Practice Time: shouldChangeWater()

 

import java.util.Random

// File:            Main.kt
// Programmer:      Engineer Nolverto Urias Obeso
// Creation Date:   06/15/2023
// Email:           nolvertou@gmail.com
// Description:

fun main() {
    feedTheFish()
}

fun feedTheFish() {
    println("Hello, Kotlin")
    val day = randomDay()
    val food = fishFood(day)
    println("Today is $day and the fish eat $food")

    shouldChangeWater(day, 20, 50)
    shouldChangeWater(day)
    shouldChangeWater(day, dirty = 50)

    if(shouldChangeWater(day)){
        println("Change the water today")
    }
}

fun fishFood(day: String): String{
    var food = "fasting"    // Default Food for the fish

    return when(day){
        "Monday"    ->  "flakes"
        "Wednesday" ->  "redworms"
        "Thursday"  ->  "mosquitoes"
        "Sunday"    ->  "plankton"
        else        ->  "fasting"
    }
}

fun randomDay(): String {
    val week = listOf("Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday")
    return week[Random().nextInt(7)]
}

fun shouldChangeWater(
    day: String,
    temperature: Int = 22,
    dirty: Int = getDirtySensorReading()
): Boolean{

    return when{
        isTooHot(temperature)   -> true
        isDirty(dirty)          -> true
        isSunday(day)           -> true
        else                    -> false
    }
}

fun isTooHot(temperature: Int) = temperature > 30
fun isDirty(dirty: Int) = dirty > 30
fun isSunday(day: String) = day == "Sunday"

fun getDirtySensorReading() = 20