package road

import (
	"go.uber.org/zap"
	"sync"
	"time"
)

type Monitor interface {
	Increment()
	Start()
}

type DefaultMonitor struct {
	muCounter sync.Mutex
	counter   uint
}

func (d *DefaultMonitor) Increment() {
	d.muCounter.Lock()
	defer d.muCounter.Unlock()
	d.counter = d.counter + 1
}

func (d *DefaultMonitor) Start() {
	start := time.Now().UnixNano()
	for {
		select {
		case <-time.After(10 * time.Second):
			start = d.displayFPS(start)

		}
	}

}

func (d *DefaultMonitor) displayFPS(start int64) int64 {
	d.muCounter.Lock()
	defer d.muCounter.Unlock()

	end := time.Now().UnixNano()
	count := int64(d.counter)
	go func() {
		zap.S().Infof("Current FPS: %d img/s", count/((end-start)/1_000_000_000))
	}()
	d.counter = 0
	return end
}

type FakeMonitor struct{}

func (f *FakeMonitor) Increment() {}

func (f *FakeMonitor) Start() {}