package singleton

import (
	"sync"

	"joylink.club/ecs"
)

var EntityUidIndexType = ecs.NewComponentType[EntityUidIndex]()

// 对象实体Uid索引
// 只索引具有uid且不会销毁的实体
type EntityUidIndex struct {
	mu        sync.RWMutex
	entityMap map[string]ecs.Entity
}

func (idx *EntityUidIndex) Add(uid string, entity ecs.Entity) {
	idx.mu.Lock()
	defer idx.mu.Unlock()
	idx.entityMap[uid] = entity
}

func (idx *EntityUidIndex) Get(uid string) ecs.Entity {
	idx.mu.RLock()
	defer idx.mu.RUnlock()
	return idx.entityMap[uid]
}

func loadUidEntityIndex(w ecs.World) {
	entry := w.Entry(w.Create(EntityUidIndexType))
	EntityUidIndexType.Set(entry, &EntityUidIndex{
		entityMap: make(map[string]ecs.Entity, 512),
	})
}