use tokio::sync::Mutex;
use crate::config::Config;
use anyhow::Context;
use rand::{rngs::StdRng, SeedableRng};
use sqlx::MySqlPool;
use std::sync::Arc;
use structopt::StructOpt;
use tera::Tera;
use warp::Filter;

mod config;
mod handlers;
mod util;

#[derive(StructOpt)]
struct Opt {
    #[structopt(index = 1, help = "config file to use")]
    config: String,
}

#[tokio::main]
async fn main() -> anyhow::Result<()> {
    env_logger::init();
    let opt = Opt::from_args();

    let config = load_config(&opt.config)
        .await
        .context("error loading config")?;

    let pool = MySqlPool::connect(&config.database_url)
        .await
        .context("error creating mysql pool")?;

    let mut tera = Tera::default();
    tera.add_raw_templates(vec![
        ("index.html", include_str!("../assets/index.html.tera")),
        ("success.html", include_str!("../assets/success.html.tera")),
    ])
    .context("error adding templates to tera")?;

    let brevo = Arc::new(Brevo {
        config,
        pool,
        tera,
        rng: Mutex::new(StdRng::from_rng(rand::thread_rng())?),
    });
    let brevo_idx = Arc::clone(&brevo);
    let brevo_submit = Arc::clone(&brevo);
    let brevo_srv = Arc::clone(&brevo);

    let routes = warp::get()
        .and(
            warp::path::end()
                .and_then(move || handlers::index(Arc::clone(&brevo_idx)))
                .or(warp::path::param::<String>()
                    .and(warp::path::end())
                    .and_then(move |id| handlers::shortened(id, Arc::clone(&brevo)))),
        )
        .or(warp::post()
            .and(warp::body::content_length_limit(1024 * 16))
            .and(warp::body::form())
            .and_then(move |form_data| handlers::submit(form_data, Arc::clone(&brevo_submit))));

    warp::serve(routes).run(brevo_srv.config.bind_addr).await;

    Ok(())
}

async fn load_config(path: &str) -> anyhow::Result<Config> {
    let data = tokio::fs::read(path).await?;
    Ok(toml::from_slice::<Config>(&data)?)
}

pub struct Brevo {
    pub config: Config,
    pub pool: MySqlPool,
    pub tera: Tera,
    pub rng: Mutex<StdRng>,
}