// Package realtimedata define real time data operation functions
package realtimedata

import (
	"context"
	"time"
)

// CacheItem define structure for caching real time data with calculation capabilities
type CacheItem struct {
	key   string
	value []any
	// TODO 增加实时数据的topic
	topic          string
	cancelFunc     context.CancelFunc
	calculatorFunc func(ctx context.Context, topic string, params []any)
	lastAccessed   time.Time
}

// Reset defines func to reset the CacheItem to its zero state
func (ci *CacheItem) Reset() {
	ci.key = ""
	ci.value = nil
	if ci.cancelFunc != nil {
		ci.cancelFunc()
	}
	ci.cancelFunc = nil
	ci.calculatorFunc = nil
	ci.lastAccessed = time.Time{}
}

// IsExpired defines func to check if the cache item has expired based on a given TTL
func (ci *CacheItem) IsExpired(ttl time.Duration) bool {
	return time.Since(ci.lastAccessed) > ttl
}