/*
 * Copyright (C) 2019 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.color;

import static com.google.common.truth.Truth.assertWithMessage;

import androidx.test.InstrumentationRegistry;

import java.lang.System;
import java.util.Arrays;

import org.junit.Before;
import org.junit.Test;

public class DisplayWhiteBalanceTintControllerTest {

    private DisplayWhiteBalanceTintController mDisplayWhiteBalanceTintController;

    @Before
    public void setUp() {
        mDisplayWhiteBalanceTintController = new DisplayWhiteBalanceTintController();
        mDisplayWhiteBalanceTintController.setUp(InstrumentationRegistry.getContext(), true);
        mDisplayWhiteBalanceTintController.setActivated(true);
    }

    @Test
    public void displayWhiteBalance_setTemperatureOverMax() {
        final int max = mDisplayWhiteBalanceTintController.mTemperatureMax;
        mDisplayWhiteBalanceTintController.setMatrix(max + 1);
        assertWithMessage("Unexpected temperature set")
                .that(mDisplayWhiteBalanceTintController.mCurrentColorTemperature)
                .isEqualTo(max);
    }

    @Test
    public void displayWhiteBalance_setTemperatureBelowMin() {
        final int min = mDisplayWhiteBalanceTintController.mTemperatureMin;
        mDisplayWhiteBalanceTintController.setMatrix(min - 1);
        assertWithMessage("Unexpected temperature set")
                .that(mDisplayWhiteBalanceTintController.mCurrentColorTemperature)
                .isEqualTo(min);
    }

    @Test
    public void displayWhiteBalance_setValidTemperature() {
        final int colorTemperature = (mDisplayWhiteBalanceTintController.mTemperatureMin
                + mDisplayWhiteBalanceTintController.mTemperatureMax) / 2;
        mDisplayWhiteBalanceTintController.setMatrix(colorTemperature);

        assertWithMessage("Unexpected temperature set")
                .that(mDisplayWhiteBalanceTintController.mCurrentColorTemperature)
                .isEqualTo(colorTemperature);
    }

    @Test
    public void displayWhiteBalance_setMatrixValidDwbCalculation() {
        float[] currentMatrix = mDisplayWhiteBalanceTintController.getMatrix();
        float[] oldMatrix = Arrays.copyOf(currentMatrix, currentMatrix.length);

        mDisplayWhiteBalanceTintController
                .setMatrix(mDisplayWhiteBalanceTintController.mCurrentColorTemperature + 1);
        assertWithMessage("DWB matrix did not change when setting a new temperature")
                .that(Arrays.equals(oldMatrix, currentMatrix))
                .isFalse();
    }

    @Test
    public void displayWhiteBalance_setMatrixInvalidDwbCalculation() {
        Arrays.fill(mDisplayWhiteBalanceTintController.mDisplayNominalWhiteXYZ, 0);
        mDisplayWhiteBalanceTintController
            .setMatrix(mDisplayWhiteBalanceTintController.mCurrentColorTemperature + 1);
        assertWithMessage("DWB matrix not set to identity after an invalid DWB calculation")
                .that(Arrays.equals(mDisplayWhiteBalanceTintController.getMatrix(),
                    new float[] {
                        1, 0, 0, 0,
                        0, 1, 0, 0,
                        0, 0, 1, 0,
                        0, 0, 0, 1
                    })
                ).isTrue();
    }
}
