/*
 * Copyright (C) 2025 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.eyedropper.desktop

import android.content.Intent
import android.graphics.Bitmap
import android.hardware.display.DisplayManager
import android.os.Handler
import android.os.Looper
import android.view.Display
import android.view.View
import android.view.WindowManager
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.platform.ComposeView
import androidx.compose.ui.test.junit4.createEmptyComposeRule
import androidx.lifecycle.findViewTreeLifecycleOwner
import androidx.test.ext.junit.runners.AndroidJUnit4
import androidx.test.platform.app.InstrumentationRegistry
import androidx.test.rule.ServiceTestRule
import com.android.eyedropper.di.MainThreadHandlerModule
import com.android.eyedropper.util.InputHelper
import com.android.eyedropper.util.ScreenCaptureHelper
import com.android.eyedropper.util.WindowHelper
import com.google.common.truth.Truth.assertThat
import dagger.hilt.android.testing.BindValue
import dagger.hilt.android.testing.HiltAndroidRule
import dagger.hilt.android.testing.HiltAndroidTest
import dagger.hilt.android.testing.UninstallModules
import java.util.concurrent.TimeoutException
import kotlinx.coroutines.CompletableDeferred
import org.junit.After
import org.junit.Before
import org.junit.Rule
import org.junit.Test
import org.junit.runner.RunWith
import org.mockito.kotlin.any
import org.mockito.kotlin.argumentCaptor
import org.mockito.kotlin.doReturn
import org.mockito.kotlin.eq
import org.mockito.kotlin.mock
import org.mockito.kotlin.stub
import org.mockito.kotlin.verify

/**
 * Test class for [DesktopControllerService]
 *
 * Usage: atest EyeDropperUnitTests:DesktopControllerTest
 */
@UninstallModules(MainThreadHandlerModule::class)
@HiltAndroidTest
@RunWith(AndroidJUnit4::class)
class DesktopControllerServiceTest {

    @get:Rule(order = 0) val hiltRule = HiltAndroidRule(this)
    @get:Rule(order = 1) val serviceRule: ServiceTestRule = ServiceTestRule()

    // Will be incorrectly attached to Activity by default if not empty
    @get:Rule(order = 2) val composeTestRule = createEmptyComposeRule()

    private val displayId = Display.DEFAULT_DISPLAY

    @BindValue val mockInputHelper = mock<InputHelper> {
        on { isDesktopMode() } doReturn true
        on { getCursorPosition(any()) } doReturn Pair(displayId, Offset(10f, 10f))
    }
    @BindValue val mockWindowHelper = mock<WindowHelper>()
    @BindValue val mockScreenCaptureHelper = mock<ScreenCaptureHelper>()
    @BindValue val mockInputDeviceListener = mock<DesktopInputDeviceListener>()
    @BindValue val mainThreadHandler = Handler(Looper.getMainLooper())

    private val context = InstrumentationRegistry.getInstrumentation().targetContext
    private lateinit var service: DesktopControllerService

    @Before
    fun setUp() {
        hiltRule.inject()
        val mockDisplay = context.getSystemService(
            DisplayManager::class.java
        ).getDisplay(displayId)
        val mockWindowContext = context.createDisplayContext(mockDisplay)
            .createWindowContext(WindowManager.LayoutParams.TYPE_SCREENSHOT, null)
        val mockWindowManager = mockWindowContext.getSystemService(WindowManager::class.java)
        mockWindowHelper.stub {
            on { getWindowContext(any(), any()) } doReturn mockWindowContext
            on { getWindowManager(any()) } doReturn mockWindowManager
        }
        try {
            val binder = serviceRule.bindService(
                Intent(context, DesktopControllerService::class.java)
            )
            service = (binder as DesktopControllerService.LocalBinder).getService()
            // Must manually initialize the lateinit var, b/c normally init by MainActivity
            val dummyDeferredBitmap =
                CompletableDeferred(Bitmap.createBitmap(10, 10, Bitmap.Config.ARGB_8888))
            service.displayIdToDeferredScreenshotMap = mapOf(Pair(displayId, dummyDeferredBitmap))
        } catch (e: TimeoutException) {
            throw RuntimeException("Failed to bind to DesktopController service", e)
        }
    }

    @After
    fun tearDown() {
        InstrumentationRegistry.getInstrumentation().runOnMainSync {
            service.removeUiOverlay()
        }
    }

    @Test
    fun onBind_returnsBinder() {
        // Implicitly tested in setUp, binder is obtained there.
        assertThat(service).isNotNull()
    }

    @Test
    fun showUiOverlay_addsViewAndRegistersListener() {
        val onSelectColor: (Int) -> Unit = mock()
        val onAbort: () -> Unit = mock()

        InstrumentationRegistry.getInstrumentation().runOnMainSync {
            service.showUiOverlay(onSelectColor, onAbort)
        }
        composeTestRule.waitForIdle()

        val viewCaptor = argumentCaptor<View>()
        verify(
            mockWindowHelper
        ).addFocusedTransparentOverlay(any<WindowManager>(), viewCaptor.capture())
        verify(mockInputHelper).registerInputDeviceListener(eq(mockInputDeviceListener))
        verify(mockInputDeviceListener).initialize(any())

        val capturedView = viewCaptor.firstValue
        assertThat(capturedView).isInstanceOf(ComposeView::class.java)
        assertThat(capturedView.findViewTreeLifecycleOwner()).isSameInstanceAs(service)
    }

    @Test
    fun removeUiOverlay_removesViewAndUnregistersListener() {
        val onSelectColor: (Int) -> Unit = mock()
        val onAbort: () -> Unit = mock()
        InstrumentationRegistry.getInstrumentation().runOnMainSync {
            service.showUiOverlay(onSelectColor, onAbort)
        }
        composeTestRule.waitForIdle()

        InstrumentationRegistry.getInstrumentation().runOnMainSync {
            service.removeUiOverlay()
        }
        composeTestRule.waitForIdle()

        verify(mockWindowHelper).removeView(any<WindowManager>(), any<ComposeView>())
        verify(mockInputHelper).unregisterInputDeviceListener(mockInputDeviceListener)
    }

    @Test
    fun wrappedOnAbort_removesOverlayAndCallsCallback() {
        val onSelectColor: (Int) -> Unit = mock()
        val onAbort: () -> Unit = mock()

        InstrumentationRegistry.getInstrumentation().runOnMainSync {
            service.showUiOverlay(onSelectColor, onAbort)
        }
        composeTestRule.waitForIdle()

        val abortCaptor = argumentCaptor<() -> Unit>()
        verify(mockInputDeviceListener).initialize(abortCaptor.capture())

        InstrumentationRegistry.getInstrumentation().runOnMainSync {
            abortCaptor.firstValue.invoke()
        }
        composeTestRule.waitForIdle()

        verify(mockWindowHelper).removeView(any<WindowManager>(), any<ComposeView>())
        verify(mockInputHelper).unregisterInputDeviceListener(mockInputDeviceListener)
        verify(onAbort).invoke()
    }
}