using Telegram.Bot;
using Telegram.Bot.Types.Enums;

var    homeDir    = Environment.GetFolderPath(Environment.SpecialFolder.UserProfile);
var    configFile = Path.Join(homeDir, ".telegram-send.conf");
string config;

if (args.Length == 0)
	PrintSyntaxAndExit();

if (args[0] == "--config") {
	if (args.Length != 3)
		PrintSyntaxAndExit();

	config = $"""
	token={args[1]}
	chatId={args[2]}
	""";

	File.WriteAllText(configFile, config);
	Environment.Exit(0);
}

if (args.Length > 3)
	PrintSyntaxAndExit();

config = File.ReadAllText(configFile);
var token   = config.Split("\n")[0].Replace("token=", "");
var chatId  = config.Split("\n")[1].Replace("chatId=", "");
if (args[0] == "-" && args.Contains("--linefeed")) {
	var bot = new TelegramBotClient(token);
	while (Console.In.ReadLine() is { } line) {
		var message = line.Trim();
		if (message.Length > 0) {
			if (args.Contains("--pre"))
				message = $"```\n{message}\n```";

			await bot.SendTextMessageAsync(chatId, EscapeText(message), ParseMode.MarkdownV2);
		}
	}
}
else {
	var message = args[0] == "-" ? Console.In.ReadToEnd() : args[0];
	var bot     = new TelegramBotClient(token);

	if (args.Contains("--pre"))
		message = $"```\n{message}\n```";

	await bot.SendTextMessageAsync(chatId, EscapeText(message), ParseMode.MarkdownV2);
}

void PrintSyntaxAndExit() {
	Console.WriteLine("""
	Syntax:
	telegram-send --config <token> <chatid>
	telegram-send <message> [--pre]

	To read from stdin, pass '-' as message.
	""");
	Environment.Exit(1);
}

string EscapeText(string message) {
	return message
		.Replace(".", "\\.")
		.Replace("=", "\\=");
}