use serenity::{
  all::{ChunkGuildFilter, GuildId, GuildMembersChunkEvent},
  async_trait,
  client::{Context, EventHandler},
  model::gateway::GatewayIntents,
  Client,
};
use skynet_discord_bot::{
  common::{
    database::{db_init, DataBase},
    set_roles::committee::db_roles_get,
  },
  get_config, Config,
};
use sqlx::{Pool, Sqlite};
use std::{process, sync::Arc};
use tokio::sync::RwLock;

/// Cleanup teh Committee server
///
/// This removes any invalid roles/channels which ay have been set up accidentally
/// DO NOT run this locally unless you have a fresh copy of teh live database handy.
#[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 {})
    .cache_settings(serenity::cache::Settings::default())
    .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)));
  }

  if let Err(why) = client.start().await {
    println!("Client error: {why:?}");
  }
}

struct Handler;
#[async_trait]
impl EventHandler for Handler {
  async fn cache_ready(&self, ctx: Context, guilds: Vec<GuildId>) {
    for guild in guilds {
      ctx.shard.chunk_guild(guild, Some(2000), false, ChunkGuildFilter::None, None);
    }
    println!("Cache built successfully!");
  }

  async fn guild_members_chunk(&self, ctx: Context, chunk: GuildMembersChunkEvent) {
    if (chunk.chunk_index + 1) == chunk.chunk_count {
      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_lock = {
        let data_read = ctx.data.read().await;
        data_read.get::<Config>().expect("Expected Config in TypeMap.").clone()
      };
      let config = config_lock.read().await;

      cleanup(&db, &ctx, &config).await;
      // finish up
      process::exit(0);
    }
  }
}

async fn cleanup(db: &Pool<Sqlite>, ctx: &Context, config: &Config) {
  let server = config.committee_server;
  let committees = db_roles_get(db).await;

  if let Ok(channels) = server.channels(ctx).await {
    for (id, channel) in &channels {
      let name = &channel.name;
      let committee_tmp = committees.iter().filter(|x| &x.name_channel == name).collect::<Vec<_>>();
      let committee = match committee_tmp.first() {
        // if there are no committees which match then this is not a channelw e care about
        None => {
          continue;
        }
        Some(x) => x,
      };

      // if the id of the channel does not match then remove it
      if id != &committee.id_channel {
        println!("Deleting Channel - ID: {} Name: {}", id, &channel.name);
        if let Err(e) = channel.delete(ctx).await {
          dbg!(e);
        }
      }
    }
  }

  if let Ok(mut roles) = server.roles(ctx).await {
    for (id, role) in &mut roles {
      let name = &role.name;
      let committee_tmp = committees.iter().filter(|x| &x.name_role == name).collect::<Vec<_>>();
      let committee = match committee_tmp.first() {
        // if there are no committees which match then this is not a channelw e care about
        None => {
          continue;
        }
        Some(x) => x,
      };

      // if the id of the role does not match then remove it
      if id != &committee.id_role {
        println!("Deleting Role - ID: {} Name: {}", id, &role.name);
        if let Err(e) = role.delete(ctx).await {
          dbg!(e);
        }
      }
    }
  }
}