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// Copyright 2018 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#include <mutex>
#include <QDialogButtonBox>
#include <QHeaderView>
#include <QLabel>
#include <QLineEdit>
#include <QScrollArea>
#include <QStandardItemModel>
#include <QVBoxLayout>
#include "common/file_util.h"
#include "common/string_util.h"
#include "core/constants.h"
#include "core/hle/lock.h"
#include "yuzu/applets/profile_select.h"
#include "yuzu/main.h"

QString FormatUserEntryText(const QString& username, Common::UUID uuid) {
    return QtProfileSelectionDialog::tr(
               "%1\n%2", "%1 is the profile username, %2 is the formatted UUID (e.g. "
                         "00112233-4455-6677-8899-AABBCCDDEEFF))")
        .arg(username, QString::fromStdString(uuid.FormatSwitch()));
}

QString GetImagePath(Common::UUID uuid) {
    const auto path = FileUtil::GetUserPath(FileUtil::UserPath::NANDDir) +
                      "/system/save/8000000000000010/su/avators/" + uuid.FormatSwitch() + ".jpg";
    return QString::fromStdString(path);
}

QPixmap GetIcon(Common::UUID uuid) {
    QPixmap icon{GetImagePath(uuid)};

    if (!icon) {
        icon.fill(Qt::black);
        icon.loadFromData(Core::Constants::ACCOUNT_BACKUP_JPEG.data(),
                          static_cast<u32>(Core::Constants::ACCOUNT_BACKUP_JPEG.size()));
    }

    return icon.scaled(64, 64, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
}

QtProfileSelectionDialog::QtProfileSelectionDialog(QWidget* parent)
    : QDialog(parent), profile_manager(std::make_unique<Service::Account::ProfileManager>()) {
    outer_layout = new QVBoxLayout;

    instruction_label = new QLabel(tr("Select a user:"));

    scroll_area = new QScrollArea;

    buttons = new QDialogButtonBox(QDialogButtonBox::Cancel | QDialogButtonBox::Ok);
    connect(buttons, &QDialogButtonBox::accepted, this, &QtProfileSelectionDialog::accept);
    connect(buttons, &QDialogButtonBox::rejected, this, &QtProfileSelectionDialog::reject);

    outer_layout->addWidget(instruction_label);
    outer_layout->addWidget(scroll_area);
    outer_layout->addWidget(buttons);

    layout = new QVBoxLayout;
    tree_view = new QTreeView;
    item_model = new QStandardItemModel(tree_view);
    tree_view->setModel(item_model);

    tree_view->setAlternatingRowColors(true);
    tree_view->setSelectionMode(QHeaderView::SingleSelection);
    tree_view->setSelectionBehavior(QHeaderView::SelectRows);
    tree_view->setVerticalScrollMode(QHeaderView::ScrollPerPixel);
    tree_view->setHorizontalScrollMode(QHeaderView::ScrollPerPixel);
    tree_view->setSortingEnabled(true);
    tree_view->setEditTriggers(QHeaderView::NoEditTriggers);
    tree_view->setUniformRowHeights(true);
    tree_view->setIconSize({64, 64});
    tree_view->setContextMenuPolicy(Qt::NoContextMenu);

    item_model->insertColumns(0, 1);
    item_model->setHeaderData(0, Qt::Horizontal, tr("Users"));

    // We must register all custom types with the Qt Automoc system so that we are able to use it
    // with signals/slots. In this case, QList falls under the umbrella of custom types.
    qRegisterMetaType<QList<QStandardItem*>>("QList<QStandardItem*>");

    layout->setContentsMargins(0, 0, 0, 0);
    layout->setSpacing(0);
    layout->addWidget(tree_view);

    scroll_area->setLayout(layout);

    connect(tree_view, &QTreeView::clicked, this, &QtProfileSelectionDialog::SelectUser);

    const auto& profiles = profile_manager->GetAllUsers();
    for (const auto& user : profiles) {
        Service::Account::ProfileBase profile;
        if (!profile_manager->GetProfileBase(user, profile))
            continue;

        const auto username = Common::StringFromFixedZeroTerminatedBuffer(
            reinterpret_cast<const char*>(profile.username.data()), profile.username.size());

        list_items.push_back(QList<QStandardItem*>{new QStandardItem{
            GetIcon(user), FormatUserEntryText(QString::fromStdString(username), user)}});
    }

    for (const auto& item : list_items)
        item_model->appendRow(item);

    setLayout(outer_layout);
    setWindowTitle(tr("Profile Selector"));
    resize(550, 400);
}

QtProfileSelectionDialog::~QtProfileSelectionDialog() = default;

void QtProfileSelectionDialog::accept() {
    QDialog::accept();
}

void QtProfileSelectionDialog::reject() {
    user_index = 0;
    QDialog::reject();
}

int QtProfileSelectionDialog::GetIndex() const {
    return user_index;
}

void QtProfileSelectionDialog::SelectUser(const QModelIndex& index) {
    user_index = index.row();
}

QtProfileSelector::QtProfileSelector(GMainWindow& parent) {
    connect(this, &QtProfileSelector::MainWindowSelectProfile, &parent,
            &GMainWindow::ProfileSelectorSelectProfile, Qt::QueuedConnection);
    connect(&parent, &GMainWindow::ProfileSelectorFinishedSelection, this,
            &QtProfileSelector::MainWindowFinishedSelection, Qt::DirectConnection);
}

QtProfileSelector::~QtProfileSelector() = default;

void QtProfileSelector::SelectProfile(
    std::function<void(std::optional<Common::UUID>)> callback) const {
    this->callback = std::move(callback);
    emit MainWindowSelectProfile();
}

void QtProfileSelector::MainWindowFinishedSelection(std::optional<Common::UUID> uuid) {
    // Acquire the HLE mutex
    std::lock_guard lock{HLE::g_hle_lock};
    callback(uuid);
}