package com.zombie.game.systems;

import com.zombie.game.ecs.ECSWorld;
import com.zombie.game.ecs.System;
import com.zombie.game.ecs.components.*;

import java.util.*;

/**
 * 燃烧区域系统
 *
 * 处理燃烧瓶留下的火焰区域：持续伤害 + 生命周期。
 */
public class FireZoneSystem implements System {

    @Override
    public void update(float dt, ECSWorld world) {
        List<Integer> toRemove = new ArrayList<>();

        for (int entityId : world.getFireZones()) {
            FireZone fz = world.getFireZonesData().get(entityId);
            Position fzPos = world.getPositions().get(entityId);
            if (fz == null || fzPos == null) continue;

            fz.update(dt);

            // 对范围内的僵尸造成持续伤害
            for (int zombieId : world.getZombies()) {
                Health zombieHealth = world.getHealths().get(zombieId);
                Position zombiePos = world.getPositions().get(zombieId);
                if (zombieHealth == null || !zombieHealth.isAlive() || zombiePos == null) continue;

                float dist = fzPos.distanceTo(zombiePos.getX(), zombiePos.getY());
                if (dist < fz.getRadius()) {
                    zombieHealth.takeDamage(fz.getDamagePerTick());
                }
            }

            if (fz.isExpired()) {
                toRemove.add(entityId);
            }
        }

        for (int id : toRemove) {
            world.getFireZones().remove(id);
            world.destroyEntity(id);
        }
    }
}