package log

import (
	"fmt"
	"git.giftfish.de/ston1th/docstore/pkg/core"
	"sync"
)

const defaultSize = 500

type ScanLog struct {
	// protects logs
	sync.RWMutex

	size int
	logs []string
}

func NewScanLog(size int) *ScanLog {
	if size <= 0 {
		size = defaultSize
	}
	return &ScanLog{size: size}
}

func (l *ScanLog) Printf(f string, v ...interface{}) {
	s := fmt.Sprintf(f, v...)
	Println(s)
	s = core.LogTime() + s
	l.Lock()
	logsLen := len(l.logs)
	if logsLen < l.size {
		l.logs = append(l.logs, s)
	} else if logsLen == l.size {
		l.logs = append(l.logs[1:], s)
	}
	l.Unlock()
}

func (l *ScanLog) Logs() (logs string) {
	l.RLock()
	for _, v := range l.logs {
		logs += "\n" + v
	}
	l.RUnlock()
	return
}