package progress

import (
	"fmt"
	"io"
	"sync"
)

type Reporter struct {
	Total  int
	cur    int
	mu     sync.Mutex
	writer io.Writer
}

func NewReporter(writer io.Writer) Reporter {
	return Reporter{writer: writer}
}

func (r *Reporter) ReportProgress(num int) {
	r.mu.Lock()
	if num > r.cur {
		fmt.Fprintf(r.writer, "%d/%d\n", num, r.Total)
		r.cur = num
	}
	r.mu.Unlock()
}