
            {
                id = "'" + id + "'";
            }
            string sql = @"update " + dataKey + " set " + keyMap + " where ID = " + id;
            EG.Print(sql);
            int count = Connection.Execute(sql, data);
        }

        public virtual IEnumerable<string> GetKeys()
        {
            IEnumerable<string> result = Connection.Query<string>("show tables");
            return result;
        }

        public bool ContainsKey(string dataKey)
        {
            return GetKeys().Contains(dataKey);
        }

        public bool ContainsData(string dataKey, object id)
        {
            try
            {
                var result = Connection.QuerySingle("select * from " + dataKey + " where ID = @ID", new { ID = id });
                if (result == null)
                {
                    return false;
                }
                else
                {
                    return true;
                }
            }
            catch (System.Exception)
            {
                return false;
            }
        }

        public int GetDataCount(string dataKey)
        {
            int count = Connection.QuerySingle<int>("select COUNT(*) from " + dataKey);
            return count;
        }

        public DbConnection GetConnection()
        {
            return Connection;
        }

        public void CreateTable<TData>(string dataKey)
        {
            // throw new System.NotImplementedException();
            if (this.ContainsKey(dataKey))
            {
                EG.Print("Table " + dataKey + " has been created!");
                return;
            }
            string createSql = typeof(TData).ToCreateTableSQL(dataKey);
            int count = Connection.Execute(createSql);
        }

        public void CreateTable(string dataKey, Dictionary<string, object> tableParam)
        {
            if (this.ContainsKey(dataKey))
            {
                EG.Print("Table " + dataKey + " has been created!");
                return;
            }
            Dictionary<string, Type> tableType = new Dictionary<string, Type>();
            foreach (KeyValuePair<string, object> pair in tableParam)
            {
                tableType.Add(pair.Key, pair.Value.GetType());
            }
            string createSql = tableType.ToCreateTableSQL(dataKey);
            int count = Connection.Execute(createSql);
        }

        public void DropTable(string dataKey)
        {
            if (this.ContainsKey(dataKey))
            {
                Connection.Execute(@"DROP TABLE IF EXISTS "+dataKey+"");
            }
        }


    }
}