/*
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 (
	"errors"
	"fmt"

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

func CheckVersions(storage Storage) error {
x:=Versions{utils.Accounts: 2,utils.Actions: 2,utils.ActionTriggers: 2,utils.ActionPlans: 2,utils.SharedGroups: 2,utils.COST_DETAILS: 2}
	// get current db version
	if storage == nil {
		storage = dataStorage
	}
	dbVersion, err := storage.GetVersions(utils.TBLVersions)
	if err != nil {
			// no data, write version
			if err := storage.SetVersions(x,false); err != nil {
				utils.Logger.Warning(fmt.Sprintf("Could not write current version to db: %v", err))
			}

		
	} else {
		// comparing versions
		message:=dbVersion.Compare(x)
	if len(message) > 0 {
	
			// write the new values
	
	msg := "Migration needed: please backup cgr data and run : "+message
	
	utils.Logger.Crit(msg)
	
	return errors.New(msg)
	}
	}
	return nil
}


func (vers Versions)Compare(curent Versions) string{
x:=map[string]string{
	utils.Accounts: "cgr-migrator -migrate=*accounts",
	utils.Actions: "cgr-migrator -migrate=*actions",
	utils.ActionTriggers: "cgr-migrator -migrate=*action_triggers",
	utils.ActionPlans: "cgr-migrator -migrate=*action_plans",
	utils.SharedGroups: "cgr-migrator -migrate=*shared_groups",
	utils.COST_DETAILS: "cgr-migrator -migrate=*cost_details",
}
	for x,val :=range x{
		if vers[x]!=curent[x]{
		return val
		}
	}
	return ""
}


func CurrentStorDBVersions() Versions {
	return Versions{utils.COST_DETAILS: 2}
}

func CurrentDataDBVersions() Versions {
	return Versions{utils.Accounts: 2,utils.Actions: 2,utils.ActionTriggers: 2,utils.ActionPlans: 2,utils.SharedGroups: 2}
}

// Versions will keep trac of various item versions
type Versions map[string]int64 // map[item]versionNr