// Package cache provides a lightweight in-process TTL cache for DID → avatar CID mappings.
package cache

import (
	"sync"
	"time"
)

const ttl = 5 * time.Minute

type entry struct {
	cid      string
	mimeType string
	expiry   time.Time
}

// CIDCache caches DID → (avatar CID, mimeType) with a fixed 5-minute TTL.
type CIDCache struct {
	m sync.Map
}

func (c *CIDCache) Get(did string) (cid, mimeType string, ok bool) {
	v, ok := c.m.Load(did)
	if !ok {
		return "", "", false
	}
	e := v.(entry)
	if time.Now().After(e.expiry) {
		c.m.Delete(did)
		return "", "", false
	}
	return e.cid, e.mimeType, true
}

func (c *CIDCache) Set(did, cid, mimeType string) {
	c.m.Store(did, entry{cid: cid, mimeType: mimeType, expiry: time.Now().Add(ttl)})
}