/*
** Copyright (C) 2001-2025 Zabbix SIA
**
** This program is free software: you can redistribute it and/or modify it under the terms of
** the GNU Affero General Public License as published by the Free Software Foundation, version 3.
**
** This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
** without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
** See the GNU Affero General Public License for more details.
**
** You should have received a copy of the GNU Affero General Public License along with this program.
** If not, see <https://www.gnu.org/licenses/>.
**/

package oracle

import (
	"context"

	"golang.zabbix.com/sdk/errs"
	"golang.zabbix.com/sdk/zbxerr"
)

func cdbHandler(ctx context.Context, conn OraClient, params map[string]string, _ ...string) (interface{}, error) {
	var CDBInfo string

	query, args := getCDBQuery(params["Database"])

	row, err := conn.QueryRow(ctx, query, args...)
	if err != nil {
		return nil, errs.WrapConst(err, zbxerr.ErrorCannotFetchData)
	}

	err = row.Scan(&CDBInfo)
	if err != nil {
		return nil, errs.WrapConst(err, zbxerr.ErrorCannotFetchData)
	}

	if CDBInfo == "" {
		CDBInfo = "[]"
	}

	return CDBInfo, nil
}

func getCDBQuery(name string) (string, []any) {
	const query = `
	SELECT
		JSON_ARRAYAGG(
			JSON_OBJECT(NAME VALUE
				JSON_OBJECT(
					'open_mode' 	VALUE 
						DECODE(OPEN_MODE, 
							'MOUNTED',              1, 
							'READ ONLY',            2, 
							'READ WRITE',           3, 
							'READ ONLY WITH APPLY', 4, 
							'MIGRATE', 5, 
						0),
					'role' 			VALUE 
						DECODE(DATABASE_ROLE,
							'SNAPSHOT STANDBY', 1, 
							'LOGICAL STANDBY',  2, 
							'PHYSICAL STANDBY', 3, 
							'PRIMARY',          4, 
							'FAR SYNC', 5, 
						0),
					'force_logging' VALUE 
						DECODE(FORCE_LOGGING, 
							'YES', 1, 
							'NO' , 0, 
						0),
					'log_mode'      VALUE 
						DECODE(LOG_MODE, 
							'NOARCHIVELOG', 0,
							'ARCHIVELOG', 1, 
							'MANUAL', 2,
						0)
				)
			)
		)		
		FROM
			V$DATABASE`

	if name != "" {
		return query + " WHERE NAME = :1", []any{name}
	}

	return query, nil
}