#include <cstring>
#include <iostream>
#include <string>

#include "dpf/net/identity.hpp"

// Party identity keys for encrypted, authenticated party links.
//
//   c++ -std=c++17 -I include -I thirdparty examples/tools/dpf_keygen.cpp \
//       -lssl -lcrypto -o dpf_keygen
//   ./dpf_keygen p0.key            # new key file (mode 600); prints the public key
//   ./dpf_keygen --public p0.key   # public key of an existing key file
//
// Give each party its own key file (`identity = p0.key` in its config) and
// give the parties that should authenticate it the printed public key
// (`peer.0 = <public key>`).

int main(int argc, char ** argv)
{
    try
    {
        if (argc == 3 && std::strcmp(argv[1], "--public") == 0)
        {
            std::cout << dpf::net::identity::load(argv[2]).key().base64() << "\n";
            return 0;
        }
        if (argc == 2 && argv[1][0] != '-')
        {
            const auto id = dpf::net::identity::generate();
            id.save(argv[1]);
            std::cout << id.key().base64() << "\n";
            return 0;
        }
        std::cerr << "usage: dpf_keygen KEYFILE | dpf_keygen --public KEYFILE\n";
        return 2;
    }
    catch (const std::exception & e)
    {
        std::cerr << "dpf_keygen: " << e.what() << "\n";
        return 1;
    }
}