// SPDX-License-Identifier: GPL-3.0-only
/*
 *  PolyMC - Minecraft Launcher
 *  Copyright (C) 2022 Sefa Eyeoglu <contact@scrumplex.net>
 *  Copyright (c) 2022 Jamie Mansfield <jmansfield@cadixdev.org>
 *
 *  This program 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, version 3.
 *
 *  This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.
 *
 * This file incorporates work covered by the following copyright and
 * permission notice:
 *
 *      Copyright 2013-2021 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 <cassert>

#include <QObject>
#include "QObjectPtr.h"
#include <QDateTime>
#include <QSet>
#include <QProcess>

#include "settings/SettingsObject.h"

#include "settings/INIFile.h"
#include "BaseVersionList.h"
#include "minecraft/auth/MinecraftAccount.h"
#include "MessageLevel.h"
#include "pathmatcher/IPathMatcher.h"

#include "net/Mode.h"

#include "minecraft/launch/MinecraftServerTarget.h"
#include "RuntimeContext.h"

class QDir;
class Task;
class LaunchTask;
class BaseInstance;

// pointer for lazy people
typedef std::shared_ptr<BaseInstance> InstancePtr;

/*!
 * \brief Base class for instances.
 * This class implements many functions that are common between instances and
 * provides a standard interface for all instances.
 *
 * To create a new instance type, create a new class inheriting from this class
 * and implement the pure virtual functions.
 */
class BaseInstance : public QObject, public std::enable_shared_from_this<BaseInstance>
{
    Q_OBJECT
protected:
    /// no-touchy!
    BaseInstance(SettingsObjectPtr globalSettings, SettingsObjectPtr settings, const QString &rootDir);

public: /* types */
    enum class Status
    {
        Present,
        Gone // either nuked or invalidated
    };

public:
    /// virtual destructor to make sure the destruction is COMPLETE
    virtual ~BaseInstance() {};

    virtual void saveNow() = 0;

    /***
     * the instance has been invalidated - it is no longer tracked by the launcher for some reason,
     * but it has not necessarily been deleted.
     *
     * Happens when the instance folder changes to some other location, or the instance is removed by external means.
     */
    void invalidate();

    /// The instance's ID. The ID SHALL be determined by LAUNCHER internally. The ID IS guaranteed to
    /// be unique.
    virtual QString id() const;

    void setRunning(bool running);
    bool isRunning() const;
    int64_t totalTimePlayed() const;
    int64_t lastTimePlayed() const;
    void resetTimePlayed();

    /// get the type of this instance
    QString instanceType() const;

    /// Path to the instance's root directory.
    QString instanceRoot() const;

    /// Path to the instance's game root directory.
    virtual QString gameRoot() const
    {
        return instanceRoot();
    }

    /// Path to the instance's mods directory.
    virtual QString modsRoot() const = 0;

    QString name() const;
    void setName(QString val);

    /// Value used for instance window titles
    QString windowTitle() const;

    QString iconKey() const;
    void setIconKey(QString val);

    QString notes() const;
    void setNotes(QString val);

    QString getPreLaunchCommand();
    QString getPostExitCommand();
    QString getWrapperCommand();

    bool isManagedPack() const;
    QString getManagedPackType() const;
    QString getManagedPackID() const;
    QString getManagedPackName() const;
    QString getManagedPackVersionID() const;
    QString getManagedPackVersionName() const;
    void setManagedPack(const QString& type, const QString& id, const QString& name, const QString& versionId, const QString& version);
    void copyManagedPack(BaseInstance& other);

    /// guess log level from a line of game log
    virtual MessageLevel::Enum guessLevel([[maybe_unused]] const QString &line, MessageLevel::Enum level)
    {
        return level;
    };

    virtual QStringList extraArguments();

    /// Traits. Normally inside the version, depends on instance implementation.
    virtual QSet <QString> traits() const = 0;

    /**
     * Gets the time that the instance was last launched.
     * Stored in milliseconds since epoch.
     */
    qint64 lastLaunch() const;
    /// Sets the last launched time to 'val' milliseconds since epoch
    void setLastLaunch(qint64 val = QDateTime::currentMSecsSinceEpoch());

    /*!
     * \brief Gets this instance's settings object.
     * This settings object stores instance-specific settings.
     *
     * Note that this method is not const.
     * It may call loadSpecificSettings() to ensure those are loaded.
     *
     * \return A pointer to this instance's settings object.
     */
    virtual SettingsObjectPtr settings();

    /*!
     * \brief Loads settings specific to an instance type if they're not already loaded.
     */
    virtual void loadSpecificSettings() = 0;

    /// returns a valid update task
    virtual Task::Ptr createUpdateTask(Net::Mode mode) = 0;

    /// returns a valid launcher (task container)
    virtual shared_qobject_ptr<LaunchTask> createLaunchTask(
            AuthSessionPtr account, MinecraftServerTargetPtr serverToJoin) = 0;

    /// returns the current launch task (if any)
    shared_qobject_ptr<LaunchTask> getLaunchTask();

    /*!
     * Create envrironment variables for running the instance
     */
    virtual QProcessEnvironment createEnvironment() = 0;
    virtual QProcessEnvironment createLaunchEnvironment() = 0;

    /*!
     * Returns a matcher that can maps relative paths within the instance to whether they are 'log files'
     */
    virtual IPathMatcher::Ptr getLogFileMatcher() = 0;

    /*!
     * Returns the root folder to use for looking up log files
     */
    virtual QString getLogFileRoot() = 0;

    virtual QString getStatusbarDescription() = 0;

    /// FIXME: this really should be elsewhere...
    virtual QString instanceConfigFolder() const = 0;

    /// get variables this instance exports
    virtual QMap<QString, QString> getVariables() = 0;

    virtual QString typeName() const = 0;

    void updateRuntimeContext();
    RuntimeContext runtimeContext() const
    {
        return m_runtimeContext;
    }

    bool hasVersionBroken() const
    {
        return m_hasBrokenVersion;
    }
    void setVersionBroken(bool value)
    {
        if(m_hasBrokenVersion != value)
        {
            m_hasBrokenVersion = value;
            emit propertiesChanged(this);
        }
    }

    bool hasUpdateAvailable() const
    {
        return m_hasUpdate;
    }
    void setUpdateAvailable(bool value)
    {
        if(m_hasUpdate != value)
        {
            m_hasUpdate = value;
            emit propertiesChanged(this);
        }
    }

    bool hasCrashed() const
    {
        return m_crashed;
    }
    void setCrashed(bool value)
    {
        if(m_crashed != value)
        {
            m_crashed = value;
            emit propertiesChanged(this);
        }
    }

    virtual bool canLaunch() const;
    virtual bool canEdit() const = 0;
    virtual bool canExport() const = 0;

    bool reloadSettings();

    /**
     * 'print' a verbose description of the instance into a QStringList
     */
    virtual QStringList verboseDescription(AuthSessionPtr session, MinecraftServerTargetPtr serverToJoin) = 0;

    Status currentStatus() const;

    int getConsoleMaxLines() const;
    bool shouldStopOnConsoleOverflow() const;

    QStringList getLinkedInstances() const;
    void setLinkedInstances(const QStringList& list);
    void addLinkedInstanceId(const QString& id);
    bool removeLinkedInstanceId(const QString& id);
    bool isLinkedToInstanceId(const QString& id) const;

protected:
    void changeStatus(Status newStatus);

    SettingsObjectPtr globalSettings() const { return m_global_settings.lock(); };

    bool isSpecificSettingsLoaded() const { return m_specific_settings_loaded; }
    void setSpecificSettingsLoaded(bool loaded) { m_specific_settings_loaded = loaded; }

signals:
    /*!
     * \brief Signal emitted when properties relevant to the instance view change
     */
    void propertiesChanged(BaseInstance *inst);

    void launchTaskChanged(shared_qobject_ptr<LaunchTask>);

    void runningStatusChanged(bool running);

    void statusChanged(Status from, Status to);

protected slots:
    void iconUpdated(QString key);

protected: /* data */
    QString m_rootDir;
    SettingsObjectPtr m_settings;
    // InstanceFlags m_flags;
    bool m_isRunning = false;
    shared_qobject_ptr<LaunchTask> m_launchProcess;
    QDateTime m_timeStarted;
    RuntimeContext m_runtimeContext;

private: /* data */
    Status m_status = Status::Present;
    bool m_crashed = false;
    bool m_hasUpdate = false;
    bool m_hasBrokenVersion = false;

    SettingsObjectWeakPtr m_global_settings;
    bool m_specific_settings_loaded = false;

};

Q_DECLARE_METATYPE(shared_qobject_ptr<BaseInstance>)
//Q_DECLARE_METATYPE(BaseInstance::InstanceFlag)
//Q_DECLARE_OPERATORS_FOR_FLAGS(BaseInstance::InstanceFlags)