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//! The module defines song structs and methods.
use crate::convert::FromIter;
use crate::error::{Error, ParseError};
use rustc_serialize::{Decodable, Decoder, Encodable, Encoder};
use std::collections::BTreeMap;
use std::fmt;
use std::str::FromStr;
use std::time::Duration;
use std::convert::TryFrom;
/// Song ID
#[derive(Debug, Copy, Clone, PartialEq, PartialOrd, Eq, Ord, Default)]
pub struct Id(pub u32);
impl Encodable for Id {
fn encode<S: Encoder>(&self, e: &mut S) -> Result<(), S::Error> {
self.0.encode(e)
}
}
impl Decodable for Id {
fn decode<S: Decoder>(d: &mut S) -> Result<Id, S::Error> {
d.read_u32().map(Id)
}
}
impl fmt::Display for Id {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
self.0.fmt(f)
}
}
/// Song place in the queue
#[derive(Debug, Copy, Clone, PartialEq, Default, RustcEncodable)]
pub struct QueuePlace {
/// song ID
pub id: Id,
/// absolute zero-based song position
pub pos: u32,
/// song priority, if present, defaults to 0
pub prio: u8,
}
/// Song range
#[derive(Debug, Copy, Clone, PartialEq)]
pub struct Range(pub Duration, pub Option<Duration>);
impl Encodable for Range {
fn encode<S: Encoder>(&self, e: &mut S) -> Result<(), S::Error> {
e.emit_tuple(2, |e| {
e.emit_tuple_arg(0, |e| e.emit_u64(self.0.as_secs()))?;
e.emit_tuple_arg(1, |e| {
e.emit_option(|e| match self.1 {
Some(d) => e.emit_option_some(|e| d.as_secs().encode(e)),
None => e.emit_option_none(),
})
})
})
}
}
impl Default for Range {
fn default() -> Range {
Range(Duration::from_secs(0), None)
}
}
impl fmt::Display for Range {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
self.0.as_secs().fmt(f)?;
f.write_str(":")?;
if let Some(v) = self.1 {
v.as_secs().fmt(f)?;
}
Ok(())
}
}
impl FromStr for Range {
type Err = ParseError;
fn from_str(s: &str) -> Result<Range, ParseError> {
let mut splits = s.split('-').flat_map(|v| v.parse().into_iter());
match (splits.next(), splits.next()) {
(Some(s), Some(e)) => Ok(Range(Duration::from_secs(s), Some(Duration::from_secs(e)))),
(None, Some(e)) => Ok(Range(Duration::from_secs(0), Some(Duration::from_secs(e)))),
(Some(s), None) => Ok(Range(Duration::from_secs(s), None)),
(None, None) => Ok(Range(Duration::from_secs(0), None)),
}
}
}
/// Song data
#[derive(Debug, Clone, PartialEq, Default)]
pub struct Song {
/// filename
pub file: String,
/// name (for streams)
pub name: Option<String>,
/// title
pub title: Option<String>,
/// last modification time
pub last_mod: Option<Duration>,
/// artist
pub artist: Option<String>,
/// duration (in seconds resolution)
pub duration: Option<Duration>,
/// place in the queue (if queued for playback)
pub place: Option<QueuePlace>,
/// range to play (if queued for playback and range was set)
pub range: Option<Range>,
/// arbitrary tags, like album, artist etc
pub tags: BTreeMap<String, String>,
}
impl Encodable for Song {
fn encode<S: Encoder>(&self, e: &mut S) -> Result<(), S::Error> {
e.emit_struct("Song", 8, |e| {
e.emit_struct_field("file", 0, |e| self.file.encode(e))?;
e.emit_struct_field("name", 1, |e| self.name.encode(e))?;
e.emit_struct_field("title", 2, |e| self.title.encode(e))?;
e.emit_struct_field("last_mod", 3, |e| {
e.emit_option(|e| match self.last_mod {
Some(m) => e.emit_option_some(|e| m.as_secs().encode(e)),
None => e.emit_option_none(),
})
})?;
e.emit_struct_field("artist", 4, |e| self.artist.encode(e))?;
e.emit_struct_field("duration", 5, |e| {
e.emit_option(|e| match self.duration {
Some(d) => e.emit_option_some(|e| d.as_secs().encode(e)),
None => e.emit_option_none(),
})
})?;
e.emit_struct_field("place", 6, |e| self.place.encode(e))?;
e.emit_struct_field("range", 7, |e| self.range.encode(e))?;
e.emit_struct_field("tags", 8, |e| self.tags.encode(e))?;
Ok(())
})
}
}
impl FromIter for Song {
/// build song from map
fn from_iter<I: Iterator<Item = Result<(String, String), Error>>>(iter: I) -> Result<Song, Error> {
let mut result = Song::default();
for res in iter {
let line = res?;
match &*line.0 {
"file" => result.file = line.1.to_owned(),
"Title" => result.title = Some(line.1.to_owned()),
"Last-Modified" => {
let parsed: time::Date = time::parse(&*line.1, "%Y-%m-%dT%H:%M:%SZ")
.map_err(ParseError::BadTime)?;
let stamp = std::time::Duration::try_from(parsed - time::date!(1970-01-01))?;
result.last_mod = Some(stamp);
},
"Artist" => result.artist = Some(line.1.to_owned()),
"Name" => result.name = Some(line.1.to_owned()),
"Time" => result.duration = Some(Duration::from_secs(line.1.parse()?)),
"Range" => result.range = Some(line.1.parse()?),
"Id" => {
match result.place {
None => {
result.place = Some(QueuePlace {
id: Id(line.1.parse()?),
pos: 0,
prio: 0,
})
}
Some(ref mut place) => place.id = Id(line.1.parse()?),
}
}
"Pos" => {
match result.place {
None => {
result.place = Some(QueuePlace {
pos: line.1.parse()?,
id: Id(0),
prio: 0,
})
}
Some(ref mut place) => place.pos = line.1.parse()?,
}
}
"Prio" => {
match result.place {
None => {
result.place = Some(QueuePlace {
prio: line.1.parse()?,
id: Id(0),
pos: 0,
})
}
Some(ref mut place) => place.prio = line.1.parse()?,
}
}
_ => {
result.tags.insert(line.0, line.1);
}
}
}
Ok(result)
}
}
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