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use serenity::{
    client::Context,
    model::{
        id::{
            ChannelId,
            MessageId,
        },
        permissions::Permissions,
    },
};

use lazy_static::lazy_static;
use log::debug;
use serenity::{
    all::CreateMessage,
    futures::{
        AsyncReadExt,
        StreamExt,
    },
};
use url::Url;

use crate::{
    audio::PlayQueue,
    Result,
    CONFIG,
};

pub async fn currently_playing(ctx: &Context) -> bool {
    let queue_lock = {
        let data = ctx.data.read().await;
        data.get::<PlayQueue>().cloned().unwrap()
    };

    let play_queue = queue_lock.read().unwrap();
    play_queue.playing.is_some()
}

pub async fn users_listening(ctx: &Context) -> Result<bool> {
    let channel = CONFIG.discord.voice_channel().to_channel(&ctx).await?;

    let res = channel
        .guild()
        .and_then(|ch| ch.guild(&ctx))
        .map(|g| {
            (&g.voice_states)
                .into_iter()
                .any(|(_, state)| state.channel_id == Some(CONFIG.discord.voice_channel()))
        })
        .unwrap_or(false);

    Ok(res)
}

#[inline]
pub async fn send(
    ctx: &Context,
    channel: ChannelId,
    text: impl AsRef<str>,
    tts: bool,
) -> Result<()> {
    send_result(ctx, channel, text, tts).await.map(|_| ())
}

pub async fn send_result(
    ctx: &Context,
    channel: ChannelId,
    text: impl AsRef<str>,
    tts: bool,
) -> Result<MessageId> {
    let text = text.as_ref();
    debug!("sending message {:?} to channel {:?} (tts: {})", text, channel, tts);

    let result = channel.send_message(ctx, CreateMessage::default().content(text).tts(tts)).await?;
    Ok(result.id)
}

lazy_static! {
    static ref REQUIRED_PERMS: Permissions = Permissions::EMBED_LINKS
        | Permissions::READ_MESSAGES
        | Permissions::ADD_REACTIONS
        | Permissions::SEND_MESSAGES
        | Permissions::SEND_TTS_MESSAGES
        | Permissions::MENTION_EVERYONE
        | Permissions::USE_EXTERNAL_EMOJIS
        | Permissions::CONNECT
        | Permissions::SPEAK
        | Permissions::CHANGE_NICKNAME
        | Permissions::USE_VAD
        | Permissions::ATTACH_FILES;
}

lazy_static! {
    pub static ref OAUTH_URL: Url = Url::parse(&format!(
        "https://discordapp.com/api/oauth2/authorize?scope=bot&permissions={}&client_id={}",
        REQUIRED_PERMS.bits(),
        CONFIG.discord.auth.client_id,
    ))
    .unwrap();
}