/* diodemail - send-only smtp server
 * Copyright (c) 2024 Gnarwhal
 *
 * This file is part of diodemail.
 *
 * diodemail 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.
 *
 * diodemail 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
 * diodemail. If not, see <https://www.gnu.org/licenses/>.
 */

package main

import (
	"flag"
	"crypto/tls"
	"os"
	"time"

	"github.com/rs/zerolog"
	"github.com/rs/zerolog/log"
	
	"forge.monodon.me/Gnarwhal/diodemail/smtp"
)

const Version = "1.0.0"

func main() {
	log.Logger = zerolog.
		New(zerolog.ConsoleWriter{Out: os.Stderr, TimeFormat: time.DateTime}).
		With().
		Timestamp().
		Logger().
		Level(zerolog.ErrorLevel)

	var config_path string
	var log_level   string

	flag.StringVar(
		&config_path,
		"config-file",
		"/etc/diodemail/config.json",
		"Path to config file",
	)
	flag.StringVar(
		&log_level,
		"log-level",
		"",
		"Maximum log level to log",
	)

	flag.Parse()
	config, err := LoadConfig(config_path)
	if err != nil {
		log.Fatal().Msgf("%v", err)
	}
	if log_level == "" {
		if config.LogLevel != "" {
			log_level = config.LogLevel
		} else {
			log_level = "info"
		}
	}

	parsed_log_level, err := zerolog.ParseLevel(log_level)
	if err != nil {
		log.Fatal().Msgf("%v", err)
	}

	log.Logger = zerolog.
		New(zerolog.ConsoleWriter{Out: os.Stderr, TimeFormat: time.DateTime}).
		With().
		Timestamp().
		Logger().
		Level(parsed_log_level)
	log.Info().Msgf("Starting diodemail v%v", Version)
	log.Info().Msgf("Loaded config from: %v", config_path)

	if config.Certificate.CertFile == "" || config.Certificate.KeyFile == "" {
		log.Fatal().Msgf(
			"Must provide CertFile (got '%v') and KeyFile (got '%v')",
			config.Certificate.CertFile,
			config.Certificate.KeyFile,
		)
	}

	certificate, err := tls.LoadX509KeyPair(
		config.Certificate.CertFile,
		config.Certificate.KeyFile,
	)
	if err != nil {
		log.Fatal().Msgf("Failed to load TLS config: %v", err)
	}

	if config.Auth.Enabled && config.Auth.PasswordHash == "" {
		log.Fatal().Msgf("Authentication is enabled but no password hash was supplied")
	}

	err = smtp.Run(
		config.Host,
		config.Ports.Plain,
		config.Ports.TLS,
		tls.Config{Certificates: []tls.Certificate{certificate}},
		config.Auth.Enabled,
		config.Auth.PasswordHash,
	)
	if err != nil {
		log.Fatal().Msgf("%v", err)
	}
}