mod commands;
mod data_loader;
mod utils;
mod racetime;

use racetime::race::Races;

use std::collections::HashMap;
use std::sync::Arc;
use std::sync::atomic::AtomicU64;
use std::sync::atomic::{AtomicBool, Ordering};
use std::time::Duration;

use serenity::async_trait;
use serenity::prelude::*;
use serenity::model::channel::{Message, Reaction};
use serenity::model::gateway::Ready;
use serenity::model::id::GuildId;
use serenity::http::Http;

struct Owner;

impl TypeMapKey for Owner
{
    type Value = Arc<AtomicU64>;
}

struct Handler
{
    is_loop_running: AtomicBool,
}

#[async_trait]
impl EventHandler for Handler 
{
    // Set a handler for the `message` event - so that whenever a new message
    // is received - the closure (or function) passed will be called.
    //
    // Event handlers are dispatched through a threadpool, and so multiple
    // events can be dispatched simultaneously.
    async fn message(&self, ctx: Context, msg: Message) 
    {
        commands::parse(ctx, msg).await;    
    }

    async fn reaction_add(&self, ctx: Context, add_reaction: Reaction) 
    {
        // println!("reaction_add event");
        utils::Logger::log_message(ctx.clone(), &format!("reaction add event, emoji: {:#?}", add_reaction.emoji)).await;
        // todo!()

        commands::handle_reaction_add(ctx, add_reaction).await;
    }

    async fn reaction_remove(&self, ctx: Context, removed_reaction: Reaction) 
    {
        // println!("reaction_remove event");
        // utils::Logger::log_message(ctx, &format!("reaction removed event: {:#?}", removed_reaction)).await;

        commands::handle_reaction_remove(ctx, removed_reaction).await;
    }

    // Set a handler to be called on the `ready` event. This is called when a
    // shard is booted, and a READY payload is sent by Discord. This payload
    // contains data like the current user's guild Ids, current user data,
    // private channels, and more.
    //
    // In this case, just print what the current user's username is.
    async fn ready(&self, ctx: Context, ready: Ready) 
    {
        println!("{} is connected!", ready.user.name);
        utils::Logger::log_message(ctx.clone(), "Start up and connection successful!").await;

        if let Err(why) = commands::initialize(ctx.clone()).await
        {
            utils::Logger::log_error(ctx.clone(), &format!("Failed to initialize commands module: {}", why)).await;
        }
        else
        {
            utils::Logger::log_message(ctx.clone(), "Module initialization successful!").await;
        }
    }

    // CODE TAKEN FROM EXAMPLE:
    // https://github.com/serenity-rs/serenity/blob/current/examples/e13_parallel_loops/src/main.rs
    // We use the cache_ready event just in case some cache operation is required in whatever use
    // case you have for this.
    async fn cache_ready(&self, ctx: Context, _guilds: Vec<GuildId>) 
    {
        println!("Cache built successfully!");
        utils::Logger::log_message(ctx.clone(), "Cache built successfully!").await;

        // it's safe to clone Context, but Arc is cheaper for this use case.
        // Untested claim, just theoretically. :P
        let ctx = Arc::new(ctx);

        // We need to check that the loop is not already running when this event triggers,
        // as this event triggers every time the bot enters or leaves a guild, along every time the
        // ready shard event triggers.
        //
        // An AtomicBool is used because it doesn't require a mutable reference to be changed, as
        // we don't have one due to self being an immutable reference.
        if !self.is_loop_running.load(Ordering::Relaxed) {
            // We have to clone the Arc, as it gets moved into the new thread.
            let ctx1 = Arc::clone(&ctx);
            // tokio::spawn creates a new green thread that can run in parallel with the rest of
            // the application.
            tokio::spawn(async move {
                loop {
                    // We clone Context again here, because Arc is owned, so it moves to the
                    // new function.
                    //log_system_load(Arc::clone(&ctx1)).await;

                    // TODO: function we want to run called here
                    //      Run racetime.gg and twitch api checks
                    //      Post new stuff to discord channel
                    racetime::poll_races(Arc::clone(&ctx1)).await;
                    
                    tokio::time::sleep(Duration::from_secs(60)).await;
                }
            });

            // Now that the loop is running, we set the bool to true
            self.is_loop_running.swap(true, Ordering::Relaxed);
        }
    }
}


#[tokio::main]
async fn main() 
{
    let token = match data_loader::load_token("secrets/test.txt")
    {
        Ok(t) => t,
        Err(why) => panic!("Could not load app token: {}", why),
    };

     // Fetch the application owner id
    let http = Http::new(&token);
    let owner = match http.get_current_application_info().await 
    {
        Ok(info) => info.owner.id,
        Err(why) => panic!("Could not access application info: {:?}", why),
    };


    //let race = Race { name: String::from("Test"), game: String::from("Test"), goal: String::from("Test"), status: Status::Open };

    println!("Connecting...");

    let intents = GatewayIntents::GUILD_MESSAGES
        | GatewayIntents::DIRECT_MESSAGES
        | GatewayIntents::GUILDS
        | GatewayIntents::GUILD_MESSAGE_REACTIONS
        | GatewayIntents::MESSAGE_CONTENT;

    // Create a new instance of the Client, logging in as a bot. This will
    // automatically prepend your bot token with "Bot ", which is a requirement
    // by Discord for bot users.
    let mut client = Client::builder(&token, intents).event_handler(Handler
        { 
            is_loop_running: AtomicBool::new(false),
        }).await.expect("Err creating client");


    // Set the global data
    // https://github.com/serenity-rs/serenity/blob/current/examples/e12_global_data/src/main.rs
    {
        // Open the data lock in write mode, so keys can be inserted to it.
        let mut data = client.data.write().await;

        data.insert::<Owner>(Arc::new(AtomicU64::new(owner.into())));
        data.insert::<Races>(Arc::new(RwLock::new(HashMap::new())));
    }


    // 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);
    }
    
}