use crate::config::Config;
use anyhow::{anyhow, Result, Context};
use mpris::{Player, PlayerFinder, PlaybackStatus};
use std::thread;
use std::time::Duration;

const INTERVAL: Duration = Duration::from_millis(1000);

const MPRIS_BUS_PREFIX: &str = "org.mpris.MediaPlayer2.";

pub fn is_active(player: &Player) -> bool {
    if !player.is_running() { return false; }

    matches!(player.get_playback_status(), Ok(PlaybackStatus::Playing))
}

pub fn is_whitelisted(config: &Config, player: &Player) -> bool {
    if Some(player.bus_name()) == config.global.player_bus.as_deref() {
        return true
    } else if config.global.player_bus.is_none() {
        return player.bus_name().starts_with(MPRIS_BUS_PREFIX)
    } else {
        return false
    }
}

pub fn wait_for_player(config: &Config) -> Result<Player> {
    let finder = PlayerFinder::new()
        .map_err(|err| anyhow!("{}", err))
        .context("failed to connect to d-bus")?;

    loop {
        let players = match finder.iter_players() {
            Ok(players) => players,
            _ => {
                thread::sleep(INTERVAL);
                continue;
            }
        };

        for player in players {
            if let Ok(player) = player {
                if is_active(&player) && is_whitelisted(config, &player) {
                    return Ok(player);
                }
            }
        }

        thread::sleep(INTERVAL);
    }
}