use serenity::{
  async_trait,
  client::{Context, EventHandler},
  model::{
    gateway::{GatewayIntents, Ready},
    guild,
    prelude::RoleId,
  },
  Client,
};
use std::sync::Arc;

use skynet_discord_bot::{db_init, get_config, get_server_config, get_server_member, Config, DataBase};
use tokio::sync::RwLock;

struct Handler;

#[async_trait]
impl EventHandler for Handler {
  async fn guild_member_addition(&self, ctx: Context, mut new_member: guild::Member) {
    let db_lock = {
      let data_read = ctx.data.read().await;
      data_read.get::<DataBase>().expect("Expected Config in TypeMap.").clone()
    };

    let db = db_lock.read().await;
    let config = match get_server_config(&db, &new_member.guild_id).await {
      None => return,
      Some(x) => x,
    };

    if get_server_member(&db, &new_member.guild_id, &new_member).await.is_some() {
      let mut roles = vec![];

      if let Some(role) = &config.role_past {
        let role = RoleId::from(*role as u64);
        if !new_member.roles.contains(&role) {
          roles.push(role.to_owned());
        }
      }

      if let Some(role) = &config.role_current {
        let role = RoleId::from(*role as u64);
        if !new_member.roles.contains(&role) {
          roles.push(role.to_owned());
        }
      }

      if let Err(e) = new_member.add_roles(&ctx, &roles).await {
        println!("{:?}", e);
      }
    }
  }

  async fn ready(&self, _ctx: Context, ready: Ready) {
    println!("[Main] {} is connected!", ready.user.name);
  }
}

#[tokio::main]
async fn main() {
  let config = get_config();
  let db = match db_init(&config).await {
    Ok(x) => x,
    Err(_) => return,
  };

  // Intents are a bitflag, bitwise operations can be used to dictate which intents to use
  let intents = GatewayIntents::GUILDS | GatewayIntents::GUILD_MESSAGES | GatewayIntents::MESSAGE_CONTENT | GatewayIntents::GUILD_MEMBERS;
  // Build our client.
  let mut client = Client::builder(&config.discord_token, intents)
    .event_handler(Handler {})
    .await
    .expect("Error creating client");

  {
    let mut data = client.data.write().await;

    data.insert::<Config>(Arc::new(RwLock::new(config)));
    data.insert::<DataBase>(Arc::new(RwLock::new(db)));
  }

  // Finally, start a single shard, and start listening to events.
  //
  // Shards will automatically attempt to reconnect, and will perform
  // exponential backoff until it reconnects.
  if let Err(why) = client.start().await {
    println!("Client error: {:?}", why);
  }
}