//go:build linux

package temperature

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

func getLinuxCPUTemperature() (TemperatureInformation, error) {
	tempFile, err := os.Open("/sys/class/thermal/thermal_zone0/temp")
	if err != nil {
		fmt.Printf("Could not find /sys/class/thermal/thermal_zone0/temp. Trying /sys/class/hwmon/hwmon0/temp1_input...")
		tempFile, err = os.Open("/sys/class/hwmon/hwmon0/temp1_input")
		if err != nil {
			return TemperatureInformation{0, false}, fmt.Errorf("Couldn't find temperature information. System is unsupported.")
		}
	}
	defer tempFile.Close()

	fileReader := bufio.NewScanner(tempFile)

	var celsius float64

	fileReader.Scan()
	if fileReader.Err() != nil {
		return TemperatureInformation{0, false}, fmt.Errorf("Could not read temperature.")
	}

	data := fileReader.Text()
	celsius, _ = strconv.ParseFloat(data, 64)

	return TemperatureInformation{
		Celsius:   celsius / 1000.0,
		Supported: true,
	}, nil
}

func GetTemperatureInformation() (TemperatureInformation, error) {
	return getLinuxCPUTemperature()
}