/*
 * Copyright (C) 2023 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.server

import android.content.Intent
import android.net.ConnectivityManager.ACTION_RESTRICT_BACKGROUND_CHANGED
import android.net.ConnectivityManager.RESTRICT_BACKGROUND_STATUS_DISABLED
import android.net.ConnectivityManager.RESTRICT_BACKGROUND_STATUS_ENABLED
import android.net.ConnectivityManager.RESTRICT_BACKGROUND_STATUS_WHITELISTED
import android.os.Build
import androidx.test.filters.SmallTest
import com.android.testutils.DevSdkIgnoreRule
import com.android.testutils.DevSdkIgnoreRule.IgnoreAfter
import com.android.testutils.DevSdkIgnoreRule.IgnoreUpTo
import com.android.testutils.DevSdkIgnoreRunner
import com.android.testutils.visibleOnHandlerThread
import org.junit.Rule
import org.junit.Test
import org.junit.runner.RunWith
import org.mockito.ArgumentMatchers.anyBoolean
import org.mockito.ArgumentMatchers.anyInt
import org.mockito.Mockito.doReturn
import org.mockito.Mockito.inOrder
import org.mockito.Mockito.never
import org.mockito.Mockito.verify

@DevSdkIgnoreRunner.MonitorThreadLeak
@RunWith(DevSdkIgnoreRunner::class)
@SmallTest
@IgnoreUpTo(Build.VERSION_CODES.S_V2) // Bpf only supports in T+.
class CSBpfNetMapsTest : CSTest() {
    @get:Rule
    val ignoreRule = DevSdkIgnoreRule()

    @IgnoreAfter(Build.VERSION_CODES.UPSIDE_DOWN_CAKE)
    @Test
    fun testCSTrackDataSaverBeforeV() {
        val inOrder = inOrder(bpfNetMaps)
        mockDataSaverStatus(RESTRICT_BACKGROUND_STATUS_WHITELISTED)
        inOrder.verify(bpfNetMaps).setDataSaverEnabled(true)
        mockDataSaverStatus(RESTRICT_BACKGROUND_STATUS_DISABLED)
        inOrder.verify(bpfNetMaps).setDataSaverEnabled(false)
        mockDataSaverStatus(RESTRICT_BACKGROUND_STATUS_ENABLED)
        inOrder.verify(bpfNetMaps).setDataSaverEnabled(true)
    }

    // Data Saver Status is updated from platform code in V+.
    @IgnoreUpTo(Build.VERSION_CODES.UPSIDE_DOWN_CAKE)
    @Test
    fun testCSTrackDataSaverAboveU() {
        listOf(RESTRICT_BACKGROUND_STATUS_WHITELISTED, RESTRICT_BACKGROUND_STATUS_ENABLED,
            RESTRICT_BACKGROUND_STATUS_DISABLED).forEach {
            mockDataSaverStatus(it)
            verify(bpfNetMaps, never()).setDataSaverEnabled(anyBoolean())
        }
    }

    private fun mockDataSaverStatus(status: Int) {
        doReturn(status).`when`(context.networkPolicyManager).getRestrictBackgroundStatus(anyInt())
        // While the production code dispatches the intent on the handler thread,
        // The test would dispatch the intent in the caller thread. Make it dispatch
        // on the handler thread to match production behavior.
        visibleOnHandlerThread(csHandler) {
            context.sendBroadcast(Intent(ACTION_RESTRICT_BACKGROUND_CHANGED))
        }
        waitForIdle()
    }
}