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//! Daemon configuration structures and parsing.
#![feature(try_trait)]

#[macro_use]
extern crate failure;
#[macro_use]
extern crate serde_derive;
extern crate hashbrown;
extern crate serde;
extern crate toml;

#[macro_use]
extern crate err_convert_macro;
extern crate cxmr_api;
extern crate cxmr_exchanges;
#[cfg(feature = "chat")]
extern crate cxmr_telegram;

mod parse;

#[cfg(feature = "chat")]
mod telegram;

#[cfg(feature = "chat")]
pub use self::telegram::*;

use std::fs::read_to_string;
use std::net::SocketAddr;
use std::path::Path;
use std::str::FromStr;

use hashbrown::HashMap;

use cxmr_api::Account;
use cxmr_exchanges::Exchange;

use self::parse::ParsedConfig;

/// Crypto market daemon config error type.
#[derive(Debug, Fail)]
pub enum Error {
    /// Standard IO error.
    #[fail(display = "std io error: {:?}", _0)]
    Io(#[cause] std::io::Error),

    /// TOML Deserialization error.
    #[fail(display = "toml de error: {:?}", _0)]
    TomlDe(#[cause] ::toml::de::Error),
}

err_converter!(Io, std::io::Error);
err_converter!(TomlDe, ::toml::de::Error);

/// Crypto-bank configuration.
#[derive(Clone)]
pub struct Config {
    pub exchanges: Vec<Exchange>,
    pub accounts_map: HashMap<String, Account>,
    pub events_logging: bool,
    pub server: ServerConfig,
    pub tectonic: TectonicConfig,
    #[cfg(feature = "chat")]
    pub telegram: Option<TelegramConfig>,
    #[cfg(feature = "pubsub")]
    pub zmq: Option<pubsub::ZmqConfig>,
}

impl Config {
    /// Opens configuration file.
    pub fn open<P: AsRef<Path>>(path: P) -> Result<Self, Error> {
        Ok(read_to_string(path)?.parse()?)
    }

    /// Returns config account.
    pub fn accounts(&self) -> Vec<Account> {
        self.accounts_map
            .iter()
            .map(|(_, account)| account.clone())
            .collect()
    }
}

impl FromStr for Config {
    type Err = toml::de::Error;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        Ok(::toml::from_str::<ParsedConfig>(s)?.into())
    }
}

#[cfg(feature = "pubsub")]
pub mod pubsub {
    /// ZMQ configuration.
    #[derive(Clone, Deserialize, Serialize)]
    pub struct ZmqConfig {
        pub enable: bool,
        pub address: String,
    }
}

/// Tectonic configuration.
#[derive(Clone, Deserialize, Serialize)]
pub struct TectonicConfig {
    pub send: bool,
    pub addr: SocketAddr,
    pub threads: usize,
}

/// Server configuration.
#[derive(Clone, Deserialize, Serialize)]
pub struct ServerConfig {
    pub listen: SocketAddr,
}

#[cfg(test)]
mod test {
    use std::net::SocketAddr;
    use std::str::FromStr;
    #[cfg(feature = "chat")]
    use std::time::Duration;

    use super::*;

    #[test]
    fn from_str() {
        let cfg = Config::from_str(include_str!("../../../../config.example.toml")).unwrap();
        let tectonic = cfg.tectonic;
        assert_eq!(tectonic.send, false);
        assert_eq!(
            tectonic.addr,
            SocketAddr::from_str("127.0.0.1:9001").unwrap()
        );
        assert_eq!(tectonic.threads, 4);

        #[cfg(feature = "chat")]
        {
            let telegram = cfg.telegram.unwrap();
            assert_eq!(telegram.balances.start(), Duration::from_secs(60));
            assert_eq!(telegram.balances.interval(), Duration::from_secs(60 * 60));
        }
    }
}