//! Process-wide ONNX Runtime environment.
//!
//! ONNX Runtime allows a single environment per process (`ort::init().build()`
//! fails on the second call), yet every [`Session`](ort::session::Session) must
//! be built from it. This module lazily creates that environment once and hands
//! out cheap `Arc` clones, so the STT and VAD pipelines share it.

use anyhow::{Context, Result};
use ort::environment::Environment;
use parking_lot::Mutex;

static ENVIRONMENT: Mutex<Option<Environment>> = Mutex::new(None);

/// Return the shared ONNX Runtime environment, creating it on first use.
pub fn environment() -> Result<Environment> {
    let mut guard = ENVIRONMENT.lock();
    if let Some(env) = guard.as_ref() {
        return Ok(env.clone());
    }
    let env = ort::init()
        .build()
        .context("failed to create ONNX Runtime environment")?;
    *guard = Some(env.clone());
    Ok(env)
}