use serde::{
    Deserialize,
    Serialize,
};
use std::{
    net::IpAddr,
    path::PathBuf,
};
use tokio::{
    fs::File,
    io::AsyncReadExt,
};
use crate::cli::Options;

#[derive(Debug, Serialize, Deserialize)]
#[serde(default, rename_all = "kebab-case")]
pub struct Config {
    pub database_path: PathBuf,
    pub ip_address: IpAddr,
    pub port: u16,
}

impl Config {
    pub async fn get(options: &Options) -> std::io::Result<Self> {
        if options.no_config {
            Ok(Config::default())
        } else {
            let mut config_file = File::open(&options.config).await?;
            let mut config_string = String::new();
            config_file.read_to_string(&mut config_string).await?;
    
            toml::from_str(&config_string)
                .map_err(|err| std::io::Error::new(
                    std::io::ErrorKind::InvalidData,
                    err
                )
            )
        }
    }
}

impl Default for Config {
    fn default() -> Self {
        Config {
            database_path: crate::DEFAULT_DATABASE_PATH.into(),
            ip_address: crate::DEFAULT_IP_ADDRESS,
            port: crate::DEFAULT_PORT,
        }
    }
}