// Copyright 2024 Memgraph Ltd.
//
// Use of this software is governed by the Business Source License
// included in the file licenses/BSL.txt; by using this file, you agree to be bound by the terms of the Business Source
// License, and you may not use this file except in compliance with the Business Source License.
//
// As of the Change Date specified in that file, in accordance with
// the Business Source License, use of this software will be governed
// by the Apache License, Version 2.0, included in the file
// licenses/APL.txt.

#include "coordination/coordinator_config.hpp"
#include "nuraft/coordinator_state_machine.hpp"
#include "nuraft/raft_log_action.hpp"
#include "utils/file.hpp"
#include "utils/uuid.hpp"

#include <gflags/gflags.h>
#include <gtest/gtest.h>
#include "json/json.hpp"

using memgraph::coordination::CoordinatorClientConfig;
using memgraph::coordination::CoordinatorStateMachine;
using memgraph::coordination::RaftLogAction;
using memgraph::coordination::ReplClientInfo;
using memgraph::replication_coordination_glue::ReplicationMode;
using memgraph::utils::UUID;

class RaftLogSerialization : public ::testing::Test {
 protected:
  void SetUp() override {}

  void TearDown() override {}

  std::filesystem::path test_folder_{std::filesystem::temp_directory_path() / "MG_tests_unit_raft_log_serialization"};
};

TEST_F(RaftLogSerialization, ReplClientInfo) {
  ReplClientInfo info{"instance_name", ReplicationMode::SYNC, "127.0.0.1", 10111};

  nlohmann::json j = info;
  ReplClientInfo info2 = j.get<memgraph::coordination::ReplClientInfo>();

  ASSERT_EQ(info, info2);
}

TEST_F(RaftLogSerialization, CoordinatorClientConfig) {
  CoordinatorClientConfig config{"instance3",
                                 "127.0.0.1",
                                 10112,
                                 std::chrono::seconds{1},
                                 std::chrono::seconds{5},
                                 std::chrono::seconds{10},
                                 {"instance_name", ReplicationMode::ASYNC, "replication_ip_address", 10001},
                                 .ssl = std::nullopt};

  nlohmann::json j = config;
  CoordinatorClientConfig config2 = j.get<memgraph::coordination::CoordinatorClientConfig>();

  ASSERT_EQ(config, config2);
}

TEST_F(RaftLogSerialization, RaftLogActionRegister) {
  auto action = RaftLogAction::REGISTER_REPLICATION_INSTANCE;

  nlohmann::json j = action;
  RaftLogAction action2 = j.get<memgraph::coordination::RaftLogAction>();

  ASSERT_EQ(action, action2);
}

TEST_F(RaftLogSerialization, RaftLogActionUnregister) {
  auto action = RaftLogAction::UNREGISTER_REPLICATION_INSTANCE;

  nlohmann::json j = action;
  RaftLogAction action2 = j.get<memgraph::coordination::RaftLogAction>();

  ASSERT_EQ(action, action2);
}

TEST_F(RaftLogSerialization, RaftLogActionPromote) {
  auto action = RaftLogAction::SET_INSTANCE_AS_MAIN;

  nlohmann::json j = action;
  RaftLogAction action2 = j.get<memgraph::coordination::RaftLogAction>();

  ASSERT_EQ(action, action2);
}

TEST_F(RaftLogSerialization, RaftLogActionDemote) {
  auto action = RaftLogAction::SET_INSTANCE_AS_REPLICA;

  nlohmann::json j = action;
  RaftLogAction action2 = j.get<memgraph::coordination::RaftLogAction>();

  ASSERT_EQ(action, action2);
}

TEST_F(RaftLogSerialization, RaftLogActionUpdateUUID) {
  auto action = RaftLogAction::UPDATE_UUID;

  nlohmann::json j = action;
  RaftLogAction action2 = j.get<memgraph::coordination::RaftLogAction>();

  ASSERT_EQ(action, action2);
}

TEST_F(RaftLogSerialization, RegisterInstance) {
  CoordinatorClientConfig config{"instance3",
                                 "127.0.0.1",
                                 10112,
                                 std::chrono::seconds{1},
                                 std::chrono::seconds{5},
                                 std::chrono::seconds{10},
                                 {"instance_name", ReplicationMode::ASYNC, "replication_ip_address", 10001},
                                 .ssl = std::nullopt};

  auto buffer = CoordinatorStateMachine::SerializeRegisterInstance(config);
  auto [payload, action] = CoordinatorStateMachine::DecodeLog(*buffer);
  ASSERT_EQ(action, RaftLogAction::REGISTER_REPLICATION_INSTANCE);
  ASSERT_EQ(config, std::get<CoordinatorClientConfig>(payload));
}

TEST_F(RaftLogSerialization, UnregisterInstance) {
  auto buffer = CoordinatorStateMachine::SerializeUnregisterInstance("instance3");
  auto [payload, action] = CoordinatorStateMachine::DecodeLog(*buffer);
  ASSERT_EQ(action, RaftLogAction::UNREGISTER_REPLICATION_INSTANCE);
  ASSERT_EQ("instance3", std::get<std::string>(payload));
}

TEST_F(RaftLogSerialization, SetInstanceAsMain) {
  auto buffer = CoordinatorStateMachine::SerializeSetInstanceAsMain("instance3");
  auto [payload, action] = CoordinatorStateMachine::DecodeLog(*buffer);
  ASSERT_EQ(action, RaftLogAction::SET_INSTANCE_AS_MAIN);
  ASSERT_EQ("instance3", std::get<std::string>(payload));
}

TEST_F(RaftLogSerialization, SetInstanceAsReplica) {
  auto buffer = CoordinatorStateMachine::SerializeSetInstanceAsReplica("instance3");
  auto [payload, action] = CoordinatorStateMachine::DecodeLog(*buffer);
  ASSERT_EQ(action, RaftLogAction::SET_INSTANCE_AS_REPLICA);
  ASSERT_EQ("instance3", std::get<std::string>(payload));
}

TEST_F(RaftLogSerialization, UpdateUUID) {
  UUID uuid;
  auto buffer = CoordinatorStateMachine::SerializeUpdateUUID(uuid);
  auto [payload, action] = CoordinatorStateMachine::DecodeLog(*buffer);
  ASSERT_EQ(action, RaftLogAction::UPDATE_UUID);
  ASSERT_EQ(uuid, std::get<UUID>(payload));
}