/* Copyright 2013-2019 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.
 */

#include "Task.h"

#include <QDebug>

Task::Task(QObject *parent) : QObject(parent)
{
}

void Task::setStatus(const QString &new_status)
{
    if(m_status != new_status)
    {
        m_status = new_status;
        emit status(m_status);
    }
}

void Task::setProgress(qint64 current, qint64 total)
{
    m_progress = current;
    m_progressTotal = total;
    emit progress(m_progress, m_progressTotal);
}

void Task::start()
{
    switch(m_state)
    {
        case State::Inactive:
        {
            qDebug() << "Task" << describe() << "starting for the first time";
            break;
        }
        case State::AbortedByUser:
        {
            qDebug() << "Task" << describe() << "restarting for after being aborted by user";
            break;
        }
        case State::Failed:
        {
            qDebug() << "Task" << describe() << "restarting for after failing at first";
            break;
        }
        case State::Succeeded:
        {
            qDebug() << "Task" << describe() << "restarting for after succeeding at first";
            break;
        }
        case State::Running:
        {
            qWarning() << "MultiMC tried to start task" << describe() << "while it was already running!";
            return;
        }
    }
    // NOTE: only fall thorugh to here in end states
    m_state = State::Running;
    emit started();
    executeTask();
}

void Task::emitFailed(QString reason)
{
    // Don't fail twice.
    if (!isRunning())
    {
        qCritical() << "Task" << describe() << "failed while not running!!!!: " << reason;
        return;
    }
    m_state = State::Failed;
    m_failReason = reason;
    qCritical() << "Task" << describe() << "failed: " << reason;
    emit failed(reason);
    emit finished();
}

void Task::emitAborted()
{
    // Don't abort twice.
    if (!isRunning())
    {
        qCritical() << "Task" << describe() << "aborted while not running!!!!";
        return;
    }
    m_state = State::AbortedByUser;
    m_failReason = "Aborted.";
    qDebug() << "Task" << describe() << "aborted.";
    emit failed(m_failReason);
    emit finished();
}

void Task::emitSucceeded()
{
    // Don't succeed twice.
    if (!isRunning())
    {
        qCritical() << "Task" << describe() << "succeeded while not running!!!!";
        return;
    }
    m_state = State::Succeeded;
    qDebug() << "Task" << describe() << "succeeded";
    emit succeeded();
    emit finished();
}

QString Task::describe()
{
    QString outStr;
    QTextStream out(&outStr);
    out << metaObject()->className() << QChar('(');
    auto name = objectName();
    if(name.isEmpty())
    {
        out << QString("0x%1").arg((quintptr)this, 0, 16);
    }
    else
    {
        out << name;
    }
    out << QChar(')');
    out.flush();
    return outStr;
}

bool Task::isRunning() const
{
    return m_state == State::Running;
}

bool Task::isFinished() const
{
    return m_state != State::Running && m_state != State::Inactive;
}

bool Task::wasSuccessful() const
{
    return m_state == State::Succeeded;
}

QString Task::failReason() const
{
    return m_failReason;
}

void Task::logWarning(const QString& line)
{
    qWarning() << line;
    m_Warnings.append(line);
}

QStringList Task::warnings() const
{
    return m_Warnings;
}