#include "nix/store/uds-remote-store.hh"
#include "nix/util/unix-domain-socket.hh"
#include "nix/store/worker-protocol.hh"
#include "nix/store/store-registration.hh"

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

#ifdef _WIN32
# include <winsock2.h>
# include <afunix.h>
#else
# include <sys/socket.h>
# include <sys/un.h>
#endif

namespace nix {

UDSRemoteStoreConfig::UDSRemoteStoreConfig(
    std::string_view scheme,
    std::string_view authority,
    const StoreReference::Params & params)
    : Store::Config{params}
    , LocalFSStore::Config{params}
    , RemoteStore::Config{params}
    , path{authority.empty() ? settings.nixDaemonSocketFile : authority}
{
    if (uriSchemes().count(scheme) == 0) {
        throw UsageError("Scheme must be 'unix'");
    }
}


std::string UDSRemoteStoreConfig::doc()
{
    return
        #include "uds-remote-store.md"
        ;
}


// A bit gross that we now pass empty string but this is knowing that
// empty string will later default to the same nixDaemonSocketFile. Why
// don't we just wire it all through? I believe there are cases where it
// will live reload so we want to continue to account for that.
UDSRemoteStoreConfig::UDSRemoteStoreConfig(const Params & params)
    : UDSRemoteStoreConfig(*uriSchemes().begin(), "", params)
{
}


UDSRemoteStore::UDSRemoteStore(ref<const Config> config)
    : Store{*config}
    , LocalFSStore{*config}
    , RemoteStore{*config}
    , config{config}
{
}


std::string UDSRemoteStore::getUri()
{
    return config->path == settings.nixDaemonSocketFile
        ? // FIXME: Not clear why we return daemon here and not default
          // to settings.nixDaemonSocketFile
          //
          // unix:// with no path also works. Change what we return?
          "daemon"
        : std::string(*Config::uriSchemes().begin()) + "://" + config->path;
}


void UDSRemoteStore::Connection::closeWrite()
{
    shutdown(toSocket(fd.get()), SHUT_WR);
}


ref<RemoteStore::Connection> UDSRemoteStore::openConnection()
{
    auto conn = make_ref<Connection>();

    /* Connect to a daemon that does the privileged work for us. */
    conn->fd = nix::connect(config->path);

    conn->from.fd = conn->fd.get();
    conn->to.fd = conn->fd.get();

    conn->startTime = std::chrono::steady_clock::now();

    return conn;
}


void UDSRemoteStore::addIndirectRoot(const Path & path)
{
    auto conn(getConnection());
    conn->to << WorkerProto::Op::AddIndirectRoot << path;
    conn.processStderr();
    readInt(conn->from);
}


ref<Store> UDSRemoteStore::Config::openStore() const {
    return make_ref<UDSRemoteStore>(ref{shared_from_this()});
}


static RegisterStoreImplementation<UDSRemoteStore::Config> regUDSRemoteStore;

}