#include <QCommandLineParser>
#include <QFileInfo>
#include <QDateTime>
#include <QThreadPool>
#include "commandupdate.h"
#include "logger.h"

int CommandUpdate::handle(QStringList arguments)
{
	QCommandLineParser parser;
	parser.addOptions(
		{{{"v", "verbose"}, "Print path of the files while updating them"},
		 {{"n", "dry-run"}, "Only print which files would be updated, don't actually update them"},
		 {"pattern", "Only consider to update files in the index matching the pattern, e. g. */.git/*.", "pattern"},
		 {{"d", "delete"}, "If a file does not exist anymore, delete it"},
		 {{"c", "continue"},
		  "Continue adding files, don't exit on first error. If this option is not given, looqs will exit asap, but "
		  "it's possible that a few files will still be processed. "
		  "Set -t 1 to avoid this behavior, but processing will be slower."},
		 {{"a", "all"}, "On error, no files should be updated, even already processed ones"},
		 {{"t", "threads"}, "Number of threads to use.", "threads"}

		});

	parser.addHelpOption();
	parser.addPositionalArgument("update", "Checks files for changes and updates them", "update");

	parser.process(arguments);
	bool keepGoing = parser.isSet("continue");
	bool verbose = parser.isSet("verbose");
	bool deleteMissing = parser.isSet("delete");
	bool dryRun = parser.isSet("dry-run");
	QString pattern = parser.value("pattern");

	if(parser.isSet("all"))
	{
		throw LooqsGeneralException("To be implemented");
	}
	if(parser.isSet("threads"))
	{
		QString threadsCount = parser.value("threads");
		QThreadPool::globalInstance()->setMaxThreadCount(threadsCount.toInt());
	}
	FileSaver saver(*this->dbService);
	QVector<FileData> files;
	int offset = 0;
	int limit = 1000;
	int processedRows = dbService->getFiles(files, pattern, offset, limit);

	while(processedRows > 0)
	{
		QVector<QString> filePathsToUpdate;
		for(FileData &fileData : files)
		{
			QFileInfo fileInfo(fileData.absPath);
			if(fileInfo.exists() && fileInfo.isFile())
			{
				if(fileInfo.lastModified().toSecsSinceEpoch() != fileData.mtime)
				{
					if(!dryRun)
					{
						filePathsToUpdate.append(fileData.absPath);
					}
					else
					{
						Logger::info() << "Would update" << fileData.absPath << Qt::endl;
					}
				}
			}
			else
			{
				if(deleteMissing)
				{
					if(!dryRun)
					{
						if(!this->dbService->deleteFile(fileData.absPath))
						{
							Logger::error()
								<< "Error: Failed to delete" << fileData.absPath << "from databas" << Qt::endl;
							if(!keepGoing)
							{
								return 1;
							}
						}
						if(verbose)
						{
							Logger::info() << "Deleted" << fileData.absPath << Qt::endl;
						}
					}
					else
					{

						Logger::info() << "Would delete" << fileData.absPath << Qt::endl;
					}
				}
			}
		}

		int updatedFilesCount = saver.updateFiles(filePathsToUpdate, keepGoing, verbose);
		int shouldHaveUpdatedCount = filePathsToUpdate.size();
		if(updatedFilesCount != shouldHaveUpdatedCount)
		{
			if(!keepGoing)
			{
				Logger::error() << "Failed to update all files selected for updating. Updated" << updatedFilesCount
								<< "out of" << shouldHaveUpdatedCount << "selected for upating" << Qt::endl;
				return 1;
			}
		}
		offset += limit;
		files.clear();
		processedRows = this->dbService->getFiles(files, pattern, offset, limit);
	}

	return 0;
}