/*
** 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"
	"strings"

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

const (
	duration60sec = "2"
	duration15sec = "3"
)

func sysMetricsHandler(ctx context.Context, conn OraClient, params map[string]string,
	_ ...string) (interface{}, error) {
	var (
		sysmetrics string
		groupID    = duration60sec
	)

	switch params["Duration"] {
	case "15":
		groupID = duration15sec
	case "60":
		groupID = duration60sec
	default:
		return nil, zbxerr.ErrorInvalidParams
	}

	row, err := conn.QueryRow(ctx, `
		SELECT
			JSON_OBJECTAGG(METRIC_NAME VALUE ROUND(VALUE, 3) RETURNING CLOB)
		FROM
			V$SYSMETRIC
		WHERE
			GROUP_ID = :1
	`, groupID)
	if err != nil {
		return nil, zbxerr.ErrorCannotFetchData.Wrap(err)
	}

	err = row.Scan(&sysmetrics)
	if err != nil {
		return nil, zbxerr.ErrorCannotFetchData.Wrap(err)
	}

	// Add leading zeros for floats: ".03" -> "0.03".
	// Oracle JSON functions are not RFC 4627 compliant.
	// There should be a better way to do that, but I haven't come up with it ¯\_(ツ)_/¯
	sysmetrics = strings.ReplaceAll(sysmetrics, "\":.", "\":0.")

	return sysmetrics, nil
}