#include "infrastructure/repositories/FileUserRepository.h"
#include "domain/entities/User.h"
#include <catch2/catch_test_macros.hpp>
#include <catch2/matchers/catch_matchers_string.hpp>
#include <filesystem>
#include <fstream>
#include <optional>

using namespace nxl::autostore;
using Catch::Matchers::Equals;

namespace Test {
// Constants for magic strings and numbers
constexpr const char* TEST_USER_ID_1 = "user123";
constexpr const char* TEST_USER_ID_2 = "user456";
constexpr const char* TEST_USERNAME_1 = "testuser";
constexpr const char* TEST_USERNAME_2 = "anotheruser";
constexpr const char* TEST_PASSWORD_HASH_1 = "hashedpassword123";
constexpr const char* TEST_PASSWORD_HASH_2 = "hashedpassword456";
constexpr const char* NON_EXISTENT_ID = "nonexistent";
constexpr const char* NON_EXISTENT_USERNAME = "nonexistentuser";
constexpr const char* TEST_DIR_NAME = "autostore_test";
constexpr const char* TEST_DB_FILE_NAME = "test_users.json";

// Helper function to create a test user with default values
domain::User
createTestUser(const std::string& id = TEST_USER_ID_1,
               const std::string& username = TEST_USERNAME_1,
               const std::string& passwordHash = TEST_PASSWORD_HASH_1)
{
  domain::User user;
  user.id = id;
  user.username = username;
  user.passwordHash = passwordHash;
  return user;
}

// Helper function to create a second test user
domain::User createSecondTestUser()
{
  return createTestUser(TEST_USER_ID_2, TEST_USERNAME_2, TEST_PASSWORD_HASH_2);
}

// Helper function to set up test environment
std::string setupTestEnvironment()
{
  std::filesystem::path testDir =
    std::filesystem::temp_directory_path() / TEST_DIR_NAME;
  std::filesystem::create_directories(testDir);
  std::string testDbPath = (testDir / TEST_DB_FILE_NAME).string();

  // Clean up any existing test file
  if (std::filesystem::exists(testDbPath)) {
    std::filesystem::remove(testDbPath);
  }

  return testDbPath;
}

// Helper function to clean up test environment
void cleanupTestEnvironment()
{
  std::filesystem::path testDir =
    std::filesystem::temp_directory_path() / TEST_DIR_NAME;
  if (std::filesystem::exists(testDir)) {
    std::filesystem::remove_all(testDir);
  }
}

// Helper function to verify user properties match expected values
void verifyUserProperties(const domain::User& user,
                          const std::string& expectedId,
                          const std::string& expectedUsername,
                          const std::string& expectedPasswordHash)
{
  REQUIRE(user.id == expectedId);
  REQUIRE(user.username == expectedUsername);
  REQUIRE(user.passwordHash == expectedPasswordHash);
}

// Helper function to verify user properties match default test user values
void verifyDefaultTestUser(const domain::User& user)
{
  verifyUserProperties(user, TEST_USER_ID_1, TEST_USERNAME_1,
                       TEST_PASSWORD_HASH_1);
}

// Helper function to verify user properties match second test user values
void verifySecondTestUser(const domain::User& user)
{
  verifyUserProperties(user, TEST_USER_ID_2, TEST_USERNAME_2,
                       TEST_PASSWORD_HASH_2);
}
} // namespace Test

TEST_CASE("FileUserRepository Integration Tests",
          "[integration][FileUserRepository]")
{
  // Setup test environment
  std::string testDbPath = Test::setupTestEnvironment();

  SECTION("when a new user is saved then it can be found by id")
  {
    // Given
    infrastructure::FileUserRepository repository(testDbPath);
    domain::User testUser = Test::createTestUser();

    // When
    repository.save(testUser);

    // Then
    auto foundUser = repository.findById(Test::TEST_USER_ID_1);
    REQUIRE(foundUser.has_value());
    Test::verifyDefaultTestUser(*foundUser);
  }

  SECTION("when a new user is saved then it can be found by username")
  {
    // Given
    infrastructure::FileUserRepository repository(testDbPath);
    domain::User testUser = Test::createTestUser();

    // When
    repository.save(testUser);

    // Then
    auto foundUser = repository.findByUsername(Test::TEST_USERNAME_1);
    REQUIRE(foundUser.has_value());
    Test::verifyDefaultTestUser(*foundUser);
  }

  SECTION("when multiple users are saved then findAll returns all users")
  {
    // Given
    infrastructure::FileUserRepository repository(testDbPath);
    domain::User firstUser = Test::createTestUser();
    domain::User secondUser = Test::createSecondTestUser();

    // When
    repository.save(firstUser);
    repository.save(secondUser);

    // Then
    auto allUsers = repository.findAll();
    REQUIRE(allUsers.size() == 2);

    // Verify both users are present (order doesn't matter)
    bool foundFirst = false;
    bool foundSecond = false;

    for (const auto& user : allUsers) {
      if (user.id == Test::TEST_USER_ID_1) {
        Test::verifyDefaultTestUser(user);
        foundFirst = true;
      } else if (user.id == Test::TEST_USER_ID_2) {
        Test::verifySecondTestUser(user);
        foundSecond = true;
      }
    }

    REQUIRE(foundFirst);
    REQUIRE(foundSecond);
  }

  SECTION("when an existing user is saved then it is updated")
  {
    // Given
    infrastructure::FileUserRepository repository(testDbPath);
    domain::User testUser = Test::createTestUser();
    repository.save(testUser);

    // When
    testUser.username = "updatedusername";
    testUser.passwordHash = "updatedpasswordhash";
    repository.save(testUser);

    // Then
    auto foundUser = repository.findById(Test::TEST_USER_ID_1);
    REQUIRE(foundUser.has_value());
    REQUIRE(foundUser->id == Test::TEST_USER_ID_1);
    REQUIRE(foundUser->username == "updatedusername");
    REQUIRE(foundUser->passwordHash == "updatedpasswordhash");
  }

  SECTION("when a user is removed then it cannot be found by id")
  {
    // Given
    infrastructure::FileUserRepository repository(testDbPath);
    domain::User testUser = Test::createTestUser();
    repository.save(testUser);

    // When
    repository.remove(Test::TEST_USER_ID_1);

    // Then
    auto foundUser = repository.findById(Test::TEST_USER_ID_1);
    REQUIRE_FALSE(foundUser.has_value());
  }

  SECTION("when a user is removed then it cannot be found by username")
  {
    // Given
    infrastructure::FileUserRepository repository(testDbPath);
    domain::User testUser = Test::createTestUser();
    repository.save(testUser);

    // When
    repository.remove(Test::TEST_USER_ID_1);

    // Then
    auto foundUser = repository.findByUsername(Test::TEST_USERNAME_1);
    REQUIRE_FALSE(foundUser.has_value());
  }

  SECTION("when a user is removed then it is not in findAll")
  {
    // Given
    infrastructure::FileUserRepository repository(testDbPath);
    domain::User firstUser = Test::createTestUser();
    domain::User secondUser = Test::createSecondTestUser();
    repository.save(firstUser);
    repository.save(secondUser);

    // When
    repository.remove(Test::TEST_USER_ID_1);

    // Then
    auto allUsers = repository.findAll();
    REQUIRE(allUsers.size() == 1);
    Test::verifySecondTestUser(allUsers[0]);
  }

  SECTION(
    "when findById is called with non-existent id then it returns nullopt")
  {
    // Given
    infrastructure::FileUserRepository repository(testDbPath);

    // When
    auto foundUser = repository.findById(Test::NON_EXISTENT_ID);

    // Then
    REQUIRE_FALSE(foundUser.has_value());
  }

  SECTION("when findByUsername is called with non-existent username then it "
          "returns nullopt")
  {
    // Given
    infrastructure::FileUserRepository repository(testDbPath);

    // When
    auto foundUser = repository.findByUsername(Test::NON_EXISTENT_USERNAME);

    // Then
    REQUIRE_FALSE(foundUser.has_value());
  }

  SECTION("when remove is called with non-existent id then it does nothing")
  {
    // Given
    infrastructure::FileUserRepository repository(testDbPath);
    domain::User testUser = Test::createTestUser();
    repository.save(testUser);

    // When
    repository.remove(Test::NON_EXISTENT_ID);

    // Then
    auto allUsers = repository.findAll();
    REQUIRE(allUsers.size() == 1);
    Test::verifyDefaultTestUser(allUsers[0]);
  }

  SECTION(
    "when repository is created with existing data file then it loads the data")
  {
    // Given
    {
      infrastructure::FileUserRepository firstRepository(testDbPath);
      domain::User testUser = Test::createTestUser();
      firstRepository.save(testUser);
    }

    // When
    infrastructure::FileUserRepository secondRepository(testDbPath);

    // Then
    auto foundUser = secondRepository.findById(Test::TEST_USER_ID_1);
    REQUIRE(foundUser.has_value());
    Test::verifyDefaultTestUser(*foundUser);
  }

  SECTION("when repository is created with non-existent data file then it "
          "starts empty")
  {
    // Given
    std::filesystem::path testDir =
      std::filesystem::temp_directory_path() / Test::TEST_DIR_NAME;
    std::string nonExistentDbPath = (testDir / "nonexistent.json").string();

    // When
    infrastructure::FileUserRepository repository(nonExistentDbPath);

    // Then
    auto allUsers = repository.findAll();
    REQUIRE(allUsers.empty());
  }

  // Clean up test environment
  Test::cleanupTestEnvironment();
}