package fi

import (
	"fmt"
	"joylink.club/ecs"
	"joylink.club/rtsssimulation/component"
	"joylink.club/rtsssimulation/entity"
)

// AddTrainToWorld 添加列车
func AddTrainToWorld(w ecs.World, trainId string) error {
	result := <-ecs.Request[ecs.EmptyType](w, func() ecs.Result[ecs.EmptyType] {
		wd := entity.GetWorldData(w)
		_, find := wd.EntityMap[trainId]
		if !find {
			entity.NewTrainEntity(w, trainId)
		}
		return ecs.NewOkEmptyResult()
	})
	return result.Err
}

// RemoveTrainFromWorld 移除列车
func RemoveTrainFromWorld(w ecs.World, trainId string) error {
	result := <-ecs.Request[ecs.EmptyType](w, func() ecs.Result[ecs.EmptyType] {
		wd := entity.GetWorldData(w)
		te, find := wd.EntityMap[trainId]
		if find {
			te.Remove()
			delete(wd.EntityMap, trainId)
		}
		return ecs.NewOkEmptyResult()
	})
	return result.Err
}

// UpdateTrainPositionFromDynamics 更新列车所在的物理区段
func UpdateTrainPositionFromDynamics(w ecs.World, tpi TrainPositionInfo) error {
	result := <-ecs.Request[ecs.EmptyType](w, func() ecs.Result[ecs.EmptyType] {
		wd := entity.GetWorldData(w)
		te, find := wd.EntityMap[tpi.TrainId]
		if find {
			train := component.TrainPositionInfoType.Get(te)
			train.Up = tpi.Up
			train.Len = int64(tpi.Len)
			train.HeadLink = tpi.HeadLink
			train.HeadLinkOffset = int64(tpi.TailLinkOffset)
			train.TailLink = tpi.TailLink
			train.TailLinkOffset = int64(tpi.HeadLinkOffset)
			return ecs.NewOkEmptyResult()
		} else {
			return ecs.NewErrResult(fmt.Errorf("列车[%s]实体不存在", tpi.TrainId))
		}

	})
	return result.Err
}

type TrainPositionInfo struct {
	//列车id
	TrainId string
	//列车头当前运行方向（true偏移量增大/false减小方向）
	Up bool
	//列车长度 mm
	Len uint32
	//列车所在轨道link
	HeadLink string
	//列车所在link偏移量（mm）
	HeadLinkOffset uint32
	//列车所在轨道link
	TailLink string
	//列车所在link偏移量（mm）
	TailLinkOffset uint32
}