package app

import dnscfgpkg "selective-vpn-api/app/dnscfg"

// ---------------------------------------------------------------------
// EN: `loadDNSMode` loads dns mode from storage or config.
// RU: `loadDNSMode` - загружает dns mode из хранилища или конфига.
// ---------------------------------------------------------------------
func loadDNSMode() DNSMode {
	st, needPersist := dnscfgpkg.LoadMode(dnscfgModeConfig())
	mode := DNSMode{
		ViaSmartDNS:  st.ViaSmartDNS,
		SmartDNSAddr: st.SmartDNSAddr,
		Mode:         DNSResolverMode(st.Mode),
	}
	if needPersist {
		_ = saveDNSMode(mode)
	}
	return mode
}

// ---------------------------------------------------------------------
// EN: `saveDNSMode` saves dns mode to persistent storage.
// RU: `saveDNSMode` - сохраняет dns mode в постоянное хранилище.
// ---------------------------------------------------------------------
func saveDNSMode(mode DNSMode) error {
	return dnscfgpkg.SaveMode(
		dnscfgModeConfig(),
		dnscfgpkg.ModeState{
			ViaSmartDNS:  mode.ViaSmartDNS,
			SmartDNSAddr: mode.SmartDNSAddr,
			Mode:         string(mode.Mode),
		},
	)
}

func dnscfgModeConfig() dnscfgpkg.ModeConfig {
	return dnscfgpkg.ModeConfig{
		Path:                dnsModePath,
		DirectMode:          string(DNSModeDirect),
		DefaultSmartDNSAddr: resolveDefaultSmartDNSAddr(),
		NormalizeResolverMode: func(mode string, viaSmartDNS bool) string {
			return string(normalizeDNSResolverMode(DNSResolverMode(mode), viaSmartDNS))
		},
		NormalizeSmartDNSAddr: normalizeSmartDNSAddr,
	}
}

// ---------------------------------------------------------------------
// EN: `normalizeDNSResolverMode` normalizes dns resolver mode values.
// RU: `normalizeDNSResolverMode` - нормализует значения режима dns резолвера.
// ---------------------------------------------------------------------
func normalizeDNSResolverMode(mode DNSResolverMode, viaSmartDNS bool) DNSResolverMode {
	return DNSResolverMode(
		dnscfgpkg.NormalizeResolverMode(
			string(mode),
			viaSmartDNS,
			string(DNSModeDirect),
			string(DNSModeSmartDNS),
			string(DNSModeHybridWildcard),
		),
	)
}