// SPDX-FileCopyrightText: 2016 Citra Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later

#pragma once

#include <forward_list>
#include <iterator>
#include <memory>
#include <QCheckBox>
#include <QComboBox>
#include <QWidget>
#include <qobjectdefs.h>
#include "common/settings.h"
#include "yuzu/configuration/shared_translation.h"

namespace ConfigurationShared {

class Tab : public QWidget {
    Q_OBJECT

public:
    explicit Tab(std::shared_ptr<std::forward_list<Tab*>> group_, QWidget* parent = nullptr);
    ~Tab();

    virtual void ApplyConfiguration() = 0;
    virtual void SetConfiguration() = 0;

private:
    std::shared_ptr<std::forward_list<Tab*>> group;
};

constexpr int USE_GLOBAL_INDEX = 0;
constexpr int USE_GLOBAL_SEPARATOR_INDEX = 1;
constexpr int USE_GLOBAL_OFFSET = 2;

// CheckBoxes require a tracker for their state since we emulate a tristate CheckBox
enum class CheckState {
    Off,    // Checkbox overrides to off/false
    On,     // Checkbox overrides to on/true
    Global, // Checkbox defers to the global state
    Count,  // Simply the number of states, not a valid checkbox state
};

QWidget* CreateWidget(Settings::BasicSetting* setting, const TranslationMap& translations,
                      QWidget* parent, bool runtime_lock,
                      std::forward_list<std::function<void(bool)>>& apply_funcs,
                      std::list<CheckState>& trackers);

// Global-aware apply and set functions

// ApplyPerGameSetting, given a Settings::Setting and a Qt UI element, properly applies a Setting
void ApplyPerGameSetting(Settings::SwitchableSetting<bool>* setting, const QCheckBox* checkbox,
                         const CheckState& tracker);
template <typename Type, bool ranged>
void ApplyPerGameSetting(Settings::SwitchableSetting<Type, ranged>* setting,
                         const QComboBox* combobox) {
    if (Settings::IsConfiguringGlobal() && setting->UsingGlobal()) {
        setting->SetValue(static_cast<Type>(combobox->currentIndex()));
    } else if (!Settings::IsConfiguringGlobal()) {
        if (combobox->currentIndex() == ConfigurationShared::USE_GLOBAL_INDEX) {
            setting->SetGlobal(true);
        } else {
            setting->SetGlobal(false);
            setting->SetValue(static_cast<Type>(combobox->currentIndex() -
                                                ConfigurationShared::USE_GLOBAL_OFFSET));
        }
    }
}

// Sets a Qt UI element given a Settings::Setting
void SetPerGameSetting(QCheckBox* checkbox, const Settings::SwitchableSetting<bool>* setting);

template <typename Type, bool ranged>
void SetPerGameSetting(QComboBox* combobox,
                       const Settings::SwitchableSetting<Type, ranged>* setting) {
    combobox->setCurrentIndex(setting->UsingGlobal() ? ConfigurationShared::USE_GLOBAL_INDEX
                                                     : static_cast<int>(setting->GetValue()) +
                                                           ConfigurationShared::USE_GLOBAL_OFFSET);
}

// (Un)highlights a Qt UI element
void SetHighlight(QWidget* widget, bool highlighted);

// Sets up a QCheckBox like a tristate one, given a Setting
template <bool ranged, bool save>
void SetColoredTristate(QCheckBox* checkbox,
                        const Settings::SwitchableSetting<bool, ranged, save>& setting,
                        CheckState& tracker) {
    if (setting.UsingGlobal()) {
        tracker = CheckState::Global;
    } else {
        tracker = (setting.GetValue() == setting.GetValue(true)) ? CheckState::On : CheckState::Off;
    }
    SetHighlight(checkbox, tracker != CheckState::Global);
    QObject::connect(checkbox, &QCheckBox::clicked, checkbox, [checkbox, setting, &tracker] {
        tracker = static_cast<CheckState>((static_cast<int>(tracker) + 1) %
                                          static_cast<int>(CheckState::Count));
        if (tracker == CheckState::Global) {
            checkbox->setChecked(setting.GetValue(true));
        }
        SetHighlight(checkbox, tracker != CheckState::Global);
    });
}

void SetColoredTristate(QCheckBox* checkbox, bool global, bool state, bool global_state,
                        CheckState& tracker);

// Sets up coloring of a QWidget `target` based on the state of a QComboBox, and calls
// InsertGlobalItem
void SetColoredComboBox(QComboBox* combobox, QWidget* target, int global);

// Adds the "Use Global Configuration" selection and separator to the beginning of a QComboBox
void InsertGlobalItem(QComboBox* combobox, int global_index);

// Returns the correct index of a QComboBox taking into account global configuration
int GetComboboxIndex(int global_setting_index, const QComboBox* combobox);

} // namespace ConfigurationShared