// Copyright © 2016 Abcum Ltd
//
// 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 db

import (
	"io"

	"github.com/abcum/surreal/sql"
)

func Execute(ast *sql.Query, err error) (interface{}, error) {

	if err != nil {
		return nil, err
	}

	var res []interface{}
	var stm interface{}

	for _, s := range ast.Statements {

		switch s.(type) {

		case *sql.SelectStatement:
			stm = executeSelectStatement(s)
		case *sql.CreateStatement:
			stm = executeCreateStatement(s)
		case *sql.UpdateStatement:
			stm = executeUpdateStatement(s)
		case *sql.ModifyStatement:
			stm = executeModifyStatement(s)
		case *sql.DeleteStatement:
			stm = executeDeleteStatement(s)
		case *sql.RelateStatement:
			stm = executeRelateStatement(s)
		case *sql.RecordStatement:
			stm = executeRecordStatement(s)

		case *sql.DefineViewStatement:
			stm = executeDefineStatement(s)
		case *sql.ResyncViewStatement:
			stm = executeResyncStatement(s)
		case *sql.RemoveViewStatement:
			stm = executeRemoveStatement(s)

		case *sql.DefineIndexStatement:
			stm = executeDefineStatement(s)
		case *sql.ResyncIndexStatement:
			stm = executeResyncStatement(s)
		case *sql.RemoveIndexStatement:
			stm = executeRemoveStatement(s)

		}

		res = append(res, stm)

	}

	return res, err

}

func ExecuteString(input string) (interface{}, error) {
	return Execute(sql.Parse(input))
}

func ExecuteBuffer(input io.Reader) (interface{}, error) {
	return Execute(sql.NewParser(input).Parse())
}