// SPDX-FileCopyrightText: 2019-2023 Connor McLaughlin <stenzek@gmail.com>
// SPDX-License-Identifier: (GPL-3.0 OR CC-BY-NC-ND-4.0)

#pragma once

#include "qthost.h"
#include "qtutils.h"
#include "settingswindow.h"

#include "core/host.h"
#include "core/settings.h"

#include "common/assert.h"
#include "common/file_system.h"
#include "common/path.h"

#include <QtCore/QtCore>
#include <QtGui/QAction>
#include <QtWidgets/QAbstractButton>
#include <QtWidgets/QCheckBox>
#include <QtWidgets/QComboBox>
#include <QtWidgets/QDoubleSpinBox>
#include <QtWidgets/QFileDialog>
#include <QtWidgets/QLineEdit>
#include <QtWidgets/QMenu>
#include <QtWidgets/QMessageBox>
#include <QtWidgets/QSlider>
#include <QtWidgets/QSpinBox>
#include <optional>
#include <type_traits>

namespace SettingWidgetBinder {
static constexpr const char* NULLABLE_PROPERTY = "SettingWidgetBinder_isNullable";
static constexpr const char* IS_NULL_PROPERTY = "SettingWidgetBinder_isNull";
static constexpr const char* GLOBAL_VALUE_PROPERTY = "SettingWidgetBinder_globalValue";

template<typename T>
struct SettingAccessor
{
  static bool getBoolValue(const T* widget);
  static void setBoolValue(T* widget, bool value);
  static void makeNullableBool(T* widget, bool globalValue);
  static std::optional<bool> getNullableBoolValue(const T* widget);
  static void setNullableBoolValue(T* widget, std::optional<bool> value);

  static int getIntValue(const T* widget);
  static void setIntValue(T* widget, bool nullable, int value);
  static void makeNullableInt(T* widget, int globalValue);
  static std::optional<int> getNullableIntValue(const T* widget);
  static void setNullableIntValue(T* widget, std::optional<int> value);

  static int getFloatValue(const T* widget);
  static void setFloatValue(T* widget, int value);
  static void makeNullableFloat(T* widget, float globalValue);
  static std::optional<float> getNullableFloatValue(const T* widget);
  static void setNullableFloatValue(T* widget, std::optional<float> value);

  static QString getStringValue(const T* widget);
  static void setStringValue(T* widget, const QString& value);
  static void makeNullableString(T* widget, const QString& globalValue);
  static std::optional<QString> getNullableStringValue(const T* widget);
  static void setNullableFloatValue(T* widget, std::optional<QString> value);

  template<typename F>
  static void connectValueChanged(T* widget, F func);
};

template<>
struct SettingAccessor<QLineEdit>
{
  static bool getBoolValue(const QLineEdit* widget) { return widget->text().toInt() != 0; }
  static void setBoolValue(QLineEdit* widget, bool value)
  {
    widget->setText(value ? QStringLiteral("1") : QStringLiteral("0"));
  }
  static void makeNullableBool(QLineEdit* widget, bool globalValue) { widget->setEnabled(false); }
  static std::optional<bool> getNullableBoolValue(const QLineEdit* widget) { return getBoolValue(widget); }
  static void setNullableBoolValue(QLineEdit* widget, std::optional<bool> value)
  {
    setBoolValue(widget, value.value_or(false));
  }

  static int getIntValue(const QLineEdit* widget) { return widget->text().toInt(); }
  static void setIntValue(QLineEdit* widget, int value) { widget->setText(QString::number(value)); }
  static void makeNullableInt(QLineEdit* widget, int globalValue) { widget->setEnabled(false); }
  static std::optional<int> getNullableIntValue(const QLineEdit* widget) { return getIntValue(widget); }
  static void setNullableIntValue(QLineEdit* widget, std::optional<int> value)
  {
    setIntValue(widget, value.value_or(0));
  }

  static float getFloatValue(const QLineEdit* widget) { return widget->text().toFloat(); }
  static void setFloatValue(QLineEdit* widget, float value) { widget->setText(QString::number(value)); }
  static void makeNullableFloat(QLineEdit* widget, float globalValue) { widget->setEnabled(false); }
  static std::optional<float> getNullableFloatValue(const QLineEdit* widget) { return getFloatValue(widget); }
  static void setNullableFloatValue(QLineEdit* widget, std::optional<float> value)
  {
    setFloatValue(widget, value.value_or(0.0f));
  }

  static QString getStringValue(const QLineEdit* widget) { return widget->text(); }
  static void setStringValue(QLineEdit* widget, const QString& value) { widget->setText(value); }
  static void makeNullableString(QLineEdit* widget, const QString& globalValue) { widget->setEnabled(false); }
  static std::optional<QString> getNullableStringValue(const QLineEdit* widget) { return getStringValue(widget); }
  static void setNullableStringValue(QLineEdit* widget, std::optional<QString> value)
  {
    setStringValue(widget, value.value_or(QString()));
  }

  template<typename F>
  static void connectValueChanged(QLineEdit* widget, F func)
  {
    widget->connect(widget, &QLineEdit::textChanged, func);
  }
};

template<>
struct SettingAccessor<QComboBox>
{
  static bool isNullValue(const QComboBox* widget) { return (widget->currentIndex() == 0); }

  static bool getBoolValue(const QComboBox* widget) { return widget->currentIndex() > 0; }
  static void setBoolValue(QComboBox* widget, bool value) { widget->setCurrentIndex(value ? 1 : 0); }
  static void makeNullableBool(QComboBox* widget, bool globalValue)
  {
    widget->insertItem(0, globalValue ? qApp->translate("SettingsDialog", "Use Global Setting [Enabled]") :
                                        qApp->translate("SettingsDialog", "Use Global Setting [Disabled]"));
  }

  static int getIntValue(const QComboBox* widget) { return widget->currentIndex(); }
  static void setIntValue(QComboBox* widget, int value) { widget->setCurrentIndex(value); }
  static void makeNullableInt(QComboBox* widget, int globalValue)
  {
    widget->insertItem(
      0, qApp->translate("SettingsDialog", "Use Global Setting [%1]")
           .arg((globalValue >= 0 && globalValue < widget->count()) ? widget->itemText(globalValue) : QString()));
  }
  static std::optional<int> getNullableIntValue(const QComboBox* widget)
  {
    return isNullValue(widget) ? std::nullopt : std::optional<int>(widget->currentIndex() - 1);
  }
  static void setNullableIntValue(QComboBox* widget, std::optional<int> value)
  {
    widget->setCurrentIndex(value.has_value() ? (value.value() + 1) : 0);
  }

  static float getFloatValue(const QComboBox* widget) { return static_cast<float>(widget->currentIndex()); }
  static void setFloatValue(QComboBox* widget, float value) { widget->setCurrentIndex(static_cast<int>(value)); }
  static void makeNullableFloat(QComboBox* widget, float globalValue)
  {
    widget->insertItem(0, qApp->translate("SettingsDialog", "Use Global Setting [%1]")
                            .arg((globalValue >= 0.0f && static_cast<int>(globalValue) < widget->count()) ?
                                   widget->itemText(static_cast<int>(globalValue)) :
                                   QString()));
  }
  static std::optional<float> getNullableFloatValue(const QComboBox* widget)
  {
    return isNullValue(widget) ? std::nullopt : std::optional<float>(static_cast<float>(widget->currentIndex() + 1));
  }
  static void setNullableFloatValue(QComboBox* widget, std::optional<float> value)
  {
    widget->setCurrentIndex(value.has_value() ? static_cast<int>(value.value() + 1.0f) : 0);
  }

  static QString getStringValue(const QComboBox* widget)
  {
    const QVariant currentData(widget->currentData());
    if (currentData.metaType().id() == QMetaType::QString)
      return currentData.toString();

    return widget->currentText();
  }
  static void setStringValue(QComboBox* widget, const QString& value)
  {
    const int index = widget->findData(value);
    if (index >= 0)
    {
      widget->setCurrentIndex(index);
      return;
    }

    widget->setCurrentText(value);
  }
  static void makeNullableString(QComboBox* widget, const QString& globalValue)
  {
    makeNullableInt(widget, widget->findData(globalValue));
  }
  static std::optional<QString> getNullableStringValue(const QComboBox* widget)
  {
    return isNullValue(widget) ? std::nullopt : std::optional<QString>(getStringValue(widget));
  }
  static void setNullableStringValue(QComboBox* widget, std::optional<QString> value)
  {
    value.has_value() ? setStringValue(widget, value.value()) : widget->setCurrentIndex(0);
  }

  template<typename F>
  static void connectValueChanged(QComboBox* widget, F func)
  {
    widget->connect(widget, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged), func);
  }
};

template<>
struct SettingAccessor<QCheckBox>
{
  static bool getBoolValue(const QCheckBox* widget) { return widget->isChecked(); }
  static void setBoolValue(QCheckBox* widget, bool value) { widget->setChecked(value); }
  static void makeNullableBool(QCheckBox* widget, bool globalValue) { widget->setTristate(true); }
  static std::optional<bool> getNullableBoolValue(const QCheckBox* widget)
  {
    return (widget->checkState() == Qt::PartiallyChecked) ? std::nullopt : std::optional<bool>(widget->isChecked());
  }
  static void setNullableBoolValue(QCheckBox* widget, std::optional<bool> value)
  {
    widget->setCheckState(value.has_value() ? (value.value() ? Qt::Checked : Qt::Unchecked) : Qt::PartiallyChecked);
  }

  static int getIntValue(const QCheckBox* widget) { return widget->isChecked() ? 1 : 0; }
  static void setIntValue(QCheckBox* widget, int value) { widget->setChecked(value != 0); }
  static void makeNullableInt(QCheckBox* widget, int globalValue) { widget->setTristate(true); }
  static std::optional<int> getNullableIntValue(const QCheckBox* widget)
  {
    return (widget->checkState() == Qt::PartiallyChecked) ? std::nullopt :
                                                            std::optional<int>(widget->isChecked() ? 1 : 0);
  }
  static void setNullableIntValue(QCheckBox* widget, std::optional<int> value)
  {
    widget->setCheckState(value.has_value() ? ((value.value() != 0) ? Qt::Checked : Qt::Unchecked) :
                                              Qt::PartiallyChecked);
  }

  static float getFloatValue(const QCheckBox* widget) { return widget->isChecked() ? 1.0f : 0.0f; }
  static void setFloatValue(QCheckBox* widget, float value) { widget->setChecked(value != 0.0f); }
  static void makeNullableFloat(QCheckBox* widget, float globalValue) { widget->setTristate(true); }
  static std::optional<float> getNullableFloatValue(const QCheckBox* widget)
  {
    return (widget->checkState() == Qt::PartiallyChecked) ? std::nullopt :
                                                            std::optional<float>(widget->isChecked() ? 1.0f : 0.0f);
  }
  static void setNullableFloatValue(QCheckBox* widget, std::optional<float> value)
  {
    widget->setCheckState(value.has_value() ? ((value.value() != 0.0f) ? Qt::Checked : Qt::Unchecked) :
                                              Qt::PartiallyChecked);
  }

  static QString getStringValue(const QCheckBox* widget)
  {
    return widget->isChecked() ? QStringLiteral("1") : QStringLiteral("0");
  }
  static void setStringValue(QCheckBox* widget, const QString& value) { widget->setChecked(value.toInt() != 0); }
  static void makeNullableString(QCheckBox* widget, const QString& globalValue) { widget->setTristate(true); }
  static std::optional<QString> getNullableStringValue(const QCheckBox* widget)
  {
    return (widget->checkState() == Qt::PartiallyChecked) ?
             std::nullopt :
             std::optional<QString>(widget->isChecked() ? QStringLiteral("1") : QStringLiteral("0"));
  }
  static void setNullableStringValue(QCheckBox* widget, std::optional<QString> value)
  {
    widget->setCheckState(value.has_value() ? ((value->toInt() != 0) ? Qt::Checked : Qt::Unchecked) :
                                              Qt::PartiallyChecked);
  }

  template<typename F>
  static void connectValueChanged(QCheckBox* widget, F func)
  {
    widget->connect(widget, &QCheckBox::stateChanged, func);
  }
};

template<>
struct SettingAccessor<QSlider>
{
  static bool getBoolValue(const QSlider* widget) { return widget->value() > 0; }
  static void setBoolValue(QSlider* widget, bool value) { widget->setValue(value ? 1 : 0); }
  static void makeNullableBool(QSlider* widget, bool globalSetting) { widget->setEnabled(false); }
  static std::optional<bool> getNullableBoolValue(const QSlider* widget) { return getBoolValue(widget); }
  static void setNullableBoolValue(QSlider* widget, std::optional<bool> value)
  {
    setBoolValue(widget, value.value_or(false));
  }

  static int getIntValue(const QSlider* widget) { return widget->value(); }
  static void setIntValue(QSlider* widget, int value) { widget->setValue(value); }
  static void makeNullableInt(QSlider* widget, int globalValue) { widget->setEnabled(false); }
  static std::optional<int> getNullableIntValue(const QSlider* widget) { return getIntValue(widget); }
  static void setNullableIntValue(QSlider* widget, std::optional<int> value) { setIntValue(widget, value.value_or(0)); }

  static float getFloatValue(const QSlider* widget) { return static_cast<float>(widget->value()); }
  static void setFloatValue(QSlider* widget, float value) { widget->setValue(static_cast<int>(value)); }
  static void makeNullableFloat(QSlider* widget, float globalValue) { widget->setEnabled(false); }
  static std::optional<float> getNullableFloatValue(const QSlider* widget) { return getFloatValue(widget); }
  static void setNullableFloatValue(QSlider* widget, std::optional<float> value)
  {
    setFloatValue(widget, value.value_or(0.0f));
  }

  static QString getStringValue(const QSlider* widget) { return QString::number(widget->value()); }
  static void setStringValue(QSlider* widget, const QString& value) { widget->setValue(value.toInt()); }
  static void makeNullableString(QSlider* widget, const QString& globalValue) { widget->setEnabled(false); }
  static std::optional<QString> getNullableStringValue(const QSlider* widget) { return getStringValue(widget); }
  static void setNullableStringValue(QSlider* widget, std::optional<QString> value)
  {
    setStringValue(widget, value.value_or(QString()));
  }

  template<typename F>
  static void connectValueChanged(QSlider* widget, F func)
  {
    widget->connect(widget, &QSlider::valueChanged, func);
  }
};

template<>
struct SettingAccessor<QSpinBox>
{
  static bool isNullable(const QSpinBox* widget) { return widget->property(NULLABLE_PROPERTY).toBool(); }

  static void updateFont(QSpinBox* widget, bool isNull)
  {
    // We should be able to use QFont here.. but it doesn't update on change.
    widget->setStyleSheet(isNull ? QStringLiteral("font-style: italic;") : QString());
    widget->setPrefix(isNull ? qApp->translate("SettingWidgetBinder", "Default: ") : QString());
  }

  static bool getBoolValue(const QSpinBox* widget) { return widget->value() > 0; }
  static void setBoolValue(QSpinBox* widget, bool value) { widget->setValue(value ? 1 : 0); }
  static void makeNullableBool(QSpinBox* widget, bool globalSetting)
  {
    widget->setProperty(NULLABLE_PROPERTY, QVariant(true));
    widget->setProperty(GLOBAL_VALUE_PROPERTY, QVariant(globalSetting));
  }
  static std::optional<bool> getNullableBoolValue(const QSpinBox* widget)
  {
    if (widget->property(IS_NULL_PROPERTY).toBool())
      return std::nullopt;

    return getBoolValue(widget);
  }
  static void setNullableBoolValue(QSpinBox* widget, std::optional<bool> value)
  {
    widget->setProperty(IS_NULL_PROPERTY, QVariant(!value.has_value()));
    setBoolValue(widget, value.has_value() ? value.value() : widget->property(GLOBAL_VALUE_PROPERTY).toBool());
    updateFont(widget, !value.has_value());
  }

  static int getIntValue(const QSpinBox* widget) { return widget->value(); }
  static void setIntValue(QSpinBox* widget, int value) { widget->setValue(value); }
  static void makeNullableInt(QSpinBox* widget, int globalValue)
  {
    widget->setProperty(NULLABLE_PROPERTY, QVariant(true));
    widget->setProperty(GLOBAL_VALUE_PROPERTY, QVariant(globalValue));
  }
  static std::optional<int> getNullableIntValue(const QSpinBox* widget)
  {
    if (widget->property(IS_NULL_PROPERTY).toBool())
      return std::nullopt;

    return getIntValue(widget);
  }
  static void setNullableIntValue(QSpinBox* widget, std::optional<int> value)
  {
    widget->setProperty(IS_NULL_PROPERTY, QVariant(!value.has_value()));
    setIntValue(widget, value.has_value() ? value.value() : widget->property(GLOBAL_VALUE_PROPERTY).toInt());
    updateFont(widget, !value.has_value());
  }

  static float getFloatValue(const QSpinBox* widget) { return static_cast<float>(widget->value()); }
  static void setFloatValue(QSpinBox* widget, float value) { widget->setValue(static_cast<int>(value)); }
  static void makeNullableFloat(QSpinBox* widget, float globalValue)
  {
    widget->setProperty(NULLABLE_PROPERTY, QVariant(true));
    widget->setProperty(GLOBAL_VALUE_PROPERTY, QVariant(globalValue));
  }
  static std::optional<float> getNullableFloatValue(const QSpinBox* widget)
  {
    if (widget->property(IS_NULL_PROPERTY).toBool())
      return std::nullopt;

    return getFloatValue(widget);
  }
  static void setNullableFloatValue(QSpinBox* widget, std::optional<float> value)
  {
    widget->setProperty(IS_NULL_PROPERTY, QVariant(!value.has_value()));
    setFloatValue(widget, value.has_value() ? value.value() : widget->property(GLOBAL_VALUE_PROPERTY).toFloat());
    updateFont(widget, !value.has_value());
  }

  static QString getStringValue(const QSpinBox* widget) { return QString::number(widget->value()); }
  static void setStringValue(QSpinBox* widget, const QString& value) { widget->setValue(value.toInt()); }
  static void makeNullableString(QSpinBox* widget, const QString& globalValue)
  {
    widget->setProperty(NULLABLE_PROPERTY, QVariant(true));
    widget->setProperty(GLOBAL_VALUE_PROPERTY, QVariant(globalValue));
  }
  static std::optional<QString> getNullableStringValue(const QSpinBox* widget)
  {
    if (widget->property(IS_NULL_PROPERTY).toBool())
      return std::nullopt;

    return getStringValue(widget);
  }
  static void setNullableStringValue(QSpinBox* widget, std::optional<QString> value)
  {
    widget->setProperty(IS_NULL_PROPERTY, QVariant(!value.has_value()));
    setStringValue(widget, value.has_value() ? value.value() : widget->property(GLOBAL_VALUE_PROPERTY).toString());
    updateFont(widget, !value.has_value());
  }

  template<typename F>
  static void connectValueChanged(QSpinBox* widget, F func)
  {
    if (!isNullable(widget))
    {
      widget->connect(widget, QOverload<int>::of(&QSpinBox::valueChanged), func);
    }
    else
    {
      widget->setContextMenuPolicy(Qt::CustomContextMenu);
      widget->connect(widget, &QSpinBox::customContextMenuRequested, widget, [widget, func](const QPoint& pt) {
        QMenu menu(widget);
        widget->connect(menu.addAction(qApp->translate("SettingWidgetBinder", "Reset")), &QAction::triggered, widget,
                        [widget, func = std::move(func)]() {
                          const bool old = widget->blockSignals(true);
                          setNullableIntValue(widget, std::nullopt);
                          widget->blockSignals(old);
                          updateFont(widget, true);
                          func();
                        });
        menu.exec(widget->mapToGlobal(pt));
      });
      widget->connect(widget, &QSpinBox::valueChanged, widget, [widget, func = std::move(func)]() {
        if (widget->property(IS_NULL_PROPERTY).toBool())
        {
          widget->setProperty(IS_NULL_PROPERTY, QVariant(false));
          updateFont(widget, false);
        }
        func();
      });
    }
  }
};

template<>
struct SettingAccessor<QDoubleSpinBox>
{
  static bool isNullable(const QDoubleSpinBox* widget) { return widget->property(NULLABLE_PROPERTY).toBool(); }

  static void updateFont(QDoubleSpinBox* widget, bool isNull)
  {
    // We should be able to use QFont here.. but it doesn't update on change.
    widget->setStyleSheet(isNull ? QStringLiteral("font-style: italic;") : QString());
    widget->setPrefix(isNull ? qApp->translate("SettingWidgetBinder", "Default: ") : QString());
  }

  static bool getBoolValue(const QDoubleSpinBox* widget) { return widget->value() > 0.0; }
  static void setBoolValue(QDoubleSpinBox* widget, bool value) { widget->setValue(value ? 1.0 : 0.0); }
  static void makeNullableBool(QDoubleSpinBox* widget, bool globalSetting)
  {
    widget->setProperty(NULLABLE_PROPERTY, QVariant(true));
    widget->setProperty(GLOBAL_VALUE_PROPERTY, QVariant(globalSetting));
  }
  static std::optional<bool> getNullableBoolValue(const QDoubleSpinBox* widget)
  {
    if (widget->property(IS_NULL_PROPERTY).toBool())
      return std::nullopt;

    return getBoolValue(widget);
  }
  static void setNullableBoolValue(QDoubleSpinBox* widget, std::optional<bool> value)
  {
    widget->setProperty(IS_NULL_PROPERTY, QVariant(!value.has_value()));
    setBoolValue(widget, value.has_value() ? value.value() : widget->property(GLOBAL_VALUE_PROPERTY).toBool());
    updateFont(widget, !value.has_value());
  }

  static int getIntValue(const QDoubleSpinBox* widget) { return static_cast<int>(widget->value()); }
  static void setIntValue(QDoubleSpinBox* widget, int value) { widget->setValue(static_cast<double>(value)); }
  static void makeNullableInt(QDoubleSpinBox* widget, int globalValue)
  {
    widget->setProperty(NULLABLE_PROPERTY, QVariant(true));
    widget->setProperty(GLOBAL_VALUE_PROPERTY, QVariant(globalValue));
  }
  static std::optional<int> getNullableIntValue(const QDoubleSpinBox* widget)
  {
    if (widget->property(IS_NULL_PROPERTY).toBool())
      return std::nullopt;

    return getIntValue(widget);
  }
  static void setNullableIntValue(QDoubleSpinBox* widget, std::optional<int> value)
  {
    widget->setProperty(IS_NULL_PROPERTY, QVariant(!value.has_value()));
    setIntValue(widget, value.has_value() ? value.value() : widget->property(GLOBAL_VALUE_PROPERTY).toInt());
    updateFont(widget, !value.has_value());
  }

  static float getFloatValue(const QDoubleSpinBox* widget) { return static_cast<float>(widget->value()); }
  static void setFloatValue(QDoubleSpinBox* widget, float value) { widget->setValue(static_cast<double>(value)); }
  static void makeNullableFloat(QDoubleSpinBox* widget, float globalValue)
  {
    widget->setProperty(NULLABLE_PROPERTY, QVariant(true));
    widget->setProperty(GLOBAL_VALUE_PROPERTY, QVariant(globalValue));
  }
  static std::optional<float> getNullableFloatValue(const QDoubleSpinBox* widget)
  {
    if (widget->property(IS_NULL_PROPERTY).toBool())
      return std::nullopt;

    return getFloatValue(widget);
  }
  static void setNullableFloatValue(QDoubleSpinBox* widget, std::optional<float> value)
  {
    widget->setProperty(IS_NULL_PROPERTY, QVariant(!value.has_value()));
    setFloatValue(widget, value.has_value() ? value.value() : widget->property(GLOBAL_VALUE_PROPERTY).toFloat());
    updateFont(widget, !value.has_value());
  }

  static QString getStringValue(const QDoubleSpinBox* widget) { return QString::number(widget->value()); }
  static void setStringValue(QDoubleSpinBox* widget, const QString& value) { widget->setValue(value.toDouble()); }
  static void makeNullableString(QDoubleSpinBox* widget, const QString& globalValue)
  {
    widget->setProperty(NULLABLE_PROPERTY, QVariant(true));
    widget->setProperty(GLOBAL_VALUE_PROPERTY, QVariant(globalValue));
  }
  static std::optional<QString> getNullableStringValue(const QDoubleSpinBox* widget)
  {
    if (widget->property(IS_NULL_PROPERTY).toBool())
      return std::nullopt;

    return getStringValue(widget);
  }
  static void setNullableStringValue(QDoubleSpinBox* widget, std::optional<QString> value)
  {
    widget->setProperty(IS_NULL_PROPERTY, QVariant(!value.has_value()));
    setStringValue(widget, value.has_value() ? value.value() : widget->property(GLOBAL_VALUE_PROPERTY).toString());
    updateFont(widget, !value.has_value());
  }

  template<typename F>
  static void connectValueChanged(QDoubleSpinBox* widget, F func)
  {
    if (!isNullable(widget))
    {
      widget->connect(widget, QOverload<double>::of(&QDoubleSpinBox::valueChanged), func);
    }
    else
    {
      widget->setContextMenuPolicy(Qt::CustomContextMenu);
      widget->connect(widget, &QDoubleSpinBox::customContextMenuRequested, widget, [widget, func](const QPoint& pt) {
        QMenu menu(widget);
        widget->connect(menu.addAction(qApp->translate("SettingWidgetBinder", "Reset")), &QAction::triggered, widget,
                        [widget, func = std::move(func)]() {
                          const bool old = widget->blockSignals(true);
                          setNullableFloatValue(widget, std::nullopt);
                          widget->blockSignals(old);
                          updateFont(widget, true);
                          func();
                        });
        menu.exec(widget->mapToGlobal(pt));
      });
      widget->connect(widget, QOverload<double>::of(&QDoubleSpinBox::valueChanged), widget,
                      [widget, func = std::move(func)]() {
                        if (widget->property(IS_NULL_PROPERTY).toBool())
                        {
                          widget->setProperty(IS_NULL_PROPERTY, QVariant(false));
                          updateFont(widget, false);
                        }
                        func();
                      });
    }
  }
};

template<>
struct SettingAccessor<QAction>
{
  static bool getBoolValue(const QAction* widget) { return widget->isChecked(); }
  static void setBoolValue(QAction* widget, bool value) { widget->setChecked(value); }
  static void makeNullableBool(QAction* widget, bool globalSetting) { widget->setEnabled(false); }
  static std::optional<bool> getNullableBoolValue(const QAction* widget) { return getBoolValue(widget); }
  static void setNullableBoolValue(QAction* widget, std::optional<bool> value)
  {
    setBoolValue(widget, value.value_or(false));
  }

  static int getIntValue(const QAction* widget) { return widget->isChecked() ? 1 : 0; }
  static void setIntValue(QAction* widget, int value) { widget->setChecked(value != 0); }
  static void makeNullableInt(QAction* widget, int globalValue) { widget->setEnabled(false); }
  static std::optional<int> getNullableIntValue(const QAction* widget) { return getIntValue(widget); }
  static void setNullableIntValue(QAction* widget, std::optional<int> value) { setIntValue(widget, value.value_or(0)); }

  static float getFloatValue(const QAction* widget) { return widget->isChecked() ? 1.0f : 0.0f; }
  static void setFloatValue(QAction* widget, float value) { widget->setChecked(value != 0.0f); }
  static void makeNullableFloat(QAction* widget, float globalValue) { widget->setEnabled(false); }
  static std::optional<float> getNullableFloatValue(const QAction* widget) { return getFloatValue(widget); }
  static void setNullableFloatValue(QAction* widget, std::optional<float> value)
  {
    setFloatValue(widget, value.value_or(0.0f));
  }

  static QString getStringValue(const QAction* widget)
  {
    return widget->isChecked() ? QStringLiteral("1") : QStringLiteral("0");
  }
  static void setStringValue(QAction* widget, const QString& value) { widget->setChecked(value.toInt() != 0); }
  static void makeNullableString(QAction* widget, const QString& globalValue) { widget->setEnabled(false); }
  static std::optional<QString> getNullableStringValue(const QAction* widget) { return getStringValue(widget); }
  static void setNullableStringValue(QAction* widget, std::optional<QString> value)
  {
    setStringValue(widget, value.value_or(QString()));
  }

  template<typename F>
  static void connectValueChanged(QAction* widget, F func)
  {
    widget->connect(widget, &QAction::toggled, func);
  }
};

/// Binds a widget's value to a setting, updating it when the value changes.

template<typename WidgetType>
static void BindWidgetToBoolSetting(SettingsInterface* sif, WidgetType* widget, std::string section, std::string key,
                                    bool default_value)
{
  using Accessor = SettingAccessor<WidgetType>;

  const bool value = Host::GetBaseBoolSettingValue(section.c_str(), key.c_str(), default_value);

  if (sif)
  {
    Accessor::makeNullableBool(widget, value);

    bool sif_value;
    if (sif->GetBoolValue(section.c_str(), key.c_str(), &sif_value))
      Accessor::setNullableBoolValue(widget, sif_value);
    else
      Accessor::setNullableBoolValue(widget, std::nullopt);

    Accessor::connectValueChanged(widget, [sif, widget, section = std::move(section), key = std::move(key)]() {
      if (std::optional<bool> new_value = Accessor::getNullableBoolValue(widget); new_value.has_value())
        sif->SetBoolValue(section.c_str(), key.c_str(), new_value.value());
      else
        sif->DeleteValue(section.c_str(), key.c_str());

      sif->Save();
      g_emu_thread->reloadGameSettings();
    });
  }
  else
  {
    Accessor::setBoolValue(widget, value);

    Accessor::connectValueChanged(widget, [widget, section = std::move(section), key = std::move(key)]() {
      const bool new_value = Accessor::getBoolValue(widget);
      Host::SetBaseBoolSettingValue(section.c_str(), key.c_str(), new_value);
      Host::CommitBaseSettingChanges();
      g_emu_thread->applySettings();
    });
  }
}

template<typename WidgetType>
static void BindWidgetToIntSetting(SettingsInterface* sif, WidgetType* widget, std::string section, std::string key,
                                   int default_value, int option_offset = 0)
{
  using Accessor = SettingAccessor<WidgetType>;

  const s32 value =
    Host::GetBaseIntSettingValue(section.c_str(), key.c_str(), static_cast<s32>(default_value)) - option_offset;

  if (sif)
  {
    Accessor::makeNullableInt(widget, value);

    int sif_value;
    if (sif->GetIntValue(section.c_str(), key.c_str(), &sif_value))
      Accessor::setNullableIntValue(widget, sif_value - option_offset);
    else
      Accessor::setNullableIntValue(widget, std::nullopt);

    Accessor::connectValueChanged(
      widget, [sif, widget, section = std::move(section), key = std::move(key), option_offset]() {
        if (std::optional<int> new_value = Accessor::getNullableIntValue(widget); new_value.has_value())
          sif->SetIntValue(section.c_str(), key.c_str(), new_value.value() + option_offset);
        else
          sif->DeleteValue(section.c_str(), key.c_str());

        sif->Save();
        g_emu_thread->reloadGameSettings();
      });
  }
  else
  {
    Accessor::setIntValue(widget, static_cast<int>(value));

    Accessor::connectValueChanged(
      widget, [widget, section = std::move(section), key = std::move(key), option_offset]() {
        const int new_value = Accessor::getIntValue(widget);
        Host::SetBaseIntSettingValue(section.c_str(), key.c_str(), new_value + option_offset);
        Host::CommitBaseSettingChanges();
        g_emu_thread->applySettings();
      });
  }
}

template<typename WidgetType>
static void BindWidgetToFloatSetting(SettingsInterface* sif, WidgetType* widget, std::string section, std::string key,
                                     float default_value)
{
  using Accessor = SettingAccessor<WidgetType>;

  const float value = Host::GetBaseFloatSettingValue(section.c_str(), key.c_str(), default_value);

  if (sif)
  {
    Accessor::makeNullableFloat(widget, value);

    float sif_value;
    if (sif->GetFloatValue(section.c_str(), key.c_str(), &sif_value))
      Accessor::setNullableFloatValue(widget, sif_value);
    else
      Accessor::setNullableFloatValue(widget, std::nullopt);

    Accessor::connectValueChanged(widget, [sif, widget, section = std::move(section), key = std::move(key)]() {
      if (std::optional<float> new_value = Accessor::getNullableFloatValue(widget); new_value.has_value())
        sif->SetFloatValue(section.c_str(), key.c_str(), new_value.value());
      else
        sif->DeleteValue(section.c_str(), key.c_str());

      sif->Save();
      g_emu_thread->reloadGameSettings();
    });
  }
  else
  {
    Accessor::setFloatValue(widget, value);

    Accessor::connectValueChanged(widget, [widget, section = std::move(section), key = std::move(key)]() {
      const float new_value = Accessor::getFloatValue(widget);
      Host::SetBaseFloatSettingValue(section.c_str(), key.c_str(), new_value);
      Host::CommitBaseSettingChanges();
      g_emu_thread->applySettings();
    });
  }
}

template<typename WidgetType>
static void BindWidgetToNormalizedSetting(SettingsInterface* sif, WidgetType* widget, std::string section,
                                          std::string key, float range, float default_value)
{
  using Accessor = SettingAccessor<WidgetType>;

  const float value = Host::GetBaseFloatSettingValue(section.c_str(), key.c_str(), default_value);

  if (sif)
  {
    Accessor::makeNullableInt(widget, static_cast<int>(value * range));

    float sif_value;
    if (sif->GetFloatValue(section.c_str(), key.c_str(), &sif_value))
      Accessor::setNullableIntValue(widget, static_cast<int>(sif_value * range));
    else
      Accessor::setNullableIntValue(widget, std::nullopt);

    Accessor::connectValueChanged(widget, [sif, widget, section = std::move(section), key = std::move(key), range]() {
      if (std::optional<int> new_value = Accessor::getNullableIntValue(widget); new_value.has_value())
        sif->SetFloatValue(section.c_str(), key.c_str(), static_cast<float>(new_value.value()) / range);
      else
        sif->DeleteValue(section.c_str(), key.c_str());

      sif->Save();
      g_emu_thread->reloadGameSettings();
    });
  }
  else
  {
    Accessor::setIntValue(widget, static_cast<int>(value * range));

    Accessor::connectValueChanged(widget, [widget, section = std::move(section), key = std::move(key), range]() {
      const float new_value = (static_cast<float>(Accessor::getIntValue(widget)) / range);
      Host::SetBaseFloatSettingValue(section.c_str(), key.c_str(), new_value);
      Host::CommitBaseSettingChanges();
      g_emu_thread->applySettings();
    });
  }
}

template<typename WidgetType>
static void BindWidgetToStringSetting(SettingsInterface* sif, WidgetType* widget, std::string section, std::string key,
                                      std::string default_value = std::string())
{
  using Accessor = SettingAccessor<WidgetType>;

  const QString value(
    QString::fromStdString(Host::GetBaseStringSettingValue(section.c_str(), key.c_str(), default_value.c_str())));

  if (sif)
  {
    Accessor::makeNullableString(widget, value);

    std::string sif_value;
    if (sif->GetStringValue(section.c_str(), key.c_str(), &sif_value))
      Accessor::setNullableStringValue(widget, QString::fromStdString(sif_value));
    else
      Accessor::setNullableStringValue(widget, std::nullopt);

    Accessor::connectValueChanged(widget, [widget, sif, section = std::move(section), key = std::move(key)]() {
      if (std::optional<QString> new_value = Accessor::getNullableStringValue(widget); new_value.has_value())
        sif->SetStringValue(section.c_str(), key.c_str(), new_value->toUtf8().constData());
      else
        sif->DeleteValue(section.c_str(), key.c_str());

      sif->Save();
      g_emu_thread->reloadGameSettings();
    });
  }
  else
  {
    Accessor::setStringValue(widget, value);

    Accessor::connectValueChanged(widget, [widget, section = std::move(section), key = std::move(key)]() {
      const QString new_value = Accessor::getStringValue(widget);
      if (!new_value.isEmpty())
        Host::SetBaseStringSettingValue(section.c_str(), key.c_str(), new_value.toUtf8().constData());
      else
        Host::DeleteBaseSettingValue(section.c_str(), key.c_str());

      Host::CommitBaseSettingChanges();
      g_emu_thread->applySettings();
    });
  }
}

template<typename WidgetType, typename DataType>
static void BindWidgetToEnumSetting(SettingsInterface* sif, WidgetType* widget, std::string section, std::string key,
                                    std::optional<DataType> (*from_string_function)(const char* str),
                                    const char* (*to_string_function)(DataType value), DataType default_value)
{
  using Accessor = SettingAccessor<WidgetType>;
  using UnderlyingType = std::underlying_type_t<DataType>;

  const std::string value(
    Host::GetBaseStringSettingValue(section.c_str(), key.c_str(), to_string_function(default_value)));
  const std::optional<DataType> typed_value = from_string_function(value.c_str());

  if (sif)
  {
    Accessor::makeNullableInt(
      widget, typed_value.has_value() ? static_cast<int>(static_cast<UnderlyingType>(typed_value.value())) : 0);

    std::string sif_value;
    if (sif->GetStringValue(section.c_str(), key.c_str(), &sif_value))
    {
      const std::optional<DataType> old_setting_value = from_string_function(sif_value.c_str());
      if (old_setting_value.has_value())
        Accessor::setNullableIntValue(widget, static_cast<int>(static_cast<UnderlyingType>(old_setting_value.value())));
      else
        Accessor::setNullableIntValue(widget, std::nullopt);
    }
    else
    {
      Accessor::setNullableIntValue(widget, std::nullopt);
    }

    Accessor::connectValueChanged(
      widget, [sif, widget, section = std::move(section), key = std::move(key), to_string_function]() {
        if (std::optional<int> new_value = Accessor::getNullableIntValue(widget); new_value.has_value())
        {
          const char* string_value =
            to_string_function(static_cast<DataType>(static_cast<UnderlyingType>(new_value.value())));
          sif->SetStringValue(section.c_str(), key.c_str(), string_value);
        }
        else
        {
          sif->DeleteValue(section.c_str(), key.c_str());
        }

        sif->Save();
        g_emu_thread->reloadGameSettings();
      });
  }
  else
  {
    if (typed_value.has_value())
      Accessor::setIntValue(widget, static_cast<int>(static_cast<UnderlyingType>(typed_value.value())));
    else
      Accessor::setIntValue(widget, static_cast<int>(static_cast<UnderlyingType>(default_value)));

    Accessor::connectValueChanged(
      widget, [widget, section = std::move(section), key = std::move(key), to_string_function]() {
        const DataType value = static_cast<DataType>(static_cast<UnderlyingType>(Accessor::getIntValue(widget)));
        const char* string_value = to_string_function(value);
        Host::SetBaseStringSettingValue(section.c_str(), key.c_str(), string_value);
        Host::CommitBaseSettingChanges();
        g_emu_thread->applySettings();
      });
  }
}

template<typename WidgetType, typename DataType>
static void BindWidgetToEnumSetting(SettingsInterface* sif, WidgetType* widget, std::string section, std::string key,
                                    const char** enum_names, DataType default_value)
{
  using Accessor = SettingAccessor<WidgetType>;
  using UnderlyingType = std::underlying_type_t<DataType>;

  const std::string value(Host::GetBaseStringSettingValue(section.c_str(), key.c_str(),
                                                          enum_names[static_cast<UnderlyingType>(default_value)]));

  UnderlyingType enum_index = static_cast<UnderlyingType>(default_value);
  for (UnderlyingType i = 0; enum_names[i] != nullptr; i++)
  {
    if (value == enum_names[i])
    {
      enum_index = i;
      break;
    }
  }

  if (sif)
  {
    Accessor::makeNullableInt(widget, static_cast<int>(enum_index));

    std::string sif_value;
    std::optional<int> sif_int_value;
    if (sif->GetStringValue(section.c_str(), key.c_str(), &sif_value))
    {
      for (UnderlyingType i = 0; enum_names[i] != nullptr; i++)
      {
        if (sif_value == enum_names[i])
        {
          sif_int_value = static_cast<int>(i);
          break;
        }
      }
    }
    Accessor::setNullableIntValue(widget, sif_int_value);

    Accessor::connectValueChanged(
      widget, [sif, widget, section = std::move(section), key = std::move(key), enum_names]() {
        if (std::optional<int> new_value = Accessor::getNullableIntValue(widget); new_value.has_value())
          sif->SetStringValue(section.c_str(), key.c_str(), enum_names[new_value.value()]);
        else
          sif->DeleteValue(section.c_str(), key.c_str());

        sif->Save();
        g_emu_thread->reloadGameSettings();
      });
  }
  else
  {
    Accessor::setIntValue(widget, static_cast<int>(enum_index));

    Accessor::connectValueChanged(widget, [widget, section = std::move(section), key = std::move(key), enum_names]() {
      const UnderlyingType value = static_cast<UnderlyingType>(Accessor::getIntValue(widget));
      Host::SetBaseStringSettingValue(section.c_str(), key.c_str(), enum_names[value]);
      Host::CommitBaseSettingChanges();
      g_emu_thread->applySettings();
    });
  }
}

template<typename WidgetType>
static void BindWidgetToEnumSetting(SettingsInterface* sif, WidgetType* widget, std::string section, std::string key,
                                    const char** enum_names, const char** enum_values, const char* default_value,
                                    const char* translation_ctx = nullptr)
{
  using Accessor = SettingAccessor<WidgetType>;

  const std::string value = Host::GetBaseStringSettingValue(section.c_str(), key.c_str(), default_value);

  for (int i = 0; enum_names[i] != nullptr; i++)
  {
    widget->addItem(translation_ctx ? qApp->translate(translation_ctx, enum_names[i]) :
                                      QString::fromUtf8(enum_names[i]));
  }

  int enum_index = -1;
  for (int i = 0; enum_values[i] != nullptr; i++)
  {
    if (value == enum_values[i])
    {
      enum_index = i;
      break;
    }
  }

  if (sif)
  {
    Accessor::makeNullableInt(widget, enum_index);

    std::string sif_value;
    std::optional<int> sif_int_value;
    if (sif->GetStringValue(section.c_str(), key.c_str(), &sif_value))
    {
      for (int i = 0; enum_values[i] != nullptr; i++)
      {
        if (sif_value == enum_values[i])
        {
          sif_int_value = i;
          break;
        }
      }
    }
    Accessor::setNullableIntValue(widget, sif_int_value);

    Accessor::connectValueChanged(
      widget, [sif, widget, section = std::move(section), key = std::move(key), enum_values]() {
        if (std::optional<int> new_value = Accessor::getNullableIntValue(widget); new_value.has_value())
          sif->SetStringValue(section.c_str(), key.c_str(), enum_values[new_value.value()]);
        else
          sif->DeleteValue(section.c_str(), key.c_str());

        sif->Save();
        g_emu_thread->reloadGameSettings();
      });
  }
  else
  {
    if (enum_index >= 0)
      Accessor::setIntValue(widget, enum_index);

    Accessor::connectValueChanged(widget, [widget, section = std::move(section), key = std::move(key), enum_values]() {
      const int value = Accessor::getIntValue(widget);
      Host::SetBaseStringSettingValue(section.c_str(), key.c_str(), enum_values[value]);
      Host::CommitBaseSettingChanges();
      g_emu_thread->applySettings();
    });
  }
}

static inline void BindWidgetToFolderSetting(SettingsInterface* sif, QLineEdit* widget, QAbstractButton* browse_button,
                                             QAbstractButton* open_button, QAbstractButton* reset_button,
                                             std::string section, std::string key, std::string default_value,
                                             bool use_relative = true)
{
  using Accessor = SettingAccessor<QLineEdit>;

  std::string current_path(Host::GetBaseStringSettingValue(section.c_str(), key.c_str(), default_value.c_str()));
  if (current_path.empty())
    current_path = default_value;
  else if (use_relative && !Path::IsAbsolute(current_path))
    current_path = Path::Canonicalize(Path::Combine(EmuFolders::DataRoot, current_path));
  const QString value(QString::fromStdString(current_path));
  Accessor::setStringValue(widget, value);
  // if we're doing per-game settings, disable the widget, we only allow folder changes in the base config
  if (sif)
  {
    widget->setEnabled(false);
    if (browse_button)
      browse_button->setEnabled(false);
    if (reset_button)
      reset_button->setEnabled(false);
    return;
  }

  auto value_changed = [widget, section = std::move(section), key = std::move(key), default_value, use_relative]() {
    const std::string new_value(widget->text().toStdString());
    if (!new_value.empty())
    {
      if (FileSystem::DirectoryExists(new_value.c_str()) ||
          QMessageBox::question(
            QtUtils::GetRootWidget(widget), qApp->translate("SettingWidgetBinder", "Confirm Folder"),
            qApp
              ->translate(
                "SettingWidgetBinder",
                "The chosen directory does not currently exist:\n\n%1\n\nDo you want to create this directory?")
              .arg(QString::fromStdString(new_value)),
            QMessageBox::Yes, QMessageBox::No) == QMessageBox::Yes)
      {
        if (use_relative)
        {
          const std::string relative_path(Path::MakeRelative(new_value, EmuFolders::DataRoot));
          Host::SetBaseStringSettingValue(section.c_str(), key.c_str(), relative_path.c_str());
        }
        else
        {
          Host::SetBaseStringSettingValue(section.c_str(), key.c_str(), new_value.c_str());
        }

        Host::CommitBaseSettingChanges();
        g_emu_thread->updateEmuFolders();
        return;
      }
    }
    else
    {
      QMessageBox::critical(QtUtils::GetRootWidget(widget), qApp->translate("SettingWidgetBinder", "Error"),
                            qApp->translate("SettingWidgetBinder", "Folder path cannot be empty."));
    }

    // reset to old value
    std::string current_path(Host::GetBaseStringSettingValue(section.c_str(), key.c_str(), default_value.c_str()));
    if (current_path.empty())
      current_path = default_value;
    else if (use_relative && !Path::IsAbsolute(current_path))
      current_path = Path::Canonicalize(Path::Combine(EmuFolders::DataRoot, current_path));

    widget->setText(QString::fromStdString(current_path));
  };

  if (browse_button)
  {
    QObject::connect(browse_button, &QAbstractButton::clicked, browse_button, [widget, key, value_changed]() {
      const QString path(QDir::toNativeSeparators(QFileDialog::getExistingDirectory(
        QtUtils::GetRootWidget(widget),
        // It seems that the latter half should show the types of folders that can be selected within Settings ->
        // Folders, but right now it's broken. It would be best for localization purposes to duplicate this into
        // multiple lines, each per type of folder.
        qApp->translate("SettingWidgetBinder", "Select folder for %1").arg(QString::fromStdString(key)))));
      if (path.isEmpty())
        return;

      widget->setText(path);
      value_changed();
    });
  }
  if (open_button)
  {
    QObject::connect(open_button, &QAbstractButton::clicked, open_button, [widget]() {
      QString path(Accessor::getStringValue(widget));
      if (!path.isEmpty())
        QtUtils::OpenURL(QtUtils::GetRootWidget(widget), QUrl::fromLocalFile(path));
    });
  }
  if (reset_button)
  {
    QObject::connect(reset_button, &QAbstractButton::clicked, reset_button,
                     [widget, default_value = std::move(default_value), value_changed]() {
                       widget->setText(QString::fromStdString(default_value));
                       value_changed();
                     });
  }

  widget->connect(widget, &QLineEdit::editingFinished, widget, std::move(value_changed));
}
} // namespace SettingWidgetBinder