// Copyright 2016 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#include <algorithm>
#include <memory>
#include <utility>

#include <QHeaderView>
#include <QMenu>
#include <QStandardItemModel>
#include <QString>
#include <QTimer>
#include <QTreeView>

#include "common/common_paths.h"
#include "common/file_util.h"
#include "core/core.h"
#include "core/file_sys/patch_manager.h"
#include "core/file_sys/xts_archive.h"
#include "core/loader/loader.h"
#include "ui_configure_per_game_addons.h"
#include "yuzu/configuration/config.h"
#include "yuzu/configuration/configure_input.h"
#include "yuzu/configuration/configure_per_game_addons.h"
#include "yuzu/uisettings.h"
#include "yuzu/util/util.h"

ConfigurePerGameAddons::ConfigurePerGameAddons(QWidget* parent)
    : QWidget(parent), ui(new Ui::ConfigurePerGameAddons) {
    ui->setupUi(this);

    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->setContextMenuPolicy(Qt::NoContextMenu);

    item_model->insertColumns(0, 2);
    item_model->setHeaderData(0, Qt::Horizontal, tr("Patch Name"));
    item_model->setHeaderData(1, Qt::Horizontal, tr("Version"));

    // 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);

    ui->scrollArea->setLayout(layout);

    ui->scrollArea->setEnabled(!Core::System::GetInstance().IsPoweredOn());

    connect(item_model, &QStandardItemModel::itemChanged,
            [] { UISettings::values.is_game_list_reload_pending.exchange(true); });
}

ConfigurePerGameAddons::~ConfigurePerGameAddons() = default;

void ConfigurePerGameAddons::ApplyConfiguration() {
    std::vector<std::string> disabled_addons;

    for (const auto& item : list_items) {
        const auto disabled = item.front()->checkState() == Qt::Unchecked;
        if (disabled)
            disabled_addons.push_back(item.front()->text().toStdString());
    }

    auto current = Settings::values.disabled_addons[title_id];
    std::sort(disabled_addons.begin(), disabled_addons.end());
    std::sort(current.begin(), current.end());
    if (disabled_addons != current) {
        Common::FS::Delete(Common::FS::GetUserPath(Common::FS::UserPath::CacheDir) + DIR_SEP +
                           "game_list" + DIR_SEP + fmt::format("{:016X}.pv.txt", title_id));
    }

    Settings::values.disabled_addons[title_id] = disabled_addons;
}

void ConfigurePerGameAddons::LoadFromFile(FileSys::VirtualFile file) {
    this->file = std::move(file);
    LoadConfiguration();
}

void ConfigurePerGameAddons::SetTitleId(u64 id) {
    this->title_id = id;
}

void ConfigurePerGameAddons::changeEvent(QEvent* event) {
    if (event->type() == QEvent::LanguageChange) {
        RetranslateUI();
    }

    QWidget::changeEvent(event);
}

void ConfigurePerGameAddons::RetranslateUI() {
    ui->retranslateUi(this);
}

void ConfigurePerGameAddons::LoadConfiguration() {
    if (file == nullptr) {
        return;
    }

    FileSys::PatchManager pm{title_id};
    const auto loader = Loader::GetLoader(file);

    FileSys::VirtualFile update_raw;
    loader->ReadUpdateRaw(update_raw);

    const auto& disabled = Settings::values.disabled_addons[title_id];

    for (const auto& patch : pm.GetPatchVersionNames(update_raw)) {
        const auto name =
            QString::fromStdString(patch.first).replace(QStringLiteral("[D] "), QString{});

        auto* const first_item = new QStandardItem;
        first_item->setText(name);
        first_item->setCheckable(true);

        const auto patch_disabled =
            std::find(disabled.begin(), disabled.end(), name.toStdString()) != disabled.end();

        first_item->setCheckState(patch_disabled ? Qt::Unchecked : Qt::Checked);

        list_items.push_back(QList<QStandardItem*>{
            first_item, new QStandardItem{QString::fromStdString(patch.second)}});
        item_model->appendRow(list_items.back());
    }

    tree_view->setColumnWidth(0, 5 * tree_view->width() / 16);
}