use crate::crypto::*;
use crate::errors::*;

use std::fs::File;
use std::io::prelude::*;
use std::net::{IpAddr, SocketAddr};
use std::path::{Path, PathBuf};

#[derive(Serialize, Deserialize, Debug)]
pub struct DNSCryptConfig {
    pub provider_name: String,
}

#[derive(Serialize, Deserialize, Debug)]
pub struct TLSConfig {
    pub upstream_addr: Option<SocketAddr>,
}

#[derive(Serialize, Deserialize, Debug)]
pub struct Config {
    pub listen_addrs: Vec<SocketAddr>,
    pub external_addr: IpAddr,
    pub upstream_addr: SocketAddr,
    pub state_file: PathBuf,
    pub udp_timeout: u32,
    pub tcp_timeout: u32,
    pub udp_max_active_connections: u32,
    pub tcp_max_active_connections: u32,
    pub user: Option<String>,
    pub group: Option<String>,
    pub chroot: Option<String>,
    pub dnscrypt: DNSCryptConfig,
    pub tls: TLSConfig,
}

impl Config {
    pub fn from_string(toml: &str) -> Result<Config, Error> {
        let config: Config = match toml::from_str(toml) {
            Ok(config) => config,
            Err(e) => bail!(format_err!("Parse error in the configuration file: {}", e)),
        };
        Ok(config)
    }

    pub fn from_path<P: AsRef<Path>>(path: P) -> Result<Config, Error> {
        let mut fd = File::open(path)?;
        let mut toml = String::new();
        fd.read_to_string(&mut toml)?;
        Config::from_string(&toml)
    }
}

#[derive(Serialize, Deserialize, Debug)]
pub struct State {
    pub provider_kp: SignKeyPair,
}

impl State {
    pub fn new() -> Self {
        let provider_kp = SignKeyPair::new();
        State { provider_kp }
    }
}