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//! binance exchange info

use std::convert::TryFrom;
use std::time::Duration;

use cxmr_api_clients_errors::Error;
use cxmr_exchanges::{RateLimit, RateLimitType};

#[derive(Deserialize)]
pub struct BncRateLimit {
    #[serde(rename = "rateLimitType")]
    limit_type: String,
    #[serde(rename = "interval")]
    interval: String,
    #[serde(rename = "intervalNum")]
    interval_num: u64,
    #[serde(rename = "limit")]
    limit: u64,
}

impl TryFrom<BncRateLimit> for RateLimit {
    type Error = Error;
    #[inline]
    fn try_from(filter: BncRateLimit) -> Result<RateLimit, Error> {
        Ok(RateLimit {
            kind: match_rate_limit_type(&filter.limit_type)?,
            limit: filter.limit,
            interval: interval_duration(&filter.interval, filter.interval_num)?,
        })
    }
}

#[inline]
fn match_rate_limit_type(s: &str) -> Result<RateLimitType, Error> {
    match s {
        "ORDERS" => Ok(RateLimitType::Order),
        "RAW_REQUESTS" => Ok(RateLimitType::Request),
        "REQUEST_WEIGHT" => Ok(RateLimitType::RequestWeight),
        _ => Err(Error::UnexpectedRateLimitType(s.to_string())),
    }
}

#[inline]
fn interval_duration(s: &str, num: u64) -> Option<Duration> {
    match s {
        "SECOND" => Some(Duration::from_secs(num)),
        "MINUTE" => Some(Duration::from_secs(num * 60)),
        "HOUR" => Some(Duration::from_secs(num * 60 * 60)),
        "DAY" => Some(Duration::from_secs(num * 60 * 60 * 24)),
        _ => None,
    }
}