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#include "test/cpp/util/create_test_channel.h"

#include "test/core/end2end/data/ssl_test_data.h"
#include <grpc++/channel_arguments.h>
#include <grpc++/create_channel.h>
#include <grpc++/credentials.h>

namespace grpc {

// When ssl is enabled, if server is empty, override_hostname is used to
// create channel. Otherwise, connect to server and override hostname if
// override_hostname is provided.
// When ssl is not enabled, override_hostname is ignored.
// Set use_prod_root to true to use the SSL root for connecting to google.
// In this case, path to the roots pem file must be set via environment variable
// GRPC_DEFAULT_SSL_ROOTS_FILE_PATH.
// Otherwise, root for test SSL cert will be used.
// creds will be used to create a channel when enable_ssl is true.
// Use examples:
//   CreateTestChannel(
//       "1.1.1.1:12345", "override.hostname.com", true, false, creds);
//   CreateTestChannel("test.google.com:443", "", true, true, creds);
//   same as above
//   CreateTestChannel("", "test.google.com:443", true, true, creds);
std::shared_ptr<ChannelInterface> CreateTestChannel(
    const grpc::string& server, const grpc::string& override_hostname,
    bool enable_ssl, bool use_prod_roots,
    const std::unique_ptr<Credentials>& creds) {
  ChannelArguments channel_args;
  if (enable_ssl) {
    const char* roots_certs =
        use_prod_roots ? "" : test_root_cert;
    SslCredentialsOptions ssl_opts = {roots_certs, "", ""};

    std::unique_ptr<Credentials> channel_creds =
        CredentialsFactory::SslCredentials(ssl_opts);

    if (!server.empty() && !override_hostname.empty()) {
      channel_args.SetSslTargetNameOverride(override_hostname);
    }
    const grpc::string& connect_to =
        server.empty() ? override_hostname : server;
    if (creds.get()) {
      channel_creds =
          CredentialsFactory::ComposeCredentials(creds, channel_creds);
    }
    return CreateChannel(connect_to, channel_creds, channel_args);
  } else {
    return CreateChannelDeprecated(server, channel_args);
  }
}

std::shared_ptr<ChannelInterface> CreateTestChannel(
    const grpc::string& server, const grpc::string& override_hostname,
    bool enable_ssl, bool use_prod_roots) {
  return CreateTestChannel(server, override_hostname, enable_ssl,
                           use_prod_roots, std::unique_ptr<Credentials>());
}

// Shortcut for end2end and interop tests.
std::shared_ptr<ChannelInterface> CreateTestChannel(const grpc::string& server,
                                                    bool enable_ssl) {
  return CreateTestChannel(server, "foo.test.google.com", enable_ssl, false);
}

}  // namespace grpc