/*
goircd -- minimalistic simple Internet Relay Chat (IRC) server
Copyright (C) 2014-2020 Sergey Matveev <stargrave@stargrave.org>

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, version 3 of the License.

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 main

import (
	"fmt"
	"log"
	"os"
	"path"
	"time"
)

const (
	FormatMsg  = "[%s] <%s> %s\n"
	FormatMeta = "[%s] * %s %s\n"
)

var logSink chan LogEvent = make(chan LogEvent)

type LogEvent struct {
	where string
	who   string
	what  string
	meta  bool
}

func Logger(logdir string, events <-chan LogEvent) {
	mode := os.O_CREATE | os.O_WRONLY | os.O_APPEND
	perm := os.FileMode(permLogFile)
	var format string
	var logfile string
	var fd *os.File
	var err error
	for event := range events {
		logfile = path.Join(logdir, event.where+".log")
		fd, err = os.OpenFile(logfile, mode, perm)
		if err != nil {
			log.Println("can not open logfile", logfile, err)
			continue
		}
		if event.meta {
			format = FormatMeta
		} else {
			format = FormatMsg
		}
		_, err = fd.WriteString(fmt.Sprintf(
			format,
			time.Now().Format(time.RFC3339),
			event.who,
			event.what,
		))
		fd.Close()
		if err != nil {
			log.Println("error writing to logfile", logfile, err)
		}
	}
}