package proc

import (
	"fmt"
	"os"
	"path/filepath"
	"strconv"
	"strings"
)

type IntelReader struct {
	hwmonDir string
	driver   string
}

func NewIntelReader() (*IntelReader, error) {
	// Locate Intel coretemp hwmon path
	dirs, err := filepath.Glob("/sys/class/hwmon/hwmon*")
	if err != nil {
		return nil, err
	}

	hwmonDir := ""
	for _, d := range dirs {
		nameData, err := os.ReadFile(filepath.Join(d, "name"))
		if err == nil && strings.TrimSpace(string(nameData)) == "coretemp" {
			hwmonDir = d
			break
		}
	}

	if hwmonDir == "" {
		return nil, fmt.Errorf("coretemp driver not found under /sys/class/hwmon/")
	}

	return &IntelReader{
		hwmonDir: hwmonDir,
		driver:   "coretemp",
	}, nil
}

func (r *IntelReader) ReadTemperatureSensors() ([]TempSensor, error) {
	inputs, err := filepath.Glob(filepath.Join(r.hwmonDir, "temp*_input"))
	if err != nil || len(inputs) == 0 {
		return nil, fmt.Errorf("no temperature inputs found in %s", r.hwmonDir)
	}

	temps := []TempSensor{}

	for _, inputPath := range inputs {
		valBytes, err := os.ReadFile(inputPath)
		if err != nil {
			continue
		}

		milliC, err := strconv.ParseFloat(strings.TrimSpace(string(valBytes)), 64)
		if err != nil {
			continue
		}

		labelPath := strings.TrimSuffix(inputPath, "_input") + "_label"
		label := ""
		if lBytes, err := os.ReadFile(labelPath); err == nil {
			label = strings.TrimSpace(string(lBytes))
		} else {
			label = filepath.Base(strings.TrimSuffix(inputPath, "_input"))
		}

		temps = append(temps, TempSensor{
			Name:  label,
			TempC: milliC / 1000.0,
		})
	}

	return temps, nil
}