/*
 * Copyright (C) 2018 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.example.android.systemupdatersample;

import static org.junit.Assert.assertEquals;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.ArgumentMatchers.anyInt;
import static org.mockito.Mockito.doAnswer;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

import android.os.UpdateEngine;
import android.os.UpdateEngineCallback;
import android.support.test.filters.SmallTest;
import android.support.test.runner.AndroidJUnit4;

import com.example.android.systemupdatersample.util.PayloadSpecs;

import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mock;
import org.mockito.junit.MockitoJUnit;
import org.mockito.junit.MockitoRule;

import java.util.function.IntConsumer;

/**
 * Tests for {@link UpdateManager}
 */
@RunWith(AndroidJUnit4.class)
@SmallTest
public class UpdateManagerTest {

    @Rule
    public MockitoRule mockito = MockitoJUnit.rule();

    @Mock
    private UpdateEngine mUpdateEngine;
    @Mock
    private PayloadSpecs mPayloadSpecs;
    private UpdateManager mUpdateManager;

    @Before
    public void setUp() {
        mUpdateManager = new UpdateManager(mUpdateEngine, mPayloadSpecs);
    }

    @Test
    public void storesProgressThenInvokesCallbacks() {
        IntConsumer statusUpdateCallback = mock(IntConsumer.class);

        // When UpdateManager is bound to update_engine, it passes
        // UpdateManager.UpdateEngineCallbackImpl as a callback to update_engine.
        when(mUpdateEngine.bind(any(UpdateEngineCallback.class))).thenAnswer(answer -> {
            UpdateEngineCallback callback = answer.getArgument(0);
            callback.onStatusUpdate(/*engineStatus*/ 4, /*engineProgress*/ 0.2f);
            return null;
        });

        mUpdateManager.setOnEngineStatusUpdateCallback(statusUpdateCallback);

        // Making sure that manager.getProgress() returns correct progress
        // in "onEngineStatusUpdate" callback.
        doAnswer(answer -> {
            assertEquals(0.2f, mUpdateManager.getProgress(), 1E-5);
            return null;
        }).when(statusUpdateCallback).accept(anyInt());

        mUpdateManager.bind();

        verify(statusUpdateCallback, times(1)).accept(4);
    }

}