// IACore-OSS; The Core Library for All IA Open Source Projects
// Copyright (C) 2026 IAS (ias@iasoft.dev)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include <IACore/IATest.hpp>
#include <IACore/SocketOps.hpp>

using namespace IACore;

IAT_BEGIN_BLOCK(Core, SocketOps)

// -------------------------------------------------------------------------
// 1. Initialization Logic
// -------------------------------------------------------------------------
auto test_initialization() -> bool {
  IAT_CHECK(SocketOps::is_initialized());

  // Increment ref count
  const auto res = SocketOps::initialize();
  IAT_CHECK(res.has_value());

  // Decrement ref count
  SocketOps::terminate();

  // Should still be initialized (ref count > 0)
  IAT_CHECK(SocketOps::is_initialized());

  return true;
}

// -------------------------------------------------------------------------
// 2. Port Availability Checks
// -------------------------------------------------------------------------
auto test_port_availability() -> bool {
  // We cannot easily guarantee a port is free or taken without binding it,
  // and SocketOps doesn't expose a generic TCP bind in its public API
  // (only Unix sockets).
  // However, we can verify the functions execute without crashing.

  const u16 port = 54321;

  // These return bools, we just ensure they run.
  (void)SocketOps::is_port_available_tcp(port);
  (void)SocketOps::is_port_available_udp(port);

  return true;
}

// -------------------------------------------------------------------------
// 3. Unix Domain Socket Lifecycle (Create, Bind, Listen, Connect)
// -------------------------------------------------------------------------
auto test_unix_socket_lifecycle() -> bool {
  const String socket_path = "iatest_ipc.sock";

  // Ensure clean state
  SocketOps::unlink_file(socket_path.c_str());

  // 1. Create Server Socket
  auto server_res = SocketOps::create_unix_socket();
  IAT_CHECK(server_res.has_value());
  SocketHandle server = *server_res;

  // 2. Bind
  auto bind_res = SocketOps::bind_unix_socket(server, socket_path.c_str());
  if (!bind_res) {
    // If bind fails (e.g. permissions), we clean up and fail the test
    SocketOps::close(server);
    return false;
  }

  // 3. Listen
  auto listen_res = SocketOps::listen(server);
  IAT_CHECK(listen_res.has_value());

  // 4. Create Client Socket
  auto client_res = SocketOps::create_unix_socket();
  IAT_CHECK(client_res.has_value());
  SocketHandle client = *client_res;

  // 5. Connect
  // Note: This relies on the OS backlog. We aren't calling accept() on the
  // server, but connect() should succeed if the server is listening.
  auto connect_res =
      SocketOps::connect_unix_socket(client, socket_path.c_str());
  IAT_CHECK(connect_res.has_value());

  // 6. Cleanup
  SocketOps::close(client);
  SocketOps::close(server);
  SocketOps::unlink_file(socket_path.c_str());

  return true;
}

// -------------------------------------------------------------------------
// 4. Unix Socket Error Handling
// -------------------------------------------------------------------------
auto test_unix_socket_errors() -> bool {
  const String socket_path = "iatest_missing.sock";

  // Ensure it doesn't exist
  SocketOps::unlink_file(socket_path.c_str());

  auto client_res = SocketOps::create_unix_socket();
  IAT_CHECK(client_res.has_value());
  SocketHandle client = *client_res;

  // Should fail to connect to non-existent file
  auto connect_res =
      SocketOps::connect_unix_socket(client, socket_path.c_str());
  IAT_CHECK_NOT(connect_res.has_value());

  SocketOps::close(client);

  return true;
}

// -------------------------------------------------------------------------
// Registration
// -------------------------------------------------------------------------
IAT_BEGIN_TEST_LIST()
IAT_ADD_TEST(test_initialization);
IAT_ADD_TEST(test_port_availability);
IAT_ADD_TEST(test_unix_socket_lifecycle);
IAT_ADD_TEST(test_unix_socket_errors);
IAT_END_TEST_LIST()

IAT_END_BLOCK()

IAT_REGISTER_ENTRY(Core, SocketOps)