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use super::dirs::dir_config_create;

extern crate config;
use self::config::reader::{from_file, from_stream};
use self::config::types::{Config, SettingsList};

use std::error::Error;
use std::fs::metadata;
use std::io::stdin;
use std::path::Path;

fn wrap_from_file(path: &Path) -> Result<Config, Box<Error>> {
    Ok(try!(if path.to_str() == Some("-") {
        from_stream(&mut stdin())
    } else {
        from_file(path)
    }))
}

/// Loads a configuration file for the application.
pub fn load_config(app: &str, file: &str) -> Result<Config, Box<Error>> {
    let mut path_buf = try!(dir_config_create(app));
    path_buf.push(file);

    load_config_path(path_buf.as_path())
}

/// Loads a configuration file from the given path.
///
/// The path `-` is interpreted to mean standard input.
pub fn load_config_path(path: &Path) -> Result<Config, Box<Error>> {
    if metadata(path).ok().map_or(false, |m| m.is_file()) {
        let config = try!(wrap_from_file(path));
        Ok(config)
    } else {
        Ok(Config::new(SettingsList::new()))
    }
}