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

int CommandDelete::handle(QStringList arguments)
{
	QCommandLineParser parser;
	parser.addOptions({{{"v", "verbose"}, "Print path of the files while deleting them"},
					   {"pattern", "Only delete files from index matching the pattern, e. g. */.git/*", "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 removeNonExistant = parser.isSet("deleted");
	bool verbose = parser.isSet("verbose");
	QString pattern = parser.value("pattern");

	// TODO: port this to QRegularExpression once >5.12 gets more widespread because of this bug
	// https://bugreports.qt.io/browse/QTBUG-72539?focusedCommentId=439053&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel

	// QRegularExpression regexPattern = QRegularExpression::wildcardToRegularExpression(pattern);

	bool usePattern = !pattern.isEmpty();
	QRegExp regexPattern(pattern);
	regexPattern.setPatternSyntax(QRegExp::PatternSyntax::WildcardUnix);

	QSqlDatabase db = dbConnection();

	if(removeNonExistant)
	{
		// TODO: try to translate pattern to SQL WHERE
		QSqlQuery pathsQuery("SELECT path FROM file", db);
		if(!pathsQuery.exec())
		{
			qDebug() << "Failed to query current paths";
			return 1;
		}

		while(pathsQuery.next())
		{
			QString path = pathsQuery.value(0).toString();
			if(usePattern && regexPattern.exactMatch(path))
			{
				QFile file(path);
				if(!file.exists())
				{
					QSqlQuery query("DELETE FROM file WHERE path = ?", db);
					query.addBindValue(path);
					if(!query.exec())
					{
						qDebug() << "Failed to delete " << path << query.lastError();
						return 1;
					}
					if(verbose)
					{
						qInfo() << "Deleted " << path;
					}
				}
			}
		}
	}

	QStringList files = parser.positionalArguments();
	for(QString &file : files)
	{
		QFileInfo fileInfo(file);
		QString absPath = fileInfo.absoluteFilePath();
		if(fileExistsInDatabase(db, absPath))
		{
			QSqlQuery deletionQuery("DELETE FROM file WHERE path = ?", db);
			deletionQuery.addBindValue(absPath);
			if(deletionQuery.exec())
			{
				if(verbose)
				{
					qInfo() << "Deleted" << absPath;
				}
			}
			else
			{
				qDebug() << "Failed to delete:" << absPath << deletionQuery.lastError();
			}
		}
		else
		{
			qInfo() << "No such file in database:" << absPath;
		}
	}
	return 0;
}