/*
Real-time Online/Offline Charging System (OCS) 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 engine

import (
	"encoding/csv"
	"io"
	"log"
	"os"
	"strings"

	"github.com/cgrates/cgrates/utils"
)

type CSVStorage struct {
	sep        rune
	readerFunc func(string, rune, int) (*csv.Reader, *os.File, error)
	// file names
	destinationsFn           string
	ratesFn                  string
	destinationratesFn       string
	timingsFn                string
	destinationratetimingsFn string
	ratingprofilesFn         string
	sharedgroupsFn           string
	actionsFn                string
	actiontimingsFn          string
	actiontriggersFn         string
	accountactionsFn         string
	resProfilesFn            string
	statsFn                  string
	thresholdsFn             string
	filterFn                 string
	suppProfilesFn           string
	attributeProfilesFn      string
	chargerProfilesFn        string
	dispatcherProfilesFn     string
	dispatcherHostsFn        string
}

func NewFileCSVStorage(sep rune,
	destinationsFn, timingsFn, ratesFn, destinationratesFn,
	destinationratetimingsFn, ratingprofilesFn, sharedgroupsFn,
	actionsFn, actiontimingsFn, actiontriggersFn, accountactionsFn,
	resProfilesFn, statsFn, thresholdsFn,
	filterFn, suppProfilesFn, attributeProfilesFn,
	chargerProfilesFn, dispatcherProfilesFn, dispatcherHostsFn string) *CSVStorage {
	return &CSVStorage{
		sep:                      sep,
		readerFunc:               openFileCSVStorage,
		destinationsFn:           destinationsFn,
		timingsFn:                timingsFn,
		ratesFn:                  ratesFn,
		destinationratesFn:       destinationratesFn,
		destinationratetimingsFn: destinationratetimingsFn,
		ratingprofilesFn:         ratingprofilesFn,
		sharedgroupsFn:           sharedgroupsFn,
		actionsFn:                actionsFn,
		actiontimingsFn:          actiontimingsFn,
		actiontriggersFn:         actiontriggersFn,
		accountactionsFn:         accountactionsFn,
		resProfilesFn:            resProfilesFn,
		statsFn:                  statsFn,
		thresholdsFn:             thresholdsFn,
		filterFn:                 filterFn,
		suppProfilesFn:           suppProfilesFn,
		attributeProfilesFn:      attributeProfilesFn,
		chargerProfilesFn:        chargerProfilesFn,
		dispatcherProfilesFn:     dispatcherProfilesFn,
		dispatcherHostsFn:        dispatcherHostsFn,
	}
}

func NewStringCSVStorage(sep rune,
	destinationsFn, timingsFn, ratesFn, destinationratesFn,
	destinationratetimingsFn, ratingprofilesFn, sharedgroupsFn,
	actionsFn, actiontimingsFn, actiontriggersFn,
	accountactionsFn, resProfilesFn, statsFn,
	thresholdsFn, filterFn, suppProfilesFn,
	attributeProfilesFn, chargerProfilesFn,
	dispatcherProfilesFn, dispatcherHostsFn string) *CSVStorage {
	c := NewFileCSVStorage(sep, destinationsFn, timingsFn,
		ratesFn, destinationratesFn, destinationratetimingsFn,
		ratingprofilesFn, sharedgroupsFn, actionsFn,
		actiontimingsFn, actiontriggersFn, accountactionsFn,
		resProfilesFn, statsFn, thresholdsFn, filterFn,
		suppProfilesFn, attributeProfilesFn, chargerProfilesFn,
		dispatcherProfilesFn, dispatcherHostsFn)
	c.readerFunc = openStringCSVStorage
	return c
}

func openFileCSVStorage(fn string, comma rune,
	nrFields int) (csvReader *csv.Reader, fp *os.File, err error) {
	fp, err = os.Open(fn)
	if err != nil {
		return
	}
	csvReader = csv.NewReader(fp)
	csvReader.Comma = comma
	csvReader.Comment = utils.COMMENT_CHAR
	csvReader.FieldsPerRecord = nrFields
	csvReader.TrailingComma = true
	return
}

func openStringCSVStorage(data string, comma rune,
	nrFields int) (csvReader *csv.Reader, fp *os.File, err error) {
	csvReader = csv.NewReader(strings.NewReader(data))
	csvReader.Comma = comma
	csvReader.Comment = utils.COMMENT_CHAR
	csvReader.FieldsPerRecord = nrFields
	csvReader.TrailingComma = true
	return
}

func (csvs *CSVStorage) proccesData(listType interface{}, fns []string, process func(interface{})) error {
	collumnCount := getColumnCount(listType)
	for _, fileName := range fns {
		csvReader, fp, err := csvs.readerFunc(fileName, csvs.sep, collumnCount)
		if err != nil {
			// maybe a log to view if failed to open file
			continue // try read the rest
		}
		if err = func() error { // to execute defer corectly
			if fp != nil {
				defer fp.Close()
			}
			for record, err := csvReader.Read(); err != io.EOF; record, err = csvReader.Read() {
				if err != nil {
					log.Printf("bad line in %s, %s\n", fileName, err.Error())
					return err
				}
				if item, err := csvLoad(listType, record); err != nil {
					log.Printf("error loading %s: %v", "", err)
					return err
				} else {
					process(item)
				}
			}
			return nil
		}(); err != nil {
			return err
		}
	}
	return nil
}

func (csvs *CSVStorage) GetTPTimings(tpid, id string) ([]*utils.ApierTPTiming, error) {
	var tpTimings TpTimings
	if err := csvs.proccesData(TpTiming{}, []string{csvs.timingsFn}, func(tp interface{}) {
		tm := tp.(TpTiming)
		tm.Tpid = tpid
		tpTimings = append(tpTimings, tm)
	}); err != nil {
		return nil, err
	}
	return tpTimings.AsTPTimings(), nil
}

func (csvs *CSVStorage) GetTPDestinations(tpid, id string) ([]*utils.TPDestination, error) {
	var tpDests TpDestinations
	if err := csvs.proccesData(TpDestination{}, []string{csvs.destinationsFn}, func(tp interface{}) {
		d := tp.(TpDestination)
		d.Tpid = tpid
		tpDests = append(tpDests, d)
	}); err != nil {
		return nil, err
	}
	return tpDests.AsTPDestinations(), nil
}

func (csvs *CSVStorage) GetTPRates(tpid, id string) ([]*utils.TPRate, error) {
	var tpRates TpRates
	if err := csvs.proccesData(TpRate{}, []string{csvs.ratesFn}, func(tp interface{}) {
		r := tp.(TpRate)
		r.Tpid = tpid
		tpRates = append(tpRates, r)
	}); err != nil {
		return nil, err
	}
	return tpRates.AsTPRates()
}

func (csvs *CSVStorage) GetTPDestinationRates(tpid, id string, p *utils.Paginator) ([]*utils.TPDestinationRate, error) {
	var tpDestinationRates TpDestinationRates
	if err := csvs.proccesData(TpDestinationRate{}, []string{csvs.destinationratesFn}, func(tp interface{}) {
		dr := tp.(TpDestinationRate)
		dr.Tpid = tpid
		tpDestinationRates = append(tpDestinationRates, dr)
	}); err != nil {
		return nil, err
	}
	return tpDestinationRates.AsTPDestinationRates()
}

func (csvs *CSVStorage) GetTPRatingPlans(tpid, id string, p *utils.Paginator) ([]*utils.TPRatingPlan, error) {
	var tpRatingPlans TpRatingPlans
	if err := csvs.proccesData(TpRatingPlan{}, []string{csvs.destinationratetimingsFn}, func(tp interface{}) {
		rp := tp.(TpRatingPlan)
		rp.Tpid = tpid
		tpRatingPlans = append(tpRatingPlans, rp)
	}); err != nil {
		return nil, err
	}
	return tpRatingPlans.AsTPRatingPlans()
}

func (csvs *CSVStorage) GetTPRatingProfiles(filter *utils.TPRatingProfile) ([]*utils.TPRatingProfile, error) {
	var tpRatingProfiles TpRatingProfiles
	if err := csvs.proccesData(TpRatingProfile{}, []string{csvs.ratingprofilesFn}, func(tp interface{}) {
		rpf := tp.(TpRatingProfile)
		if filter != nil {
			rpf.Tpid = filter.TPid
			rpf.Loadid = filter.LoadId
		}
		tpRatingProfiles = append(tpRatingProfiles, rpf)
	}); err != nil {
		return nil, err
	}
	return tpRatingProfiles.AsTPRatingProfiles()
}

func (csvs *CSVStorage) GetTPSharedGroups(tpid, id string) ([]*utils.TPSharedGroups, error) {
	var tpSharedGroups TpSharedGroups
	if err := csvs.proccesData(TpSharedGroup{}, []string{csvs.sharedgroupsFn}, func(tp interface{}) {
		sg := tp.(TpSharedGroup)
		sg.Tpid = tpid
		tpSharedGroups = append(tpSharedGroups, sg)
	}); err != nil {
		return nil, err
	}
	return tpSharedGroups.AsTPSharedGroups()
}

func (csvs *CSVStorage) GetTPActions(tpid, id string) ([]*utils.TPActions, error) {
	var tpActions TpActions
	if err := csvs.proccesData(TpAction{}, []string{csvs.actionsFn}, func(tp interface{}) {
		a := tp.(TpAction)
		a.Tpid = tpid
		tpActions = append(tpActions, a)
	}); err != nil {
		return nil, err
	}
	return tpActions.AsTPActions()
}

func (csvs *CSVStorage) GetTPActionPlans(tpid, id string) ([]*utils.TPActionPlan, error) {
	var tpActionPlans TpActionPlans
	if err := csvs.proccesData(TpActionPlan{}, []string{csvs.actiontimingsFn}, func(tp interface{}) {
		ap := tp.(TpActionPlan)
		ap.Tpid = tpid
		tpActionPlans = append(tpActionPlans, ap)
	}); err != nil {
		return nil, err
	}
	return tpActionPlans.AsTPActionPlans()
}

func (csvs *CSVStorage) GetTPActionTriggers(tpid, id string) ([]*utils.TPActionTriggers, error) {
	var tpActionTriggers TpActionTriggers
	if err := csvs.proccesData(TpActionTrigger{}, []string{csvs.actiontriggersFn}, func(tp interface{}) {
		at := tp.(TpActionTrigger)
		at.Tpid = tpid
		tpActionTriggers = append(tpActionTriggers, at)
	}); err != nil {
		return nil, err
	}
	return tpActionTriggers.AsTPActionTriggers()
}

func (csvs *CSVStorage) GetTPAccountActions(filter *utils.TPAccountActions) ([]*utils.TPAccountActions, error) {
	var tpAccountActions TpAccountActions
	if err := csvs.proccesData(TpAccountAction{}, []string{csvs.accountactionsFn}, func(tp interface{}) {
		aa := tp.(TpAccountAction)
		if filter != nil {
			aa.Tpid = filter.TPid
			aa.Loadid = filter.LoadId
		}
		tpAccountActions = append(tpAccountActions, aa)
	}); err != nil {
		return nil, err
	}
	return tpAccountActions.AsTPAccountActions()
}

func (csvs *CSVStorage) GetTPResources(tpid, tenant, id string) ([]*utils.TPResourceProfile, error) {
	var tpResLimits TpResources
	if err := csvs.proccesData(TpResource{}, []string{csvs.resProfilesFn}, func(tp interface{}) {
		tpLimit := tp.(TpResource)
		tpLimit.Tpid = tpid
		tpResLimits = append(tpResLimits, &tpLimit)
	}); err != nil {
		return nil, err
	}
	return tpResLimits.AsTPResources(), nil
}

func (csvs *CSVStorage) GetTPStats(tpid, tenant, id string) ([]*utils.TPStatProfile, error) {
	var tpStats TpStats
	if err := csvs.proccesData(TpStat{}, []string{csvs.statsFn}, func(tp interface{}) {
		tPstats := tp.(TpStat)
		tPstats.Tpid = tpid
		tpStats = append(tpStats, &tPstats)
	}); err != nil {
		return nil, err
	}
	return tpStats.AsTPStats(), nil
}

func (csvs *CSVStorage) GetTPThresholds(tpid, tenant, id string) ([]*utils.TPThresholdProfile, error) {
	var tpThreshold TpThresholds
	if err := csvs.proccesData(TpThreshold{}, []string{csvs.thresholdsFn}, func(tp interface{}) {
		tHresholdCfg := tp.(TpThreshold)
		tHresholdCfg.Tpid = tpid
		tpThreshold = append(tpThreshold, &tHresholdCfg)
	}); err != nil {
		return nil, err
	}
	return tpThreshold.AsTPThreshold(), nil
}

func (csvs *CSVStorage) GetTPFilters(tpid, tenant, id string) ([]*utils.TPFilterProfile, error) {
	var tpFilter TpFilterS
	if err := csvs.proccesData(TpFilter{}, []string{csvs.filterFn}, func(tp interface{}) {
		fIlterCfg := tp.(TpFilter)
		fIlterCfg.Tpid = tpid
		tpFilter = append(tpFilter, &fIlterCfg)
	}); err != nil {
		return nil, err
	}
	return tpFilter.AsTPFilter(), nil
}

func (csvs *CSVStorage) GetTPSuppliers(tpid, tenant, id string) ([]*utils.TPSupplierProfile, error) {
	var tpSPPs TpSuppliers
	if err := csvs.proccesData(TpSupplier{}, []string{csvs.suppProfilesFn}, func(tp interface{}) {
		suppProfile := tp.(TpSupplier)
		suppProfile.Tpid = tpid
		tpSPPs = append(tpSPPs, &suppProfile)
	}); err != nil {
		return nil, err
	}
	return tpSPPs.AsTPSuppliers(), nil
}

func (csvs *CSVStorage) GetTPAttributes(tpid, tenant, id string) ([]*utils.TPAttributeProfile, error) {
	var tpAls TPAttributes
	if err := csvs.proccesData(TPAttribute{}, []string{csvs.attributeProfilesFn}, func(tp interface{}) {
		attributeProfile := tp.(TPAttribute)
		attributeProfile.Tpid = tpid
		tpAls = append(tpAls, &attributeProfile)
	}); err != nil {
		return nil, err
	}
	return tpAls.AsTPAttributes(), nil
}

func (csvs *CSVStorage) GetTPChargers(tpid, tenant, id string) ([]*utils.TPChargerProfile, error) {
	var tpCPPs TPChargers
	if err := csvs.proccesData(TPCharger{}, []string{csvs.chargerProfilesFn}, func(tp interface{}) {
		cpp := tp.(TPCharger)
		cpp.Tpid = tpid
		tpCPPs = append(tpCPPs, &cpp)
	}); err != nil {
		return nil, err
	}
	return tpCPPs.AsTPChargers(), nil
}

func (csvs *CSVStorage) GetTPDispatcherProfiles(tpid, tenant, id string) ([]*utils.TPDispatcherProfile, error) {
	var tpDPPs TPDispatcherProfiles
	if err := csvs.proccesData(TPDispatcherProfile{}, []string{csvs.dispatcherProfilesFn}, func(tp interface{}) {
		dpp := tp.(TPDispatcherProfile)
		dpp.Tpid = tpid
		tpDPPs = append(tpDPPs, &dpp)
	}); err != nil {
		return nil, err
	}
	return tpDPPs.AsTPDispatcherProfiles(), nil
}

func (csvs *CSVStorage) GetTPDispatcherHosts(tpid, tenant, id string) ([]*utils.TPDispatcherHost, error) {
	var tpDDHs TPDispatcherHosts
	if err := csvs.proccesData(TPDispatcherHost{}, []string{csvs.dispatcherHostsFn}, func(tp interface{}) {
		dpp := tp.(TPDispatcherHost)
		dpp.Tpid = tpid
		tpDDHs = append(tpDDHs, &dpp)
	}); err != nil {
		return nil, err
	}
	return tpDDHs.AsTPDispatcherHosts(), nil
}

func (csvs *CSVStorage) GetTpIds(colName string) ([]string, error) {
	return nil, utils.ErrNotImplemented
}

func (csvs *CSVStorage) GetTpTableIds(tpid, table string,
	distinct utils.TPDistinctIds, filters map[string]string, p *utils.PaginatorWithSearch) ([]string, error) {
	return nil, utils.ErrNotImplemented
}