use serenity;
use serenity::model::id::ChannelId;
use serenity::voice::ffmpeg;
use serenity::voice::LockedAudio;

use std::cell::RefCell;
use std::ops::DerefMut;
use std::rc::Rc;
use std::sync::{Arc, Mutex, MutexGuard};

use super::prelude::*;

pub struct Song {
    pub name: String,
}

pub struct MediaData {
    playlist: Mutex<RefCell<Vec<Song>>>,
    current_song: Mutex<RefCell<Option<LockedAudio>>>,
    song_name: Mutex<RefCell<String>>,
    pub next_callback: RefCell<Option<Rc<Fn() -> ()>>>,
}

impl MediaData {
    pub fn reset(
        &self,
        ctx: &mut serenity::client::Context,
        msg: &serenity::model::channel::Message,
    ) -> Result<(), String> {
        {
            let playlist = self.playlist_mut();
            playlist.borrow_mut().clear();
        }

        {
            let song = self.song_mut();
            *song.borrow_mut() = None;
        }

        {
            let name = self.name_mut();
            *name.borrow_mut() = String::new();
        }

        {
            *self.next_callback.borrow_mut() = None;
        }

        {
            let 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(guild_id) => guild_id,
                None => return Ok(()),
            };

            {
                let handler = match handler(guild_id, &mut manager) {
                    Some(handler) => handler,
                    None => return Ok(()),
                };

                println!("stopped handler");

                handler.stop();
            }

            manager.remove(guild_id);
        }

        Ok(())
    }

    pub fn song_mut(&self) -> MutexGuard<RefCell<Option<LockedAudio>>> {
        self.current_song.lock().unwrap()
    }

    pub fn playlist_mut(&self) -> MutexGuard<RefCell<Vec<Song>>> {
        self.playlist.lock().unwrap()
    }

    pub fn name_mut(&self) -> MutexGuard<RefCell<String>> {
        self.song_name.lock().unwrap()
    }

    pub fn start_playing(
        mediadata: &Arc<MediaData>,
        callback: Rc<Fn() -> ()>,
        channel_id: ChannelId,
        manager_lock: &Arc<
            serenity::prelude::Mutex<serenity::client::bridge::voice::ClientVoiceManager>,
        >,
    ) {
        // check if there is already playing
        let already_started = {
            let song_lock = mediadata.song_mut();
            let song = song_lock.borrow();
            song.is_some()
        };

        // if there isnt already a song playing, start a new one
        if !already_started {
            *mediadata.next_callback.borrow_mut() = Some(callback.clone());

            Self::next_song(mediadata, channel_id, manager_lock, callback);
        }
    }

    pub fn next_song(
        mediadata: &Arc<MediaData>,
        channel_id: ChannelId,
        manager_lock: &Arc<
            serenity::prelude::Mutex<serenity::client::bridge::voice::ClientVoiceManager>,
        >,
        callback: Rc<Fn() -> ()>,
    ) {
        let mut manager = manager_lock.lock();

        let guild_id = match guild_id(channel_id) {
            Some(id) => id,
            None => {
                println!("error getting guild_id");
                return;
            }
        };

        let mut need_to_leave = false;

        {
            let handler = {
                match handler(guild_id, &mut manager) {
                    Some(handler) => handler,
                    None => {
                        println!("error getting handler");
                        return;
                    }
                }
            };

            let playlist_lock = mediadata.playlist_mut();
            let mut playlist = playlist_lock.borrow_mut();

            let song_name_lock = mediadata.name_mut();
            let mut name = song_name_lock.borrow_mut();

            let song_lock = mediadata.song_mut();
            let mut song = song_lock.borrow_mut();

            if playlist.is_empty() {
                need_to_leave = true;
                handler.stop();
                *song = None;
                *name = String::new();
                *mediadata.next_callback.borrow_mut() = None;
            } else {
                handler.stop();

                let first = playlist.remove(0);

                let source = match ffmpeg(first.name.clone()) {
                    Ok(mpeg) => mpeg,
                    Err(_) => {
                        playlist.clear();

                        return;
                    }
                };

                *song = Some(handler.play_returning_and_callback(source, callback));
                *name = first.name.clone();

                print_error!(channel_id.say(format!("Playing song: {}", first.name)));
            }
        }

        if need_to_leave {
            manager.remove(guild_id);
        }
    }
}

impl Default for MediaData {
    fn default() -> MediaData {
        MediaData {
            playlist: Mutex::new(RefCell::new(Vec::new())),
            current_song: Mutex::new(RefCell::new(None)),
            song_name: Mutex::new(RefCell::new(String::new())),
            next_callback: RefCell::new(None),
        }
    }
}

unsafe impl Send for MediaData {}
unsafe impl Sync for MediaData {}