use std;

pub struct Modem {
    is_connected: bool,
}

#[derive(Debug, Clone)]
pub struct ModemConnectionError;

impl std::fmt::Display for ModemConnectionError {
    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
        write!(f, "gprs connection error")
    }
}

type ModemConnection = Result<Modem, ModemConnectionError>;

impl Modem {
    pub fn new() -> Self {
        Self {
            is_connected: false,
        }
    }
    pub fn connect_to_gprs_ap(mut self, apn: &str, username: &str, password: &str)-> ModemConnection {
        // TODO: set AT command for connecting to gprs
        self.is_connected = true;
        Ok(self)
    }
}