//! The module defines playlist data structures

use crate::convert::FromMap;
use crate::error::{Error, ProtoError, ParseError};

use std::collections::BTreeMap;
use std::convert::TryFrom;
use std::time::Duration;

/// Playlist
#[derive(Clone, Debug, PartialEq)]
pub struct Playlist {
    /// name
    pub name: String,
    /// last modified
    pub last_mod: Duration,
}

impl FromMap for Playlist {
    fn from_map(map: BTreeMap<String, String>) -> Result<Playlist, Error> {
        Ok(Playlist {
               name: map.get("playlist").map(|v| v.to_owned()).ok_or(Error::Proto(ProtoError::NoField("playlist")))?,
               last_mod: map.get("Last-Modified")
                .ok_or(Error::Proto(ProtoError::NoField("Last-Modified")))
                .and_then(|v| {
                    let parsed: time::Date = time::parse(&*v, "%Y-%m-%dT%H:%M:%SZ")
                        .map_err(ParseError::BadTime)?;
                    Ok(std::time::Duration::try_from(parsed - time::date!(1970-01-01))
                        .map_err(ParseError::BadTimeConversion)?)
                })?
           })
    }
}