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

namespace FreeSql.PostgreSQL.Curd {

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

		public override int ExecuteAffrows() => base.SplitExecuteAffrows(5000, 3000);
		public override Task<int> ExecuteAffrowsAsync() => base.SplitExecuteAffrowsAsync(5000, 3000);
		public override long ExecuteIdentity() => base.SplitExecuteIdentity(5000, 3000);
		public override Task<long> ExecuteIdentityAsync() => base.SplitExecuteIdentityAsync(5000, 3000);
		public override List<T1> ExecuteInserted() => base.SplitExecuteInserted(5000, 3000);
		public override Task<List<T1>> ExecuteInsertedAsync() => base.SplitExecuteInsertedAsync(5000, 3000);


		protected override long RawExecuteIdentity() {
			var sql = this.ToSql();
			if (string.IsNullOrEmpty(sql)) return 0;

			long ret = 0;
			Exception exception = null;
			Aop.CurdBeforeEventArgs before = null;

			var identCols = _table.Columns.Where(a => a.Value.Attribute.IsIdentity == true);
			if (identCols.Any() == false) {
				before = new Aop.CurdBeforeEventArgs(_table.Type, Aop.CurdType.Insert, sql, _params);
				_orm.Aop.CurdBefore?.Invoke(this, before);
				try {
					ret = _orm.Ado.ExecuteNonQuery(_connection, _transaction, CommandType.Text, sql, _params);
				} catch (Exception ex) {
					exception = ex;
					throw ex;
				} finally {
					var after = new Aop.CurdAfterEventArgs(before, exception, ret);
					_orm.Aop.CurdAfter?.Invoke(this, after);
				}
				this.ClearData();
				return 0;
			}
			sql = string.Concat(sql, " RETURNING ", _commonUtils.QuoteSqlName(identCols.First().Value.Attribute.Name));
			before = new Aop.CurdBeforeEventArgs(_table.Type, Aop.CurdType.Insert, sql, _params);
			_orm.Aop.CurdBefore?.Invoke(this, before);
			try {
				long.TryParse(string.Concat(_orm.Ado.ExecuteScalar(_connection, _transaction, CommandType.Text, sql, _params)), out ret);
			} catch (Exception ex) {
				exception = ex;
				throw ex;
			} finally {
				var after = new Aop.CurdAfterEventArgs(before, exception, ret);
				_orm.Aop.CurdAfter?.Invoke(this, after);
			}
			this.ClearData();
			return ret;
		}
		async protected override Task<long> RawExecuteIdentityAsync() {
			var sql = this.ToSql();
			if (string.IsNullOrEmpty(sql)) return 0;

			long ret = 0;
			Exception exception = null;
			Aop.CurdBeforeEventArgs before = null;

			var identCols = _table.Columns.Where(a => a.Value.Attribute.IsIdentity == true);
			if (identCols.Any() == false) {
				before = new Aop.CurdBeforeEventArgs(_table.Type, Aop.CurdType.Insert, sql, _params);
				_orm.Aop.CurdBefore?.Invoke(this, before);
				try {
					ret = await _orm.Ado.ExecuteNonQueryAsync(_connection, _transaction, CommandType.Text, sql, _params);
				} catch (Exception ex) {
					exception = ex;
					throw ex;
				} finally {
					var after = new Aop.CurdAfterEventArgs(before, exception, ret);
					_orm.Aop.CurdAfter?.Invoke(this, after);
				}
				this.ClearData();
				return 0;
			}
			sql = string.Concat(sql, " RETURNING ", _commonUtils.QuoteSqlName(identCols.First().Value.Attribute.Name));
			before = new Aop.CurdBeforeEventArgs(_table.Type, Aop.CurdType.Insert, sql, _params);
			_orm.Aop.CurdBefore?.Invoke(this, before);
			try {
				long.TryParse(string.Concat(await _orm.Ado.ExecuteScalarAsync(_connection, _transaction, CommandType.Text, sql, _params)), out ret);
			} catch (Exception ex) {
				exception = ex;
				throw ex;
			} finally {
				var after = new Aop.CurdAfterEventArgs(before, exception, ret);
				_orm.Aop.CurdAfter?.Invoke(this, after);
			}
			this.ClearData();
			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(sql).Append(" RETURNING ");

			var colidx = 0;
			foreach (var col in _table.Columns.Values) {
				if (colidx > 0) sb.Append(", ");
				sb.Append(_commonUtils.QuoteReadColumn(col.Attribute.MapType, _commonUtils.QuoteSqlName(col.Attribute.Name))).Append(" as ").Append(_commonUtils.QuoteSqlName(col.CsName));
				++colidx;
			}
			sql = sb.ToString();
			var before = new Aop.CurdBeforeEventArgs(_table.Type, Aop.CurdType.Insert, sql, _params);
			_orm.Aop.CurdBefore?.Invoke(this, before);
			var ret = new List<T1>();
			Exception exception = null;
			try {
				ret = _orm.Ado.Query<T1>(_connection, _transaction, CommandType.Text, sql, _params);
			} catch (Exception ex) {
				exception = ex;
				throw ex;
			} finally {
				var after = new Aop.CurdAfterEventArgs(before, exception, ret);
				_orm.Aop.CurdAfter?.Invoke(this, after);
			}
			this.ClearData();
			return ret;
		}
		async protected override Task<List<T1>> RawExecuteInsertedAsync() {
			var sql = this.ToSql();
			if (string.IsNullOrEmpty(sql)) return new List<T1>();

			var sb = new StringBuilder();
			sb.Append(sql).Append(" RETURNING ");

			var colidx = 0;
			foreach (var col in _table.Columns.Values) {
				if (colidx > 0) sb.Append(", ");
				sb.Append(_commonUtils.QuoteReadColumn(col.Attribute.MapType, _commonUtils.QuoteSqlName(col.Attribute.Name))).Append(" as ").Append(_commonUtils.QuoteSqlName(col.CsName));
				++colidx;
			}
			sql = sb.ToString();
			var before = new Aop.CurdBeforeEventArgs(_table.Type, Aop.CurdType.Insert, sql, _params);
			_orm.Aop.CurdBefore?.Invoke(this, before);
			var ret = new List<T1>();
			Exception exception = null;
			try {
				ret = await _orm.Ado.QueryAsync<T1>(_connection, _transaction, CommandType.Text, sql, _params);
			} catch (Exception ex) {
				exception = ex;
				throw ex;
			} finally {
				var after = new Aop.CurdAfterEventArgs(before, exception, ret);
				_orm.Aop.CurdAfter?.Invoke(this, after);
			}
			this.ClearData();
			return ret;
		}
	}
}