use chrono::{Utc, DateTime};
use super::Period;
use super::options::OptionKind;

pub enum AssetIdentifier{
    Ticker(String),
    Cusip(String),
    Other(String)
}


///Information about what this quote it, where it came from and when
/// 
pub trait QuoteData {
    /// Gives the symbol/ticker/cusip of this asset
    fn asset_symbol(&self) -> AssetIdentifier;
    /// Gives the timestamp of when the quote data is valid
    fn quote_time(&self) -> DateTime<Utc>;
    /// Gives the timestamp of when the quote was created
    fn retrieve_time(&self) ->DateTime<Utc>;
    /// Gives the exchange which the data was sources from
    fn exchange(&self)  -> Option<String>;
    // TO DO:  Gives the datasource used 
}
///Standard volume information
/// 
pub trait VolumeData {
    /// Gives the period over which this volume is valid
    fn volume_period(&self) -> Period;
    /// Total volume seem in that period
    fn total_volume(&self)  -> u64;
    /// Gives the current bid size of the asset
    fn bid_size(&self)      -> u64;
    // Gives the current as size of the asset
    fn ask_size(&self)      -> u64;
    // Gives the size of the last trade
    fn last_size(&self)     -> Option<u64>;
}
///Standard information about price spread
/// 
pub trait PriceSpreadData {
    /// Give the bid price of an asset 
    fn bid(&self)    -> f64;
    /// Gives the mid price of an asset
    fn mid(&self)    -> f64;
    /// Gives the ask price of an asset
    fn ask(&self)    -> f64;
}
pub trait Marginable {
    /// Gives the margin cost as a yearly interest cost. Returns none if not marginable
    fn margin_cost(&self) -> Option<f64>;
    /// Returns true if we can use margin on this instrument
    fn is_marginable(&self) -> bool;
}


pub trait CryptoData {
    fn base_crypto(&self) -> String;
    fn quote_crypto(&self) -> String;
}