/*
 * Nextcloud Android client application
 *
 * @author Chris Narkiewicz
 *
 * Copyright (C) 2019 Chris Narkiewicz <hello@ezaquarii.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <https://www.gnu.org/licenses/>.
 */

package com.nextcloud.client.device

import android.content.Context
import android.content.Intent
import android.os.BatteryManager
import android.os.Build
import android.os.PowerManager
import com.nextcloud.client.preferences.AppPreferences
import com.nhaarman.mockitokotlin2.any
import com.nhaarman.mockitokotlin2.anyOrNull
import com.nhaarman.mockitokotlin2.eq
import com.nhaarman.mockitokotlin2.mock
import com.nhaarman.mockitokotlin2.never
import com.nhaarman.mockitokotlin2.verify
import com.nhaarman.mockitokotlin2.whenever
import org.junit.Assert.assertFalse
import org.junit.Assert.assertTrue
import org.junit.Before
import org.junit.Test
import org.junit.runner.RunWith
import org.junit.runners.Suite
import org.mockito.Mock
import org.mockito.MockitoAnnotations

@RunWith(Suite::class)
@Suite.SuiteClasses(
    TestPowerManagementService.PowerSaveMode::class,
    TestPowerManagementService.BatteryCharging::class
)
class TestPowerManagementService {

    abstract class Base {
        @Mock
        lateinit var context: Context

        @Mock
        lateinit var platformPowerManager: PowerManager

        @Mock
        lateinit var deviceInfo: DeviceInfo

        internal lateinit var powerManagementService: PowerManagementServiceImpl

        @Mock
        lateinit var preferences: AppPreferences

        @Before
        fun setUpBase() {
            MockitoAnnotations.initMocks(this)
            powerManagementService = PowerManagementServiceImpl(
                context,
                platformPowerManager,
                preferences,
                deviceInfo
            )
        }
    }

    class PowerSaveMode : Base() {

        @Test
        fun `power saving queries power manager on API 21+`() {
            // GIVEN
            //      API level >= 21
            //      power save mode is on
            whenever(deviceInfo.apiLevel).thenReturn(Build.VERSION_CODES.LOLLIPOP)
            whenever(platformPowerManager.isPowerSaveMode).thenReturn(true)

            // WHEN
            //      power save mode is checked
            // THEN
            //      power save mode is enabled
            //      state is obtained from platform power manager
            assertTrue(powerManagementService.isPowerSavingEnabled)
            verify(platformPowerManager).isPowerSaveMode
        }

        @Test
        fun `power saving is not available below API 21`() {
            // GIVEN
            //      API level <21
            whenever(deviceInfo.apiLevel).thenReturn(Build.VERSION_CODES.KITKAT)

            // WHEN
            //      power save mode is checked

            // THEN
            //      power save mode is disabled
            //      power manager is not queried
            assertFalse(powerManagementService.isPowerSavingEnabled)
            verify(platformPowerManager, never()).isPowerSaveMode
        }

        @Test
        fun `power save exclusion is available for flagged vendors`() {
            for (vendor in PowerManagementServiceImpl.OVERLY_AGGRESSIVE_POWER_SAVING_VENDORS) {
                whenever(deviceInfo.vendor).thenReturn(vendor)
                assertTrue("Vendor $vendor check failed", powerManagementService.isPowerSavingExclusionAvailable)
            }
        }

        @Test
        fun `power save exclusion is not available for other vendors`() {
            whenever(deviceInfo.vendor).thenReturn("some_other_nice_vendor")
            assertFalse(powerManagementService.isPowerSavingExclusionAvailable)
        }

        @Test
        fun `power saving check is disabled`() {
            // GIVEN
            //      a device which falsely returns power save mode enabled
            //      power check is overridden by user
            whenever(preferences.isPowerCheckDisabled).thenReturn(true)
            whenever(platformPowerManager.isPowerSaveMode).thenReturn(true)

            // WHEN
            //      power save mode is checked
            // THEN
            //      power saving is disabled
            assertFalse(powerManagementService.isPowerSavingEnabled)
        }
    }

    class BatteryCharging : Base() {

        val mockStickyBatteryStatusIntent: Intent = mock()

        @Before
        fun setUp() {
            whenever(context.registerReceiver(anyOrNull(), anyOrNull())).thenReturn(mockStickyBatteryStatusIntent)
        }

        @Test
        fun `battery charging status on API 17+`() {
            // GIVEN
            //      device has API level 17+
            //      battery status sticky intent is available
            whenever(deviceInfo.apiLevel).thenReturn(Build.VERSION_CODES.JELLY_BEAN_MR1)
            val powerSources = setOf(
                BatteryManager.BATTERY_PLUGGED_AC,
                BatteryManager.BATTERY_PLUGGED_USB,
                BatteryManager.BATTERY_PLUGGED_WIRELESS
            )

            for (row in powerSources) {
                // WHEN
                //      device is charging using supported power source
                whenever(mockStickyBatteryStatusIntent.getIntExtra(eq(BatteryManager.EXTRA_PLUGGED), any()))
                    .thenReturn(row)

                // THEN
                //      charging flag is true
                assertTrue(powerManagementService.isBatteryCharging)
            }
        }

        @Test
        fun `battery charging status on API 16`() {
            // GIVEN
            //      device has API level 16
            //      battery status sticky intent is available
            whenever(deviceInfo.apiLevel).thenReturn(Build.VERSION_CODES.JELLY_BEAN)
            val powerSources = setOf(
                BatteryManager.BATTERY_PLUGGED_AC,
                BatteryManager.BATTERY_PLUGGED_USB
            )

            for (row in powerSources) {
                // WHEN
                //      device is charging using AC or USB
                whenever(mockStickyBatteryStatusIntent.getIntExtra(eq(BatteryManager.EXTRA_PLUGGED), any()))
                    .thenReturn(row)

                // THEN
                //      charging flag is true
                assertTrue(powerManagementService.isBatteryCharging)
            }
        }

        @Test
        fun `wireless charging is not supported in API 16`() {
            // GIVEN
            //      device has API level 16
            //      battery status sticky intent is available
            whenever(deviceInfo.apiLevel).thenReturn(Build.VERSION_CODES.JELLY_BEAN)

            // WHEN
            //      spurious wireless power source is returned
            whenever(mockStickyBatteryStatusIntent.getIntExtra(eq(BatteryManager.EXTRA_PLUGGED), any()))
                .thenReturn(BatteryManager.BATTERY_PLUGGED_WIRELESS)

            // THEN
            //      power source value is ignored on this API level
            //      charging flag is false
            assertFalse(powerManagementService.isBatteryCharging)
        }

        @Test
        fun `battery status sticky intent is not available`() {
            // GIVEN
            //      device has API level P or below
            //      battery status sticky intent is NOT available
            whenever(deviceInfo.apiLevel).thenReturn(Build.VERSION_CODES.P)
            whenever(context.registerReceiver(anyOrNull(), anyOrNull())).thenReturn(null)

            // THEN
            //     charging flag is false
            assertFalse(powerManagementService.isBatteryCharging)
            verify(context).registerReceiver(anyOrNull(), any())
        }
    }
}