/*
 * Copyright (C) 2022 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.layout

import android.graphics.Rect
import android.testing.TestableLooper.RunWithLooper
import android.view.View
import android.widget.FrameLayout
import androidx.test.ext.junit.runners.AndroidJUnit4
import androidx.test.filters.SmallTest
import com.android.systemui.SysuiTestCase
import com.android.systemui.util.mockito.any
import com.google.common.truth.Truth.assertThat
import org.junit.Before
import org.junit.Test
import org.junit.runner.RunWith
import org.mockito.Mock
import org.mockito.Mockito.doAnswer
import org.mockito.Mockito.never
import org.mockito.Mockito.reset
import org.mockito.Mockito.spy
import org.mockito.Mockito.verify
import org.mockito.MockitoAnnotations

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

    companion object {
        private val START_SIDE_BOUNDS = Rect(50, 100, 150, 200)
        private val END_SIDE_BOUNDS = Rect(250, 300, 350, 400)
    }

    @Mock private lateinit var boundsChangeListener: StatusBarBoundsProvider.BoundsChangeListener

    private lateinit var boundsProvider: StatusBarBoundsProvider

    private lateinit var startSideContent: View
    private lateinit var endSideContent: View

    @Before
    fun setUp() {
        MockitoAnnotations.initMocks(this)

        startSideContent = spy(FrameLayout(context)).apply { setBoundsOnScreen(START_SIDE_BOUNDS) }
        endSideContent = spy(FrameLayout(context)).apply { setBoundsOnScreen(END_SIDE_BOUNDS) }

        boundsProvider = StatusBarBoundsProvider(startSideContent, endSideContent)
        boundsProvider.addChangeListener(boundsChangeListener)
        reset(boundsChangeListener)
    }

    @Test
    fun visibleStartSideBounds_returnsBoundsFromStartSideContentView() {
        assertThat(boundsProvider.visibleStartSideBounds).isEqualTo(START_SIDE_BOUNDS)
    }

    @Test
    fun visibleEndSideBounds_returnsBoundsFromEndSideContentView() {
        assertThat(boundsProvider.visibleEndSideBounds).isEqualTo(END_SIDE_BOUNDS)
    }

    @Test
    fun startBoundsChange_afterStart_notifiesListener() {
        boundsProvider.start()
        val newBounds = Rect(START_SIDE_BOUNDS).apply { left += 1 }

        startSideContent.setBoundsOnScreen(newBounds)

        verify(boundsChangeListener).onStatusBarBoundsChanged(any())
    }

    @Test
    fun startBoundsChange_beforeStart_doesNotNotifyListener() {
        val newBounds = Rect(START_SIDE_BOUNDS).apply { left += 1 }

        startSideContent.setBoundsOnScreen(newBounds)

        verify(boundsChangeListener, never()).onStatusBarBoundsChanged(any())
    }

    @Test
    fun startBoundsChange_afterStop_doesNotNotifyListener() {
        boundsProvider.start()
        boundsProvider.stop()
        val newBounds = Rect(START_SIDE_BOUNDS).apply { left += 1 }

        startSideContent.setBoundsOnScreen(newBounds)

        verify(boundsChangeListener, never()).onStatusBarBoundsChanged(any())
    }

    @Test
    fun startLayoutChange_afterStart_boundsOnScreenSame_doesNotNotifyListener() {
        boundsProvider.start()
        val newBounds = Rect(START_SIDE_BOUNDS).apply { left += 1 }

        startSideContent.layout(newBounds)

        verify(boundsChangeListener, never()).onStatusBarBoundsChanged(any())
    }

    @Test
    fun endBoundsChange_afterStart_notifiesListener() {
        boundsProvider.start()
        val newBounds = Rect(START_SIDE_BOUNDS).apply { right += 1 }

        endSideContent.setBoundsOnScreen(newBounds)

        verify(boundsChangeListener).onStatusBarBoundsChanged(any())
    }

    @Test
    fun endBoundsChange_beforeStart_doesNotNotifyListener() {
        val newBounds = Rect(START_SIDE_BOUNDS).apply { right += 1 }

        endSideContent.setBoundsOnScreen(newBounds)

        verify(boundsChangeListener, never()).onStatusBarBoundsChanged(any())
    }

    @Test
    fun endBoundsChange_afterStop_doesNotNotifyListener() {
        boundsProvider.start()
        boundsProvider.stop()
        val newBounds = Rect(START_SIDE_BOUNDS).apply { right += 1 }

        endSideContent.setBoundsOnScreen(newBounds)

        verify(boundsChangeListener, never()).onStatusBarBoundsChanged(any())
    }

    @Test
    fun endLayoutChange_afterStart_boundsOnScreenSame_doesNotNotifyListener() {
        boundsProvider.start()
        val newBounds = Rect(START_SIDE_BOUNDS).apply { right += 1 }

        endSideContent.layout(newBounds)

        verify(boundsChangeListener, never()).onStatusBarBoundsChanged(any())
    }
}

private fun View.setBoundsOnScreen(bounds: Rect) {
    doAnswer { invocation ->
            val boundsOutput = invocation.arguments[0] as Rect
            boundsOutput.set(bounds)
            return@doAnswer Unit
        }
        .`when`(this)
        .getBoundsOnScreen(any())
    layout(bounds.left, bounds.top, bounds.right, bounds.bottom)
}

private fun View.layout(rect: Rect) {
    layout(rect.left, rect.top, rect.right, rect.bottom)
}