mod db;
mod error;
mod extract;
mod handlers;
mod models;
#[cfg(test)]
mod tests;

use std::env;

use axum::{Router, routing::get};
use dotenvy::dotenv;
use sqlx::PgPool;
use tracing_subscriber::EnvFilter;

use crate::error::AppError;

const BIND_ADDRESS_FALLBACK: &str = "127.0.0.1:8991";

fn router(pool: PgPool) -> Router {
    Router::new()
        .route("/health", get(handlers::health))
        .route(
            "/measurements",
            get(handlers::list_measurements).post(handlers::create_measurement),
        )
        .route("/measurements/export", get(handlers::export_measurements))
        .route(
            "/measurements/{id}",
            get(handlers::get_measurement)
                .put(handlers::update_measurement)
                .delete(handlers::delete_measurement),
        )
        .route("/metric-types", get(handlers::metric_types))
        .fallback(async || AppError::NotFound)
        .method_not_allowed_fallback(async || AppError::MethodNotAllowed)
        .with_state(pool)
}

#[tokio::main]
async fn main() -> anyhow::Result<()> {
    dotenv().ok();
    tracing_subscriber::fmt()
        .with_env_filter(
            EnvFilter::try_from_default_env().unwrap_or_else(|_| EnvFilter::new("info")),
        )
        .init();
    let pool = db::connect().await?;
    tracing::info!("connected to database");
    let app = router(pool);
    let bind_address = env::var("HEALTH_BIND_ADDRESS").unwrap_or_else(|_| {
        tracing::info!("HEALTH_BIND_ADDRESS not set, falling back to {BIND_ADDRESS_FALLBACK}");
        BIND_ADDRESS_FALLBACK.to_string()
    });
    let listener = tokio::net::TcpListener::bind(bind_address).await?;
    tracing::info!("listening at {}", listener.local_addr()?);
    axum::serve(listener, app).await?;
    Ok(())
}