mod captcha_solutions;
mod config;
mod errors;
mod forms;
mod logging;
mod mailer;
mod routes;
mod states;
mod templates;

use anyhow::{Context, Result};
use axum::{
    routing::{get, get_service, Router},
    Server,
};
use std::{env, net::SocketAddr, path::PathBuf, process};
use tower_http::services::ServeDir;
use tracing::{error, info};

use crate::{config::Config, states::AppState};

const DATA_DIR_ENV_VAR: &str = "CF_DATA_DIR";

async fn init(logger_initialized: &mut bool) -> Result<()> {
    let data_dir = PathBuf::from(
        env::var(DATA_DIR_ENV_VAR)
            .with_context(|| format!("Environment variable {DATA_DIR_ENV_VAR} missing!"))?,
    );

    let config = Config::build(&data_dir)?;

    logging::init_logger(&data_dir, &config.utc_offset)?;
    *logger_initialized = true;

    // The path prefix of all routes.
    let path_prefix = config.state_config.path_prefix.clone();

    let socket_address = config
        .socket_address
        .parse::<SocketAddr>()
        .context("Failed to parse the socket address: {e:?}")?;

    let app_state = AppState::build(config).await?;

    // The service for serving the static files.
    let static_service = get_service(ServeDir::new("static"));

    let routes = Router::new()
        .route("/", get(routes::index).post(routes::submit))
        .with_state(app_state)
        .nest_service("/static", static_service);

    let app = {
        if path_prefix.is_empty() {
            // No need to nest.
            routes
        } else {
            Router::new().nest(&path_prefix, routes)
        }
    };

    info!("Starting server");
    Server::bind(&socket_address)
        .serve(app.into_make_service())
        .await?;

    Ok(())
}

/// Single thread.
#[tokio::main(flavor = "current_thread")]
async fn main() {
    let mut logger_initialized = false;

    if let Err(e) = init(&mut logger_initialized).await {
        if logger_initialized {
            error!("{e:?}");
        } else {
            eprintln!("{e:?}");
        }
        process::exit(1);
    };
}