/*
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 utils

import (
	"fmt"
	"strconv"
	"strings"
)

type Blockers []*DynamicBlocker

// NewBlockersFromString will build the Blockers that contains slices of FilterIDs and Blocker from a single value. This process is helped by separators
func NewBlockersFromString(value, blkSep, fltrSep string) (blkrs Blockers, err error) {
	if len(value) == 0 {
		return Blockers{{}}, nil
	}
	valSeparated := strings.Split(value, blkSep)
	lenVals := len(valSeparated)
	if lenVals%2 != 0 {
		return nil, fmt.Errorf("invalid DynamicBlocker format for string <%s>", value)
	}
	for idx := 0; idx < lenVals; idx += 2 {
		var fltrIDs []string
		if len(valSeparated[idx]) != 0 {
			fltrIDs = strings.Split(valSeparated[idx], fltrSep)
		}
		var blocker bool
		if len(valSeparated[idx+1]) != 0 {
			if blocker, err = strconv.ParseBool(valSeparated[idx+1]); err != nil {
				return nil, fmt.Errorf("cannot convert bool with value: <%v> into Blocker", valSeparated[idx+1])
			}
		}
		blkrs = append(blkrs, &DynamicBlocker{FilterIDs: fltrIDs, Blocker: blocker})
	}
	return
}

// String
func (blkrs Blockers) String(blkSep, fltrSep string) (value string) {
	if len(blkrs) == 0 {
		return
	}
	strBlockers := make([]string, len(blkrs))
	for idx, val := range blkrs {
		strBlockers[idx] = val.String(blkSep, fltrSep)
	}
	return strings.Join(strBlockers, blkSep)
}

type DynamicBlocker struct {
	FilterIDs []string
	Blocker   bool
}

func (blckr DynamicBlocker) String(blkSep, fltrSep string) (out string) {
	blocker := "false"
	if blckr.Blocker == true {
		blocker = "true"
	}
	return strings.Join(blckr.FilterIDs, fltrSep) + blkSep + blocker
}