Hexagonal Architecture

// Demo Hexagonal Architecture (Ports and Adapters): core domain terisolasi.

import java.time.LocalDate

// === CORE DOMAIN: tidak tahu tentang DB, web, atau external services ===
data class Tugas(val id: Int, val judul: String, val selesai: Boolean)

class ManajerTugas {
    private val tugas = mutableMapOf<Int, Tugas>()
    private var nextId = 1

    fun buat(judul: String): Tugas {
        val t = Tugas(nextId++, judul, false)
        tugas[t.id] = t
        return t
    }

    fun tandaiSelesai(id: Int): Tugas? {
        val t = tugas[id] ?: return null
        val updated = t.copy(selesai = true)
        tugas[id] = updated
        return updated
    }

    fun semua(): List<Tugas> = tugas.values.toList()
    fun cari(id: Int): Tugas? = tugas[id]
}

// === PORTS: interfaces yang mendefinisikan interaksi core domain dengan dunia luar ===

// Driving port (primary): bagaimana dunia luar memanggil core
interface TugasApi {
    fun buatTugas(judul: String): Tugas
    fun selesaikanTugas(id: Int): Tugas?
    fun daftarTugas(): List<Tugas>
}

// Driven port (secondary): bagaimana core domain memanggil dunia luar
interface TugasRepository {
    fun simpan(tugas: Tugas)
    fun muat(id: Int): Tugas?
}

interface NotifierPort {
    fun kirim(pesan: String)
}

// === APPLICATION SERVICE: mengorkestrasi core domain + ports ===
class TugasService(
    private val manager: ManajerTugas,
    private val repo: TugasRepository,
    private val notifier: NotifierPort
) : TugasApi {
    override fun buatTugas(judul: String): Tugas {
        val t = manager.buat(judul)
        repo.simpan(t)
        notifier.kirim("Tugas dibuat: ${t.judul}")
        return t
    }

    override fun selesaikanTugas(id: Int): Tugas? {
        val t = manager.tandaiSelesai(id) ?: return null
        repo.simpan(t)
        notifier.kirim("Tugas selesai: ${t.judul}")
        return t
    }

    override fun daftarTugas(): List<Tugas> = manager.semua()
}

// === ADAPTERS: implementasi konkret dari ports ===

// Driving adapter: console UI
class CliTugasAdapter(private val api: TugasApi) {
    fun jalankan() {
        println("=== Hexagonal: CLI Adapter ===")
        val t1 = api.buatTugas("Belajar Kotlin")
        val t2 = api.buatTugas("Review PR tim")
        api.selesaikanTugas(t1.id)
        println("Daftar tugas:")
        api.daftarTugas().forEach { println("  ${it.id}. [${if (it.selesai) "x" else " "}] ${it.judul}") }
    }
}

// Driving adapter: REST API (simulasi)
class RestTugasAdapter(private val api: TugasApi) {
    fun handlePost(judul: String) = api.buatTugas(judul)
    fun handleGetAll() = api.daftarTugas()
}

// Driven adapter: in-memory repository
class InMemoryTugasRepository : TugasRepository {
    private val store = mutableMapOf<Int, Tugas>()
    override fun simpan(tugas: Tugas) { store[tugas.id] = tugas }
    override fun muat(id: Int): Tugas? = store[id]
}

// Driven adapter: email notifier
class ConsoleNotifier : NotifierPort {
    override fun kirim(pesan: String) = println("[notifier] $pesan")
}

// Driven adapter: file notifier (simulasi)
class FileNotifier : NotifierPort {
    override fun kirim(pesan: String) = println("[file] append log: $pesan")
}

fun main() {
    println("=== Demo Hexagonal Architecture ===")

    val manager = ManajerTugas()
    val repo = InMemoryTugasRepository()
    val notifier = ConsoleNotifier()
    val service = TugasService(manager, repo, notifier)

    // Adapter driving: console
    CliTugasAdapter(service).jalankan()

    println()
    println("--- Ganti adapter: REST + FileNotifier ---")
    val fileNotif = FileNotifier()
    val service2 = TugasService(ManajerTugas(), InMemoryTugasRepository(), fileNotif)
    val rest = RestTugasAdapter(service2)
    rest.handlePost("Tulis dokumentasi")
    rest.handlePost("Deploy ke staging")
    println("Via REST GET: ${rest.handleGetAll().size} tugas")
}

=== Demo Hexagonal Architecture ===
=== Hexagonal: CLI Adapter ===
[notifier] Tugas dibuat: Belajar Kotlin
[notifier] Tugas dibuat: Review PR tim
[notifier] Tugas selesai: Belajar Kotlin
Daftar tugas:
  1. [x] Belajar Kotlin
  2. [ ] Review PR tim

--- Ganti adapter: REST + FileNotifier ---
[file] append log: Tugas dibuat: Tulis dokumentasi
[file] append log: Tugas dibuat: Deploy ke staging
Via REST GET: 2 tugas