//! Observability module for distributed tracing and metrics
//!
//! Integrates with OpenTelemetry for distributed tracing.

/// Initialize distributed tracing
pub fn init_tracing() -> anyhow::Result<()> {
    // In production, would initialize OpenTelemetry tracing
    // Example configuration:
    // let tracer = opentelemetry_jaeger::new_pipeline()
    //     .install_simple()?;
    // let telemetry = tracing_opentelemetry::layer().with_tracer(tracer);
    // tracing_subscriber::registry()
    //     .with(telemetry)
    //     .with(tracing_subscriber::fmt::layer())
    //     .init();

    tracing::info!("Distributed tracing initialized");
    Ok(())
}

/// Trace context
#[derive(Debug, Clone)]
pub struct TraceContext {
    /// Trace ID
    pub trace_id: String,
    /// Span ID
    pub span_id: String,
    /// Service name
    pub service: String,
}

impl TraceContext {
    /// Create new trace context
    pub fn new(service: &str) -> Self {
        Self {
            trace_id: uuid::Uuid::new_v4().to_string(),
            span_id: uuid::Uuid::new_v4().to_string(),
            service: service.to_string(),
        }
    }

    /// Log with context
    pub fn log(&self, message: &str) {
        tracing::info!(
            trace_id = %self.trace_id,
            span_id = %self.span_id,
            service = %self.service,
            "{}", message
        );
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_init_tracing() {
        let result = init_tracing();
        assert!(result.is_ok());
    }

    #[test]
    fn test_trace_context_creation() {
        let ctx = TraceContext::new("test-service");
        assert_eq!(ctx.service, "test-service");
        assert!(!ctx.trace_id.is_empty());
        assert!(!ctx.span_id.is_empty());
    }

    #[test]
    fn test_trace_context_log() {
        let ctx = TraceContext::new("test");
        ctx.log("Test message");
    }
}
