/* SPDX-License-Identifier: GPL-2.0
 *
 * Copyright (C) 2021 Jason A. Donenfeld. All Rights Reserved.
 */

package main

import (
	"bufio"
	"flag"
	"fmt"
	"log"
	"net"
	"os"
	"regexp"
	"time"

	"golang.zx2c4.com/irc/hbot"
)

func main() {
	channelArg := flag.String("channel", "", "channel to join")
	serverArg := flag.String("server", "", "server and port")
	nickArg := flag.String("nick", "", "nickname")
	passwordArg := flag.String("password-file", "", "optional file with password")
	flag.Parse()
	if matched, _ := regexp.MatchString(`^#[a-zA-Z0-9_-]+$`, *channelArg); !matched {
		fmt.Fprintln(os.Stderr, "Invalid channel")
		flag.Usage()
		os.Exit(1)
	}
	if _, _, err := net.SplitHostPort(*serverArg); err != nil {
		fmt.Fprintln(os.Stderr, "Invalid server")
		flag.Usage()
		os.Exit(1)
	}
	if matched, _ := regexp.MatchString(`^[a-zA-Z0-9\[\]_-]{1,16}$`, *nickArg); !matched {
		fmt.Fprintln(os.Stderr, "Invalid nick")
		flag.Usage()
		os.Exit(1)
	}
	password := ""
	if len(*passwordArg) > 0 {
		f, err := os.Open(*passwordArg)
		if err != nil {
			fmt.Fprintf(os.Stderr, "Unable to open password file: %v\n", err)
			os.Exit(1)
		}
		password, err = bufio.NewReader(f).ReadString('\n')
		f.Close()
		if err != nil {
			fmt.Fprintf(os.Stderr, "Unable to read password file: %v\n", err)
			os.Exit(1)
		}
		if len(password) > 0 && password[len(password)-1] == '\n' {
			password = password[:len(password)-1]
		}
	}

	feeds := NewCgitFeedMonitorer(time.Second * 10)
	feeds.AddFeed("https://git.zx2c4.com/wireguard-linux/")
	feeds.AddFeed("https://git.zx2c4.com/wireguard-tools/")
	feeds.AddFeed("https://git.zx2c4.com/wireguard-linux-compat/")
	feeds.AddFeed("https://git.zx2c4.com/wireguard-windows/")
	feeds.AddFeed("https://git.zx2c4.com/wireguard-go/")
	feeds.AddFeed("https://git.zx2c4.com/wireguard-freebsd/")
	feeds.AddFeed("https://git.zx2c4.com/wireguard-openbsd/")
	feeds.AddFeed("https://git.zx2c4.com/wireguard-android/")
	feeds.AddFeed("https://git.zx2c4.com/android-wireguard-module-builder/")
	feeds.AddFeed("https://git.zx2c4.com/wireguard-apple/")
	feeds.AddFeed("https://git.zx2c4.com/wireguard-rs/")
	feeds.AddFeed("https://git.zx2c4.com/wintun/")
	feeds.AddFeed("https://git.zx2c4.com/wg-dynamic/")

	bot := hbot.NewBot(&hbot.Config{
		Host:     *serverArg,
		Nick:     *nickArg,
		Realname: "Your Friendly Neighborhood WurGur Bot",
		Channels: []string{*channelArg},
		Logger:   hbot.Logger{Verbosef: log.Printf, Errorf: log.Printf},
		Password: password,
	})

	urlShortener := regexp.MustCompile(`(.*\?id=[a-f0-9]{8})([a-f0-9]+)$`)
	go func() {
		for commit := range feeds.Updates() {
			<-bot.Joined()
			log.Printf("New commit %s in %s", commit.Commit.ID, commit.RepoTitle)
			url := commit.Commit.Link.Href
			if matches := urlShortener.FindStringSubmatch(url); len(matches) == 3 {
				url = matches[1]
			}
			bot.Msg(*channelArg, fmt.Sprintf("\x01ACTION found a new commit in \x0303%s\x0f - \x0306%s\x0f - %s\x01", commit.RepoTitle, commit.Commit.Title, url))
		}
	}()

	for {
		bot.Run()
		time.Sleep(time.Second * 5)
	}
}