package alg

import (
	"hk4e/pkg/logger"
)

// Grid 地图格子
type Grid struct {
	gid uint32 // 格子id
	// 格子边界坐标
	minX        int16
	maxX        int16
	minY        int16
	maxY        int16
	minZ        int16
	maxZ        int16
	entityIdMap map[uint32]bool // k:entityId v:是否存在
}

// NewGrid 初始化格子
func NewGrid(gid uint32, minX, maxX, minY, maxY, minZ, maxZ int16) (r *Grid) {
	r = new(Grid)
	r.gid = gid
	r.minX = minX
	r.maxX = maxX
	r.minY = minY
	r.maxY = maxY
	r.minZ = minZ
	r.maxZ = maxZ
	r.entityIdMap = make(map[uint32]bool)
	return r
}

// AddEntityId 向格子中添加一个实体id
func (g *Grid) AddEntityId(entityId uint32) {
	g.entityIdMap[entityId] = true
}

// RemoveEntityId 从格子中删除一个实体id
func (g *Grid) RemoveEntityId(entityId uint32) {
	_, exist := g.entityIdMap[entityId]
	if exist {
		delete(g.entityIdMap, entityId)
	} else {
		logger.Error("remove entity id but it not exist, entityId: %v", entityId)
	}
}

// GetEntityIdList 获取格子中所有实体id
func (g *Grid) GetEntityIdList() (entityIdList []uint32) {
	entityIdList = make([]uint32, 0)
	for k := range g.entityIdMap {
		entityIdList = append(entityIdList, k)
	}
	return entityIdList
}