/*
Rating system designed to be used in VoIP Carriers World
Copyright (C) 2012  Radu Ioan Fericean

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 sessionmanager

import (
	"fmt"
	"log"
	"regexp"
)

// Event type holding a mapping of all event's proprieties
type Event struct {
	Fields map[string]string
}

var (
	eventBodyRE = regexp.MustCompile(`"(.*?)":\s+"(.*?)"`) // for parsing the proprieties
)

const (
	// Freswitch event proprities names
	CALL_DIRECTION = "Call-Direction"
	ORIG_ID        = "variable_sip_call_id" //- originator_id - match cdrs
	SUBJECT        = "variable_cgr_subject"
	DESTINATION    = "variable_cgr_destination"
	TOR            = "variable_cgr_tor"
	UUID           = "Unique-ID" // -Unique ID for this call leg
	CSTMID         = "variable_cgr_cstmid"
	START_TIME     = "Event-Date-GMT"
	NAME           = "Event-Name"
	HEARTBEAT      = "HEARTBEAT"
	ANSWER         = "CHANNEL_ANSWER"
	HANGUP         = "CHANNEL_HANGUP_COMPLETE"
)

// Creates a new event from a bod of text containing the key value proprieties.
// It stores the parsed proprieties in the internal map.
func NewEvent(body string) (ev *Event) {
	ev = &Event{Fields: make(map[string]string)}
	for _, fields := range eventBodyRE.FindAllStringSubmatch(body, -1) {
		if len(fields) == 3 {
			ev.Fields[fields[1]] = fields[2]
		} else {
			log.Printf("malformed event field: %v", fields)
		}
	}
	return
}

// Nice printing for the event object.
func (ev *Event) String() (result string) {
	for k, v := range ev.Fields {
		result += fmt.Sprintf("%s = %s\n", k, v)
	}
	result += "=============================================================="
	return
}