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extern crate rustc_serialize;

use std::fmt;
use rustc_serialize::{Encodable, Decodable};

#[derive(Debug, Clone, RustcDecodable, RustcEncodable)]
pub struct AccessTokenDTO {
    pub app_id: String,
    pub scopes: String,
    pub access_token: String,
    pub token_type: TokenTypeDTO,
    pub expiration: i64,
}

impl DTO for AccessTokenDTO { }

#[derive(Debug, PartialEq, Eq, Copy, Clone, RustcDecodable, RustcEncodable)]
pub enum TokenTypeDTO {
    Bearer,
}

impl fmt::Display for TokenTypeDTO {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{:?}", self)
    }
}

impl DTO for TokenTypeDTO { }

pub trait DTO : Encodable + Decodable { }

pub trait FromDTO<D: DTO> : Sized {
    fn from_dto(dto: D) -> Result<Self, FromDTOError>;
}

pub struct FromDTOError;