package app

import (
	"fmt"
)

// ---------------------------------------------------------------------
// smartdns runtime accelerator (nftset -> agvpn_dyn4)
// ---------------------------------------------------------------------

// EN: Runtime accelerator state is persisted separately from DNS mode.
// EN: This allows enabling/disabling SmartDNS nftset hook without changing
// EN: resolver primary behavior.
// RU: Состояние runtime-ускорителя хранится отдельно от DNS mode.
// RU: Это позволяет включать/выключать SmartDNS nftset-hook независимо от
// RU: основного пути через резолвер.

const (
	smartdnsRuntimeDomainSetLine = "domain-set -name agvpn_wild -file /etc/selective-vpn/smartdns.conf"
	smartdnsRuntimeNftsetLine    = "nftset /domain-set:agvpn_wild/#4:inet#agvpn#agvpn_dyn4"
	smartdnsRuntimeStateVersion  = 1
)

type smartDNSRuntimeState struct {
	Version   int    `json:"version"`
	Enabled   bool   `json:"enabled"`
	UpdatedAt string `json:"updated_at"`
}

func wildcardFillSource(runtimeEnabled bool) string {
	if runtimeEnabled {
		return "both"
	}
	return "resolver"
}

func smartDNSRuntimeSnapshot() SmartDNSRuntimeStatusResponse {
	st := loadSmartDNSRuntimeState(nil)
	appliedEnabled, err := smartDNSRuntimeEnabledFromConfig()
	msg := ""
	if err != nil {
		msg = fmt.Sprintf("config read error: %v", err)
	}
	return SmartDNSRuntimeStatusResponse{
		Enabled:        st.Enabled,
		AppliedEnable:  appliedEnabled,
		WildcardSource: wildcardFillSource(st.Enabled),
		UnitState:      smartdnsUnitState(),
		ConfigPath:     smartdnsMainConfig,
		Message:        msg,
	}
}