/*
Real-time Online/Offline Charging System (OerS) for Telecom & ISP environments
Copyright (C) ITsysCOM GmbH

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 3 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, see <http://www.gnu.org/licenses/>
*/

package ees

import (
	"github.com/cgrates/cgrates/config"
	"github.com/cgrates/cgrates/engine"
	"github.com/cgrates/cgrates/utils"
)

func NewVirtualExporter(cgrCfg *config.CGRConfig, cfgIdx int, filterS *engine.FilterS,
	dc *utils.SafeMapStorage) (vEe *VirtualEe, err error) {
	vEe = &VirtualEe{
		id:      cgrCfg.EEsCfg().Exporters[cfgIdx].ID,
		cgrCfg:  cgrCfg,
		cfgIdx:  cfgIdx,
		filterS: filterS,
		dc:      dc,
		reqs:    newConcReq(cgrCfg.EEsCfg().Exporters[cfgIdx].ConcurrentRequests),
	}
	err = vEe.init()
	return
}

// VirtualEe implements EventExporter interface for .csv files
type VirtualEe struct {
	id      string
	cgrCfg  *config.CGRConfig
	cfgIdx  int // index of config instance within ERsCfg.Readers
	filterS *engine.FilterS
	dc      *utils.SafeMapStorage
	reqs    *concReq
}

// init will create all the necessary dependencies, including opening the file
func (vEe *VirtualEe) init() (err error) {
	return
}

// ID returns the identificator of this exporter
func (vEe *VirtualEe) ID() string {
	return vEe.id
}

// OnEvicted implements EventExporter, doing the cleanup before exit
func (vEe *VirtualEe) OnEvicted(_ string, _ interface{}) {}

// ExportEvent implements EventExporter
func (vEe *VirtualEe) ExportEvent(cgrEv *utils.CGREvent) (err error) {
	vEe.reqs.get()
	defer func() {
		updateEEMetrics(vEe.dc, cgrEv.ID, cgrEv.Event, err != nil, utils.FirstNonEmpty(vEe.cgrCfg.EEsCfg().Exporters[vEe.cfgIdx].Timezone,
			vEe.cgrCfg.GeneralCfg().DefaultTimezone))
		vEe.reqs.done()
	}()
	vEe.dc.Lock()
	vEe.dc.MapStorage[utils.NumberOfEvents] = vEe.dc.MapStorage[utils.NumberOfEvents].(int64) + 1
	vEe.dc.Unlock()

	oNm := map[string]*utils.OrderedNavigableMap{
		utils.MetaExp: utils.NewOrderedNavigableMap(),
	}
	eeReq := engine.NewExportRequest(map[string]utils.DataStorage{
		utils.MetaReq:  utils.MapStorage(cgrEv.Event),
		utils.MetaDC:   vEe.dc,
		utils.MetaOpts: utils.MapStorage(cgrEv.APIOpts),
		utils.MetaCfg:  vEe.cgrCfg.GetDataProvider(),
	}, utils.FirstNonEmpty(cgrEv.Tenant, vEe.cgrCfg.GeneralCfg().DefaultTenant),
		vEe.filterS, oNm)
	if err = eeReq.SetFields(vEe.cgrCfg.EEsCfg().Exporters[vEe.cfgIdx].ContentFields()); err != nil {
		return
	}

	return
}

func (vEe *VirtualEe) GetMetrics() *utils.SafeMapStorage {
	return vEe.dc.Clone()
}