// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: MPL-2.0

package extensioncommon

import (
	envoy_core_v3 "github.com/envoyproxy/go-control-plane/envoy/config/core/v3"
	envoy_listener_v3 "github.com/envoyproxy/go-control-plane/envoy/config/listener/v3"
	envoy_http_v3 "github.com/envoyproxy/go-control-plane/envoy/extensions/filters/network/http_connection_manager/v3"
	envoy_tls_v3 "github.com/envoyproxy/go-control-plane/envoy/extensions/transport_sockets/tls/v3"
	"google.golang.org/protobuf/proto"
	"google.golang.org/protobuf/types/known/anypb"
)

// MakeUpstreamTLSTransportSocket generates an Envoy transport socket for the given TLS context.
func MakeUpstreamTLSTransportSocket(tlsContext *envoy_tls_v3.UpstreamTlsContext) (*envoy_core_v3.TransportSocket, error) {
	if tlsContext == nil {
		return nil, nil
	}
	return MakeTransportSocket("tls", tlsContext)
}

// MakeTransportSocket generates an Envoy transport socket from the given proto message.
func MakeTransportSocket(name string, config proto.Message) (*envoy_core_v3.TransportSocket, error) {
	any, err := anypb.New(config)
	if err != nil {
		return nil, err
	}
	return &envoy_core_v3.TransportSocket{
		Name: name,
		ConfigType: &envoy_core_v3.TransportSocket_TypedConfig{
			TypedConfig: any,
		},
	}, nil
}

// MakeEnvoyHTTPFilter generates an Envoy HTTP filter from the given proto message.
func MakeEnvoyHTTPFilter(name string, cfg proto.Message) (*envoy_http_v3.HttpFilter, error) {
	any, err := anypb.New(cfg)
	if err != nil {
		return nil, err
	}

	return &envoy_http_v3.HttpFilter{
		Name:       name,
		ConfigType: &envoy_http_v3.HttpFilter_TypedConfig{TypedConfig: any},
	}, nil
}

// MakeFilter generates an Envoy listener filter from the given proto message.
func MakeFilter(name string, cfg proto.Message) (*envoy_listener_v3.Filter, error) {
	any, err := anypb.New(cfg)
	if err != nil {
		return nil, err
	}

	return &envoy_listener_v3.Filter{
		Name:       name,
		ConfigType: &envoy_listener_v3.Filter_TypedConfig{TypedConfig: any},
	}, nil
}