#include "utilityGradle.h"

#include "DialogView.h"
#include "JavaEnvironment.h"
#include "JavaEnvironmentFactory.h"
#include "SourceGroupSettingsWithClasspath.h"
#include "ApplicationSettings.h"
#include "logging.h"
#include "MessageStatus.h"
#include "TextAccess.h"
#include "ResourcePaths.h"
#include "ScopedFunctor.h"
#include "utilityString.h"
#include "Application.h"

namespace utility
{
	std::vector<std::wstring> getRequiredJarNames()
	{
		return {
			L"gradle-tooling-api-4.2.jar",
			L"java-indexer.jar",
			L"org.eclipse.core.commands-3.9.200.jar",
			L"org.eclipse.core.contenttype-3.7.200.jar",
			L"org.eclipse.core.expressions-3.6.200.jar",
			L"org.eclipse.core.filesystem-1.7.200.jar",
			L"org.eclipse.core.jobs-3.10.200.jar",
			L"org.eclipse.core.resources-3.13.200.jar",
			L"org.eclipse.core.runtime-3.15.100.jar",
			L"org.eclipse.equinox.app-1.4.0.jar",
			L"org.eclipse.equinox.common-3.10.200.jar",
			L"org.eclipse.equinox.preferences-3.7.200.jar",
			L"org.eclipse.equinox.registry-3.8.200.jar",
			L"org.eclipse.jdt.core-3.13.102.jar",
			L"org.eclipse.osgi-3.13.200.jar",
			L"org.eclipse.text-3.8.0.jar",
			L"slf4j-api-1.7.10.jar",
			L"slf4j-simple-1.7.10.jar"
		};
	}

	std::string prepareJavaEnvironment()
	{
		std::string errorString;

		if (!JavaEnvironmentFactory::getInstance())
		{
#ifdef _WIN32
			const std::string separator = ";";
#else
			const std::string separator = ":";
#endif

			std::string classPath = "";
			{
				const std::vector<std::wstring> jarNames = getRequiredJarNames();
				for (size_t i = 0; i < jarNames.size(); i++)
				{
					if (i != 0)
					{
						classPath += separator;
					}
					classPath += ResourcePaths::getJavaPath().concatenate(L"lib/" + jarNames[i]).str();
				}
			}

			JavaEnvironmentFactory::createInstance(
				classPath,
				errorString
			);
		}

		return errorString;
	}

	bool prepareJavaEnvironmentAndDisplayOccurringErrors()
	{
		const std::wstring errorString = utility::decodeFromUtf8(utility::prepareJavaEnvironment());

		if (!errorString.empty())
		{
			LOG_ERROR(errorString);
			MessageStatus(errorString, true, false).dispatch();
		}

		if (!JavaEnvironmentFactory::getInstance())
		{
			std::wstring dialogMessage =
				L"Sourcetrail was unable to locate Java on this machine.\n"
				"Please make sure to provide the correct Java Path in the preferences.";

			if (!errorString.empty())
			{
				dialogMessage += L"\n\nError: " + errorString;
			}

			MessageStatus(dialogMessage, true, false).dispatch();

			Application::getInstance()->handleDialog(dialogMessage);
			return false;
		}
		return true;
	}

	std::set<FilePath> fetchRootDirectories(const std::set<FilePath>& sourceFilePaths)
	{
		std::shared_ptr<DialogView> dialogView = Application::getInstance()->getDialogView(DialogView::UseCase::PROJECT_SETUP);
		dialogView->showUnknownProgressDialog(L"Preparing Project", L"Gathering Root\nDirectories");

		ScopedFunctor dialogHider([&dialogView]() {
			dialogView->hideUnknownProgressDialog();
		});

		std::set<FilePath> rootDirectories;

		std::shared_ptr<JavaEnvironment> javaEnvironment = JavaEnvironmentFactory::getInstance()->createEnvironment();
		for (const FilePath& filePath : sourceFilePaths)
		{
			std::shared_ptr<TextAccess> textAccess = TextAccess::createFromFile(filePath);

			std::string packageName = "";
			javaEnvironment->callStaticStringMethod("com/sourcetrail/JavaIndexer", "getPackageName", packageName, textAccess->getText());

			if (packageName.empty())
			{
				continue;
			}

			FilePath rootPath = filePath.getParentDirectory();
			bool success = true;

			const std::vector<std::string> packageNameParts = utility::splitToVector(packageName, ".");
			for (std::vector<std::string>::const_reverse_iterator it = packageNameParts.rbegin(); it != packageNameParts.rend(); it++)
			{
				if (rootPath.fileName() != utility::decodeFromUtf8(*it))
				{
					success = false;
					break;
				}
				rootPath = rootPath.getParentDirectory();
			}

			if (success)
			{
				rootDirectories.insert(rootPath);
			}
		}

		return rootDirectories;
	}

	std::vector<FilePath> getClassPath(const std::vector<FilePath>& classpathItems, bool useJreSystemLibrary, const std::set<FilePath>& sourceFilePaths)
	{
		std::vector<FilePath> classPath;

		for (const FilePath& classpath : classpathItems)
		{
			if (classpath.exists())
			{
				LOG_INFO(L"Adding path to classpath: " + classpath.wstr());
				classPath.push_back(classpath);
			}
		}

		if (useJreSystemLibrary)
		{
			for (const FilePath& systemLibraryPath : ApplicationSettings::getInstance()->getJreSystemLibraryPathsExpanded())
			{
				LOG_INFO(L"Adding JRE system library path to classpath: " + systemLibraryPath.wstr());
				classPath.push_back(systemLibraryPath);
			}
		}

		for (const FilePath& rootDirectory : utility::fetchRootDirectories(sourceFilePaths))
		{
			if (rootDirectory.exists())
			{
				LOG_INFO(L"Adding root directory to classpath: " + rootDirectory.wstr());
				classPath.push_back(rootDirectory);
			}
		}

		return classPath;
	}
}