package examples.showcase

import fmt
import strings

interface Greeter {
    fun greet(name: String): String
}

class PrefixGreeter(val prefix: String): Greeter {
    fun greet(name: String): String {
        return prefix + " " + name
    }
}

worker Counter {
    val count = 0

    fun increment() {
        count += 1
    }

    fun value(): Int {
        return count
    }
}

fun risky(input: String): String {
    if (input == "boom") {
        throw "boom requested"
    }
    return input
}

fun main() {
    val greeter: Greeter = PrefixGreeter("hello")
    println(greeter.greet("gotlin"))

    val names = listOf<String>("ada", "linus")
    val scores = mapOf<String, Int>("ada", 10, "linus", 8)
    println(names)
    println(scores)

    val upper = strings.ToUpper("gotlin")
    fmt.Println("interop:", upper)

    val result = runCatching({ risky("boom") })
    if (result.isSuccess()) {
        println("runCatching: success")
    } else {
        println("runCatching:")
        println(result.exceptionOrNull())
    }

    val maybe: any = null
    if (maybe == null) {
        println("null check works")
    }

    val counter = Counter()
    counter.increment()
    counter.increment()
    fmt.Println("worker value:", counter.value())

    val ready = Channel<String>()
    go {
        select {
            after(120) -> ready.send("timer fired")
        }
    }
    select {
        ready -> println("channel says: " + it)
    }

    select {
        every(50) -> println("one periodic tick")
    }
}