package permlib

import (
	"sync"
	"time"

	"golang.org/x/sync/singleflight"
)

type cachedUser struct {
	UserId      int64
	Username    string
	ProductCode string
	MemberType  string
	Perms       []string
	expiresAt   time.Time
}

type permCache struct {
	store sync.Map
	ttl   time.Duration
	sf    singleflight.Group
}

func newPermCache(ttl time.Duration) *permCache {
	return &permCache{ttl: ttl}
}

func (c *permCache) get(key string) (*cachedUser, bool) {
	v, ok := c.store.Load(key)
	if !ok {
		return nil, false
	}
	entry := v.(*cachedUser)
	if time.Now().After(entry.expiresAt) {
		c.store.Delete(key)
		return nil, false
	}
	return entry, true
}

func (c *permCache) set(key string, u *cachedUser) {
	u.expiresAt = time.Now().Add(c.ttl)
	c.store.Store(key, u)
}