#include <memory>
#include <string>
#include <sstream>
#include <fstream>
#include <iostream>
#include <grpc++/grpc++.h>

#include "helloworld.grpc.pb.h"

using grpc::Server;
using grpc::ServerBuilder;
using grpc::ServerContext;
using grpc::Status;

using helloworld::HelloRequest;
using helloworld::HelloReply;
using helloworld::Greeter;

class GreeterServiceImpl final : public Greeter::Service
{
    Status SayHello ( ServerContext* context,
                          const HelloRequest* request,
                          HelloReply* reply ) override
    {
        std::string prefix ( "Hello " );

        reply->set_message ( prefix + request->name () );

        return Status::OK;
    }
};

void
read ( const std::string& filename, std::string& data )
{
        std::ifstream file ( filename.c_str (), std::ios::in );

    if ( file.is_open () )
    {
        std::stringstream ss;
        ss << file.rdbuf ();

        file.close ();

        data = ss.str ();
    }

    return;
}


void
runServer()
{
    /**
     * [!] Be carefull here using one cert with the CN != localhost. [!]
     **/
    std::string server_address ( "localhost:50051" );

    std::string key;
    std::string cert;
    std::string root;

    read ( "server.crt", cert );
    read ( "server.key", key );
    read ( "ca.crt", root );

    ServerBuilder builder;

    grpc::SslServerCredentialsOptions::PemKeyCertPair keycert =
    {
        key,
        cert
    };

    grpc::SslServerCredentialsOptions sslOps;
    sslOps.pem_root_certs = root;
    sslOps.pem_key_cert_pairs.push_back ( keycert );

    builder.AddListeningPort(server_address, grpc::SslServerCredentials( sslOps ));

    GreeterServiceImpl service;
    builder.RegisterService(&service);

    std::unique_ptr < Server > server ( builder.BuildAndStart () );
    std::cout << "Server listening on " << server_address << std::endl;

    server->Wait ();
}

int
main ( int argc, char** argv )
{
    runServer();

    return 0;
}