// SPDX-License-Identifier: GPL-3.0-only
/*
 *  Prism Launcher - Minecraft Launcher
 *  Copyright (C) 2022 Sefa Eyeoglu <contact@scrumplex.net>
 *  Copyright (C) 2022 TheKodeToad <TheKodeToad@proton.me>
 *
 *  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/>.
 */

#include "ResourceDownloadDialog.h"
#include <QEventLoop>
#include <QList>

#include <QPushButton>
#include <algorithm>

#include "Application.h"
#include "ResourceDownloadTask.h"

#include "minecraft/mod/ModFolderModel.h"
#include "minecraft/mod/ResourcePackFolderModel.h"
#include "minecraft/mod/ShaderPackFolderModel.h"
#include "minecraft/mod/TexturePackFolderModel.h"

#include "minecraft/mod/tasks/GetModDependenciesTask.h"
#include "modplatform/ModIndex.h"
#include "ui/dialogs/CustomMessageBox.h"
#include "ui/dialogs/ProgressDialog.h"
#include "ui/dialogs/ReviewMessageBox.h"

#include "ui/pages/modplatform/ResourcePage.h"

#include "ui/pages/modplatform/flame/FlameResourcePages.h"
#include "ui/pages/modplatform/modrinth/ModrinthResourcePages.h"

#include "ui/widgets/PageContainer.h"

namespace ResourceDownload {

ResourceDownloadDialog::ResourceDownloadDialog(QWidget* parent, const std::shared_ptr<ResourceFolderModel> base_model)
    : QDialog(parent)
    , m_base_model(base_model)
    , m_buttons(QDialogButtonBox::Help | QDialogButtonBox::Ok | QDialogButtonBox::Cancel)
    , m_vertical_layout(this)
{
    setObjectName(QStringLiteral("ResourceDownloadDialog"));

    resize(std::max(0.5 * parent->width(), 400.0), std::max(0.75 * parent->height(), 400.0));

    setWindowIcon(APPLICATION->getThemedIcon("new"));

    // Bonk Qt over its stupid head and make sure it understands which button is the default one...
    // See: https://stackoverflow.com/questions/24556831/qbuttonbox-set-default-button
    auto OkButton = m_buttons.button(QDialogButtonBox::Ok);
    OkButton->setEnabled(false);
    OkButton->setDefault(true);
    OkButton->setAutoDefault(true);
    OkButton->setText(tr("Review and confirm"));
    OkButton->setShortcut(tr("Ctrl+Return"));

    auto CancelButton = m_buttons.button(QDialogButtonBox::Cancel);
    CancelButton->setDefault(false);
    CancelButton->setAutoDefault(false);

    auto HelpButton = m_buttons.button(QDialogButtonBox::Help);
    HelpButton->setDefault(false);
    HelpButton->setAutoDefault(false);

    setWindowModality(Qt::WindowModal);
}

void ResourceDownloadDialog::accept()
{
    if (!geometrySaveKey().isEmpty())
        APPLICATION->settings()->set(geometrySaveKey(), saveGeometry().toBase64());

    QDialog::accept();
}

void ResourceDownloadDialog::reject()
{
    if (!geometrySaveKey().isEmpty())
        APPLICATION->settings()->set(geometrySaveKey(), saveGeometry().toBase64());

    QDialog::reject();
}

// NOTE: We can't have this in the ctor because PageContainer calls a virtual function, and so
// won't work with subclasses if we put it in this ctor.
void ResourceDownloadDialog::initializeContainer()
{
    m_container = new PageContainer(this, {}, this);
    m_container->setSizePolicy(QSizePolicy::Policy::Preferred, QSizePolicy::Policy::Expanding);
    m_container->layout()->setContentsMargins(0, 0, 0, 0);
    m_vertical_layout.addWidget(m_container);

    m_container->addButtons(&m_buttons);

    connect(m_container, &PageContainer::selectedPageChanged, this, &ResourceDownloadDialog::selectedPageChanged);
}

void ResourceDownloadDialog::connectButtons()
{
    auto OkButton = m_buttons.button(QDialogButtonBox::Ok);
    OkButton->setToolTip(
        tr("Opens a new popup to review your selected %1 and confirm your selection. Shortcut: Ctrl+Return").arg(resourcesString()));
    connect(OkButton, &QPushButton::clicked, this, &ResourceDownloadDialog::confirm);

    auto CancelButton = m_buttons.button(QDialogButtonBox::Cancel);
    connect(CancelButton, &QPushButton::clicked, this, &ResourceDownloadDialog::reject);

    auto HelpButton = m_buttons.button(QDialogButtonBox::Help);
    connect(HelpButton, &QPushButton::clicked, m_container, &PageContainer::help);
}

static ModPlatform::ProviderCapabilities ProviderCaps;

QStringList getRequiredBy(QList<ResourceDownloadDialog::DownloadTaskPtr> tasks, ResourceDownloadDialog::DownloadTaskPtr pack)
{
    auto addonId = pack->getPack()->addonId;
    auto provider = pack->getPack()->provider;
    auto version = pack->getVersionID();
    auto req = QStringList();
    for (auto& task : tasks) {
        if (provider != task->getPack()->provider)
            continue;
        auto deps = task->getVersion().dependencies;
        if (auto dep = std::find_if(deps.begin(), deps.end(),
                                    [addonId, provider, version](const ModPlatform::Dependency& d) {
                                        return d.type == ModPlatform::DependencyType::REQUIRED &&
                                               (provider == ModPlatform::ResourceProvider::MODRINTH && d.addonId.toString().isEmpty()
                                                    ? version == d.version
                                                    : d.addonId == addonId);
                                    });
            dep != deps.end()) {
            req.append(task->getName());
        }
    }
    return req;
}

void ResourceDownloadDialog::confirm()
{
    auto confirm_dialog = ReviewMessageBox::create(this, tr("Confirm %1 to download").arg(resourcesString()));
    confirm_dialog->retranslateUi(resourcesString());

    if (auto task = getModDependenciesTask(); task) {
        connect(task.get(), &Task::failed, this,
                [&](QString reason) { CustomMessageBox::selectable(this, tr("Error"), reason, QMessageBox::Critical)->exec(); });

        connect(task.get(), &Task::succeeded, this, [&]() {
            QStringList warnings = task->warnings();
            if (warnings.count()) {
                CustomMessageBox::selectable(this, tr("Warnings"), warnings.join('\n'), QMessageBox::Warning)->exec();
            }
        });

        // Check for updates
        ProgressDialog progress_dialog(this);
        progress_dialog.setSkipButton(true, tr("Abort"));
        progress_dialog.setWindowTitle(tr("Checking for dependencies..."));
        auto ret = progress_dialog.execWithTask(task.get());

        // If the dialog was skipped / some download error happened
        if (ret == QDialog::DialogCode::Rejected) {
            QMetaObject::invokeMethod(this, "reject", Qt::QueuedConnection);
            return;
        } else {
            for (auto dep : task->getDependecies())
                addResource(dep->pack, dep->version);
        }
    }

    auto selected = getTasks();
    std::sort(selected.begin(), selected.end(), [](const DownloadTaskPtr& a, const DownloadTaskPtr& b) {
        return QString::compare(a->getName(), b->getName(), Qt::CaseInsensitive) < 0;
    });
    for (auto& task : selected) {
        confirm_dialog->appendResource({ task->getName(), task->getFilename(), task->getCustomPath(),
                                         ProviderCaps.name(task->getProvider()), getRequiredBy(selected, task) });
    }

    if (confirm_dialog->exec()) {
        auto deselected = confirm_dialog->deselectedResources();
        for (auto page : m_container->getPages()) {
            auto res = static_cast<ResourcePage*>(page);
            for (auto name : deselected)
                res->removeResourceFromPage(name);
        }

        this->accept();
    }
}

bool ResourceDownloadDialog::selectPage(QString pageId)
{
    return m_container->selectPage(pageId);
}

ResourcePage* ResourceDownloadDialog::getSelectedPage()
{
    return m_selectedPage;
}

void ResourceDownloadDialog::addResource(ModPlatform::IndexedPack::Ptr pack, ModPlatform::IndexedVersion& ver)
{
    removeResource(pack->name);
    m_selectedPage->addResourceToPage(pack, ver, getBaseModel());
    setButtonStatus();
}

void ResourceDownloadDialog::removeResource(const QString& pack_name)
{
    for (auto page : m_container->getPages()) {
        static_cast<ResourcePage*>(page)->removeResourceFromPage(pack_name);
    }
    setButtonStatus();
}

void ResourceDownloadDialog::setButtonStatus()
{
    auto selected = false;
    for (auto page : m_container->getPages()) {
        auto res = static_cast<ResourcePage*>(page);
        selected = selected || res->hasSelectedPacks();
    }
    m_buttons.button(QDialogButtonBox::Ok)->setEnabled(selected);
}

const QList<ResourceDownloadDialog::DownloadTaskPtr> ResourceDownloadDialog::getTasks()
{
    QList<DownloadTaskPtr> selected;
    for (auto page : m_container->getPages()) {
        auto res = static_cast<ResourcePage*>(page);
        selected.append(res->selectedPacks());
    }
    return selected;
}

void ResourceDownloadDialog::selectedPageChanged(BasePage* previous, BasePage* selected)
{
    auto* prev_page = dynamic_cast<ResourcePage*>(previous);
    if (!prev_page) {
        qCritical() << "Page '" << previous->displayName() << "' in ResourceDownloadDialog is not a ResourcePage!";
        return;
    }

    m_selectedPage = dynamic_cast<ResourcePage*>(selected);
    if (!m_selectedPage) {
        qCritical() << "Page '" << selected->displayName() << "' in ResourceDownloadDialog is not a ResourcePage!";
        return;
    }

    // Same effect as having a global search bar
    m_selectedPage->setSearchTerm(prev_page->getSearchTerm());
}

ModDownloadDialog::ModDownloadDialog(QWidget* parent, const std::shared_ptr<ModFolderModel>& mods, BaseInstance* instance)
    : ResourceDownloadDialog(parent, mods), m_instance(instance)
{
    setWindowTitle(dialogTitle());

    initializeContainer();
    connectButtons();

    if (!geometrySaveKey().isEmpty())
        restoreGeometry(QByteArray::fromBase64(APPLICATION->settings()->get(geometrySaveKey()).toByteArray()));
}

QList<BasePage*> ModDownloadDialog::getPages()
{
    QList<BasePage*> pages;

    pages.append(ModrinthModPage::create(this, *m_instance));
    if (APPLICATION->capabilities() & Application::SupportsFlame)
        pages.append(FlameModPage::create(this, *m_instance));

    m_selectedPage = dynamic_cast<ModPage*>(pages[0]);

    return pages;
}

GetModDependenciesTask::Ptr ModDownloadDialog::getModDependenciesTask()
{
    if (auto model = dynamic_cast<ModFolderModel*>(getBaseModel().get()); model) {
        QList<std::shared_ptr<GetModDependenciesTask::PackDependency>> selectedVers;
        for (auto& selected : getTasks()) {
            selectedVers.append(std::make_shared<GetModDependenciesTask::PackDependency>(selected->getPack(), selected->getVersion()));
        }

        return makeShared<GetModDependenciesTask>(this, m_instance, model, selectedVers);
    }
    return nullptr;
};

ResourcePackDownloadDialog::ResourcePackDownloadDialog(QWidget* parent,
                                                       const std::shared_ptr<ResourcePackFolderModel>& resource_packs,
                                                       BaseInstance* instance)
    : ResourceDownloadDialog(parent, resource_packs), m_instance(instance)
{
    setWindowTitle(dialogTitle());

    initializeContainer();
    connectButtons();

    if (!geometrySaveKey().isEmpty())
        restoreGeometry(QByteArray::fromBase64(APPLICATION->settings()->get(geometrySaveKey()).toByteArray()));
}

QList<BasePage*> ResourcePackDownloadDialog::getPages()
{
    QList<BasePage*> pages;

    pages.append(ModrinthResourcePackPage::create(this, *m_instance));
    if (APPLICATION->capabilities() & Application::SupportsFlame)
        pages.append(FlameResourcePackPage::create(this, *m_instance));

    m_selectedPage = dynamic_cast<ResourcePackResourcePage*>(pages[0]);

    return pages;
}

TexturePackDownloadDialog::TexturePackDownloadDialog(QWidget* parent,
                                                     const std::shared_ptr<TexturePackFolderModel>& resource_packs,
                                                     BaseInstance* instance)
    : ResourceDownloadDialog(parent, resource_packs), m_instance(instance)
{
    setWindowTitle(dialogTitle());

    initializeContainer();
    connectButtons();

    if (!geometrySaveKey().isEmpty())
        restoreGeometry(QByteArray::fromBase64(APPLICATION->settings()->get(geometrySaveKey()).toByteArray()));
}

QList<BasePage*> TexturePackDownloadDialog::getPages()
{
    QList<BasePage*> pages;

    pages.append(ModrinthTexturePackPage::create(this, *m_instance));
    if (APPLICATION->capabilities() & Application::SupportsFlame)
        pages.append(FlameTexturePackPage::create(this, *m_instance));

    m_selectedPage = dynamic_cast<TexturePackResourcePage*>(pages[0]);

    return pages;
}

ShaderPackDownloadDialog::ShaderPackDownloadDialog(QWidget* parent,
                                                   const std::shared_ptr<ShaderPackFolderModel>& shaders,
                                                   BaseInstance* instance)
    : ResourceDownloadDialog(parent, shaders), m_instance(instance)
{
    setWindowTitle(dialogTitle());

    initializeContainer();
    connectButtons();

    if (!geometrySaveKey().isEmpty())
        restoreGeometry(QByteArray::fromBase64(APPLICATION->settings()->get(geometrySaveKey()).toByteArray()));
}

QList<BasePage*> ShaderPackDownloadDialog::getPages()
{
    QList<BasePage*> pages;

    pages.append(ModrinthShaderPackPage::create(this, *m_instance));

    m_selectedPage = dynamic_cast<ShaderPackResourcePage*>(pages[0]);

    return pages;
}

}  // namespace ResourceDownload