//  SPDX-License-Identifier: MIT
//
//  EmulationStation Desktop Edition
//  GuiSettings.cpp
//
//  User interface template for a settings GUI.
//  The saving of es_settings.xml, the reload of gamelists and some other actions are
//  also triggered to be executed here via flags set by the menu entries' lambda functions.
//

#include "guis/GuiSettings.h"

#include "CollectionSystemsManager.h"
#include "FileFilterIndex.h"
#include "Settings.h"
#include "SystemData.h"
#include "Window.h"
#include "components/HelpComponent.h"
#include "guis/GuiTextEditPopup.h"
#include "views/ViewController.h"
#include "views/gamelist/IGameListView.h"

GuiSettings::GuiSettings(Window* window, std::string title)
    : GuiComponent(window)
    , mMenu(window, title)
    , mNeedsSaving(false)
    , mNeedsReloadHelpPrompts(false)
    , mNeedsCollectionsUpdate(false)
    , mNeedsSorting(false)
    , mNeedsSortingCollections(false)
    , mNeedsResetFilters(false)
    , mNeedsReloading(false)
    , mNeedsGoToStart(false)
    , mNeedsGoToSystem(false)
    , mNeedsGoToGroupedCollections(false)
    , mInvalidateCachedBackground(false)
    , mGoToSystem(nullptr)
{
    addChild(&mMenu);
    mMenu.addButton("BACK", "back", [this] { delete this; });

    setSize(static_cast<float>(Renderer::getScreenWidth()),
            static_cast<float>(Renderer::getScreenHeight()));
    mMenu.setPosition((mSize.x - mMenu.getSize().x) / 2.0f, Renderer::getScreenHeight() * 0.13f);
}

GuiSettings::~GuiSettings()
{
    // Save on exit.
    save();
}

void GuiSettings::save()
{
    if (!mSaveFuncs.size())
        return;

    for (auto it = mSaveFuncs.cbegin(); it != mSaveFuncs.cend(); it++)
        (*it)();

    if (mNeedsSaving)
        Settings::getInstance()->saveFile();

    if (mNeedsReloadHelpPrompts)
        mWindow->reloadHelpPrompts();

    if (mNeedsCollectionsUpdate) {
        CollectionSystemsManager::get()->loadEnabledListFromSettings();
        CollectionSystemsManager::get()->updateSystemsList();
    }

    if (mNeedsSorting) {
        for (auto it = SystemData::sSystemVector.cbegin(); it != SystemData::sSystemVector.cend();
             it++) {
            if (!(!mNeedsSortingCollections && (*it)->isCollection()))
                (*it)->sortSystem(true);

            // Jump to the first row of the gamelist.
            IGameListView* gameList = ViewController::get()->getGameListView((*it)).get();
            gameList->setCursor(gameList->getFirstEntry());
        }
    }

    if (mNeedsResetFilters) {
        for (auto it = SystemData::sSystemVector.cbegin(); // Line break.
             it != SystemData::sSystemVector.cend(); it++) {
            if ((*it)->getThemeFolder() == "custom-collections") {
                for (FileData* customSystem : (*it)->getRootFolder()->getChildrenListToDisplay())
                    customSystem->getSystem()->getIndex()->resetFilters();
            }
            (*it)->getIndex()->resetFilters();
        }
    }

    if (mNeedsReloading)
        ViewController::get()->reloadAll();

    if (mNeedsGoToStart)
        ViewController::get()->goToStart();

    if (mNeedsGoToSystem)
        ViewController::get()->goToSystem(mGoToSystem, false);

    if (mNeedsGoToGroupedCollections) {
        bool groupedSystemExists = false;
        for (SystemData* system : SystemData::sSystemVector) {
            if (system->getThemeFolder() == "custom-collections") {
                ViewController::get()->goToSystem(system, false);
                groupedSystemExists = true;
                continue;
            }
        }
        if (!groupedSystemExists)
            // No grouped custom collection system exists, so go to the first system instead.
            ViewController::get()->goToSystem(SystemData::sSystemVector.front(), false);
    }

    if (mNeedsCollectionsUpdate) {
        auto state = ViewController::get()->getState();
        // If we're in any view other than the grouped custom collections, always jump to the
        // system view in case of any collection updates. This is overkill in some instances but
        // these views can behave a bit strange during collection changes so it's better to be on
        // the safe side.
        if (state.getSystem()->isCollection() &&
            state.getSystem()->getThemeFolder() != "custom-collections") {
            ViewController::get()->goToStart();
            ViewController::get()->goToSystem(SystemData::sSystemVector.front(), false);
            // We don't want to invalidate the cached background when there has been a collection
            // systen change as that may show a black screen in some circumstances.
            return;
        }
        // If the last displayed custom collection was just disabled, then go to start (to the
        // system view).
        if (std::find(SystemData::sSystemVector.begin(), SystemData::sSystemVector.end(),
                      state.getSystem()) == SystemData::sSystemVector.end()) {
            ViewController::get()->goToStart();
            return;
        }
    }

    if (mInvalidateCachedBackground) {
        // This delay reduces the likelyhood that the SVG rasterizer which is running in a
        // separate thread is not done until the cached background is invalidated. Without
        // this delay there's a high chance that some theme elements are not rendered in
        // time and thus not getting included in the regenerated cached background.
        // This is just a hack though and a better mechanism is needed to handle this.
        SDL_Delay(100);
        mWindow->invalidateCachedBackground();
    }
}

void GuiSettings::addEditableTextComponent(const std::string label,
                                           std::shared_ptr<GuiComponent> ed,
                                           std::string value,
                                           std::string defaultValue,
                                           bool isPassword)
{
    ComponentListRow row;
    row.elements.clear();

    auto lbl = std::make_shared<TextComponent>(mWindow, Utils::String::toUpper(label),
                                               Font::get(FONT_SIZE_MEDIUM), 0x777777FF);

    row.addElement(lbl, true);
    row.addElement(ed, true);

    auto spacer = std::make_shared<GuiComponent>(mWindow);
    spacer->setSize(Renderer::getScreenWidth() * 0.005f, 0);
    row.addElement(spacer, false);

    auto bracket = std::make_shared<ImageComponent>(mWindow);
    bracket->setImage(":/graphics/arrow.svg");
    bracket->setResize(glm::vec2(0.0f, lbl->getFont()->getLetterHeight()));
    row.addElement(bracket, false);

    // OK callback (apply new value to ed).
    auto updateVal = [ed, defaultValue, isPassword](const std::string& newVal) {
        // If the field is blank, apply the default value if it's been passes as an argument.
        if (defaultValue != "" && newVal == "") {
            ed->setValue(defaultValue);
        }
        // If it's a password and actually set to something, then show a star mask.
        else if (isPassword && newVal == "") {
            ed->setValue("");
            ed->setHiddenValue("");
        }
        else if (isPassword) {
            ed->setValue("********");
            ed->setHiddenValue(newVal);
        }
        else {
            ed->setValue(newVal);
        }
    };

    row.makeAcceptInputHandler([this, label, ed, updateVal, isPassword] {
        // Never display the value if it's a password, instead set it to blank.
        if (isPassword)
            mWindow->pushGui(
                new GuiTextEditPopup(mWindow, getHelpStyle(), label, "", updateVal, false));
        else
            mWindow->pushGui(new GuiTextEditPopup(mWindow, getHelpStyle(), label, ed->getValue(),
                                                  updateVal, false));
    });
    assert(ed);
    addRow(row);

    ed->setValue(value);
}

bool GuiSettings::input(InputConfig* config, Input input)
{
    if (config->isMappedTo("b", input) && input.value != 0) {
        delete this;
        return true;
    }

    return GuiComponent::input(config, input);
}

HelpStyle GuiSettings::getHelpStyle()
{
    HelpStyle style = HelpStyle();
    style.applyTheme(ViewController::get()->getState().getSystem()->getTheme(), "system");
    return style;
}

std::vector<HelpPrompt> GuiSettings::getHelpPrompts()
{
    std::vector<HelpPrompt> prompts = mMenu.getHelpPrompts();
    prompts.push_back(HelpPrompt("b", "back"));
    return prompts;
}