package com.jesusbornd.numbers;

import java.util.*;
import java.util.function.Consumer;

public class Numbers_11_Chapter_Lv2 {

    record Event(String type, String detail) {}

    static class EventBus {
        private final Map<String, List<Consumer<Event>>> listeners = new HashMap<>();

        EventBus on(String type, Consumer<Event> handler) {
            listeners.computeIfAbsent(type, k -> new ArrayList<>()).add(handler);
            return this;
        }

        void publish(Event event) {
            System.out.println("📢 이벤트: [" + event.type() + "] " + event.detail());
            List<Consumer<Event>> handlers = listeners.getOrDefault(event.type(), List.of());
            if (handlers.isEmpty()) System.out.println("  → 핸들러 없음");
            else handlers.forEach(h -> h.accept(event));
        }
    }

    public static void main(String[] args) {
        EventBus bus = new EventBus()
            .on("GRUMBLE", e -> System.out.println("  → 메추라기 공급 (응답)"))
            .on("GRUMBLE", e -> System.out.println("  → 진노: 일부 사망"))
            .on("BURDEN",  e -> System.out.println("  → 장로 70인 세워 짐 분담"));

        bus.publish(new Event("GRUMBLE", "고기를 원함"));
        bus.publish(new Event("BURDEN",  "모세가 혼자 감당하기 어려움"));
        bus.publish(new Event("RAIN",    "비 요청"));
    }
}

from dataclasses import dataclass
from collections import defaultdict
from typing import Callable

@dataclass
class Event:
    type: str
    detail: str

class EventBus:
    def __init__(self):
        self._listeners: dict[str, list[Callable[[Event], None]]] = defaultdict(list)

    def on(self, event_type: str, handler: Callable[[Event], None]) -> "EventBus":
        self._listeners[event_type].append(handler)
        return self

    def publish(self, event: Event):
        print(f"📢 이벤트: [{event.type}] {event.detail}")
        handlers = self._listeners.get(event.type, [])
        if not handlers:
            print("  → 핸들러 없음")
        for handler in handlers:
            handler(event)


if __name__ == "__main__":
    bus = (
        EventBus()
        .on("GRUMBLE", lambda e: print("  → 메추라기 공급 (응답)"))
        .on("GRUMBLE", lambda e: print("  → 진노: 일부 사망"))
        .on("BURDEN",  lambda e: print("  → 장로 70인 세워 짐 분담"))
    )

    bus.publish(Event("GRUMBLE", "고기를 원함"))
    bus.publish(Event("BURDEN",  "모세가 혼자 감당하기 어려움"))
    bus.publish(Event("RAIN",    "비 요청"))