package config

import (
	"encoding/json"
	"errors"
	"fmt"
	"os"
)

type HealthchecksConfig struct {
	Enabled     bool   `json:"enabled"`
	HostPingAPI string `json:"host_ping_api"`
	PingKey     string `json:"ping_key"`
}

type Config struct {
	HealthchecksConfig `json:"healthchecks"`
	LeasesPath         string `json:"leases_path"`
}

func defaultConfig() *Config {
	return &Config{
		HealthchecksConfig: HealthchecksConfig{
			Enabled: false,
		},
		LeasesPath: "/var/lib/misc/dnsmasq.leases",
	}
}

func New(path string) (*Config, error) {
	fileContent, err := os.ReadFile(path)
	if err != nil {
		if errors.Is(err, os.ErrNotExist) {
			return defaultConfig(), nil
		}
		return nil, fmt.Errorf("failed to read config file %w", err)
	}

	var c Config
	if err := json.Unmarshal(fileContent, &c); err != nil {
		return nil, fmt.Errorf("failed to parse config file: %w", err)
	}
	return &c, nil
}