use phoebe::{
    mid_chat::{self, ChatMessage, ChatMessageReference, ChatReference},
    prelude::*,
    DynServiceLookup,
};
use serenity::{client::Context, Client};
use tracing::{debug, info};

mod chat_conv;
mod handler;
mod lookup;
mod sender;

pub fn discord_reference(id: impl ToString) -> mid_chat::ChatReference {
    mid_chat::ChatReference {
        service: "discord",
        id: id.to_string(),
    }
}

pub struct DiscordService {
    pub core_db: SqlitePool,
    pub discord_media_db: SqlitePool,
    pub ctx: Context,
    pub dyn_service: DynServiceLookup,
}

pub async fn setup(
    core_db: SqlitePool,
    tx: ChatEventSender,
    dyn_service: DynServiceLookup,
) -> Result<DiscordService> {
    info!("Setting up Discord service…");

    let discord_media_db = phoebe::db::open("discord_media").await?;
    sqlx::migrate!().run(&discord_media_db).await?;

    let (ctx_tx, mut ctx_rx) = tokio::sync::mpsc::unbounded_channel::<Context>();

    let discord_handler = handler::DiscordHandler {
        core_db: core_db.clone(),
        discord_media_db: discord_media_db.clone(),
        chat_event_tx: tx,
        ctx_tx,
    };

    debug!("Logging in…");
    let discord_token = std::env::var("PHOEBE_DISCORD_TOKEN")
        .expect("PHOEBE_DISCORD_TOKEN environment variable was not set!");

    let mut client = Client::builder(&discord_token)
        .event_handler(discord_handler)
        .await?;

    tokio::spawn(async move {
        client
            .start()
            .await
            .expect("Failed to start Discord client")
    });

    let discord_ctx = ctx_rx.recv().await.expect("Couldn't get Discord context");
    debug!("Logged in!");

    Ok(DiscordService {
        core_db,
        discord_media_db,
        ctx: discord_ctx,
        dyn_service,
    })
}

#[async_trait]
impl Service for DiscordService {
    fn tag(&self) -> &'static str {
        "discord"
    }

    async fn send_chat_message(
        &mut self,
        source: &ChatMessage,
        destination_channel: ChatReference,
    ) -> Vec<ChatMessageReference> {
        assert_eq!(destination_channel.service, "discord");
        sender::send_discord_message(self, source, destination_channel)
            .await
            .ok()
            .into_iter()
            .collect()
    }

    async fn delete_message(&mut self, message: &ChatMessageReference) -> bool {
        assert_eq!(message.channel.service, "discord");
        sender::delete_discord_message(self, message).await.is_ok()
    }
}