/*
 * Copyright (C) 2017 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.display;

import static com.android.server.display.VirtualDisplayAdapter.UNIQUE_ID_PREFIX;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

import android.content.Context;
import android.hardware.display.BrightnessConfiguration;
import android.hardware.display.Curve;
import android.hardware.display.DisplayManager;
import android.hardware.display.DisplayViewport;
import android.hardware.display.DisplayedContentSample;
import android.hardware.display.DisplayedContentSamplingAttributes;
import android.hardware.display.IVirtualDisplayCallback;
import android.hardware.input.InputManagerInternal;
import android.os.Handler;
import android.os.IBinder;
import android.view.Display;
import android.view.DisplayInfo;
import android.view.SurfaceControl;

import androidx.test.InstrumentationRegistry;
import androidx.test.filters.SmallTest;
import androidx.test.runner.AndroidJUnit4;

import com.android.server.LocalServices;
import com.android.server.SystemService;
import com.android.server.display.DisplayDeviceInfo;
import com.android.server.display.DisplayManagerService.SyncRoot;
import com.android.server.lights.LightsManager;
import com.android.server.wm.WindowManagerInternal;

import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.ArgumentCaptor;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;

import java.util.List;
import java.util.stream.LongStream;

@SmallTest
@RunWith(AndroidJUnit4.class)
public class DisplayManagerServiceTest {
    private static final int MSG_REGISTER_DEFAULT_DISPLAY_ADAPTERS = 1;
    private static final long SHORT_DEFAULT_DISPLAY_TIMEOUT_MILLIS = 10;

    private Context mContext;

    private final DisplayManagerService.Injector mShortMockedInjector =
            new DisplayManagerService.Injector() {
                @Override
                VirtualDisplayAdapter getVirtualDisplayAdapter(SyncRoot syncRoot,
                        Context context, Handler handler, DisplayAdapter.Listener listener) {
                    return mMockVirtualDisplayAdapter;
                }

                @Override
                long getDefaultDisplayDelayTimeout() {
                    return SHORT_DEFAULT_DISPLAY_TIMEOUT_MILLIS;
                }
            };
    private final DisplayManagerService.Injector mBasicInjector =
            new DisplayManagerService.Injector() {
                @Override
                VirtualDisplayAdapter getVirtualDisplayAdapter(SyncRoot syncRoot,
                        Context context, Handler handler,
                        DisplayAdapter.Listener displayAdapterListener) {
                    return new VirtualDisplayAdapter(syncRoot, context, handler,
                            displayAdapterListener,
                            (String name, boolean secure) -> mMockDisplayToken);
                }
            };

    @Mock InputManagerInternal mMockInputManagerInternal;
    @Mock IVirtualDisplayCallback.Stub mMockAppToken;
    @Mock WindowManagerInternal mMockWindowManagerInternal;
    @Mock LightsManager mMockLightsManager;
    @Mock VirtualDisplayAdapter mMockVirtualDisplayAdapter;
    @Mock IBinder mMockDisplayToken;

    @Before
    public void setUp() throws Exception {
        MockitoAnnotations.initMocks(this);

        LocalServices.removeServiceForTest(InputManagerInternal.class);
        LocalServices.addService(InputManagerInternal.class, mMockInputManagerInternal);
        LocalServices.removeServiceForTest(WindowManagerInternal.class);
        LocalServices.addService(WindowManagerInternal.class, mMockWindowManagerInternal);
        LocalServices.removeServiceForTest(LightsManager.class);
        LocalServices.addService(LightsManager.class, mMockLightsManager);

        mContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
    }

    @Test
    public void testCreateVirtualDisplay_sentToInputManager() {
        DisplayManagerService displayManager =
                new DisplayManagerService(mContext, mBasicInjector);
        registerDefaultDisplays(displayManager);
        displayManager.systemReady(false /* safeMode */, true /* onlyCore */);
        displayManager.windowManagerAndInputReady();

        // This is effectively the DisplayManager service published to ServiceManager.
        DisplayManagerService.BinderService bs = displayManager.new BinderService();

        String uniqueId = "uniqueId --- Test";
        String uniqueIdPrefix = UNIQUE_ID_PREFIX + mContext.getPackageName() + ":";
        int width = 600;
        int height = 800;
        int dpi = 320;
        int flags = DisplayManager.VIRTUAL_DISPLAY_FLAG_SUPPORTS_TOUCH;

        when(mMockAppToken.asBinder()).thenReturn(mMockAppToken);
        int displayId = bs.createVirtualDisplay(mMockAppToken /* callback */,
                null /* projection */, "com.android.frameworks.servicestests",
                "Test Virtual Display", width, height, dpi, null /* surface */, flags /* flags */,
                uniqueId);

        displayManager.performTraversalInternal(mock(SurfaceControl.Transaction.class));

        // flush the handler
        displayManager.getDisplayHandler().runWithScissors(() -> {}, 0 /* now */);

        ArgumentCaptor<List<DisplayViewport>> viewportCaptor = ArgumentCaptor.forClass(List.class);
        verify(mMockInputManagerInternal).setDisplayViewports(viewportCaptor.capture());
        List<DisplayViewport> viewports = viewportCaptor.getValue();

        // Expect to receive 2 viewports: internal, and virtual
        assertEquals(2, viewports.size());

        DisplayViewport virtualViewport = null;
        DisplayViewport internalViewport = null;
        for (int i = 0; i < viewports.size(); i++) {
            DisplayViewport v = viewports.get(i);
            switch (v.type) {
                case DisplayViewport.VIEWPORT_INTERNAL: {
                    internalViewport = v;
                    break;
                }
                case DisplayViewport.VIEWPORT_EXTERNAL: {
                    fail("EXTERNAL viewport should not exist.");
                    break;
                }
                case DisplayViewport.VIEWPORT_VIRTUAL: {
                    virtualViewport = v;
                    break;
                }
            }
        }
        // INTERNAL viewport gets created upon access.
        assertNotNull(internalViewport);
        assertNotNull(virtualViewport);

        // INTERNAL
        assertTrue(internalViewport.valid);

        // VIRTUAL
        assertEquals(height, virtualViewport.deviceHeight);
        assertEquals(width, virtualViewport.deviceWidth);
        assertEquals(uniqueIdPrefix + uniqueId, virtualViewport.uniqueId);
        assertEquals(displayId, virtualViewport.displayId);
    }

    @Test
    public void testPhysicalViewports() {
        DisplayManagerService displayManager =
                new DisplayManagerService(mContext, mBasicInjector);
        registerDefaultDisplays(displayManager);
        displayManager.systemReady(false /* safeMode */, true /* onlyCore */);
        displayManager.windowManagerAndInputReady();

        // This is effectively the DisplayManager service published to ServiceManager.
        DisplayManagerService.BinderService bs = displayManager.new BinderService();

        when(mMockAppToken.asBinder()).thenReturn(mMockAppToken);

        final int displayIds[] = bs.getDisplayIds();
        assertEquals(1, displayIds.length);
        final int displayId = displayIds[0];
        DisplayInfo info = bs.getDisplayInfo(displayId);
        assertEquals(info.type, Display.TYPE_BUILT_IN);

        displayManager.performTraversalInternal(mock(SurfaceControl.Transaction.class));

        // flush the handler
        displayManager.getDisplayHandler().runWithScissors(() -> {}, 0 /* now */);

        ArgumentCaptor<List<DisplayViewport>> viewportCaptor = ArgumentCaptor.forClass(List.class);
        verify(mMockInputManagerInternal).setDisplayViewports(viewportCaptor.capture());
        List<DisplayViewport> viewports = viewportCaptor.getValue();

        // Expect to receive actual viewports: 1 internal
        assertEquals(1, viewports.size());

        DisplayViewport internalViewport = viewports.get(0);

        // INTERNAL is the only one actual display.
        assertNotNull(internalViewport);
        assertEquals(DisplayViewport.VIEWPORT_INTERNAL, internalViewport.type);
        assertTrue(internalViewport.valid);
        assertEquals(displayId, internalViewport.displayId);
    }

    @Test
    public void testCreateVirtualDisplayRotatesWithContent() throws Exception {
        DisplayManagerService displayManager =
                new DisplayManagerService(mContext, mBasicInjector);
        registerDefaultDisplays(displayManager);

        // This is effectively the DisplayManager service published to ServiceManager.
        DisplayManagerService.BinderService bs = displayManager.new BinderService();

        String uniqueId = "uniqueId --- Rotates With Content Test";
        int width = 600;
        int height = 800;
        int dpi = 320;
        int flags = DisplayManager.VIRTUAL_DISPLAY_FLAG_ROTATES_WITH_CONTENT;

        when(mMockAppToken.asBinder()).thenReturn(mMockAppToken);
        int displayId = bs.createVirtualDisplay(mMockAppToken /* callback */,
                null /* projection */, "com.android.frameworks.servicestests",
                "Test Virtual Display", width, height, dpi, null /* surface */, flags /* flags */,
                uniqueId);

        displayManager.performTraversalInternal(mock(SurfaceControl.Transaction.class));

        // flush the handler
        displayManager.getDisplayHandler().runWithScissors(() -> {}, 0 /* now */);

        DisplayDeviceInfo ddi = displayManager.getDisplayDeviceInfoInternal(displayId);
        assertNotNull(ddi);
        assertTrue((ddi.flags & DisplayDeviceInfo.FLAG_ROTATES_WITH_CONTENT) != 0);
    }

    /**
     * Tests that the virtual display is created along-side the default display.
     */
    @Test
    public void testStartVirtualDisplayWithDefaultDisplay_Succeeds() throws Exception {
        DisplayManagerService displayManager =
                new DisplayManagerService(mContext, mShortMockedInjector);
        registerDefaultDisplays(displayManager);
        displayManager.onBootPhase(SystemService.PHASE_WAIT_FOR_DEFAULT_DISPLAY);
    }

    /**
     * Tests that we get a Runtime exception when we cannot initialize the default display.
     */
    @Test
    public void testStartVirtualDisplayWithDefDisplay_NoDefaultDisplay() throws Exception {
        DisplayManagerService displayManager =
                new DisplayManagerService(mContext, mShortMockedInjector);
        Handler handler = displayManager.getDisplayHandler();
        handler.runWithScissors(() -> {}, 0 /* now */);

        try {
            displayManager.onBootPhase(SystemService.PHASE_WAIT_FOR_DEFAULT_DISPLAY);
        } catch (RuntimeException e) {
            return;
        }
        fail("Expected DisplayManager to throw RuntimeException when it cannot initialize the"
                + " default display");
    }

    /**
     * Tests that we get a Runtime exception when we cannot initialize the virtual display.
     */
    @Test
    public void testStartVirtualDisplayWithDefDisplay_NoVirtualDisplayAdapter() throws Exception {
        DisplayManagerService displayManager = new DisplayManagerService(mContext,
                new DisplayManagerService.Injector() {
                    @Override
                    VirtualDisplayAdapter getVirtualDisplayAdapter(SyncRoot syncRoot,
                            Context context, Handler handler, DisplayAdapter.Listener listener) {
                        return null;  // return null for the adapter.  This should cause a failure.
                    }

                    @Override
                    long getDefaultDisplayDelayTimeout() {
                        return SHORT_DEFAULT_DISPLAY_TIMEOUT_MILLIS;
                    }
                });
        try {
            displayManager.onBootPhase(SystemService.PHASE_WAIT_FOR_DEFAULT_DISPLAY);
        } catch (RuntimeException e) {
            return;
        }
        fail("Expected DisplayManager to throw RuntimeException when it cannot initialize the"
                + " virtual display adapter");
    }

    /**
     * Tests that an exception is raised for too dark a brightness configuration.
     */
    @Test
    public void testTooDarkBrightnessConfigurationThrowException() {
        DisplayManagerService displayManager =
                new DisplayManagerService(mContext, mShortMockedInjector);
        Curve minimumBrightnessCurve = displayManager.getMinimumBrightnessCurveInternal();
        float[] lux = minimumBrightnessCurve.getX();
        float[] minimumNits = minimumBrightnessCurve.getY();
        float[] nits = new float[minimumNits.length];
        // For every control point, assert that making it slightly lower than the minimum throws an
        // exception.
        for (int i = 0; i < nits.length; i++) {
            for (int j = 0; j < nits.length; j++) {
                nits[j] = minimumNits[j];
                if (j == i) {
                    nits[j] -= 0.1f;
                }
                if (nits[j] < 0) {
                    nits[j] = 0;
                }
            }
            BrightnessConfiguration config =
                    new BrightnessConfiguration.Builder(lux, nits).build();
            Exception thrown = null;
            try {
                displayManager.validateBrightnessConfiguration(config);
            } catch (IllegalArgumentException e) {
                thrown = e;
            }
            assertNotNull("Building too dark a brightness configuration must throw an exception");
        }
    }

    /**
     * Tests that no exception is raised for not too dark a brightness configuration.
     */
    @Test
    public void testBrightEnoughBrightnessConfigurationDoesNotThrowException() {
        DisplayManagerService displayManager =
                new DisplayManagerService(mContext, mShortMockedInjector);
        Curve minimumBrightnessCurve = displayManager.getMinimumBrightnessCurveInternal();
        float[] lux = minimumBrightnessCurve.getX();
        float[] nits = minimumBrightnessCurve.getY();
        BrightnessConfiguration config = new BrightnessConfiguration.Builder(lux, nits).build();
        displayManager.validateBrightnessConfiguration(config);
    }

    /**
     * Tests that null brightness configurations are alright.
     */
    @Test
    public void testNullBrightnessConfiguration() {
        DisplayManagerService displayManager =
                new DisplayManagerService(mContext, mShortMockedInjector);
        displayManager.validateBrightnessConfiguration(null);
    }

    /**
     * Tests that collection of display color sampling results are sensible.
     */
    @Test
    public void testDisplayedContentSampling() {
        DisplayManagerService displayManager =
                new DisplayManagerService(mContext, mShortMockedInjector);
        registerDefaultDisplays(displayManager);

        DisplayDeviceInfo ddi = displayManager.getDisplayDeviceInfoInternal(0);
        assertNotNull(ddi);

        DisplayedContentSamplingAttributes attr =
                displayManager.getDisplayedContentSamplingAttributesInternal(0);
        if (attr == null) return; //sampling not supported on device, skip remainder of test.

        boolean enabled = displayManager.setDisplayedContentSamplingEnabledInternal(0, true, 0, 0);
        assertTrue(enabled);

        displayManager.setDisplayedContentSamplingEnabledInternal(0, false, 0, 0);
        DisplayedContentSample sample = displayManager.getDisplayedContentSampleInternal(0, 0, 0);
        assertNotNull(sample);

        long numPixels = ddi.width * ddi.height * sample.getNumFrames();
        long[] samples = sample.getSampleComponent(DisplayedContentSample.ColorComponent.CHANNEL0);
        assertTrue(samples.length == 0 || LongStream.of(samples).sum() == numPixels);

        samples = sample.getSampleComponent(DisplayedContentSample.ColorComponent.CHANNEL1);
        assertTrue(samples.length == 0 || LongStream.of(samples).sum() == numPixels);

        samples = sample.getSampleComponent(DisplayedContentSample.ColorComponent.CHANNEL2);
        assertTrue(samples.length == 0 || LongStream.of(samples).sum() == numPixels);

        samples = sample.getSampleComponent(DisplayedContentSample.ColorComponent.CHANNEL3);
        assertTrue(samples.length == 0 || LongStream.of(samples).sum() == numPixels);
    }

    private void registerDefaultDisplays(DisplayManagerService displayManager) {
        Handler handler = displayManager.getDisplayHandler();
        // Would prefer to call displayManager.onStart() directly here but it performs binderService
        // registration which triggers security exceptions when running from a test.
        handler.sendEmptyMessage(MSG_REGISTER_DEFAULT_DISPLAY_ADAPTERS);
        // flush the handler
        handler.runWithScissors(() -> {}, 0 /* now */);
    }
}