package system

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

// MovableObject 一维移动的物体
type MovableObject struct {
	Value int64
	//移动方向：0-不动，1-变大，-1 -变小
	direction int8
}

func NewMovableObject() *MovableObject {
	return &MovableObject{Value: 0, direction: 0}
}

// MovableObjectComponent 一维移动的物体组件
var MovableObjectComponent = ecs.NewComponentType[MovableObject]()
var MovableObject1Component = ecs.NewComponentType[MovableObject]()
var MovableObject2Component = ecs.NewComponentType[MovableObject]()

type MovableSystem struct {
	query *ecs.Query
}

func NewMovableSystem() *MovableSystem {
	return &MovableSystem{
		query: ecs.NewQuery(filter.Or(filter.Contains(MovableObjectComponent), filter.Contains(MovableObject1Component), filter.Contains(MovableObject2Component))),
	}
}

// Update world 执行
func (me *MovableSystem) Update(w ecs.World) {
	me.query.Each(w, func(e *ecs.Entry) {

		if e.HasComponent(MovableObjectComponent) {
			MovableObjectComponent.Get(e).move(w.Tick())
		}
		if e.HasComponent(MovableObject1Component) {
			MovableObject1Component.Get(e).move(w.Tick())
		}
		if e.HasComponent(MovableObject2Component) {
			MovableObject2Component.Get(e).move(w.Tick())
		}
	})
}

////////////////////////////////////////////////

func (me *MovableObject) move(tick int) {
	if me.direction != 0 {
		if me.direction > 0 {
			me.Value += int64(tick)
		} else {
			me.Value -= int64(tick)
		}
	}
}

// 暂停
func (me *MovableObject) Pause() {
	me.direction = 0
}

// 前进
func (me *MovableObject) Forward() {
	me.direction = 1
}

// 后退
func (me *MovableObject) Retreat() {
	me.direction = -1
}