#include "pch.h"
#include <gtest/gtest.h>
#include "DiffContext.h"
#include "PathContext.h"
#include "CompareEngines/ImageCompare.h"
#include "DiffWrapper.h"
#include <fstream>

namespace
{
	// The fixture for testing ImageCompare functions.
	class ImageCompareTest : public testing::Test
	{
	protected:
		ImageCompareTest() : m_pCtxt(nullptr)
		{
		}

		virtual ~ImageCompareTest()
		{
		}

		virtual void SetUp()
		{
			PathContext paths;
			paths.SetLeft(_T(""));
			paths.SetRight(_T(""));
			m_pCtxt.reset(new CDiffContext(paths, CMP_IMAGE_CONTENT));
		}

		virtual void TearDown()
		{
			m_pCtxt.reset();
		}

		std::unique_ptr<CDiffContext> m_pCtxt;
	};

#if 0
	// Test that ImageCompare can be instantiated
	TEST_F(ImageCompareTest, Construction)
	{
		CompareEngines::ImageCompare ic(*m_pCtxt);
		EXPECT_TRUE(true);
	}

	// Test with non-existent files (should return error)
	TEST_F(ImageCompareTest, NonExistentFiles)
	{
		CompareEngines::ImageCompare ic(*m_pCtxt);
		DIFFITEM di;

		// Set up non-existent files
		di.diffFileInfo[0].SetFile(_T("nonexistent1.png"));
		di.diffFileInfo[1].SetFile(_T("nonexistent2.png"));
		di.diffcode.setSideFlag(0);
		di.diffcode.setSideFlag(1);

		// Compare should detect that files don't exist or return error
		ic.CompareFiles(di);
		// Result could be DIFF or CMPERR depending on implementation
		EXPECT_TRUE(result == DIFFCODE::DIFF || result == DIFFCODE::CMPERR);
		EXPECT_EQ(result, di.diffcode.diffcode & (DIFFCODE::TYPEFLAGS | DIFFCODE::COMPAREFLAGS | DIFFCODE::COMPAREFLAGS3WAY));
	}

	// Test with one side missing (2-way comparison)
	TEST_F(ImageCompareTest, OneSideMissing_TwoWay)
	{
		CompareEngines::ImageCompare ic(*m_pCtxt);
		DIFFITEM di;

		// Left side exists, right side doesn't
		di.diffFileInfo[0].SetFile(_T("image1.png"));
		di.diffFileInfo[1].SetFile(_T("image2.png"));
		di.diffcode.setSideNone();
		di.diffcode.setSideFlag(0); // Only left side exists

		ic.CompareFiles(di);
		EXPECT_EQ(int(DIFFCODE::FILE|DIFFCODE::IMAGE|DIFFCODE::DIFF), di.diffcode.diffcode & (DIFFCODE::TYPEFLAGS | DIFFCODE::COMPAREFLAGS | DIFFCODE::COMPAREFLAGS3WAY));

		// Right side exists, left side doesn't
		di.diffcode.setSideNone();
		di.diffcode.setSideFlag(1); // Only right side exists

		ic.CompareFiles(di);
		EXPECT_EQ(int(DIFFCODE::FILE|DIFFCODE::IMAGE|DIFFCODE::DIFF), di.diffcode.diffcode & (DIFFCODE::TYPEFLAGS | DIFFCODE::COMPAREFLAGS | DIFFCODE::COMPAREFLAGS3WAY));
	}

	// Test with 3-way comparison where sides are missing
	TEST_F(ImageCompareTest, OneSideMissing_ThreeWay)
	{
		m_pCtxt.reset();
		PathContext paths;
		paths.SetLeft(_T(""));
		paths.SetMiddle(_T(""));
		paths.SetRight(_T(""));
		m_pCtxt.reset(new CDiffContext(paths, CMP_IMAGE_CONTENT));

		CompareEngines::ImageCompare ic(*m_pCtxt);
		DIFFITEM di;

		di.diffFileInfo[0].SetFile(_T("image1.png"));
		di.diffFileInfo[1].SetFile(_T("image2.png"));
		di.diffFileInfo[2].SetFile(_T("image3.png"));

		// Only middle and right exist
		di.diffcode.setSideNone();
		di.diffcode.setSideFlag(1);
		di.diffcode.setSideFlag(2);

		ic.CompareFiles(di);
		EXPECT_EQ(int(DIFFCODE::FILE|DIFFCODE::IMAGE|DIFFCODE::DIFF | DIFFCODE::DIFF1STONLY), di.diffcode.diffcode & (DIFFCODE::TYPEFLAGS | DIFFCODE::COMPAREFLAGS | DIFFCODE::COMPAREFLAGS3WAY));

		// Only left and right exist
		di.diffcode.setSideNone();
		di.diffcode.setSideFlag(0);
		di.diffcode.setSideFlag(2);

		ic.CompareFiles(di);
		EXPECT_EQ(int(DIFFCODE::FILE|DIFFCODE::IMAGE|DIFFCODE::DIFF | DIFFCODE::DIFF2NDONLY), di.diffcode.diffcode & (DIFFCODE::TYPEFLAGS | DIFFCODE::COMPAREFLAGS | DIFFCODE::COMPAREFLAGS3WAY));

		// Only left and middle exist
		di.diffcode.setSideNone();
		di.diffcode.setSideFlag(0);
		di.diffcode.setSideFlag(1);

		ic.CompareFiles(di);
		EXPECT_EQ(int(DIFFCODE::FILE|DIFFCODE::IMAGE|DIFFCODE::DIFF | DIFFCODE::DIFF3RDONLY), di.diffcode.diffcode & (DIFFCODE::TYPEFLAGS | DIFFCODE::COMPAREFLAGS | DIFFCODE::COMPAREFLAGS3WAY));
	}

	// Test with all sides missing (3-way)
	TEST_F(ImageCompareTest, AllSidesMissing_ThreeWay)
	{
		m_pCtxt.reset();
		PathContext paths;
		paths.SetLeft(_T(""));
		paths.SetMiddle(_T(""));
		paths.SetRight(_T(""));
		m_pCtxt.reset(new CDiffContext(paths, CMP_IMAGE_CONTENT));

		CompareEngines::ImageCompare ic(*m_pCtxt);
		DIFFITEM di;

		di.diffFileInfo[0].SetFile(_T("image1.png"));
		di.diffFileInfo[1].SetFile(_T("image2.png"));
		di.diffFileInfo[2].SetFile(_T("image3.png"));

		// No sides exist
		di.diffcode.setSideNone();

		ic.CompareFiles(di);
		// When no files exist, comparison should return DIFF
		EXPECT_EQ(int(DIFFCODE::FILE|DIFFCODE::IMAGE|DIFFCODE::DIFF), di.diffcode.diffcode & (DIFFCODE::TYPEFLAGS | DIFFCODE::COMPAREFLAGS | DIFFCODE::COMPAREFLAGS3WAY));
	}

	// Note: Testing actual image comparison would require:
	// 1. Valid image files (PNG, JPG, etc.)
	// 2. WinIMergeLib.dll to be available
	// 3. Test image assets
	// 
	// For now, we test the basic structure and error cases.
	// Full image comparison tests would need to be added when test assets are available.
#endif

}  // namespace

