/*
 * Copyright 2018 Allan Wang
 *
 * 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 ca.allanwang.kau.kotlin

import kotlin.test.assertEquals
import org.junit.Ignore
import org.junit.Test

/**
 * Created by Allan Wang on 2017-08-05.
 */
class DebounceTest {

    @Test
    fun basic() {
        var i = 0
        val debounce = debounce(20) { i++ }
        assertEquals(0, i, "i should start as 0")
        (1..5).forEach { debounce() }
        Thread.sleep(50)
        assertEquals(1, i, "Debouncing did not cancel previous requests")
    }

    @Test
    fun basicExtension() {
        var i = 0
        val increment: () -> Unit = { i++ }
        (1..5).forEach { increment() }
        assertEquals(5, i, "i should be 5")
        val debounce = increment.debounce(50)
        (6..10).forEach { debounce() }
        assertEquals(5, i, "i should not have changed")
        Thread.sleep(100)
        assertEquals(6, i, "i should increment to 6")
    }

    @Test
    @Ignore("Pending fix")
    fun multipleDebounces() {
        var i = 0
        val debounce = debounce<Int>(20) { i += it }
        debounce(1) // ignore -> i = 0
        Thread.sleep(10)
        assertEquals(0, i)
        debounce(2) // accept -> i = 2
        Thread.sleep(30)
        assertEquals(2, i)
        debounce(4) // ignore -> i = 2
        Thread.sleep(10)
        assertEquals(2, i)
        debounce(8) // accept -> i = 10
        Thread.sleep(30)
        assertEquals(10, i)
    }
}