use js_sys::{Array, Intl, Object, Reflect};

use wasm_bindgen::JsValue;

pub(crate) fn get_timezone_inner() -> Result<String, crate::GetTimezoneError> {

    let intl = Intl::DateTimeFormat::new(&Array::new(), &Object::new()).resolved_options();

    Reflect::get(&intl, &JsValue::from_str("timeZone"))

        .ok()

        .and_then(|tz| tz.as_string())

        .ok_or(crate::GetTimezoneError::OsError)

}

#[cfg(test)]

mod tests {

    use wasm_bindgen_test::*;

    #[wasm_bindgen_test]

    fn pass() {

        let tz = super::get_timezone_inner().unwrap();

        console_log!("tz={:?}", tz);

    }

}