extern crate serde;
#[macro_use]
extern crate serde_derive;
extern crate serde_json;
extern crate urlencoding;

#[derive(Serialize, Deserialize)]
pub struct OTP {
    secret: String,
    label: String,
    digits: i64,
    #[serde(rename = "type")]
    otp_type: String,
    algorithm: String,
    thumbnail: String,
    last_used: i64,
    period: i64,
    tags: Vec<String>,
}

fn main() {
    let otp_array_json = match std::env::args().nth(1) {
        Some(otp_array) => otp_array,
        None => {
            eprintln!("Could not get json containing OTPs.");
            return;
        }
    };
    let otp_array: Vec<OTP> = match serde_json::from_str(&otp_array_json) {
        Ok(otp_array) => otp_array,
        Err(err) => {
            eprintln!("Could not deserialize OTPs: {}", err);
            return;
        }
    };
    for otp in otp_array {
        println!(
            "otpauth://{}/{}?secret={}&algorithm={}&digits={}&period={}",
            otp.otp_type.to_ascii_lowercase(),
            urlencoding::encode(&otp.label),
            otp.secret,
            otp.algorithm,
            otp.digits,
            otp.period
        );
    }
}