/*
 * Strawberry Music Player
 * This file was part of Clementine.
 * Copyright 2010, David Sansome <me@davidsansome.com>
 * Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
 *
 * Strawberry is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Strawberry is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef TASKMANAGER_H
#define TASKMANAGER_H

#include "config.h"

#include <QtGlobal>
#include <QObject>
#include <QMutex>
#include <QList>
#include <QMap>
#include <QString>

class TaskManager : public QObject {
  Q_OBJECT

 public:
  explicit TaskManager(QObject *parent = nullptr);

  struct Task {
    Task() : id(0), progress(0), progress_max(0), blocks_collection_scans(false) {}
    int id;
    QString name;
    qint64 progress;
    qint64 progress_max;
    bool blocks_collection_scans;
  };

  class ScopedTask {
   public:
    ScopedTask(const int task_id, TaskManager *task_manager) : task_id_(task_id), task_manager_(task_manager) {}

    ~ScopedTask() { task_manager_->SetTaskFinished(task_id_); }

   private:
    const int task_id_;
    TaskManager *task_manager_;

    Q_DISABLE_COPY(ScopedTask)
  };

  // Everything here is thread safe
  QList<Task> GetTasks();

  int StartTask(const QString &name);
  void SetTaskBlocksCollectionScans(const int id);
  void SetTaskProgress(const int id, const qint64 progress, const qint64 max = 0);
  void IncreaseTaskProgress(const int id, const qint64 progress, const qint64 max = 0);
  void SetTaskFinished(const int id);
  int GetTaskProgress(const int id);

 signals:
  void TasksChanged();

  void PauseCollectionWatchers();
  void ResumeCollectionWatchers();

 private:
  QMutex mutex_;
  QMap<int, Task> tasks_;
  int next_task_id_;

  Q_DISABLE_COPY(TaskManager)
};

#endif  // TASKMANAGER_H