use serenity;
use serenity::voice::ffmpeg;

use std::sync::Arc;

use super::super::prelude::*;

pub struct Skip {
    media: Arc<MediaData>,
}

impl Skip {
    pub fn new(media_data: Arc<MediaData>) -> Skip {
        Skip { media: media_data }
    }
}

impl serenity::framework::standard::Command for Skip {
    #[allow(unreachable_code, unused_mut)]
    fn execute(
        &self,
        ctx: &mut serenity::client::Context,
        msg: &serenity::model::channel::Message,
        _: serenity::framework::standard::Args,
    ) -> ::std::result::Result<(), serenity::framework::standard::CommandError> {
        if !channel_contains_author(ctx, msg) {
            println!(
                "user {} is not in the same voice channel as the bot",
                msg.author.name
            );
            return Ok(());
        }

        let mut manager_lock = ctx.data.lock().get::<VoiceManager>().cloned().unwrap();

        let mut manager = manager_lock.lock();

        let guild_id = match guild_id(msg.channel_id) {
            Some(id) => id,
            None => {
                println!("error getting guild id");
                print_error!(msg.channel_id.say("error getting guild id"));

                return Ok(());
            }
        };

        if let Some(handler) = handler(guild_id, &mut manager) {
            let playlist_mutex = self.media.playlist_mut();
            let mut playlist = playlist_mutex.borrow_mut();

            let song_mutex = self.media.song_mut();
            let mut song = song_mutex.borrow_mut();

            if playlist.is_empty() {
                print_error!(
                    msg.channel_id
                        .say("playlist is empty, no next song available")
                );

                return Ok(());
            } else {
                let first = playlist.remove(0);

                handler.stop();

                let source = match ffmpeg(first.name.clone()) {
                    Ok(mpeg) => mpeg,
                    Err(_) => {
                        playlist.clear();
                        *song = None;

                        return Ok(());
                    }
                };

                *song = Some(handler.play_returning(source));
                let song_name = self.media.name_mut();
                *song_name.borrow_mut() = first.name.clone();

                print_error!(
                    msg.channel_id
                        .say(format!("Skipped current song, now playing: {}", first.name))
                );
            }
        }

        Ok(())
    }
}