#include "workspace.hpp"

#include "session.hpp"

#include <QDebug>
#include <QDir>
#include <QFile>
#include <QFileInfo>
#include <QMimeDatabase>
#include <QStandardPaths>

namespace ZShell::llm {

Workspace::Workspace(ChatSession* session, QObject* parent)
	: QObject(parent), m_session(session) {
	m_path = pathFor(session->id());
}

QString Workspace::pathFor(const QString& sessionId) {
	const QString state =
		QStandardPaths::writableLocation(QStandardPaths::GenericStateLocation);
	return state + QStringLiteral("/zshell/sandboxes/") + sessionId;
}

bool Workspace::ensure() {
	return QDir().mkpath(m_path);
}

QList<Attachment*> Workspace::importFiles(
	const QStringList& paths, QString& error) {
	error.clear();
	if (!ensure()) {
		error = QStringLiteral("Could not create the sandbox directory");
		return {};
	}

	QMimeDatabase mimeDatabase;
	QList<Attachment*> result;
	for (const QString& rawPath : paths) {
		const QFileInfo info(rawPath);
		if (!info.exists() || !info.isFile()) {
			qWarning() << "Workspace: skipping" << rawPath
					   << ": file not found or not a file";
			error = QStringLiteral("File not found: %1").arg(info.fileName());
			continue;
		}

		const QString mimeType = mimeDatabase.mimeTypeForFile(info).name();
		const bool isImage =
			mimeType.startsWith(QLatin1String("image/"), Qt::CaseInsensitive);
		const qint64 cap = isImage ? MaxImageBytes : MaxFileBytes;
		if (info.size() > cap) {
			qWarning() << "Workspace: skipping" << rawPath << ": too large ("
					   << info.size() << "bytes, cap" << cap << ")";
			error = QStringLiteral("File too large: %1").arg(info.fileName());
			continue;
		}

		QString destination = m_path + QLatin1Char('/') + info.fileName();
		int suffix = 1;
		while (QFile::exists(destination)) {
			const QString extension = info.suffix().isEmpty()
										  ? QString()
										  : QLatin1Char('.') + info.suffix();
			destination = m_path + QLatin1Char('/') + info.completeBaseName() +
						  QStringLiteral("_%1%2").arg(suffix).arg(extension);
			++suffix;
		}

		if (!QFile::copy(info.absoluteFilePath(), destination)) {
			qWarning() << "Workspace: skipping" << rawPath << ": copy to"
					   << destination << "failed";
			error =
				QStringLiteral("Could not copy file: %1").arg(info.fileName());
			continue;
		}

		result.append(new Attachment(
			info.fileName(),
			destination,
			isImage ? Attachment::Kind::Image : Attachment::Kind::File,
			mimeType,
			info.size(),
			m_session));
	}
	return result;
}

} // namespace ZShell::llm