//! SMTP server implementation for receiving and processing emails.
//!
//! This module handles SMTP connections, email parsing, and forwarding to
//! Telegram.

use crate::{
	Cursor,
	telegram::TelegramTransport,
	utils::{
		Attachment,
		RE_DOMAIN,
		validate,

	relay: bool,
	tg: Arc<TelegramTransport>,
	fields: HashSet<String>,
	address: Regex,
}

impl MailServer {
	/// Main asynchronous entry point for the application.
	///
	/// Parses command-line arguments, loads configuration, and starts the SMTP
	/// server.
	///
	/// # Errors
	/// Returns an error if configuration is invalid, files are inaccessible, or
	/// server fails to start.
	pub fn new(settings: config::Config) -> Result<MailServer> {
		let api_key = settings.get_string("api_key")
			.context("[smtp2tg.toml] missing \"api_key\" parameter.\n")?;
		let mut recipients = HashMap::new();
		for (name, value) in settings.get_table("recipients")
			.expect("[smtp2tg.toml] missing table \"recipients\".\n")
		{

			relay,
			tg,
			fields,
			address,
		})
	}

	/// Retrieves the Telegram chat ID for a given email address, checks that
	/// used domain is allowed.
	///
	/// # Arguments
	/// * `name_str` - Email address or username to look up.
	///
	/// # Returns
	/// * `Result<ChatPeerId>` - Telegram chat ID for the address, or default if
	///   not found.
	pub fn get_id (&self, name: &str) -> Result<&ChatPeerId> {
		if self.address.is_match(name) {
			match self.tg.get(name) {
				Ok(addr) => Ok(addr),
				Err(_) => Ok(&self.tg.default),
			}
		} else {

		} else {
			bail!("Required headers were not found.");
		}
		Ok(())
	}
}

/// SMTP handler implementation for mailin-embedded.
impl mailin_embedded::Handler for MailServer {
	/// Just deny login auth
	fn auth_login (&mut self, _username: &str, _password: &str) -> Response {
		INVALID_CREDENTIALS
	}

	/// Just deny plain auth