use regex::Regex;
use serenity::async_trait;
use serenity::client::Client;
use serenity::framework::standard::{
    macros::{command, group},
    CommandResult, StandardFramework,
};
use serenity::model::channel::Message;
use serenity::prelude::{Context, EventHandler, TypeMapKey};
use sqlx::sqlite::SqlitePool;
use std::env;

struct Handler {
    ah_regex: Regex,
    best_doctor_regex: Regex,
}

impl Default for Handler {
    fn default() -> Self {
        Self {
            ah_regex: Regex::new(r"A+H{5,}").unwrap(),
            best_doctor_regex: Regex::new(r"[iI].*(?:best|genius) doc").unwrap(),
        }
    }
}

#[async_trait]
impl EventHandler for Handler {
    async fn message(&self, ctx: Context, message: Message) {
        let content = &message.content_safe(ctx.clone()).await;
        if self.ah_regex.is_match(content) {
            message
                .channel_id
                .say(ctx, "its ok ur gonna get a 6* someday")
                .await
                .unwrap();
        } else if self.best_doctor_regex.is_match(content) {
            message
                .channel_id
                .say(ctx, "no, u is smol brain doctor...")
                .await
                .unwrap();
        }
    }
}

struct DbConnPool {
    pool: sqlx::pool::Pool<sqlx::sqlite::SqliteConnection>,
}
impl DbConnPool {
    async fn get_heck(&self) -> i32 {
        sqlx::query!("UPDATE Heck SET count = count + 1")
            .execute(&self.pool)
            .await
            .unwrap();

        sqlx::query!("SELECT count FROM Heck")
            .fetch_one(&self.pool)
            .await
            .unwrap()
            .count
    }
}
impl TypeMapKey for DbConnPool {
    type Value = Self;
}

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    dotenv::dotenv().ok();

    let framework = StandardFramework::new()
        .configure(|c| c.prefix("~"))
        .group(&GENERAL_GROUP);

    // Login with a bot token from the environment
    let mut client =
        Client::new_with_extras(&env::var("DISCORD_TOKEN").expect("token"), |extras| {
            extras
                .event_handler(Handler::default())
                .framework(framework)
        })
        .await
        .expect("Error creating client");

    let pool = SqlitePool::builder()
        .build(&env::var("DATABASE_URL").unwrap())
        .await?;

    init_pool(&pool).await;

    {
        let mut data = client.data.write().await;
        data.insert::<DbConnPool>(DbConnPool { pool });
    }

    // start listening for events by starting a single shard
    if let Err(why) = client.start().await {
        println!("An error occurred while running the client: {:?}", why);
    }

    Ok(())
}

async fn init_pool(pool: &sqlx::pool::Pool<sqlx::sqlite::SqliteConnection>) {
    sqlx::query!(
        "CREATE TABLE IF NOT EXISTS Heck (id INTEGER PRIMARY KEY NOT NULL, count INTEGER NOT NULL)"
    )
    .execute(pool)
    .await
    .unwrap();

    if sqlx::query!("SELECT count FROM Heck")
        .fetch_all(pool)
        .await
        .unwrap()
        .is_empty()
    {
        sqlx::query!("INSERT INTO Heck VALUES (1, 0)")
            .execute(pool)
            .await
            .unwrap();
    }
}

#[group]
#[commands(heck)]
struct General;
#[command]
async fn heck(ctx: &mut Context, msg: &Message) -> CommandResult {
    let db_pool = ctx.data.clone();
    let mut db_pool = db_pool.write().await;
    let db_pool = db_pool.get_mut::<DbConnPool>().unwrap();
    let value = db_pool.get_heck().await;
    msg.channel_id
        .say(ctx, format!("This command has been hecked {} times", value))
        .await?;

    Ok(())
}