package com.ultron.jarvistv

import android.os.Handler
import android.os.Looper

/**
 * Dead-simple event bus so the ControlService can push status lines to the Jarvis screen
 * without holding an Activity reference. MainActivity subscribes while visible.
 */
object UiBus {
    private val main = Handler(Looper.getMainLooper())
    @Volatile private var listener: ((String) -> Unit)? = null

    fun subscribe(l: (String) -> Unit) { listener = l }
    fun unsubscribe() { listener = null }

    fun status(line: String) {
        main.post { listener?.invoke(line) }
    }
}