using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
namespace SqlSugar
{
    public partial class SqlSugarProvider
    {
        #region Properties
        public SqlSugarProvider Context
        {
            get
            {
                _Context = this;
                return _Context;
            }
            set
            {
                _Context = value;
            }
        }
        public SqlSugarClient Root { get; set; }
        public ConnectionConfig CurrentConnectionConfig { get; set; }
        public Dictionary<string, object> TempItems { get { if (_TempItems == null) { _TempItems = new Dictionary<string, object>(); }  return _TempItems; } set { _TempItems = value; } }
        public bool IsSystemTablesConfig { get { return this.CurrentConnectionConfig.InitKeyType == InitKeyType.SystemTable; } }
        public Guid ContextID { get; set; }
        public MappingTableList MappingTables { get; set; }
        public MappingColumnList MappingColumns { get; set; }
        public IgnoreColumnList IgnoreColumns { get; set; }
        public IgnoreColumnList IgnoreInsertColumns { get; set; }


        #endregion

        #region Fields       
        public Dictionary<string, object> _TempItems;
        public QueueList _Queues;
        protected ISqlBuilder _SqlBuilder;
        protected SqlSugarProvider _Context { get; set; }
        protected EntityMaintenance _EntityProvider;
        protected IAdo _Ado;
        protected ILambdaExpressions _LambdaExpressions;
        protected IContextMethods _RewritableMethods;
        protected IDbMaintenance _DbMaintenance;
        protected QueryFilterProvider _QueryFilterProvider;
        protected SimpleClient _SimpleClient;
        protected IAdo ContextAdo
        {
            get
            {
                return this._Ado;
            }
            set
            {
                this._Ado = value;
            }
        }
        protected IContextMethods ContextRewritableMethods
        {
            get
            {
                return this._RewritableMethods;
            }
            set
            {
                this._RewritableMethods = value;
            }
        }
        #endregion

        #region Init mappingInfo
        protected void InitMappingInfo<T, T2>()
        {
            InitMappingInfo<T>();
            InitMappingInfo<T2>();
        }
        protected void InitMappingInfo<T, T2, T3>()
        {
            InitMappingInfo<T, T2>();
            InitMappingInfo<T3>();
        }
        protected void InitMappingInfo<T, T2, T3, T4>()
        {
            InitMappingInfo<T, T2, T3>();
            InitMappingInfo<T4>();
        }
        protected void InitMappingInfo<T, T2, T3, T4, T5>()
        {
            InitMappingInfo<T, T2, T3, T4>();
            InitMappingInfo<T5>();
        }
        protected void InitMappingInfo<T, T2, T3, T4, T5, T6>()
        {
            InitMappingInfo<T, T2, T3, T4, T5>();
            InitMappingInfo<T6>();
        }
        protected void InitMappingInfo<T, T2, T3, T4, T5, T6, T7>()
        {
            InitMappingInfo<T, T2, T3, T4, T5, T6>();
            InitMappingInfo<T7>();
        }
        protected void InitMappingInfo<T, T2, T3, T4, T5, T6, T7, T8>()
        {
            InitMappingInfo<T, T2, T3, T4, T5, T6, T7>();
            InitMappingInfo<T8>();
        }

        #region 9-12
        protected void InitMappingInfo<T, T2, T3, T4, T5, T6, T7, T8, T9>()
        {
            InitMappingInfo<T, T2, T3, T4, T5, T6, T7, T8>();
            InitMappingInfo<T9>();
        }
        protected void InitMappingInfo<T, T2, T3, T4, T5, T6, T7, T8, T9, T10>()
        {
            InitMappingInfo<T, T2, T3, T4, T5, T6, T7, T8, T9>();
            InitMappingInfo<T10>();
        }
        protected void InitMappingInfo<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11>()
        {
            InitMappingInfo<T, T2, T3, T4, T5, T6, T7, T8, T9, T10>();
            InitMappingInfo<T11>();
        }
        protected void InitMappingInfo<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12>()
        {
            InitMappingInfo<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11>();
            InitMappingInfo<T12>();
        }
        #endregion

        public void InitMappingInfo<T>()
        {
            InitMappingInfo(typeof(T));
        }
        public void InitMappingInfo(Type type)
        {
            string cacheKey = "Context.InitAttributeMappingTables" + type.FullName;
            var entityInfo = this.Context.Utilities.GetReflectionInoCacheInstance().GetOrCreate<EntityInfo>(cacheKey,
              () =>
              {
                  var result = this.Context.EntityMaintenance.GetEntityInfo(type);
                  return result;
              });
            var copyObj = CopyEntityInfo(entityInfo);
            InitMappingInfo(copyObj);
        }

        private EntityInfo CopyEntityInfo(EntityInfo entityInfo)
        {
            EntityInfo result = new EntityInfo()
            {
                DbTableName = entityInfo.DbTableName,
                EntityName = entityInfo.EntityName,
                Type = entityInfo.Type
            };
            List<EntityColumnInfo> columns = new List<EntityColumnInfo>();
            if (entityInfo.Columns.HasValue())
            {
                foreach (var item in entityInfo.Columns)
                {
                    EntityColumnInfo column = new EntityColumnInfo()
                    {
                        ColumnDescription = item.ColumnDescription,
                        DataType = item.DataType,
                        DbColumnName = item.DbColumnName,
                        DbTableName = item.DbTableName,
                        DecimalDigits = item.DecimalDigits,
                        DefaultValue = item.DefaultValue,
                        EntityName = item.EntityName,
                        IsIdentity = item.IsIdentity,
                        IsIgnore = item.IsIgnore,
                        IsNullable = item.IsNullable,
                        IsOnlyIgnoreInsert = item.IsOnlyIgnoreInsert,
                        IsPrimarykey = item.IsPrimarykey,
                        Length = item.Length,
                        OldDbColumnName = item.OldDbColumnName,
                        OracleSequenceName = item.OracleSequenceName,
                        PropertyInfo = item.PropertyInfo,
                        PropertyName = item.PropertyName
                    };
                    columns.Add(item);
                }
            }
            result.Columns = columns;
            return result;
        }

        private void InitMappingInfo(EntityInfo entityInfo)
        {
            if (this.MappingTables == null)
                this.MappingTables = new MappingTableList();
            if (this.MappingColumns == null)
                this.MappingColumns = new MappingColumnList();
            if (this.IgnoreColumns == null)
                this.IgnoreColumns = new IgnoreColumnList();
            if (this.IgnoreInsertColumns == null)
                this.IgnoreInsertColumns = new IgnoreColumnList();
            if (!this.MappingTables.Any(it => it.EntityName == entityInfo.EntityName))
            {
                if (entityInfo.DbTableName != entityInfo.EntityName && entityInfo.DbTableName.HasValue())
                {
                    this.MappingTables.Add(entityInfo.EntityName, entityInfo.DbTableName);
                }
            }
            if (entityInfo.Columns.Any(it => it.EntityName == entityInfo.EntityName))
            {
                var mappingColumnInfos = this.MappingColumns.Where(it => it.EntityName == entityInfo.EntityName);
                foreach (var item in entityInfo.Columns.Where(it => it.IsIgnore == false))
                {
                    if (!mappingColumnInfos.Any(it => it.PropertyName == item.PropertyName))
                        if (item.PropertyName != item.DbColumnName && item.DbColumnName.HasValue())
                            this.MappingColumns.Add(item.PropertyName, item.DbColumnName, item.EntityName);
                }
                var ignoreInfos = this.IgnoreColumns.Where(it => it.EntityName == entityInfo.EntityName);
                foreach (var item in entityInfo.Columns.Where(it => it.IsIgnore))
                {
                    if (!ignoreInfos.Any(it => it.PropertyName == item.PropertyName))
                        this.IgnoreColumns.Add(item.PropertyName, item.EntityName);
                }

                var ignoreInsertInfos = this.IgnoreInsertColumns.Where(it => it.EntityName == entityInfo.EntityName);
                foreach (var item in entityInfo.Columns.Where(it => it.IsOnlyIgnoreInsert))
                {
                    if (!ignoreInsertInfos.Any(it => it.PropertyName == item.PropertyName))
                        this.IgnoreInsertColumns.Add(item.PropertyName, item.EntityName);
                }
            }
        }
        #endregion

        #region Create Instance
        protected ISugarQueryable<T> CreateQueryable<T>()
        {
            ISugarQueryable<T> result = InstanceFactory.GetQueryable<T>(this.CurrentConnectionConfig);
            return CreateQueryable(result);
        }
        protected ISugarQueryable<T> CreateQueryable<T>(ISugarQueryable<T> result)
        {
            Check.Exception(typeof(T).IsClass() == false || typeof(T).GetConstructors().Length == 0, "Queryable<{0}> Error ,{0} is invalid , need is a class,and can new().", typeof(T).Name);
            var sqlBuilder = InstanceFactory.GetSqlbuilder(CurrentConnectionConfig);
            result.Context = this.Context;
            result.SqlBuilder = sqlBuilder;
            result.SqlBuilder.QueryBuilder = InstanceFactory.GetQueryBuilder(CurrentConnectionConfig);
            result.SqlBuilder.QueryBuilder.Builder = sqlBuilder;
            result.SqlBuilder.Context = result.SqlBuilder.QueryBuilder.Context = this;
            result.SqlBuilder.QueryBuilder.EntityType = typeof(T);
            result.SqlBuilder.QueryBuilder.EntityName = typeof(T).Name;
            result.SqlBuilder.QueryBuilder.LambdaExpressions = InstanceFactory.GetLambdaExpressions(CurrentConnectionConfig);
            return result;
        }
        protected InsertableProvider<T> CreateInsertable<T>(T[] insertObjs) where T : class, new()
        {
            var result = InstanceFactory.GetInsertableProvider<T>(this.CurrentConnectionConfig);
            var sqlBuilder = InstanceFactory.GetSqlbuilder(this.CurrentConnectionConfig); ;
            result.Context = this;
            result.EntityInfo = this.Context.EntityMaintenance.GetEntityInfo<T>();
            result.SqlBuilder = sqlBuilder;
            result.InsertObjs = insertObjs;
            sqlBuilder.InsertBuilder = result.InsertBuilder = InstanceFactory.GetInsertBuilder(this.CurrentConnectionConfig);
            sqlBuilder.InsertBuilder.Builder = sqlBuilder;
            sqlBuilder.InsertBuilder.LambdaExpressions = InstanceFactory.GetLambdaExpressions(this.CurrentConnectionConfig);
            sqlBuilder.Context = result.SqlBuilder.InsertBuilder.Context = this;
            result.Init();
            return result;
        }
        protected DeleteableProvider<T> CreateDeleteable<T>() where T : class, new()
        {
            var result = InstanceFactory.GetDeleteableProvider<T>(this.CurrentConnectionConfig);
            var sqlBuilder = InstanceFactory.GetSqlbuilder(this.CurrentConnectionConfig); ;
            result.Context = this;
            result.SqlBuilder = sqlBuilder;
            sqlBuilder.DeleteBuilder = result.DeleteBuilder = InstanceFactory.GetDeleteBuilder(this.CurrentConnectionConfig);
            sqlBuilder.DeleteBuilder.Builder = sqlBuilder;
            sqlBuilder.DeleteBuilder.LambdaExpressions = InstanceFactory.GetLambdaExpressions(this.CurrentConnectionConfig);
            sqlBuilder.Context = result.SqlBuilder.DeleteBuilder.Context = this;
            return result;
        }
        protected UpdateableProvider<T> CreateUpdateable<T>(T[] UpdateObjs) where T : class, new()
        {
            var result = InstanceFactory.GetUpdateableProvider<T>(this.CurrentConnectionConfig);
            var sqlBuilder = InstanceFactory.GetSqlbuilder(this.CurrentConnectionConfig); ;
            result.Context = this;
            result.EntityInfo = this.Context.EntityMaintenance.GetEntityInfo<T>();
            result.SqlBuilder = sqlBuilder;
            result.UpdateObjs = UpdateObjs;
            sqlBuilder.UpdateBuilder = result.UpdateBuilder = InstanceFactory.GetUpdateBuilder(this.CurrentConnectionConfig);
            sqlBuilder.UpdateBuilder.Builder = sqlBuilder;
            sqlBuilder.UpdateBuilder.LambdaExpressions = InstanceFactory.GetLambdaExpressions(this.CurrentConnectionConfig);
            sqlBuilder.Context = result.SqlBuilder.UpdateBuilder.Context = this;
            result.Init();
            var ignoreColumns = result.EntityInfo.Columns.Where(it => it.IsOnlyIgnoreUpdate).ToList();
            if (ignoreColumns!=null&&ignoreColumns.Any())
            {
                result = (UpdateableProvider<T>)result.IgnoreColumns(ignoreColumns.Select(it=>it.PropertyName).ToArray());
            }
            return result;
        }

        protected void CreateQueryJoin<T>(Expression joinExpression, Type[] types, ISugarQueryable<T> queryable)
        {
            this.CreateQueryable<T>(queryable);
            string shortName = string.Empty;
            List<SugarParameter> paramters = new List<SugarParameter>();
            queryable.SqlBuilder.QueryBuilder.JoinQueryInfos = this.GetJoinInfos(queryable.SqlBuilder, joinExpression, ref paramters, ref shortName, types);
            queryable.SqlBuilder.QueryBuilder.TableShortName = shortName;
            queryable.SqlBuilder.QueryBuilder.JoinExpression = joinExpression;
            if (paramters != null)
            {
                queryable.SqlBuilder.QueryBuilder.Parameters.AddRange(paramters);
            }
        }
        protected void CreateEasyQueryJoin<T>(Expression joinExpression, Type[] types, ISugarQueryable<T> queryable)
        {
            this.CreateQueryable<T>(queryable);
            string shortName = string.Empty;
            queryable.SqlBuilder.QueryBuilder.EasyJoinInfos = this.GetEasyJoinInfo(joinExpression, ref shortName, queryable.SqlBuilder, types);
            queryable.SqlBuilder.QueryBuilder.TableShortName = shortName;
            queryable.SqlBuilder.QueryBuilder.JoinExpression = joinExpression;
        }
        #endregion

        #region Private methods
        private static void CheckDbDependency(ConnectionConfig config)
        {
            switch (config.DbType)
            {
                case DbType.MySql:
                    DependencyManagement.TryMySqlData();
                    break;
                case DbType.SqlServer:
                    break;
                case DbType.Sqlite:
                    DependencyManagement.TrySqlite();
                    break;
                case DbType.Oracle:
                    DependencyManagement.TryOracle();
                    break;
                case DbType.PostgreSQL:
                    DependencyManagement.TryPostgreSQL();
                    break;
                default:
                    throw new Exception("ConnectionConfig.DbType is null");
            }
        }
        protected List<JoinQueryInfo> GetJoinInfos(ISqlBuilder sqlBuilder, Expression joinExpression, ref List<SugarParameter> parameters, ref string shortName, params Type[] entityTypeArray)
        {
            List<JoinQueryInfo> result = new List<JoinQueryInfo>();
            var lambdaParameters = ((LambdaExpression)joinExpression).Parameters.ToList();
            ILambdaExpressions expressionContext = sqlBuilder.QueryBuilder.LambdaExpressions;
            expressionContext.MappingColumns = this.MappingColumns;
            expressionContext.MappingTables = this.MappingTables;
            if (this.Context.CurrentConnectionConfig.ConfigureExternalServices != null)
                expressionContext.SqlFuncServices = this.Context.CurrentConnectionConfig.ConfigureExternalServices.SqlFuncServices;
            expressionContext.Resolve(joinExpression, ResolveExpressType.Join);
            int i = 0;
            var joinArray = MergeJoinArray(expressionContext.Result.GetResultArray());
            if (joinArray == null) return null;
            parameters = expressionContext.Parameters;
            foreach (var entityType in entityTypeArray)
            {
                var isFirst = i == 0; ++i;
                JoinQueryInfo joinInfo = new JoinQueryInfo();
                var hasMappingTable = expressionContext.MappingTables.HasValue();
                MappingTable mappingInfo = null;
                if (hasMappingTable)
                {
                    mappingInfo = expressionContext.MappingTables.FirstOrDefault(it => it.EntityName.Equals(entityType.Name, StringComparison.CurrentCultureIgnoreCase));
                    joinInfo.TableName = mappingInfo != null ? mappingInfo.DbTableName : entityType.Name;
                }
                else
                {
                    joinInfo.TableName = entityType.Name;
                }
                if (isFirst)
                {
                    var firstItem = lambdaParameters.First();
                    lambdaParameters.Remove(firstItem);
                    shortName = firstItem.Name;
                }
                var joinString = joinArray[i * 2 - 2];
                joinInfo.ShortName = lambdaParameters[i - 1].Name;
                joinInfo.JoinType = (JoinType)Enum.Parse(typeof(JoinType), joinString);
                joinInfo.JoinWhere = joinArray[i * 2 - 1];
                joinInfo.JoinIndex = i;
                result.Add((joinInfo));
            }
            expressionContext.Clear();
            return result;
        }

        private string[] MergeJoinArray(string[] joinArray)
        {
            List<string> result = new List<string>();
            string joinValue = null;
            int i = 0;
            if (joinArray == null) return null;
            foreach (var item in joinArray)
            {
                ++i;
                var isLast = joinArray.Length == i;
                var isJoinType = item.IsIn(JoinType.Inner.ToString(), JoinType.Left.ToString(), JoinType.Right.ToString());
                if (isJoinType)
                {
                    if (joinValue != null)
                        result.Add(joinValue);
                    joinValue = null;
                    result.Add(item);
                }
                else
                {
                    isJoinType = false;
                    joinValue += joinValue == null ? item : ("," + item);
                }
                if (isLast)
                {
                    result.Add(joinValue);
                }
            }
            return result.ToArray(); ;
        }

        protected Dictionary<string, string> GetEasyJoinInfo(Expression joinExpression, ref string shortName, ISqlBuilder builder, params Type[] entityTypeArray)
        {
            Dictionary<string, string> result = new Dictionary<string, string>();
            var lambdaParameters = ((LambdaExpression)joinExpression).Parameters.ToList();
            shortName = lambdaParameters.First().Name;
            var index = 1;
            foreach (var item in entityTypeArray)
            {
                result.Add(UtilConstants.Space + lambdaParameters[index].Name, item.Name);
                ++index;
            }
            return result;
        }
        #endregion
    }
}