import { useEffect, useState } from 'react';
import { EventBus } from '../../game/events/EventBus';

interface CombatHud {
    playerHp: number;
    playerMaxHp: number;
    playerBlock: number;
    energy: number;
    maxEnergy: number;
    handCount: number;
    drawCount: number;
    discardCount: number;
}

const EMPTY_HUD: CombatHud = {
    playerHp: 0,
    playerMaxHp: 0,
    playerBlock: 0,
    energy: 0,
    maxEnergy: 0,
    handCount: 0,
    drawCount: 0,
    discardCount: 0,
};

/** Live combat HUD state, driven by the CombatScene via the EventBus. */
export function useCombatHud() {
    const [hud, setHud] = useState<CombatHud>(EMPTY_HUD);

    useEffect(() => {
        return EventBus.on('combat:state-changed', setHud);
    }, []);

    return hud;
}

/** Current floor/encounter, driven by run + combat events. */
export function useRunProgress() {
    const [floor, setFloor] = useState(1);

    useEffect(() => {
        const unsubNode = EventBus.on('run:node-changed', d => setFloor(d.floor));
        const unsubCombat = EventBus.on('combat:started', d => setFloor(d.floor));
        return () => { unsubNode(); unsubCombat(); };
    }, []);

    return floor;
}