mod account;
mod model;

use anyhow::Result;
use axum::{
    body::Body,
    response::{IntoResponse, Response}
};
use http::{StatusCode, Uri};

pub type ApiResult = Result<Response, AppError>;

pub async fn run() -> Result<()> {
    
    let app = router();
    let port = std::env::var("API_PORT")?; 
    let listener = tokio::net::TcpListener::bind(format!("127.0.0.1:{port}")).await.unwrap();
    axum::serve(listener, app).await.unwrap();
    

    Ok(())
}

fn router() -> axum::Router {
    axum::Router::new()
        .nest("/account", account::router())
        .fallback(not_found)
        .nest("/predict", model::router())
}

pub struct AppError(anyhow::Error);

impl IntoResponse for AppError {
    fn into_response(self) -> Response {
        (
            StatusCode::INTERNAL_SERVER_ERROR,
            format!("Something went wrong: {}", self.0),
        )
            .into_response()
    }
}

impl<E> From<E> for AppError
where
    E: Into<anyhow::Error>,
{
    fn from(err: E) -> Self {
        Self(err.into())
    }
}

async fn not_found(uri: Uri) -> ApiResult {
    Ok(Response::builder()
        .status(StatusCode::NOT_FOUND)
        .body(Body::from(format!("The route {uri} does not exist")))?)
}