package api

import (
	"dns_service/utils"
	"io"
	"net/http"
	"os"
)

func SettingsFile(w http.ResponseWriter, req *http.Request) {
	configPath := os.Getenv("DNSMASQ_CONFIG")
	if configPath == "" {
		http.Error(w, "DNSMASQ_CONFIG environment variable not set", http.StatusInternalServerError)
		return
	}

	switch req.Method {
	case "GET":
		data, err := os.ReadFile(configPath)
		if err != nil {
			http.Error(w, "failed to read dnsmasq config file", http.StatusInternalServerError)
			return
		}
		w.Header().Set("Content-Type", "text/plain")
		w.Write(data)
	case "POST":
		bodyBytes, err := io.ReadAll(req.Body)
		if err != nil {
			http.Error(w, "failed to read request body", http.StatusBadRequest)
			return
		}
		if err := os.WriteFile(configPath, bodyBytes, 0644); err != nil {
			http.Error(w, "failed to write dnsmasq config file", http.StatusInternalServerError)
			return
		}
		if err := utils.RestartDnsmasq(); err != nil {
			http.Error(w, "failed to restart dnsmasq", http.StatusInternalServerError)
			return
		}
		w.Header().Set("Content-Type", "text/plain")
		w.Write(bodyBytes)
	default:
		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
	}
}