package collectors

import (
	"bufio"
	"log"
	"os"
	"strconv"
	"strings"
)

func strToFloat32(input string) (float32) {
	f64, err := strconv.ParseFloat(input, 32)
	if err != nil {
		log.Fatal(err)
	}
	f32 := float32(f64)
	return f32
}

func cpuLoad() (load1, load5, load15 float32) {
	const filePath string = "/proc/loadavg"
	var firstLine string

	file, err := os.Open(filePath)
	if err != nil {
		log.Fatal(err)
	}
	defer file.Close()

	scanner := bufio.NewScanner(file)

	if scanner.Scan() {
		firstLine = scanner.Text()
	}

	if err := scanner.Err(); err != nil {
		log.Fatal(err)
	}

	loadAverages := strings.Fields(firstLine)
	load1 = strToFloat32(loadAverages[0])
	load5 = strToFloat32(loadAverages[1])
	load15 = strToFloat32(loadAverages[2])
	return load1, load5, load15
}