// SPDX-License-Identifier: GPL-3.0-only
/*
 *  PolyMC - Minecraft Launcher
 *  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.
 */

#include "WorldListPage.h"
#include "ui_WorldListPage.h"
#include "minecraft/WorldList.h"

#include <QEvent>
#include <QMenu>
#include <QKeyEvent>
#include <QClipboard>
#include <QMessageBox>
#include <QTreeView>
#include <QInputDialog>
#include <QProcess>

#include "tools/MCEditTool.h"
#include "FileSystem.h"

#include "ui/GuiUtil.h"
#include "DesktopServices.h"

#include "Application.h"


class WorldListProxyModel : public QSortFilterProxyModel
{
    Q_OBJECT

public:
    WorldListProxyModel(QObject *parent) : QSortFilterProxyModel(parent) {}

    virtual QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const
    {
        QModelIndex sourceIndex = mapToSource(index);

        if (index.column() == 0 && role == Qt::DecorationRole)
        {
            WorldList *worlds = qobject_cast<WorldList *>(sourceModel());
            auto iconFile = worlds->data(sourceIndex, WorldList::IconFileRole).toString();
            if(iconFile.isNull()) {
                // NOTE: Minecraft uses the same placeholder for servers AND worlds
                return APPLICATION->getThemedIcon("unknown_server");
            }
            return QIcon(iconFile);
        }

        return sourceIndex.data(role);
    }
};


WorldListPage::WorldListPage(BaseInstance *inst, std::shared_ptr<WorldList> worlds, QWidget *parent)
    : QMainWindow(parent), m_inst(inst), ui(new Ui::WorldListPage), m_worlds(worlds)
{
    ui->setupUi(this);

    ui->toolBar->insertSpacer(ui->actionRefresh);

    WorldListProxyModel * proxy = new WorldListProxyModel(this);
    proxy->setSortCaseSensitivity(Qt::CaseInsensitive);
    proxy->setSourceModel(m_worlds.get());
    ui->worldTreeView->setSortingEnabled(true);
    ui->worldTreeView->setModel(proxy);
    ui->worldTreeView->installEventFilter(this);
    ui->worldTreeView->setContextMenuPolicy(Qt::CustomContextMenu);
    ui->worldTreeView->setIconSize(QSize(64,64));
    connect(ui->worldTreeView, &QTreeView::customContextMenuRequested, this, &WorldListPage::ShowContextMenu);

    auto head = ui->worldTreeView->header();
    head->setSectionResizeMode(0, QHeaderView::Stretch);
    head->setSectionResizeMode(1, QHeaderView::ResizeToContents);

    connect(ui->worldTreeView->selectionModel(), &QItemSelectionModel::currentChanged, this, &WorldListPage::worldChanged);
    worldChanged(QModelIndex(), QModelIndex());
}

void WorldListPage::openedImpl()
{
    m_worlds->startWatching();
}

void WorldListPage::closedImpl()
{
    m_worlds->stopWatching();
}

WorldListPage::~WorldListPage()
{
    m_worlds->stopWatching();
    delete ui;
}

void WorldListPage::ShowContextMenu(const QPoint& pos)
{
    auto menu = ui->toolBar->createContextMenu(this, tr("Context menu"));
    menu->exec(ui->worldTreeView->mapToGlobal(pos));
    delete menu;
}

QMenu * WorldListPage::createPopupMenu()
{
    QMenu* filteredMenu = QMainWindow::createPopupMenu();
    filteredMenu->removeAction( ui->toolBar->toggleViewAction() );
    return filteredMenu;
}

bool WorldListPage::shouldDisplay() const
{
    return true;
}

void WorldListPage::retranslate()
{
    ui->retranslateUi(this);
}

bool WorldListPage::worldListFilter(QKeyEvent *keyEvent)
{
    switch (keyEvent->key())
    {
    case Qt::Key_Delete:
        on_actionRemove_triggered();
        return true;
    default:
        break;
    }
    return QWidget::eventFilter(ui->worldTreeView, keyEvent);
}

bool WorldListPage::eventFilter(QObject *obj, QEvent *ev)
{
    if (ev->type() != QEvent::KeyPress)
    {
        return QWidget::eventFilter(obj, ev);
    }
    QKeyEvent *keyEvent = static_cast<QKeyEvent *>(ev);
    if (obj == ui->worldTreeView)
        return worldListFilter(keyEvent);
    return QWidget::eventFilter(obj, ev);
}

void WorldListPage::on_actionRemove_triggered()
{
    auto proxiedIndex = getSelectedWorld();

    if(!proxiedIndex.isValid())
        return;

    auto result = QMessageBox::question(this,
                tr("Are you sure?"),
                tr("This will remove the selected world permenantly.\n"
                    "The world will be gone forever (A LONG TIME).\n"
                    "\n"
                    "Do you want to continue?"));
    if(result != QMessageBox::Yes)
    {
        return;
    }
    m_worlds->stopWatching();
    m_worlds->deleteWorld(proxiedIndex.row());
    m_worlds->startWatching();
}

void WorldListPage::on_actionView_Folder_triggered()
{
    DesktopServices::openDirectory(m_worlds->dir().absolutePath(), true);
}

void WorldListPage::on_actionDatapacks_triggered()
{
    QModelIndex index = getSelectedWorld();

    if (!index.isValid())
    {
        return;
    }

    if(!worldSafetyNagQuestion())
        return;

    auto fullPath = m_worlds->data(index, WorldList::FolderRole).toString();

    DesktopServices::openDirectory(FS::PathCombine(fullPath, "datapacks"), true);
}


void WorldListPage::on_actionReset_Icon_triggered()
{
    auto proxiedIndex = getSelectedWorld();

    if(!proxiedIndex.isValid())
        return;

    if(m_worlds->resetIcon(proxiedIndex.row())) {
        ui->actionReset_Icon->setEnabled(false);
    }
}


QModelIndex WorldListPage::getSelectedWorld()
{
    auto index = ui->worldTreeView->selectionModel()->currentIndex();

    auto proxy = (QSortFilterProxyModel *) ui->worldTreeView->model();
    return proxy->mapToSource(index);
}

void WorldListPage::on_actionCopy_Seed_triggered()
{
    QModelIndex index = getSelectedWorld();

    if (!index.isValid())
    {
        return;
    }
    int64_t seed = m_worlds->data(index, WorldList::SeedRole).toLongLong();
    APPLICATION->clipboard()->setText(QString::number(seed));
}

void WorldListPage::on_actionMCEdit_triggered()
{
    if(m_mceditStarting)
        return;

    auto mcedit = APPLICATION->mcedit();

    const QString mceditPath = mcedit->path();

    QModelIndex index = getSelectedWorld();

    if (!index.isValid())
    {
        return;
    }

    if(!worldSafetyNagQuestion())
        return;

    auto fullPath = m_worlds->data(index, WorldList::FolderRole).toString();

    auto program = mcedit->getProgramPath();
    if(program.size())
    {
#ifdef Q_OS_WIN32
        if(!QProcess::startDetached(program, {fullPath}, mceditPath))
        {
            mceditError();
        }
#else
        m_mceditProcess.reset(new LoggedProcess());
        m_mceditProcess->setDetachable(true);
        connect(m_mceditProcess.get(), &LoggedProcess::stateChanged, this, &WorldListPage::mceditState);
        m_mceditProcess->start(program, {fullPath});
        m_mceditProcess->setWorkingDirectory(mceditPath);
        m_mceditStarting = true;
#endif
    }
    else
    {
        QMessageBox::warning(
            this->parentWidget(),
            tr("No MCEdit found or set up!"),
            tr("You do not have MCEdit set up or it was moved.\nYou can set it up in the global settings.")
        );
    }
}

void WorldListPage::mceditError()
{
    QMessageBox::warning(
        this->parentWidget(),
        tr("MCEdit failed to start!"),
        tr("MCEdit failed to start.\nIt may be necessary to reinstall it.")
    );
}

void WorldListPage::mceditState(LoggedProcess::State state)
{
    bool failed = false;
    switch(state)
    {
        case LoggedProcess::NotRunning:
        case LoggedProcess::Starting:
            return;
        case LoggedProcess::FailedToStart:
        case LoggedProcess::Crashed:
        case LoggedProcess::Aborted:
        {
            failed = true;
        }
        case LoggedProcess::Running:
        case LoggedProcess::Finished:
        {
            m_mceditStarting = false;
            break;
        }
    }
    if(failed)
    {
        mceditError();
    }
}

void WorldListPage::worldChanged(const QModelIndex &current, const QModelIndex &previous)
{
    QModelIndex index = getSelectedWorld();
    bool enable = index.isValid();
    ui->actionCopy_Seed->setEnabled(enable);
    ui->actionMCEdit->setEnabled(enable);
    ui->actionRemove->setEnabled(enable);
    ui->actionCopy->setEnabled(enable);
    ui->actionRename->setEnabled(enable);
    ui->actionDatapacks->setEnabled(enable);
    bool hasIcon = !index.data(WorldList::IconFileRole).isNull();
    ui->actionReset_Icon->setEnabled(enable && hasIcon);
}

void WorldListPage::on_actionAdd_triggered()
{
    auto list = GuiUtil::BrowseForFiles(
        displayName(),
        tr("Select a Minecraft world zip"),
        tr("Minecraft World Zip File (*.zip)"), QString(), this->parentWidget());
    if (!list.empty())
    {
        m_worlds->stopWatching();
        for (auto filename : list)
        {
            m_worlds->installWorld(QFileInfo(filename));
        }
        m_worlds->startWatching();
    }
}

bool WorldListPage::isWorldSafe(QModelIndex)
{
    return !m_inst->isRunning();
}

bool WorldListPage::worldSafetyNagQuestion()
{
    if(!isWorldSafe(getSelectedWorld()))
    {
        auto result = QMessageBox::question(this, tr("Copy World"), tr("Changing a world while Minecraft is running is potentially unsafe.\nDo you wish to proceed?"));
        if(result == QMessageBox::No)
        {
            return false;
        }
    }
    return true;
}


void WorldListPage::on_actionCopy_triggered()
{
    QModelIndex index = getSelectedWorld();
    if (!index.isValid())
    {
        return;
    }

    if(!worldSafetyNagQuestion())
        return;

    auto worldVariant = m_worlds->data(index, WorldList::ObjectRole);
    auto world = (World *) worldVariant.value<void *>();
    bool ok = false;
    QString name = QInputDialog::getText(this, tr("World name"), tr("Enter a new name for the copy."), QLineEdit::Normal, world->name(), &ok);

    if (ok && name.length() > 0)
    {
        world->install(m_worlds->dir().absolutePath(), name);
    }
}

void WorldListPage::on_actionRename_triggered()
{
    QModelIndex index = getSelectedWorld();
    if (!index.isValid())
    {
        return;
    }

    if(!worldSafetyNagQuestion())
        return;

    auto worldVariant = m_worlds->data(index, WorldList::ObjectRole);
    auto world = (World *) worldVariant.value<void *>();

    bool ok = false;
    QString name = QInputDialog::getText(this, tr("World name"), tr("Enter a new world name."), QLineEdit::Normal, world->name(), &ok);

    if (ok && name.length() > 0)
    {
        world->rename(name);
    }
}

void WorldListPage::on_actionRefresh_triggered()
{
    m_worlds->update();
}

#include "WorldListPage.moc"
