package variables

import (
    "encoding/binary"
    "os"
    "sync/atomic"
    "time"
)

const lastEventFile = "last_event.dat"

var LastEvent atomic.Int64

func InitLastEvent() {
    data, err := os.ReadFile(lastEventFile)
    if err == nil && len(data) == 8 {
        value := int64(binary.LittleEndian.Uint64(data))
        LastEvent.Store(value)
    }

    go periodicSave()
}

func SaveLastEvent() error {
    value := LastEvent.Load()
    data := make([]byte, 8)
    binary.LittleEndian.PutUint64(data, uint64(value))
    return os.WriteFile(lastEventFile, data, 0644)
}

func periodicSave() {
    ticker := time.NewTicker(1 * time.Minute)
    for range ticker.C {
        SaveLastEvent()
    }
}