use std::env;
use serde::Deserialize;
use tsclientlib::{ClientId, Connection, DisconnectOptions, Identity, StreamItem};
use tsproto_packets::packets::{AudioData, CodecType, OutAudio, OutPacket};
use audiopus::coder::Encoder;
use futures::prelude::*;
use sdl2::audio::{AudioCallback, AudioDevice, AudioSpec, AudioSpecDesired, AudioStatus};
use sdl2::AudioSubsystem;

// This trait adds the `register_songbird` and `register_songbird_with` methods
// to the client builder below, making it easy to install this voice client.
// The voice client can be retrieved in any command using `songbird::get(ctx).await`.
use songbird::SerenityInit;

// Import the `Context` to handle commands.
use serenity::client::Context;

use serenity::{
    async_trait,
    client::{Client, EventHandler},
    framework::{
        StandardFramework,
        standard::{
            Args, CommandResult,
            macros::{command, group},
        },
    },
    model::{channel::Message, gateway::Ready},
    Result as SerenityResult,
};

pub(crate) struct Handler;

#[async_trait]
impl EventHandler for Handler {
    async fn ready(&self, _: Context, ready: Ready) {
        println!("{} is connected!", ready.user.name);
    }
}

#[group]
#[commands(deafen, join, leave, mute, play, ping, undeafen, unmute)]
pub struct General;

#[derive(Debug,Deserialize)]
struct Config {
    discord_token: String,
    teamspeak_server: String,
    teamspeak_identity: String,
    teamspeak_channel: i32,
}

#[command]
#[only_in(guilds)]
async fn deafen(ctx: &Context, msg: &Message) -> CommandResult {
    let guild = msg.guild(&ctx.cache).await.unwrap();
    let guild_id = guild.id;

    let manager = songbird::get(ctx).await
        .expect("Songbird Voice client placed in at initialisation.").clone();

    let handler_lock = match manager.get(guild_id) {
        Some(handler) => handler,
        None => {
            check_msg(msg.reply(ctx, "Not in a voice channel").await);

            return Ok(());
        },
    };

    let mut handler = handler_lock.lock().await;

    if handler.is_deaf() {
        check_msg(msg.channel_id.say(&ctx.http, "Already deafened").await);
    } else {
        if let Err(e) = handler.deafen(true).await {
            check_msg(msg.channel_id.say(&ctx.http, format!("Failed: {:?}", e)).await);
        }

        check_msg(msg.channel_id.say(&ctx.http, "Deafened").await);
    }

    Ok(())
}

#[command]
#[only_in(guilds)]
async fn join(ctx: &Context, msg: &Message) -> CommandResult {
    let guild = msg.guild(&ctx.cache).await.unwrap();
    let guild_id = guild.id;

    let channel_id = guild
        .voice_states.get(&msg.author.id)
        .and_then(|voice_state| voice_state.channel_id);

    let connect_to = match channel_id {
        Some(channel) => channel,
        None => {
            check_msg(msg.reply(ctx, "Not in a voice channel").await);

            return Ok(());
        }
    };

    let manager = songbird::get(ctx).await
        .expect("Songbird Voice client placed in at initialisation.").clone();

    let _handler = manager.join(guild_id, connect_to).await;

    Ok(())
}

#[command]
#[only_in(guilds)]
async fn leave(ctx: &Context, msg: &Message) -> CommandResult {
    let guild = msg.guild(&ctx.cache).await.unwrap();
    let guild_id = guild.id;

    let manager = songbird::get(ctx).await
        .expect("Songbird Voice client placed in at initialisation.").clone();
    let has_handler = manager.get(guild_id).is_some();

    if has_handler {
        if let Err(e) = manager.remove(guild_id).await {
            check_msg(msg.channel_id.say(&ctx.http, format!("Failed: {:?}", e)).await);
        }

        check_msg(msg.channel_id.say(&ctx.http, "Left voice channel").await);
    } else {
        check_msg(msg.reply(ctx, "Not in a voice channel").await);
    }

    Ok(())
}

#[command]
#[only_in(guilds)]
async fn mute(ctx: &Context, msg: &Message) -> CommandResult {
    let guild = msg.guild(&ctx.cache).await.unwrap();
    let guild_id = guild.id;

    let manager = songbird::get(ctx).await
        .expect("Songbird Voice client placed in at initialisation.").clone();

    let handler_lock = match manager.get(guild_id) {
        Some(handler) => handler,
        None => {
            check_msg(msg.reply(ctx, "Not in a voice channel").await);

            return Ok(());
        },
    };

    let mut handler = handler_lock.lock().await;

    if handler.is_mute() {
        check_msg(msg.channel_id.say(&ctx.http, "Already muted").await);
    } else {
        if let Err(e) = handler.mute(true).await {
            check_msg(msg.channel_id.say(&ctx.http, format!("Failed: {:?}", e)).await);
        }

        check_msg(msg.channel_id.say(&ctx.http, "Now muted").await);
    }

    Ok(())
}

#[command]
async fn ping(context: &Context, msg: &Message) -> CommandResult {
    check_msg(msg.channel_id.say(&context.http, "Pong!").await);

    Ok(())
}

#[command]
#[only_in(guilds)]
async fn play(ctx: &Context, msg: &Message, mut args: Args) -> CommandResult {
    let url = match args.single::<String>() {
        Ok(url) => url,
        Err(_) => {
            check_msg(msg.channel_id.say(&ctx.http, "Must provide a URL to a video or audio").await);

            return Ok(());
        },
    };

    if !url.starts_with("http") {
        check_msg(msg.channel_id.say(&ctx.http, "Must provide a valid URL").await);

        return Ok(());
    }

    let guild = msg.guild(&ctx.cache).await.unwrap();
    let guild_id = guild.id;

    let manager = songbird::get(ctx).await
        .expect("Songbird Voice client placed in at initialisation.").clone();

    if let Some(handler_lock) = manager.get(guild_id) {
        let mut handler = handler_lock.lock().await;

        let source = match songbird::ytdl(&url).await {
            Ok(source) => source,
            Err(why) => {
                println!("Err starting source: {:?}", why);

                check_msg(msg.channel_id.say(&ctx.http, "Error sourcing ffmpeg").await);

                return Ok(());
            },
        };

        handler.play_source(source);

        check_msg(msg.channel_id.say(&ctx.http, "Playing song").await);
    } else {
        check_msg(msg.channel_id.say(&ctx.http, "Not in a voice channel to play in").await);
    }

    Ok(())
}

#[command]
#[only_in(guilds)]
async fn undeafen(ctx: &Context, msg: &Message) -> CommandResult {
    let guild = msg.guild(&ctx.cache).await.unwrap();
    let guild_id = guild.id;

    let manager = songbird::get(ctx).await
        .expect("Songbird Voice client placed in at initialisation.").clone();

    if let Some(handler_lock) = manager.get(guild_id) {
        let mut handler = handler_lock.lock().await;
        if let Err(e) = handler.deafen(false).await {
            check_msg(msg.channel_id.say(&ctx.http, format!("Failed: {:?}", e)).await);
        }

        check_msg(msg.channel_id.say(&ctx.http, "Undeafened").await);
    } else {
        check_msg(msg.channel_id.say(&ctx.http, "Not in a voice channel to undeafen in").await);
    }

    Ok(())
}

#[command]
#[only_in(guilds)]
async fn unmute(ctx: &Context, msg: &Message) -> CommandResult {
    let guild = msg.guild(&ctx.cache).await.unwrap();
    let guild_id = guild.id;
    
    let manager = songbird::get(ctx).await
        .expect("Songbird Voice client placed in at initialisation.").clone();

    if let Some(handler_lock) = manager.get(guild_id) {
        let mut handler = handler_lock.lock().await;
        if let Err(e) = handler.mute(false).await {
            check_msg(msg.channel_id.say(&ctx.http, format!("Failed: {:?}", e)).await);
        }

        check_msg(msg.channel_id.say(&ctx.http, "Unmuted").await);
    } else {
        check_msg(msg.channel_id.say(&ctx.http, "Not in a voice channel to unmute in").await);
    }

    Ok(())
}

/// Checks that a message successfully sent; if not, then logs why to stdout.
fn check_msg(result: SerenityResult<Message>) {
    if let Err(why) = result {
        println!("Error sending message: {:?}", why);
    }
}