#include <QCommandLineParser>
#include <QFile>
#include <QFileInfo>
#include <QDebug>
#include <QRegularExpression>
#include <QSqlError>
#include "commanddelete.h"
#include "logger.h"

int CommandDelete::removeNonExistent(bool verbose, bool dryRun, QString pattern)
{
	int offset = 0;
	int limit = 1000;
	QVector<FileData> files;
	int processedRows = this->dbService->getFiles(files, pattern, 0, limit);
	while(processedRows > 0)
	{
		for(FileData &file : files)
		{
			QFileInfo fileInfo(file.absPath);
			if(!fileInfo.exists())
			{
				if(!dryRun)
				{
					if(this->dbService->deleteFile(file.absPath))
					{
						if(verbose)
						{
							Logger::info() << "Deleted" << file.absPath << endl;
						}
					}
					else
					{
						Logger::error() << "Failed to delete:" << file.absPath << ", exiting." << endl;
						return 1;
					}
				}
				else
				{
					Logger::info() << "Would delete " << file.absPath << endl;
				}
			}
		}

		offset += limit;
		processedRows = this->dbService->getFiles(files, pattern, offset, limit);
	}
	return 0;
}

int CommandDelete::removePaths(const QStringList &paths, bool verbose, bool dryRun)
{
	int result = 0;
	for(const QString &file : paths)
	{
		QFileInfo fileInfo(file);
		QString absPath = fileInfo.absoluteFilePath();
		if(this->dbService->fileExistsInDatabase(absPath))
		{
			if(!dryRun)
			{
				if(this->dbService->deleteFile(absPath))
				{
					if(verbose)
					{
						Logger::info() << "Deleted" << absPath << endl;
					}
				}
				else
				{
					Logger::error() << "Failed to delete:" << absPath << endl;
					result = 1;
				}
			}
		}
		else
		{
			Logger::error() << "No such file in database:" << absPath << endl;
			result = 1;
		}
	}
	return result;
}

int CommandDelete::handle(QStringList arguments)
{
	QCommandLineParser parser;
	parser.addOptions(
		{{{"v", "verbose"}, "Print path of the files while deleting them"},
		 {{"n", "dry-run"}, "Only print which files would be deleted from the database, don't delete them"},
		 {"pattern",
		  "Only delete files from index matching the pattern, e. g. */.git/*. Only applies to --deleted or standalone.",
		  "pattern"},
		 {"deleted", "Delete all files from the index that don't exist anymore"}});

	parser.addHelpOption();
	parser.addPositionalArgument("delete", "Delete paths from the index", "delete [paths...]");

	parser.process(arguments);
	bool verbose = parser.isSet("verbose");
	bool dryRun = parser.isSet("dry-run");
	QString pattern = parser.value("pattern");
	if(parser.isSet("deleted"))
	{

		int result = removeNonExistent(verbose, dryRun, pattern);
		if(result != 0)
		{
			return result;
		}
	}

	QStringList files = parser.positionalArguments();
	if(files.length() > 0)
	{
		int result = removePaths(files, verbose, dryRun);
		if(result != 0)
		{
			return result;
		}
	}

	return 0;
}