using FreeSql.Internal;
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Common;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace FreeSql.SqlServer.Curd
{

    class SqlServerInsert<T1> : Internal.CommonProvider.InsertProvider<T1> where T1 : class
    {
        public SqlServerInsert(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression)
            : base(orm, commonUtils, commonExpression)
        {
        }

        internal IFreeSql InternalOrm => _orm as IFreeSql;
        internal DbConnection InternalConnection => _connection;
        internal DbTransaction InternalTransaction => _transaction;

        public override int ExecuteAffrows() => base.SplitExecuteAffrows(_batchValuesLimit > 0 ? _batchValuesLimit : 1000, _batchParameterLimit > 0 ? _batchParameterLimit : 2100);
        public override long ExecuteIdentity() => base.SplitExecuteIdentity(_batchValuesLimit > 0 ? _batchValuesLimit : 1000, _batchParameterLimit > 0 ? _batchParameterLimit : 2100);
        public override List<T1> ExecuteInserted() => base.SplitExecuteInserted(_batchValuesLimit > 0 ? _batchValuesLimit : 1000, _batchParameterLimit > 0 ? _batchParameterLimit : 2100);

        public override string ToSql()
        {
            var versionGreaterThan10 = (_commonUtils as SqlServerUtils).ServerVersion > 10;
            return this.ToSqlValuesOrSelectUnionAll(versionGreaterThan10);
        }
        protected override long RawExecuteIdentity()
        {
            var sql = this.ToSql();
            if (string.IsNullOrEmpty(sql)) return 0;

            sql = string.Concat(sql, "; SELECT SCOPE_IDENTITY();");
            var before = new Aop.CurdBeforeEventArgs(_table.Type, _table, Aop.CurdType.Insert, sql, _params);
            _orm.Aop.CurdBeforeHandler?.Invoke(this, before);
            long ret = 0;
            Exception exception = null;
            try
            {
                long.TryParse(string.Concat(_orm.Ado.ExecuteScalar(_connection, _transaction, CommandType.Text, sql, _commandTimeout, _params)), out ret);
            }
            catch (Exception ex)
            {
                exception = ex;
                throw;
            }
            finally
            {
                var after = new Aop.CurdAfterEventArgs(before, exception, ret);
                _orm.Aop.CurdAfterHandler?.Invoke(this, after);
            }
            return ret;
        }
        protected override List<T1> RawExecuteInserted()
        {
            var sql = this.ToSql();
            if (string.IsNullOrEmpty(sql)) return new List<T1>();

            var sb = new StringBuilder();
            sb.Append(" OUTPUT ");
            var colidx = 0;
            foreach (var col in _table.Columns.Values)
            {
                if (colidx > 0) sb.Append(", ");
                sb.Append(_commonUtils.RereadColumn(col, $"INSERTED.{_commonUtils.QuoteSqlName(col.Attribute.Name)}")).Append(" as ").Append(_commonUtils.QuoteSqlName(col.CsName));
                ++colidx;
            }

            if ((_commonUtils as SqlServerUtils).ServerVersion > 10)
            {
                var validx = sql.IndexOf(") VALUES");
                if (validx == -1) throw new ArgumentException(CoreStrings.S_NotFound_Name("VALUES"));
                sb.Insert(0, sql.Substring(0, validx + 1));
                sb.Append(sql.Substring(validx + 1));
            }
            else
            {
                var validx = sql.IndexOf(") SELECT ");
                if (validx == -1) throw new ArgumentException(CoreStrings.S_NotFound_Name("SELECT"));
                sb.Insert(0, sql.Substring(0, validx + 1));
                sb.Append(sql.Substring(validx + 1));
            }

            sql = sb.ToString();
            var before = new Aop.CurdBeforeEventArgs(_table.Type, _table, Aop.CurdType.Insert, sql, _params);
            _orm.Aop.CurdBeforeHandler?.Invoke(this, before);
            var ret = new List<T1>();
            Exception exception = null;
            try
            {
                ret = _orm.Ado.Query<T1>(_table.TypeLazy ?? _table.Type, _connection, _transaction, CommandType.Text, sql, _commandTimeout, _params);
            }
            catch (Exception ex)
            {
                exception = ex;
                throw;
            }
            finally
            {
                var after = new Aop.CurdAfterEventArgs(before, exception, ret);
                _orm.Aop.CurdAfterHandler?.Invoke(this, after);
            }
            return ret;
        }

#if net40
#else
        public override Task<int> ExecuteAffrowsAsync(CancellationToken cancellationToken = default) => base.SplitExecuteAffrowsAsync(_batchValuesLimit > 0 ? _batchValuesLimit : 1000, _batchParameterLimit > 0 ? _batchParameterLimit : 2100, cancellationToken);
        public override Task<long> ExecuteIdentityAsync(CancellationToken cancellationToken = default) => base.SplitExecuteIdentityAsync(_batchValuesLimit > 0 ? _batchValuesLimit : 1000, _batchParameterLimit > 0 ? _batchParameterLimit : 2100, cancellationToken);
        public override Task<List<T1>> ExecuteInsertedAsync(CancellationToken cancellationToken = default) => base.SplitExecuteInsertedAsync(_batchValuesLimit > 0 ? _batchValuesLimit : 1000, _batchParameterLimit > 0 ? _batchParameterLimit : 2100, cancellationToken);

        async protected override Task<long> RawExecuteIdentityAsync(CancellationToken cancellationToken = default)
        {
            var sql = this.ToSql();
            if (string.IsNullOrEmpty(sql)) return 0;

            sql = string.Concat(sql, "; SELECT SCOPE_IDENTITY();");
            var before = new Aop.CurdBeforeEventArgs(_table.Type, _table, Aop.CurdType.Insert, sql, _params);
            _orm.Aop.CurdBeforeHandler?.Invoke(this, before);
            long ret = 0;
            Exception exception = null;
            try
            {
                long.TryParse(string.Concat(await _orm.Ado.ExecuteScalarAsync(_connection, _transaction, CommandType.Text, sql, _commandTimeout, _params, cancellationToken)), out ret);
            }
            catch (Exception ex)
            {
                exception = ex;
                throw;
            }
            finally
            {
                var after = new Aop.CurdAfterEventArgs(before, exception, ret);
                _orm.Aop.CurdAfterHandler?.Invoke(this, after);
            }
            return ret;
        }
        async protected override Task<List<T1>> RawExecuteInsertedAsync(CancellationToken cancellationToken = default)
        {
            var sql = this.ToSql();
            if (string.IsNullOrEmpty(sql)) return new List<T1>();

            var sb = new StringBuilder();
            sb.Append(" OUTPUT ");
            var colidx = 0;
            foreach (var col in _table.Columns.Values)
            {
                if (colidx > 0) sb.Append(", ");
                sb.Append(_commonUtils.RereadColumn(col, $"INSERTED.{_commonUtils.QuoteSqlName(col.Attribute.Name)}")).Append(" as ").Append(_commonUtils.QuoteSqlName(col.CsName));
                ++colidx;
            }

            if ((_commonUtils as SqlServerUtils).ServerVersion > 10)
            {
                var validx = sql.IndexOf(") VALUES");
                if (validx == -1) throw new ArgumentException(CoreStrings.S_NotFound_Name("VALUES"));
                sb.Insert(0, sql.Substring(0, validx + 1));
                sb.Append(sql.Substring(validx + 1));
            }
            else
            {
                var validx = sql.IndexOf(") SELECT ");
                if (validx == -1) throw new ArgumentException(CoreStrings.S_NotFound_Name("SELECT"));
                sb.Insert(0, sql.Substring(0, validx + 1));
                sb.Append(sql.Substring(validx + 1));
            }

            sql = sb.ToString();
            var before = new Aop.CurdBeforeEventArgs(_table.Type, _table, Aop.CurdType.Insert, sql, _params);
            _orm.Aop.CurdBeforeHandler?.Invoke(this, before);
            var ret = new List<T1>();
            Exception exception = null;
            try
            {
                ret = await _orm.Ado.QueryAsync<T1>(_table.TypeLazy ?? _table.Type, _connection, _transaction, CommandType.Text, sql, _commandTimeout, _params, cancellationToken);
            }
            catch (Exception ex)
            {
                exception = ex;
                throw;
            }
            finally
            {
                var after = new Aop.CurdAfterEventArgs(before, exception, ret);
                _orm.Aop.CurdAfterHandler?.Invoke(this, after);
            }
            return ret;
        }
#endif
    }
}