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//! Dunamu Source Provider (v0.4 API)
//! <https://www.dunamu.com/>

use super::Price;
use crate::{
    config::HttpsConfig,
    https_client::{HttpsClient, Query},
    Currency, TradingPair,
};
use crate::{
    error::{Error, ErrorKind},
    prelude::*,
};

use rust_decimal::Decimal;
use serde::{Deserialize, Serialize};

//https://quotation-api-cdn.dunamu.com/v1/forex/recent?codes=FRX.KRWUSD

/// Base URI for requests to the Dunamu API
pub const API_HOST: &str = "quotation-api-cdn.dunamu.com";

/// Source provider for Dunamu
pub struct DunamuSource {
    https_client: HttpsClient,
}

impl DunamuSource {
    /// Create a new Dunamu source provider
    #[allow(clippy::new_without_default)]
    pub fn new(config: &HttpsConfig) -> Result<Self, Error> {
        let https_client = HttpsClient::new(API_HOST, config)?;
        Ok(Self { https_client })
    }

    /// Get trading pairs
    pub async fn trading_pairs(&self, pair: &TradingPair) -> Result<Price, Error> {
        if pair.0 != Currency::Krw && pair.1 != Currency::Krw {
            fail!(ErrorKind::Currency, "trading pair must be with KRW");
        }

        let mut query = Query::new();
        query.add("codes", format!("FRX.{}{}", pair.0, pair.1));

        let api_response: Response = self
            .https_client
            .get_json("/v1/forex/recent", &query)
            .await?;
        let price: Decimal = api_response[0].base_price.to_string().parse()?;
        Ok(Price::new(price)?)
    }
}

/// API responses Vector
pub type Response = Vec<ResponseElement>;
/// API response entity
#[derive(Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct ResponseElement {
    code: String,
    currency_code: String,
    currency_name: String,
    country: String,
    name: String,
    date: String,
    time: String,
    recurrence_count: i64,
    base_price: f64,
    opening_price: f64,
    high_price: f64,
    low_price: f64,
    change: String,
    change_price: f64,
    cash_buying_price: f64,
    cash_selling_price: f64,
    tt_buying_price: f64,
    tt_selling_price: f64,
    tc_buying_price: Option<serde_json::Value>,
    fc_selling_price: Option<serde_json::Value>,
    exchange_commission: f64,
    us_dollar_rate: f64,
    #[serde(rename = "high52wPrice")]
    high52_w_price: f64,
    #[serde(rename = "high52wDate")]
    high52_w_date: String,
    #[serde(rename = "low52wPrice")]
    low52_w_price: f64,
    #[serde(rename = "low52wDate")]
    low52_w_date: String,
    currency_unit: i64,
    provider: String,
    timestamp: i64,
    id: i64,
    created_at: String,
    modified_at: String,
    change_rate: f64,
    signed_change_price: f64,
    signed_change_rate: f64,
}

#[cfg(test)]
mod tests {
    use super::DunamuSource;
    use std::future::Future;

    fn block_on<F: Future>(future: F) -> F::Output {
        tokio::runtime::Builder::new()
            .basic_scheduler()
            .enable_all()
            .build()
            .unwrap()
            .block_on(future)
    }

    /// `trading_pairs()` test with known currency pair
    #[test]
    #[ignore]
    fn trading_pairs_ok() {
        let pair = "KRW/USD".parse().unwrap();
        let _response = block_on(
            DunamuSource::new(&Default::default())
                .unwrap()
                .trading_pairs(&pair),
        )
        .unwrap();
    }

    /// `trading_pairs()` with invalid currency pair
    #[test]
    #[ignore]
    fn trading_pairs_404() {
        let pair = "N/A".parse().unwrap();

        // TODO(tarcieri): test 404 handling
        let _err = block_on(
            DunamuSource::new(&Default::default())
                .unwrap()
                .trading_pairs(&pair),
        )
        .err()
        .unwrap();
    }
}