#![cfg(feature = "normalized_dev")]

use once_cell::sync::Lazy;
use std::sync::Mutex;

/// RAII guard for normalized_dev env toggling (NYASH_JOINIR_NORMALIZED_DEV_RUN).
/// 汚染防止のため tests/runner の両方で再利用できるようにここに置く。
pub struct NormalizedDevEnvGuard {
    _lock: std::sync::MutexGuard<'static, ()>,
    prev: Option<String>,
}

static NORMALIZED_ENV_LOCK: Lazy<Mutex<()>> = Lazy::new(|| Mutex::new(()));

impl NormalizedDevEnvGuard {
    pub fn new(enabled: bool) -> Self {
        let lock = NORMALIZED_ENV_LOCK
            .lock()
            .expect("normalized env mutex poisoned");
        let prev = std::env::var("NYASH_JOINIR_NORMALIZED_DEV_RUN").ok();
        if enabled {
            std::env::set_var("NYASH_JOINIR_NORMALIZED_DEV_RUN", "1");
        } else {
            std::env::remove_var("NYASH_JOINIR_NORMALIZED_DEV_RUN");
        }
        Self { _lock: lock, prev }
    }
}

impl Drop for NormalizedDevEnvGuard {
    fn drop(&mut self) {
        if let Some(prev) = &self.prev {
            std::env::set_var("NYASH_JOINIR_NORMALIZED_DEV_RUN", prev);
        } else {
            std::env::remove_var("NYASH_JOINIR_NORMALIZED_DEV_RUN");
        }
    }
}