package grpc

import (
	"context"
	"net/http"

	"github.com/grpc-ecosystem/grpc-gateway/runtime"
	"go.opentelemetry.io/otel/attribute"
	"go.opentelemetry.io/otel/trace"
	"google.golang.org/grpc"

	"gitea.libretechconsulting.com/rmcguire/go-app/pkg/srv/grpc/opts"
)

const API_PATH = "/api" // TODO: Make Configurable

// TODO: Add GetClientConn method to appGRPCServer that supports TLS, auth, etc..
// Will probably have to convert server opts to client opts
func (a *appGRPCServer) registerServiceGatewayHandlers(ctx context.Context, service *opts.GRPCService) {
	if len(service.GwRegistrationFuncs) < 1 {
		return
	} else if a.gatewayMux == nil {
		a.gatewayMux = runtime.NewServeMux()
	}

	ctx, span := a.tracer.Start(ctx, "appgrpc.init.prepare.service.gwHandlers", trace.WithAttributes(
		attribute.String("service", service.Name),
		attribute.Int("gwHandlers", len(service.GwRegistrationFuncs)),
	))
	defer span.End()

	// TODO: move to GetClientConn method which doesn't exist yet
	clientConn, _ := grpc.NewClient(a.opts.Listen)

	for _, registerGW := range service.GwRegistrationFuncs {
		registerGW(ctx, a.gatewayMux, clientConn)
	}
}

// Add our gateway mux to an existing http.ServeMux
func (a *appGRPCServer) mergeGatewayMuxWithHTTPMux(mux *http.ServeMux) {
	mux.Handle(API_PATH, http.StripPrefix(API_PATH, a.gatewayMux))
}