package system

import (
	"github.com/yohamta/donburi/filter"
	"joylink.club/ecs"
	"joylink.club/rtsssimulation/components"
)

// 按速度移动的设备系统
// 只负责按速度移动位置，由该组件的观察者负责解释位置
type MovableDeviceSystem struct {
	query *ecs.Query
}

func NewMovableDeviceSystem() *MovableDeviceSystem {
	return &MovableDeviceSystem{query: ecs.NewQuery(filter.Contains(components.MovableDeviceStateComponent))}
}

// world 执行
func (me *MovableDeviceSystem) Update(world ecs.World) {
	me.query.Each(world, func(e *ecs.Entry) {
		md := components.MovableDeviceStateComponent.Get(e)
		if md.Speed > 0 {
			if md.ToH {
				md.Position += int64(md.Speed)
			} else {
				md.Position -= int64(md.Speed)
			}
		}
	})
}