/*
** Zabbix
** Copyright (C) 2001-2021 Zabbix SIA
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** 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 General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
**/

package mysql

import (
	"context"
	"encoding/json"

	"zabbix.com/pkg/zbxerr"
)

func replicationDiscoveryHandler(ctx context.Context, conn MyClient, _ map[string]string,
	_ ...string) (interface{}, error) {
	res := make([]map[string]string, 0)

	rows, err := conn.Query(ctx, `SHOW SLAVE STATUS`)
	if err != nil {
		return nil, zbxerr.ErrorCannotFetchData.Wrap(err)
	}

	data, err := rows2data(rows)
	if err != nil {
		return nil, zbxerr.ErrorCannotFetchData.Wrap(err)
	}

	for _, row := range data {
		res = append(res, map[string]string{"Master_Host": row["Master_Host"]})
	}

	jsonRes, err := json.Marshal(res)
	if err != nil {
		return nil, zbxerr.ErrorCannotMarshalJSON.Wrap(err)
	}

	return string(jsonRes), nil
}
