package be.mygod.vpnhotspot.net

import android.provider.Settings
import androidx.annotation.RequiresApi
import be.mygod.vpnhotspot.App.Companion.app
import be.mygod.vpnhotspot.root.RootManager
import be.mygod.vpnhotspot.root.SettingsGlobalPut
import be.mygod.vpnhotspot.util.Services

/**
 * It's hard to change tethering rules with Tethering hardware acceleration enabled for now.
 *
 * See also:
 *   android.provider.Settings.Global.TETHER_OFFLOAD_DISABLED
 *   https://android.googlesource.com/platform/frameworks/base/+/android-8.1.0_r1/services/core/java/com/android/server/connectivity/tethering/OffloadHardwareInterface.java#45
 *   https://android.googlesource.com/platform/hardware/qcom/data/ipacfg-mgr/+/master/msm8998/ipacm/src/IPACM_OffloadManager.cpp
 */
@RequiresApi(27)
object TetherOffloadManager {
    private const val TETHER_OFFLOAD_DISABLED = "tether_offload_disabled"
    val enabled get() = Settings.Global.getInt(app.contentResolver, TETHER_OFFLOAD_DISABLED, 0) == 0
    suspend fun setEnabled(value: Boolean) {
        val int = if (value) 0 else 1
        try {
            check(Settings.Global.putInt(Services.context.contentResolver, TETHER_OFFLOAD_DISABLED, int))
        } catch (e: SecurityException) {
            try {
                RootManager.use { it.execute(SettingsGlobalPut(TETHER_OFFLOAD_DISABLED, int.toString())) }
            } catch (eRoot: Exception) {
                eRoot.addSuppressed(e)
                throw eRoot
            }
        }
    }
}