/*
 * Copyright (C) 2022 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.systemui.flags

import androidx.test.ext.junit.runners.AndroidJUnit4
import androidx.test.filters.SmallTest
import com.android.systemui.SysuiTestCase
import com.android.systemui.util.DeviceConfigProxyFake
import com.android.systemui.util.concurrency.FakeExecutor
import com.android.systemui.util.mockito.any
import com.android.systemui.util.time.FakeSystemClock
import org.junit.Before
import org.junit.Test
import org.junit.runner.RunWith
import org.mockito.Mock
import org.mockito.Mockito.anyString
import org.mockito.Mockito.never
import org.mockito.Mockito.verify
import org.mockito.MockitoAnnotations

@SmallTest
@RunWith(AndroidJUnit4::class)
class ServerFlagReaderImplTest : SysuiTestCase() {

    private val NAMESPACE = "test"

    @Mock private lateinit var changeListener: ServerFlagReader.ChangeListener

    private lateinit var serverFlagReader: ServerFlagReaderImpl
    private val deviceConfig = DeviceConfigProxyFake()
    private val executor = FakeExecutor(FakeSystemClock())

    @Before
    fun setup() {
        MockitoAnnotations.initMocks(this)

        serverFlagReader = ServerFlagReaderImpl(NAMESPACE, deviceConfig, executor, false)
    }

    @Test
    fun testChange_alertsListener() {
        val flag = ReleasedFlag("flag_1", "test")
        serverFlagReader.listenForChanges(listOf(flag), changeListener)

        deviceConfig.setProperty(NAMESPACE, "flag_1", "1", false)
        executor.runAllReady()

        verify(changeListener).onChange(flag, "1")
    }

    @Test
    fun testChange_ignoresListenersDuringTest() {
        val serverFlagReader = ServerFlagReaderImpl(NAMESPACE, deviceConfig, executor, true)
        val flag = ReleasedFlag("1", "   test")
        serverFlagReader.listenForChanges(listOf(flag), changeListener)

        deviceConfig.setProperty(NAMESPACE, "flag_override_1", "1", false)
        executor.runAllReady()

        verify(changeListener, never()).onChange(any(), anyString())
    }
}