lyrical 0.1.6

Tool to show the lyrics of the current song.
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use anyhow::Result;
use futures::future::OptionFuture;
use std::{process::Command, thread, time::Duration};

use crate::{lyrics::Language, song::{Song, SongData}};

mod lyrics;
mod song;

const UPDATE_PERIOD: f64 = 0.1f64;

fn info_log(message: impl ToString) {
    println!("[INFO] {}", message.to_string());
}

fn command(command: &str) -> String {
    let mut parts = command.split_whitespace().collect::<Vec<&str>>();

    let stdout = Command::new(parts.remove(0))
        .args(parts)
        .output()
        .unwrap_or_else(|error| panic!("Failed to execute command '{}' with error '{}'", command, error))
        .stdout;

    String::from_utf8(stdout).expect("Stdout was not valid UTF-8")
}

fn get_position() -> f64 {
    command("playerctl -p spotify position")
        .trim()
        .parse()
        .unwrap_or(0.)
        // .expect("Command returned with non-float answer")
}

fn to_pinyin(line: &str) -> String {
    let mut translated = String::new();
    let mut last_pinyin = false;
    for character in line.chars() {
        let res = match mandarin_to_pinyin::lookup_chars(&[character]) {
            Ok(pinyin) => match pinyin.vec[0] {
                Some(ref result) => result[0].clone(),
                None => character.to_string()
            },
            Err(_) => character.to_string(),
        };

        if last_pinyin { translated += " " };
        translated += &res;
        last_pinyin = res.len() != 1;
    }

    translated.trim().to_string()
}

#[tokio::main]
async fn main() -> Result<()> {
    // Initialize chinese to pinyin map
    mandarin_to_pinyin::init_map(None).expect("Cant be bothered catching this one");

    // let mut metadata: Option<Metadata> = None;
    let mut song: Option<Song> = None;
    let mut previous_line = "".to_string();
    loop {
        thread::sleep(Duration::from_secs_f64(UPDATE_PERIOD));

        let data = SongData::get_data();
        if match (&data, &song) {
            // True if metadata and lyrics exist and are different
            // e.g. changing songs
            (Some(data), Some(song)) => data != &song.data,
            // True if lyrics exist but metadata doesn't
            // e.g. no more songs
            (None, Some(_)) => true,
            // True if metadata exists but lyrics don't
            // e.g. just started playing
            (Some(_), None) => true,
            // Else false
            // e.g. still playing same song
            _ => false,
        } {
            // Requests the song if exists, or None if no data.
            song = OptionFuture::from(
                data.map(|data| Song::request_song(data)),
            ).await;
        }

        let Some(song) = &song else { continue; };
        let Some(lyrics) = &song.lyrics else { continue; };

        let line = lyrics.get_line_at_time(get_position());
        if line == previous_line { continue }
        previous_line = line.to_string();

        let line = match lyrics.language {
            Language::Japanese => kakasi::convert(line).romaji,
            Language::Korean => korean_romanize::convert(line),
            Language::Chinese => to_pinyin(line),
            Language::Other => line.to_string(),
        };

        println!("{}", line);
    }
}