package settings

import (
	"dns_service/utils"
	"fmt"
	"os"
	"strconv"
)

func GetSettings() (map[string]any, error) {
	configPath := os.Getenv("DNSMASQ_CONFIG")
	if configPath == "" {
		return nil, fmt.Errorf("DNSMASQ_CONFIG environment variable not set")
	}

	data, err := os.ReadFile(configPath)
	if err != nil {
		return nil, fmt.Errorf("failed to read config file at %s: %w", configPath, err)
	}

	dnsmasqSettings := utils.DecodeSettings(string(data), "\n", "=")
	settings := make(map[string]any)

	// Parse cache size
	if cacheSizeStr, ok := dnsmasqSettings["cache-size"]; ok && cacheSizeStr != "" {
		cacheSize, err := strconv.ParseInt(cacheSizeStr, 10, 64)
		if err != nil {
			return nil, fmt.Errorf("failed to parse cache-size '%s': %w", cacheSizeStr, err)
		}
		settings["cache_size"] = cacheSize
	}

	// Read and parse resolv file
	if resolvFile, ok := dnsmasqSettings["resolv-file"]; ok {
		data, err := os.ReadFile(resolvFile)
		if err != nil {
			return nil, fmt.Errorf("failed to read resolv-file at %s: %w", resolvFile, err)
		}
		settings["resolv"] = utils.DecodeResolvs(string(data))
	}

	// Read and parse hosts file
	if hostsFile, ok := dnsmasqSettings["addn-hosts"]; ok {
		data, err := os.ReadFile(hostsFile)
		if err != nil {
			return nil, fmt.Errorf("failed to read addn-hosts file at %s: %w", hostsFile, err)
		}
		settings["hosts"] = utils.DecodeHosts(string(data))
	}

	return settings, nil
}