/*
 * Copyright (C) 2020 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.statusbar.connectivity

import android.content.Context
import android.os.UserHandle
import android.os.UserManager
import android.platform.test.annotations.DisableFlags
import android.platform.test.annotations.EnableFlags
import android.testing.TestableLooper.RunWithLooper
import androidx.lifecycle.Lifecycle
import androidx.test.ext.junit.runners.AndroidJUnit4
import androidx.test.filters.SmallTest
import com.android.systemui.Flags.FLAG_MULTIUSER_WIFI_PICKER_TRACKER_SUPPORT
import com.android.systemui.SysuiTestCase
import com.android.systemui.settings.UserTracker
import com.android.systemui.util.mockito.capture
import com.android.wifitrackerlib.WifiEntry
import com.android.wifitrackerlib.WifiPickerTracker
import com.google.common.truth.Truth.assertThat
import java.util.concurrent.Executor
import org.junit.Before
import org.junit.Test
import org.junit.runner.RunWith
import org.mockito.ArgumentCaptor
import org.mockito.ArgumentMatchers.anyList
import org.mockito.Captor
import org.mockito.Mock
import org.mockito.Mockito.never
import org.mockito.Mockito.times
import org.mockito.Mockito.verify
import org.mockito.Mockito.`when`
import org.mockito.MockitoAnnotations
import org.mockito.kotlin.any
import org.mockito.kotlin.mock

@SmallTest
@RunWith(AndroidJUnit4::class)
@RunWithLooper(setAsMainLooper = true)
class AccessPointControllerImplTest : SysuiTestCase() {

    @Mock private lateinit var userManager: UserManager
    @Mock private lateinit var userTracker: UserTracker
    @Mock private lateinit var wifiPickerTrackerFactory: WifiPickerTrackerFactory
    @Mock private lateinit var wifiPickerTracker: WifiPickerTracker
    @Mock private lateinit var callback: AccessPointController.AccessPointCallback
    @Mock private lateinit var otherCallback: AccessPointController.AccessPointCallback
    @Mock private lateinit var wifiEntryConnected: WifiEntry
    @Mock private lateinit var wifiEntryOther: WifiEntry
    @Captor private lateinit var wifiEntryListCaptor: ArgumentCaptor<List<WifiEntry>>

    private val instantExecutor = Executor { it.run() }
    private lateinit var controller: AccessPointControllerImpl

    @Before
    fun setUp() {
        MockitoAnnotations.initMocks(this)
        `when`(wifiPickerTrackerFactory.create(any(), any(), any(), any()))
            .thenReturn(wifiPickerTracker)

        `when`(wifiPickerTracker.connectedWifiEntry).thenReturn(wifiEntryConnected)
        `when`(wifiPickerTracker.wifiEntries)
            .thenReturn(ArrayList<WifiEntry>().apply { add(wifiEntryOther) })

        controller =
            AccessPointControllerImpl(
                mContext,
                userManager,
                userTracker,
                instantExecutor,
                wifiPickerTrackerFactory,
            )

        controller.init()
    }

    @Test
    fun testInitialLifecycleStateCreated() {
        assertThat(controller.lifecycle.currentState).isEqualTo(Lifecycle.State.CREATED)
    }

    @Test
    fun testLifecycleStartedAfterFirstCallback() {
        controller.addAccessPointCallback(callback)
        assertThat(controller.lifecycle.currentState).isEqualTo(Lifecycle.State.STARTED)
    }

    @Test
    fun testLifecycleBackToCreatedAfterRemovingOnlyCallback() {
        controller.addAccessPointCallback(callback)
        controller.removeAccessPointCallback(callback)

        assertThat(controller.lifecycle.currentState).isEqualTo(Lifecycle.State.CREATED)
    }

    @Test
    fun testLifecycleStillStartedAfterRemovingSecondCallback() {
        controller.addAccessPointCallback(callback)
        controller.addAccessPointCallback(otherCallback)
        controller.removeAccessPointCallback(callback)

        assertThat(controller.lifecycle.currentState).isEqualTo(Lifecycle.State.STARTED)
    }

    @Test
    fun testScanForAccessPointsTriggersCallbackWithEntriesInOrder() {
        controller.addAccessPointCallback(callback)
        controller.scanForAccessPoints()

        verify(callback).onAccessPointsChanged(capture(wifiEntryListCaptor))

        assertThat(wifiEntryListCaptor.value).containsExactly(wifiEntryConnected, wifiEntryOther)
    }

    @Test
    fun testOnWifiStateChangedTriggersCallbackWithEntriesInOrder() {
        controller.addAccessPointCallback(callback)
        controller.onWifiStateChanged()

        verify(callback).onAccessPointsChanged(capture(wifiEntryListCaptor))

        assertThat(wifiEntryListCaptor.value).containsExactly(wifiEntryConnected, wifiEntryOther)
    }

    @Test
    fun testOnWifiEntriesChangedTriggersCallbackWithEntriesInOrder() {
        controller.addAccessPointCallback(callback)
        controller.onWifiEntriesChanged()

        verify(callback).onAccessPointsChanged(capture(wifiEntryListCaptor))

        assertThat(wifiEntryListCaptor.value).containsExactly(wifiEntryConnected, wifiEntryOther)
    }

    @Test
    fun onWifiEntriesChanged_reasonIsScanResults_fireWifiScanCallbackFalse() {
        controller.addAccessPointCallback(callback)

        controller.onWifiEntriesChanged(WifiPickerTracker.WIFI_ENTRIES_CHANGED_REASON_SCAN_RESULTS)

        verify(callback).onWifiScan(false)
    }

    @Test
    fun onScanRequested_fireWifiScanCallbackTrue() {
        controller.addAccessPointCallback(callback)

        controller.onScanRequested()

        verify(callback).onWifiScan(true)
    }

    @Test
    fun testOnNumSavedNetworksChangedDoesntTriggerCallback() {
        controller.addAccessPointCallback(callback)
        controller.onNumSavedNetworksChanged()

        verify(callback, never()).onAccessPointsChanged(anyList())
    }

    @Test
    fun testOnNumSavedSubscriptionsChangedDoesntTriggerCallback() {
        controller.addAccessPointCallback(callback)
        controller.onNumSavedSubscriptionsChanged()

        verify(callback, never()).onAccessPointsChanged(anyList())
    }

    @Test
    fun testReturnEmptyListWhenNoWifiPickerTracker() {
        `when`(wifiPickerTrackerFactory.create(any(), any(), any(), any())).thenReturn(null)
        val otherController =
            AccessPointControllerImpl(
                mContext,
                userManager,
                userTracker,
                instantExecutor,
                wifiPickerTrackerFactory,
            )
        otherController.init()

        otherController.addAccessPointCallback(callback)
        otherController.scanForAccessPoints()

        verify(callback).onAccessPointsChanged(capture(wifiEntryListCaptor))

        assertThat(wifiEntryListCaptor.value).isEmpty()
    }

    @Test
    fun connectToNullEntry() {
        controller.addAccessPointCallback(callback)

        assertThat(controller.connect(null)).isFalse()

        verify(callback, never()).onSettingsActivityTriggered(any())
    }

    @Test
    fun connectToSavedWifiEntry() {
        controller.addAccessPointCallback(callback)
        `when`(wifiEntryOther.isSaved).thenReturn(true)

        assertThat(controller.connect(wifiEntryOther)).isFalse()

        verify(wifiEntryOther).connect(any())
        verify(callback, never()).onSettingsActivityTriggered(any())
    }

    @Test
    fun connectToSecuredNotSavedWifiEntry() {
        controller.addAccessPointCallback(callback)
        `when`(wifiEntryOther.isSaved).thenReturn(false)
        `when`(wifiEntryOther.security).thenReturn(WifiEntry.SECURITY_EAP)

        // True means we will launch WifiSettings
        assertThat(controller.connect(wifiEntryOther)).isTrue()

        verify(wifiEntryOther, never()).connect(any())
        verify(callback).onSettingsActivityTriggered(any())
    }

    @Test
    fun connectToNotSecuredNotSavedWifiEntry() {
        controller.addAccessPointCallback(callback)
        `when`(wifiEntryOther.isSaved).thenReturn(false)
        `when`(wifiEntryOther.security).thenReturn(WifiEntry.SECURITY_NONE)

        assertThat(controller.connect(wifiEntryOther)).isFalse()

        verify(wifiEntryOther).connect(any())
        verify(callback, never()).onSettingsActivityTriggered(any())
    }

    @Test
    @EnableFlags(FLAG_MULTIUSER_WIFI_PICKER_TRACKER_SUPPORT)
    fun switchUsers() {
        val primaryUserMockContext = mock<Context>()
        mContext.prepareCreateContextAsUser(UserHandle.of(PRIMARY_USER_ID), primaryUserMockContext)
        controller.onUserSwitched(PRIMARY_USER_ID)

        // Create is expected to be called once when the test starts and a second time when the user
        // is switched. The first WifiPickerTracker should have its onStop() method called prior to
        // the new WifiPickerTracker being created.
        verify(wifiPickerTrackerFactory, times(2)).create(any(), any(), any(), any())
        verify(wifiPickerTracker).onStop()
    }

    @Test
    @DisableFlags(FLAG_MULTIUSER_WIFI_PICKER_TRACKER_SUPPORT)
    fun switchUsers_flagDisabled() {
        val primaryUserMockContext = mock<Context>()
        mContext.prepareCreateContextAsUser(UserHandle.of(PRIMARY_USER_ID), primaryUserMockContext)
        controller.onUserSwitched(PRIMARY_USER_ID)

        // Create is expected to only be called once when the test starts, switching users should
        // have no effects.
        verify(wifiPickerTrackerFactory, times(1)).create(any(), any(), any(), any())
        verify(wifiPickerTracker, never()).onStop()
    }

    private companion object {
        private const val PRIMARY_USER_ID = 1
    }
}