package config

import (
	"encoding/json"
	"os"
)

type Config struct {
	DHCP   DHCPConfig   `json:"dhcp"`
	DNS    DNSConfig    `json:"dns"`
	Web    WebConfig    `json:"web"`
	Database DatabaseConfig `json:"database"`
}

type DHCPConfig struct {
	Enabled          bool     `json:"enabled"`
	Interface        string   `json:"interface"`
	Network          string   `json:"network"`
	Netmask          string   `json:"netmask"`
	Gateway          string   `json:"gateway"`
	DNSServers       []string `json:"dns_servers"`
	NTPServers       []string `json:"ntp_servers"`
	BroadcastAddress string   `json:"broadcast_address"`
	LeaseTime        int      `json:"lease_time"` // seconds
	IPPoolStart      string   `json:"ip_pool_start"`
	IPPoolEnd        string   `json:"ip_pool_end"`
	DomainName       string   `json:"domain_name"`
	ExcludedIPs      []string `json:"excluded_ips"`
}

type DNSConfig struct {
	Enabled          bool     `json:"enabled"`
	ListenAddr       string   `json:"listen_addr"`
	ListenPort       int      `json:"listen_port"`
	Upstream         []string `json:"upstream"`
	CacheSize        int      `json:"cache_size"`
	CacheTTL         int      `json:"cache_ttl"`
	Recursion        bool     `json:"recursion"`
	AllowQuery       []string `json:"allow_query"`
	DNSSECValidation bool     `json:"dnssec_validation"`
}

type WebConfig struct {
	Host        string `json:"host"`
	Port        int    `json:"port"`
	SessionKey  string `json:"session_key"`
	EnableHTTPS bool   `json:"enable_https"`
	CertFile    string `json:"https_cert"`
	KeyFile     string `json:"https_key"`
}

type DatabaseConfig struct {
	Path string `json:"path"`
}

func LoadConfig(path string) (*Config, error) {
	data, err := os.ReadFile(path)
	if err != nil {
		return nil, err
	}

	var cfg Config
	if err := json.Unmarshal(data, &cfg); err != nil {
		return nil, err
	}

	return &cfg, nil
}

func (c *Config) Save(path string) error {
	data, err := json.MarshalIndent(c, "", "  ")
	if err != nil {
		return err
	}
	return os.WriteFile(path, data, 0644)
}