#include "handler.hpp"
#include <filesystem>
#include <gmock/gmock.h>
#include <gtest/gtest.h>
#include <memory>

// Note: This is a demonstration of how to set up Google Mock for filesystem
// operations. To properly mock std::filesystem::exists, you would need to
// refactor handler.cpp to use dependency injection or create a filesystem
// wrapper interface.

// Mock interface for filesystem operations
/*
class IFilesystemWrapper {
public:
    virtual ~IFilesystemWrapper() = default;
    virtual bool exists(const std::filesystem::path& path) const = 0;
    virtual std::string read_file(const std::filesystem::path& path) const = 0;
};
*/

#include "handler.hpp"

// Mock implementation
class MockFilesystemWrapper : public IFilesystemWrapper {
public:
  MOCK_METHOD(bool, exists, (const std::filesystem::path &path),
              (const, override));
  MOCK_METHOD(std::string, read_file, (const std::filesystem::path &path),
              (const, override));
};

// Test fixture for demonstrating Google Mock setup
class ProcessMockTest : public ::testing::Test {
protected:
  void SetUp() override {
    mock_filesystem = std::make_unique<MockFilesystemWrapper>();
  }

  void TearDown() override { mock_filesystem.reset(); }

  std::unique_ptr<MockFilesystemWrapper> mock_filesystem;
};

// Test using the actual process function with mocked filesystem
TEST_F(ProcessMockTest, ProcessWithFileExists) {
  // Setup mock expectations
  EXPECT_CALL(*mock_filesystem, exists(::testing::_))
      .WillOnce(::testing::Return(true));

  EXPECT_CALL(*mock_filesystem, read_file(::testing::_))
      .WillOnce(::testing::Return("Mock file content\r\n"));

  // Test the actual process function with mocked filesystem
  std::string result = process("testuser", *mock_filesystem);
  EXPECT_EQ(result, "Mock file content\r\n");
}

// Test process function when file doesn't exist
TEST_F(ProcessMockTest, ProcessWithFileNotFound) {
  EXPECT_CALL(*mock_filesystem, exists(::testing::_))
      .WillOnce(::testing::Return(false));

  // Test the actual process function - should return username when file doesn't
  // exist
  std::string result = process("nonexistentuser", *mock_filesystem);
  EXPECT_EQ(result, "nonexistentuser");
}

// Test process function when file exists but is empty
TEST_F(ProcessMockTest, ProcessWithEmptyFile) {
  EXPECT_CALL(*mock_filesystem, exists(::testing::_))
      .WillOnce(::testing::Return(true));

  EXPECT_CALL(*mock_filesystem, read_file(::testing::_))
      .WillOnce(::testing::Return(""));

  // Test the actual process function - should return username when file is
  // empty
  std::string result = process("emptyfileuser", *mock_filesystem);
  EXPECT_EQ(result, "emptyfileuser");
}

// Test showing multiple expectations
TEST_F(ProcessMockTest, MultipleFileOperations) {
  using ::testing::_;
  using ::testing::Return;

  EXPECT_CALL(*mock_filesystem, exists(_))
      .Times(2)
      .WillOnce(Return(true))
      .WillOnce(Return(false));

  EXPECT_CALL(*mock_filesystem, read_file(_))
      .WillOnce(Return("First file content\r\n"));

  // Test multiple calls
  EXPECT_TRUE(mock_filesystem->exists("/path1"));
  EXPECT_EQ(mock_filesystem->read_file("/path1"), "First file content\r\n");
  EXPECT_FALSE(mock_filesystem->exists("/path2"));
}

/*
 * REFACTORING SUGGESTION:
 *
 * To properly mock std::filesystem::exists in your handler.cpp, consider:
 *
 * 1. Create a filesystem wrapper interface:
 *    class IFilesystemWrapper {
 *    public:
 *        virtual bool exists(const std::filesystem::path& path) const = 0;
 *        virtual std::string read_file(const std::filesystem::path& path) const
 * = 0;
 *    };
 *
 * 2. Modify process() function to accept the wrapper:
 *    std::string process(const std::string& username,
 *                       const IFilesystemWrapper& fs =
 * RealFilesystemWrapper{});
 *
 * 3. Use dependency injection in tests:
 *    MockFilesystemWrapper mock_fs;
 *    EXPECT_CALL(mock_fs, exists(_)).WillOnce(Return(true));
 *    std::string result = process("testuser", mock_fs);
 */

int main(int argc, char **argv) {
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
}