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

#include "settingswindow.h"
#include "advancedsettingswidget.h"
#include "audiosettingswidget.h"
#include "biossettingswidget.h"
#include "consolesettingswidget.h"

#include "achievementsettingswidget.h"
#include "displaysettingswidget.h"
#include "emulationsettingswidget.h"
#include "enhancementsettingswidget.h"
#include "foldersettingswidget.h"
#include "gamelistsettingswidget.h"
#include "gamesummarywidget.h"
#include "generalsettingswidget.h"
#include "mainwindow.h"
#include "memorycardsettingswidget.h"
#include "postprocessingsettingswidget.h"
#include "qthost.h"

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

#include "util/ini_settings_interface.h"

#include "common/assert.h"
#include "common/error.h"
#include "common/file_system.h"
#include "common/log.h"

#include <QtGui/QWheelEvent>
#include <QtWidgets/QMessageBox>
#include <QtWidgets/QScrollBar>
#include <QtWidgets/QTextEdit>

Log_SetChannel(SettingsWindow);

static QList<SettingsWindow*> s_open_game_properties_dialogs;

SettingsWindow::SettingsWindow() : QWidget()
{
  m_ui.setupUi(this);
  setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
  addPages();
}

SettingsWindow::SettingsWindow(const std::string& path, const std::string& serial, DiscRegion region,
                               const GameDatabase::Entry* entry, std::unique_ptr<SettingsInterface> sif)
  : QWidget(), m_sif(std::move(sif))
{
  m_ui.setupUi(this);
  setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);

  addWidget(new GameSummaryWidget(path, serial, region, entry, this, m_ui.settingsContainer), tr("Summary"),
            QStringLiteral("file-list-line"),
            tr("<strong>Summary</strong><hr>This page shows information about the selected game, and allows you to "
               "validate your disc was dumped correctly."));
  addPages();

  s_open_game_properties_dialogs.push_back(this);
}

SettingsWindow::~SettingsWindow()
{
  if (isPerGameSettings())
    s_open_game_properties_dialogs.removeOne(this);
}

void SettingsWindow::addPages()
{
  addWidget(
    m_general_settings = new GeneralSettingsWidget(this, m_ui.settingsContainer), tr("General"),
    QStringLiteral("settings-3-line"),
    tr("<strong>General Settings</strong><hr>These options control how the emulator looks and "
       "behaves.<br><br>Mouse over an option for additional information, and Shift+Wheel to scroll this panel."));

  if (!isPerGameSettings())
  {
    addWidget(
      m_game_list_settings = new GameListSettingsWidget(this, m_ui.settingsContainer), tr("Game List"),
      QStringLiteral("folder-open-line"),
      tr("<strong>Game List Settings</strong><hr>The list above shows the directories which will be searched by "
         "DuckStation to populate the game list. Search directories can be added, removed, and switched to "
         "recursive/non-recursive."));
  }

  addWidget(
    m_bios_settings = new BIOSSettingsWidget(this, m_ui.settingsContainer), tr("BIOS"), QStringLiteral("chip-line"),
    tr("<strong>BIOS Settings</strong><hr>These options control which BIOS is used and how it will be "
       "patched.<br><br>Mouse over an option for additional information, and Shift+Wheel to scroll this panel."));
  addWidget(
    m_console_settings = new ConsoleSettingsWidget(this, m_ui.settingsContainer), tr("Console"),
    QStringLiteral("chip-2-line"),
    tr("<strong>Console Settings</strong><hr>These options determine the configuration of the simulated "
       "console.<br><br>Mouse over an option for additional information, and Shift+Wheel to scroll this panel."));
  addWidget(
    m_emulation_settings = new EmulationSettingsWidget(this, m_ui.settingsContainer), tr("Emulation"),
    QStringLiteral("emulation-line"),
    tr("<strong>Emulation Settings</strong><hr>These options determine the speed and runahead behavior of the "
       "system.<br><br>Mouse over an option for additional information, and Shift+Wheel to scroll this panel."));
  addWidget(
    m_memory_card_settings = new MemoryCardSettingsWidget(this, m_ui.settingsContainer), tr("Memory Cards"),
    QStringLiteral("memcard-line"),
    tr("<strong>Memory Card Settings</strong><hr>This page lets you control what mode the memory card emulation will "
       "function in, and where the images for these cards will be stored on disk."));
  addWidget(
    m_display_settings = new DisplaySettingsWidget(this, m_ui.settingsContainer), tr("Display"),
    QStringLiteral("image-fill"),
    tr("<strong>Display Settings</strong><hr>These options control the how the frames generated by the console are "
       "displayed on the screen."));
  addWidget(
    m_enhancement_settings = new EnhancementSettingsWidget(this, m_ui.settingsContainer), tr("Enhancements"),
    QStringLiteral("sparkle-fill"),
    tr("<strong>Enhancement Settings</strong><hr>These options control enhancements which can improve visuals compared "
       "to the original console. Mouse over each option for additional information, and Shift+Wheel to scroll this "
       "panel."));
  addWidget(
    m_post_processing_settings = new PostProcessingSettingsWidget(this, m_ui.settingsContainer), tr("Post-Processing"),
    QStringLiteral("sun-fill"),
    tr("<strong>Post-Processing Settings</strong><hr>Post processing allows you to alter the appearance of the image "
       "displayed on the screen with various filters. Shaders will be executed in sequence."));
  addWidget(
    m_audio_settings = new AudioSettingsWidget(this, m_ui.settingsContainer), tr("Audio"),
    QStringLiteral("volume-up-line"),
    tr("<strong>Audio Settings</strong><hr>These options control the audio output of the console. Mouse over an option "
       "for additional information."));
  {
    QString title(tr("Achievements"));
    QString icon_text(QStringLiteral("trophy-line"));
    QString help_text(tr("<strong>Achievement Settings</strong><hr>These options control RetroAchievements. Mouse over "
                         "an option for additional information, and Shift+Wheel to scroll this panel."));

    if (!Achievements::IsUsingRAIntegration())
    {
      addWidget(m_achievement_settings = new AchievementSettingsWidget(this, m_ui.settingsContainer), std::move(title),
                std::move(icon_text), std::move(help_text));
    }
    else
    {
      QLabel* placeholder_label =
        new QLabel(QStringLiteral("RAIntegration is being used, built-in RetroAchievements support is disabled."),
                   m_ui.settingsContainer);
      placeholder_label->setAlignment(Qt::AlignLeft | Qt::AlignTop);

      addWidget(placeholder_label, std::move(title), std::move(icon_text), std::move(help_text));
    }
  }

  if (!isPerGameSettings())
  {
    addWidget(
      m_folder_settings = new FolderSettingsWidget(this, m_ui.settingsContainer), tr("Folders"),
      QStringLiteral("folder-settings-line"),
      tr("<strong>Folder Settings</strong><hr>These options control where DuckStation will save runtime data files."));
  }

  addWidget(m_advanced_settings = new AdvancedSettingsWidget(this, m_ui.settingsContainer), tr("Advanced"),
            QStringLiteral("tools-line"),
            tr("<strong>Advanced Settings</strong><hr>These options control logging and internal behavior of the "
               "emulator. Mouse over an option for additional information, and Shift+Wheel to scroll this panel."));

  if (isPerGameSettings())
  {
    m_ui.buttonBox->button(QDialogButtonBox::RestoreDefaults)->setVisible(false);
  }

  m_ui.settingsCategory->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Minimum);
  m_ui.settingsCategory->setCurrentRow(0);
  m_ui.settingsContainer->setCurrentIndex(0);
  m_ui.helpText->setText(m_category_help_text[0]);
  connect(m_ui.settingsCategory, &QListWidget::currentRowChanged, this, &SettingsWindow::onCategoryCurrentRowChanged);
  connect(m_ui.buttonBox, &QDialogButtonBox::rejected, this, &SettingsWindow::close);
  connect(m_ui.buttonBox->button(QDialogButtonBox::RestoreDefaults), &QAbstractButton::clicked, this,
          &SettingsWindow::onRestoreDefaultsClicked);
}

void SettingsWindow::addWidget(QWidget* widget, QString title, QString icon, QString help_text)
{
  const int index = m_ui.settingsCategory->count();

  QListWidgetItem* item = new QListWidgetItem(m_ui.settingsCategory);
  item->setText(title);
  if (!icon.isEmpty())
    item->setIcon(QIcon::fromTheme(icon));

  m_ui.settingsContainer->addWidget(widget);

  m_category_help_text[index] = std::move(help_text);
}

void SettingsWindow::setCategory(const char* category)
{
  // the titles in the category list will be translated.
  const QString translated_category(tr(category));

  for (int i = 0; i < m_ui.settingsCategory->count(); i++)
  {
    if (translated_category == m_ui.settingsCategory->item(i)->text())
    {
      // will also update the visible widget
      m_ui.settingsCategory->setCurrentRow(i);
      break;
    }
  }
}

void SettingsWindow::onCategoryCurrentRowChanged(int row)
{
  DebugAssert(row < static_cast<int>(MAX_SETTINGS_WIDGETS));
  m_ui.settingsContainer->setCurrentIndex(row);
  m_ui.helpText->setText(m_category_help_text[row]);
}

void SettingsWindow::onRestoreDefaultsClicked()
{
  if (QMessageBox::question(this, tr("Confirm Restore Defaults"),
                            tr("Are you sure you want to restore the default settings? Any preferences will be lost."),
                            QMessageBox::Yes, QMessageBox::No) != QMessageBox::Yes)
  {
    return;
  }

  g_emu_thread->setDefaultSettings(true, false);
}

void SettingsWindow::registerWidgetHelp(QObject* object, QString title, QString recommended_value, QString text)
{
  // construct rich text with formatted description
  QString full_text;
  full_text += "<table width='100%' cellpadding='0' cellspacing='0'><tr><td><strong>";
  full_text += title;
  full_text += "</strong></td><td align='right'><strong>";
  full_text += tr("Recommended Value");
  full_text += ": </strong>";
  full_text += recommended_value;
  full_text += "</td></table><hr>";
  full_text += text;

  m_widget_help_text_map[object] = std::move(full_text);
  object->installEventFilter(this);
}

bool SettingsWindow::eventFilter(QObject* object, QEvent* event)
{
  if (event->type() == QEvent::Enter)
  {
    auto iter = m_widget_help_text_map.constFind(object);
    if (iter != m_widget_help_text_map.end())
    {
      m_current_help_widget = object;
      m_ui.helpText->setText(iter.value());
    }
  }
  else if (event->type() == QEvent::Leave)
  {
    if (m_current_help_widget)
    {
      m_current_help_widget = nullptr;
      m_ui.helpText->setText(m_category_help_text[m_ui.settingsCategory->currentRow()]);
    }
  }
  else if (event->type() == QEvent::Wheel)
  {
    if (handleWheelEvent(static_cast<QWheelEvent*>(event)))
      return true;
  }

  return QWidget::eventFilter(object, event);
}

bool SettingsWindow::handleWheelEvent(QWheelEvent* event)
{
  if (!(event->modifiers() & Qt::ShiftModifier))
    return false;

  const int amount = event->hasPixelDelta() ? event->pixelDelta().y() : (event->angleDelta().y() / 20);

  QScrollBar* sb = m_ui.helpText->verticalScrollBar();
  if (!sb)
    return false;

  sb->setSliderPosition(std::max(sb->sliderPosition() - amount, 0));
  return true;
}

void SettingsWindow::wheelEvent(QWheelEvent* event)
{
  if (handleWheelEvent(event))
    return;

  QWidget::wheelEvent(event);
}

bool SettingsWindow::getEffectiveBoolValue(const char* section, const char* key, bool default_value) const
{
  bool value;
  if (m_sif && m_sif->GetBoolValue(section, key, &value))
    return value;
  else
    return Host::GetBaseBoolSettingValue(section, key, default_value);
}

int SettingsWindow::getEffectiveIntValue(const char* section, const char* key, int default_value) const
{
  int value;
  if (m_sif && m_sif->GetIntValue(section, key, &value))
    return value;
  else
    return Host::GetBaseIntSettingValue(section, key, default_value);
}

float SettingsWindow::getEffectiveFloatValue(const char* section, const char* key, float default_value) const
{
  float value;
  if (m_sif && m_sif->GetFloatValue(section, key, &value))
    return value;
  else
    return Host::GetBaseFloatSettingValue(section, key, default_value);
}

std::string SettingsWindow::getEffectiveStringValue(const char* section, const char* key,
                                                    const char* default_value) const
{
  std::string value;
  if (!m_sif || !m_sif->GetStringValue(section, key, &value))
    value = Host::GetBaseStringSettingValue(section, key, default_value);
  return value;
}

Qt::CheckState SettingsWindow::getCheckState(const char* section, const char* key, bool default_value)
{
  bool value;
  if (m_sif)
  {
    if (!m_sif->GetBoolValue(section, key, &value))
      return Qt::PartiallyChecked;
  }
  else
  {
    value = Host::GetBaseBoolSettingValue(section, key, default_value);
  }

  return value ? Qt::Checked : Qt::Unchecked;
}

std::optional<bool> SettingsWindow::getBoolValue(const char* section, const char* key,
                                                 std::optional<bool> default_value) const
{
  std::optional<bool> value;
  if (m_sif)
  {
    bool bvalue;
    if (m_sif->GetBoolValue(section, key, &bvalue))
      value = bvalue;
    else
      value = default_value;
  }
  else
  {
    value = Host::GetBaseBoolSettingValue(section, key, default_value.value_or(false));
  }

  return value;
}

std::optional<int> SettingsWindow::getIntValue(const char* section, const char* key,
                                               std::optional<int> default_value) const
{
  std::optional<int> value;
  if (m_sif)
  {
    int ivalue;
    if (m_sif->GetIntValue(section, key, &ivalue))
      value = ivalue;
    else
      value = default_value;
  }
  else
  {
    value = Host::GetBaseIntSettingValue(section, key, default_value.value_or(0));
  }

  return value;
}

std::optional<float> SettingsWindow::getFloatValue(const char* section, const char* key,
                                                   std::optional<float> default_value) const
{
  std::optional<float> value;
  if (m_sif)
  {
    float fvalue;
    if (m_sif->GetFloatValue(section, key, &fvalue))
      value = fvalue;
    else
      value = default_value;
  }
  else
  {
    value = Host::GetBaseFloatSettingValue(section, key, default_value.value_or(0.0f));
  }

  return value;
}

std::optional<std::string> SettingsWindow::getStringValue(const char* section, const char* key,
                                                          std::optional<const char*> default_value) const
{
  std::optional<std::string> value;
  if (m_sif)
  {
    std::string svalue;
    if (m_sif->GetStringValue(section, key, &svalue))
      value = std::move(svalue);
    else if (default_value.has_value())
      value = default_value.value();
  }
  else
  {
    value = Host::GetBaseStringSettingValue(section, key, default_value.value_or(""));
  }

  return value;
}

void SettingsWindow::setBoolSettingValue(const char* section, const char* key, std::optional<bool> value)
{
  if (m_sif)
  {
    value.has_value() ? m_sif->SetBoolValue(section, key, value.value()) : m_sif->DeleteValue(section, key);
    m_sif->Save();
    g_emu_thread->reloadGameSettings();
  }
  else
  {
    value.has_value() ? Host::SetBaseBoolSettingValue(section, key, value.value()) :
                        Host::DeleteBaseSettingValue(section, key);
    Host::CommitBaseSettingChanges();
    g_emu_thread->applySettings();
  }
}

void SettingsWindow::setIntSettingValue(const char* section, const char* key, std::optional<int> value)
{
  if (m_sif)
  {
    value.has_value() ? m_sif->SetIntValue(section, key, value.value()) : m_sif->DeleteValue(section, key);
    m_sif->Save();
    g_emu_thread->reloadGameSettings();
  }
  else
  {
    value.has_value() ? Host::SetBaseIntSettingValue(section, key, value.value()) :
                        Host::DeleteBaseSettingValue(section, key);
    Host::CommitBaseSettingChanges();
    g_emu_thread->applySettings();
  }
}

void SettingsWindow::setFloatSettingValue(const char* section, const char* key, std::optional<float> value)
{
  if (m_sif)
  {
    value.has_value() ? m_sif->SetFloatValue(section, key, value.value()) : m_sif->DeleteValue(section, key);
    m_sif->Save();
    g_emu_thread->reloadGameSettings();
  }
  else
  {
    value.has_value() ? Host::SetBaseFloatSettingValue(section, key, value.value()) :
                        Host::DeleteBaseSettingValue(section, key);
    Host::CommitBaseSettingChanges();
    g_emu_thread->applySettings();
  }
}

void SettingsWindow::setStringSettingValue(const char* section, const char* key, std::optional<const char*> value)
{
  if (m_sif)
  {
    value.has_value() ? m_sif->SetStringValue(section, key, value.value()) : m_sif->DeleteValue(section, key);
    m_sif->Save();
    g_emu_thread->reloadGameSettings();
  }
  else
  {
    value.has_value() ? Host::SetBaseStringSettingValue(section, key, value.value()) :
                        Host::DeleteBaseSettingValue(section, key);
    Host::CommitBaseSettingChanges();
    g_emu_thread->applySettings();
  }
}

void SettingsWindow::removeSettingValue(const char* section, const char* key)
{
  if (m_sif)
  {
    m_sif->DeleteValue(section, key);
    m_sif->Save();
    g_emu_thread->reloadGameSettings();
  }
  else
  {
    Host::DeleteBaseSettingValue(section, key);
    Host::CommitBaseSettingChanges();
    g_emu_thread->applySettings();
  }
}

void SettingsWindow::openGamePropertiesDialog(const std::string& path, const std::string& serial, DiscRegion region)
{
  const GameDatabase::Entry* dentry = nullptr;
  if (!System::IsExeFileName(path) && !System::IsPsfFileName(path))
  {
    // Need to resolve hash games.
    Error error;
    std::unique_ptr<CDImage> image = CDImage::Open(path.c_str(), false, &error);
    if (image)
      dentry = GameDatabase::GetEntryForDisc(image.get());
    else
      Log_ErrorFmt("Failed to open '{}' for game properties: {}", path, error.GetDescription());

    if (!dentry)
    {
      // Use the serial and hope for the best...
      dentry = GameDatabase::GetEntryForSerial(serial);
    }
  }

  const std::string& real_serial = dentry ? dentry->serial : serial;
  std::string ini_filename = System::GetGameSettingsPath(real_serial);

  // check for an existing dialog with this crc
  for (SettingsWindow* dialog : s_open_game_properties_dialogs)
  {
    if (dialog->isPerGameSettings() &&
        static_cast<INISettingsInterface*>(dialog->getSettingsInterface())->GetFileName() == ini_filename)
    {
      dialog->show();
      dialog->raise();
      dialog->activateWindow();
      dialog->setFocus();
      return;
    }
  }

  std::unique_ptr<INISettingsInterface> sif = std::make_unique<INISettingsInterface>(std::move(ini_filename));
  if (FileSystem::FileExists(sif->GetFileName().c_str()))
    sif->Load();

  const QString window_title(tr("%1 [%2]")
                               .arg(dentry ? QtUtils::StringViewToQString(dentry->title) : QStringLiteral("<UNKNOWN>"))
                               .arg(QtUtils::StringViewToQString(real_serial)));

  SettingsWindow* dialog = new SettingsWindow(path, real_serial, region, dentry, std::move(sif));
  dialog->setWindowTitle(window_title);
  dialog->show();
}

void SettingsWindow::closeGamePropertiesDialogs()
{
  for (SettingsWindow* dialog : s_open_game_properties_dialogs)
  {
    dialog->close();
    dialog->deleteLater();
  }
}