use poise;
use serenity::{all::ChannelId, async_trait};
use songbird::events::{Event, EventContext, EventHandler as VoiceEventHandler};
use songbird::TrackEvent;

use crate::util::debug::send_error;
use crate::{types::{Context, Error}, util::utilities::get_channel_by_name};

use serenity::all::User;

#[poise::command(
    slash_command,
    description_localized("en-US", "Play song")
)]
pub async fn play(ctx: Context<'_>,
    #[description = "Song: "]
    _url: String
) -> Result<(), Error> {

    ctx.reply("Done!").await?;
    Ok(())
}



#[poise::command(
    slash_command,
    description_localized("en-US", "Headpat all your friends!")
)]
pub async fn headpat(ctx: Context<'_>,
    #[description = "Who is the lucky one?"]
    user: User
) -> Result<(), Error> {
    let _title = "HEADPATS!";
    let _desc = format!("{} headpats {}", ctx.author(), user);
    // send_with_embed(ctx, "headpat", &title, &desc).await?;
    ctx.reply("Done!").await?;
    Ok(())
}


#[poise::command(
    slash_command,
    description_localized("en-US", "Connect to channel")
)]
pub async fn connect(ctx: Context<'_>,
    #[autocomplete = "autocomplete_channel"]
    #[description = "Voice channel name: "]
    name: Option<String>
) -> Result<(), Error> {

    if ctx.guild().is_none() {
        ctx.reply("Can't use this outside of guild").await?;
        return Ok(())
    }

    let channel: ChannelId;
    if name.is_none() || name.clone().unwrap() == "" {
        // Ugly one liner since I don't know how to do this another way yet
        // TODO fix please
        let Some(voice_channel) = ctx.guild().unwrap().voice_states.get(&ctx.author().id).and_then(|voice_state| voice_state.channel_id) else {
            ctx.reply("You must be in a voice channel or specify explicit voice channel by name").await?;
            return Ok(())
        };

        channel = voice_channel;
    }
    else {
        channel = match get_channel_by_name(ctx.guild().unwrap(), name.unwrap()) {
            Some(channel) => channel,
            None =>  {
                ctx.reply("Channel with this name does not exist").await?;
                return Ok(());
            }
        };
    }

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

    if let Ok(handler_lock) = manager.join(ctx.guild_id().unwrap(), channel).await {
        let mut handler = handler_lock.lock().await;
        handler.add_global_event(TrackEvent::Error.into(), TrackErrorNotifier);
    }

    ctx.reply("Done!").await?;
    Ok(())
}


struct TrackErrorNotifier;

#[async_trait]
impl VoiceEventHandler for TrackErrorNotifier {
    async fn act(&self, ctx: &EventContext<'_>) -> Option<Event> {
        if let EventContext::Track(track_list) = ctx {
            for (state, handle) in *track_list {
                println!(
                    "Track {:?} encountered an error: {:?}",
                    handle.uuid(),
                    state.playing
                );
            }
        }

        None
    }
}

async fn autocomplete_channel(
    ctx: Context<'_>,
    _partial: &str,
) -> Vec<String> {

    use crate::util::utilities::get_vc_names;
    match ctx.guild() {
        Some(guild) => get_vc_names(guild),
        None => [].to_vec()
    }
}

#[poise::command(
    slash_command,
    description_localized("en-US", "Disconnect from voice channel")
)]
async fn disconnect(
    ctx: Context<'_>
) -> Result<(), Error> {

    let Some(guild_id) = ctx.guild_id() else {
        ctx.reply("Can't use this outside of guild").await?;
        return Ok(());
    };

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

    let has_handler = manager.get(guild_id).is_some();

    if ! has_handler {
        ctx.reply("I am not connected to a channel!").await?;
        return Ok(())
    }

    match manager.remove(guild_id).await {
        Ok(()) => {
            ctx.reply("Disconnected").await?;
            return Ok(())
        }
        Err(e) => {
            let _ = send_error(ctx.serenity_context().http.clone(), e.to_string()).await;
            return Ok(())
        }
    }
}