/* Copyright 2013-2018 MultiMC Contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#pragma once

#include <QObject>
#include <QUrl>
#include <memory>
#include <QNetworkReply>
#include <QObjectPtr.h>

#include "multimc_logic_export.h"

enum JobStatus
{
	Job_NotStarted,
	Job_InProgress,
	Job_Finished,
	Job_Failed,
	Job_Aborted,
	/*
	 * FIXME: @NUKE this confuses the task failing with us having a fallback in the form of local data. Clear up the confusion.
	 * Same could be true for aborted task - the presence of pre-existing result is a separate concern
	 */
	Job_Failed_Proceed
};

typedef std::shared_ptr<class NetAction> NetActionPtr;
class MULTIMC_LOGIC_EXPORT NetAction : public QObject
{
	Q_OBJECT
protected:
	explicit NetAction() : QObject(0) {};

public:
	virtual ~NetAction() {};

	bool isRunning() const
	{
		return m_status == Job_InProgress;
	}
	bool isFinished() const
	{
		return m_status >= Job_Finished;
	}
	bool wasSuccessful() const
	{
		return m_status == Job_Finished || m_status == Job_Failed_Proceed;
	}

	qint64 totalProgress() const
	{
		return m_total_progress;
	}
	qint64 currentProgress() const
	{
		return m_progress;
	}
	virtual bool abort()
	{
		return false;
	}
	virtual bool canAbort()
	{
		return false;
	}
	QUrl url()
	{
		return m_url;
	}

signals:
	void started(int index);
	void netActionProgress(int index, qint64 current, qint64 total);
	void succeeded(int index);
	void failed(int index);
	void aborted(int index);

protected slots:
	virtual void downloadProgress(qint64 bytesReceived, qint64 bytesTotal) = 0;
	virtual void downloadError(QNetworkReply::NetworkError error) = 0;
	virtual void downloadFinished() = 0;
	virtual void downloadReadyRead() = 0;

public slots:
	virtual void start() = 0;

public:
	/// index within the parent job, FIXME: nuke
	int m_index_within_job = 0;

	/// the network reply
	unique_qobject_ptr<QNetworkReply> m_reply;

	/// source URL
	QUrl m_url;

	qint64 m_progress = 0;
	qint64 m_total_progress = 1;

protected:
	JobStatus m_status = Job_NotStarted;
};