use std::vec;

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

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

#[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(())
}

/// Returns either voice channel to which the user is currently connected to or the one passed via name
async fn get_voice_channel(ctx: &Context<'_>, name: Option<String>) -> Result<ChannelId, String> {
    if name.is_none() || name.as_ref().is_some_and(|n| n.is_empty()) {
        match ctx.guild().and_then(|guild|
            guild.voice_states.get(&ctx.author().id).and_then(|voice_state|
                voice_state.channel_id
        ) 
        ) {
            Some(c) => Ok(c),
            None => Err("You must be in a voice channel or specify explicit voice channel by name".to_string())
        }
    }
    else {
        match ctx.guild().and_then(|guild|
            get_channel_by_name(guild, name.unwrap()) 
        ) {
            Some(c) => Ok(c),
            None => Err("Channel with this name does not exist".to_string())
        }
    }
}

#[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_ephemeral("Can't use this outside of guild").await?;
        return Ok(());
    }

    let voice_channel = match get_voice_channel(&ctx, name).await {
        Ok(c) => c,
        Err(e) => {
            ctx.reply_ephemeral(e.as_str()).await?;
            return Ok(())
        }
    };

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

    let Some(guild_id) = ctx.guild_id() else {
        ctx.reply_ephemeral("Guild id not found").await?;
        return Ok(())
    };

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

    ctx.reply_ephemeral("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")
)]
pub 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(())
        }
    }
}

async fn autocomplete_song(
    _ctx: Context<'_>,
    partial: &str,
) -> Vec<String> {

    match get_local_songs(partial) {
        Ok(names) => names,
        Err(_) => vec![]
    }
}

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

    if ctx.guild().is_none() {
        ctx.reply_ephemeral("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 Some(guild_id) = ctx.guild_id() else {
        ctx.reply_ephemeral("Guild id not found").await?;
        return Ok(())
    };

    

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

        let input_file = File::new(format!("/home/emil/Music/{file_name}"));
        let input = Input::Lazy(Box::new(input_file));
        let _ = handler.play_input(input);
    }
    else {

        ctx.reply_ephemeral("Not in a voice channel").await?;
        return Ok(())
    }

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

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

//     if ctx.guild().is_none() {
//         ctx.reply_ephemeral("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 Some(guild_id) = ctx.guild_id() else {
//         ctx.reply_ephemeral("Guild id not found").await?;
//         return Ok(())
//     };

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

//         let input_file = File::new(format!("/home/emil/Music/{file_name}"));
//         let input = Input::Lazy(Box::new(input_file));
//         let _ = handler.play_input(input);
//     }
//     else {
//         ctx.reply_ephemeral("Not in a voice channel").await?;
//         return Ok(())
//     }

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