/*
 * Copyright (C) 2021 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.test.input

import android.os.IBinder
import android.os.InputConstants.DEFAULT_DISPATCHING_TIMEOUT_MILLIS
import android.os.Looper
import android.view.InputChannel
import android.view.InputEvent
import android.view.InputEventReceiver
import android.view.InputEventSender
import android.view.KeyEvent
import android.view.MotionEvent
import com.android.cts.input.BlockingQueueEventVerifier
import java.util.concurrent.LinkedBlockingQueue
import java.util.concurrent.TimeUnit
import org.hamcrest.Matcher
import org.junit.Assert.assertEquals
import org.junit.Assert.assertNotNull
import org.junit.Assert.assertNull

private fun <T> getEvent(queue: LinkedBlockingQueue<T>): T? {
    return queue.poll(DEFAULT_DISPATCHING_TIMEOUT_MILLIS.toLong(), TimeUnit.MILLISECONDS)
}

private fun <T> assertNoEvents(queue: LinkedBlockingQueue<T>) {
    // Poll the queue with a shorter timeout, to make the check faster.
    assertNull(queue.poll(100L, TimeUnit.MILLISECONDS))
}

open class SpyInputEventReceiver(channel: InputChannel, looper: Looper) :
    InputEventReceiver(channel, looper) {
    companion object {
        @JvmStatic external fun createNativeService(): IBinder

        init {
            System.loadLibrary("inputtests_jni")
        }
    }

    private val inputEvents = LinkedBlockingQueue<InputEvent>()
    private val verifier = BlockingQueueEventVerifier(inputEvents)
    private val service = IInputTests.Stub.asInterface(createNativeService())

    override fun onInputEvent(event: InputEvent) {
        addInputEvent(event)
        finishInputEvent(event, true /*handled*/)
    }

    private fun addInputEvent(event: InputEvent) {
        when (event) {
            is KeyEvent -> inputEvents.put(KeyEvent.obtain(event))
            is MotionEvent -> inputEvents.put(MotionEvent.obtain(event))
            else -> throw Exception("Received $event is neither a key nor a motion")
        }
    }

    fun assertNoEvents() {
        assertNoEvents(inputEvents)
    }

    fun reportTimeline(inputEventId: Int, gpuCompletedTime: Long, presentTime: Long) {
        service.reportTimeline(
            nativeFrameMetricsObserver,
            inputEventId,
            gpuCompletedTime,
            presentTime,
        )
    }

    fun assertReceivedKey(matcher: Matcher<KeyEvent>) {
        verifier.assertReceivedKey(matcher)
    }
}

class SpyInputEventSender(channel: InputChannel, looper: Looper) :
    InputEventSender(channel, looper) {
    data class FinishedSignal(val seq: Int, val handled: Boolean)

    data class Timeline(val inputEventId: Int, val gpuCompletedTime: Long, val presentTime: Long)

    private val mFinishedSignals = LinkedBlockingQueue<FinishedSignal>()
    private val mTimelines = LinkedBlockingQueue<Timeline>()

    override fun onInputEventFinished(seq: Int, handled: Boolean) {
        mFinishedSignals.put(FinishedSignal(seq, handled))
    }

    override fun onTimelineReported(inputEventId: Int, gpuCompletedTime: Long, presentTime: Long) {
        mTimelines.put(Timeline(inputEventId, gpuCompletedTime, presentTime))
    }

    fun assertReceivedFinishedSignal(seq: Int, handled: Boolean) {
        val finished = getEvent(mFinishedSignals)
        assertNotNull("Did not receive 'finished' event", finished)
        assertEquals("Unexpected sequence number", seq, finished!!.seq)
        assertEquals("Unexpected 'handled' value", handled, finished!!.handled)
    }

    fun getTimeline(): Timeline? {
        return getEvent(mTimelines)
    }

    fun assertNoEvents() {
        assertNoEvents(mFinishedSignals)
        assertNoEvents(mTimelines)
    }
}