use chrono::{SecondsFormat, Utc};
use std::sync::OnceLock;
use tracing_subscriber::EnvFilter;

static INITIALIZED: OnceLock<()> = OnceLock::new();

/// Inicializa logs JSON. Cada evento emitido pelas funções deste módulo contém
/// horário UTC, módulo, request_id, nível e mensagem.
pub fn init() {
    INITIALIZED.get_or_init(|| {
        let filter =
            EnvFilter::try_from_default_env().unwrap_or_else(|_| EnvFilter::new("backend=info"));
        let _ = tracing_subscriber::fmt()
            .with_env_filter(filter)
            .json()
            .with_current_span(false)
            .with_span_list(false)
            .try_init();
    });
}

pub fn info(module: &str, request_id: &str, message: impl AsRef<str>) {
    let timestamp = Utc::now().to_rfc3339_opts(SecondsFormat::Millis, true);
    tracing::info!(
        timestamp = %timestamp,
        module = %module,
        request_id = %request_id,
        message = %message.as_ref()
    );
}

pub fn warn(module: &str, request_id: &str, message: impl AsRef<str>) {
    let timestamp = Utc::now().to_rfc3339_opts(SecondsFormat::Millis, true);
    tracing::warn!(
        timestamp = %timestamp,
        module = %module,
        request_id = %request_id,
        message = %message.as_ref()
    );
}

pub fn error(module: &str, request_id: &str, message: impl AsRef<str>) {
    let timestamp = Utc::now().to_rfc3339_opts(SecondsFormat::Millis, true);
    tracing::error!(
        timestamp = %timestamp,
        module = %module,
        request_id = %request_id,
        message = %message.as_ref()
    );
}

#[cfg(test)]
mod tests {
    #[test]
    fn logger_can_be_initialized_more_than_once() {
        super::init();
        super::init();
        super::info("logs", "test-request", "logger pronto");
    }
}