// Copyright 2023 Dolthub, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package ast

import (
	vitess "github.com/dolthub/vitess/go/vt/sqlparser"

	"github.com/dolthub/doltgresql/postgres/parser/sem/tree"
)

// nodeRenameColumn handles *tree.RenameColumn nodes.
func nodeRenameColumn(ctx *Context, node *tree.RenameColumn) (*vitess.AlterTable, error) {
	if node == nil {
		return nil, nil
	}
	tableName, err := nodeTableName(ctx, &node.Table)
	if err != nil {
		return nil, err
	}
	return &vitess.AlterTable{
		Table: tableName,
		Statements: []*vitess.DDL{
			{
				Action:       vitess.AlterStr,
				ColumnAction: vitess.RenameStr,
				Table:        tableName,
				Column:       vitess.NewColIdent(string(node.Name)),
				ToColumn:     vitess.NewColIdent(string(node.NewName)),
				IfExists:     node.IfExists,
			},
		},
	}, nil
}