package api

import (
	"encoding/json"
	"fmt"
	"net/http"
	"os"
	"strings"
)

func HandleTemperature(w http.ResponseWriter, r *http.Request) {
	temperature := 0.0
	success := false

	// Thermal zones 0–3
	for i := 0; i < 4 && !success; i++ {
		tempPath := fmt.Sprintf("/sys/class/thermal/thermal_zone%d/temp", i)
		data, err := os.ReadFile(tempPath)
		if err != nil {
			continue
		}
		typePath := fmt.Sprintf("/sys/class/thermal/thermal_zone%d/type", i)
		typeData, _ := os.ReadFile(typePath)
		zoneType := strings.TrimSpace(string(typeData))

		var tempRaw int
		if _, err := fmt.Sscanf(string(data), "%d", &tempRaw); err != nil {
			continue
		}
		temp := float64(tempRaw) / 1000.0

		isCPU := strings.Contains(strings.ToLower(zoneType), "cpu") ||
			strings.Contains(strings.ToLower(zoneType), "soc")

		temperature = temp
		success = true
		if isCPU {
			break
		}
	}

	for i := 0; i < 4 && !success; i++ {
		tempPath := fmt.Sprintf("/sys/class/hwmon/hwmon%d/temp1_input", i)
		data, err := os.ReadFile(tempPath)
		if err != nil {
			continue
		}
		namePath := fmt.Sprintf("/sys/class/hwmon/hwmon%d/name", i)
		nameData, _ := os.ReadFile(namePath)
		sensorName := strings.TrimSpace(string(nameData))

		var tempRaw int
		if _, err := fmt.Sscanf(string(data), "%d", &tempRaw); err != nil {
			continue
		}
		temp := float64(tempRaw) / 1000.0

		isCPU := strings.Contains(strings.ToLower(sensorName), "cpu") ||
			strings.Contains(strings.ToLower(sensorName), "sunxi") ||
			strings.Contains(strings.ToLower(sensorName), "acpitz")

		temperature = temp
		success = true
		if isCPU {
			break
		}
	}

	if !success {
		fallbackPaths := []string{
			"/sys/class/hwmon/hwmon0/temp1_input",
			"/sys/class/hwmon/hwmon1/temp1_input",
			"/sys/class/hwmon/hwmon2/temp1_input",
			"/sys/class/hwmon/hwmon3/temp1_input",
		}
		for _, path := range fallbackPaths {
			data, err := os.ReadFile(path)
			if err != nil {
				continue
			}
			var tempRaw int
			if _, err := fmt.Sscanf(string(data), "%d", &tempRaw); err != nil {
				continue
			}
			temperature = float64(tempRaw) / 1000.0
			success = true
			break
		}
	}

	response := map[string]interface{}{
		"success":     success,
		"temperature": temperature,
		"unit":        "Celsius",
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(response)
}