ES-DE/es-app/src/views/ViewController.cpp

//
//  ViewController.cpp
//
//  Handles overall system navigation including animations and transitions.
//  Also creates the gamelist views and handles refresh and reloads of these when needed
//  (for example when metadata has been changed or when a list sorting has taken place).
//  Initiates the launching of games, calling FileData to do the actual launch.
//

#include "views/ViewController.h"

#include "animations/Animation.h"
#include "animations/LambdaAnimation.h"
#include "animations/LaunchAnimation.h"
#include "animations/MoveCameraAnimation.h"
#include "guis/GuiMenu.h"
#include "views/gamelist/DetailedGameListView.h"
#include "views/gamelist/IGameListView.h"
#include "views/gamelist/GridGameListView.h"
#include "views/gamelist/VideoGameListView.h"
#include "views/SystemView.h"
#include "views/UIModeController.h"
#include "FileFilterIndex.h"
#include "Log.h"
#include "Settings.h"
#include "SystemData.h"
#include "Window.h"
#include "Sound.h"

ViewController* ViewController::sInstance = nullptr;

ViewController* ViewController::get()
{
    assert(sInstance);
    return sInstance;
}

void ViewController::init(Window* window)
{
    assert(!sInstance);
    sInstance = new ViewController(window);
}

ViewController::ViewController(
        Window* window)
        : GuiComponent(window),
        mCurrentView(nullptr),
        mCamera(Transform4x4f::Identity()),
        mFadeOpacity(0),
        mLockInput(false)
{
    mState.viewing = NOTHING;
}

ViewController::~ViewController()
{
    assert(sInstance == this);
    sInstance = nullptr;
}

void ViewController::goToStart()
{
    // If a specific system is requested, go directly to its game list.
    auto requestedSystem = Settings::getInstance()->getString("StartupSystem");
    if ("" != requestedSystem && "retropie" != requestedSystem) {
        for (auto it = SystemData::sSystemVector.cbegin();
                it != SystemData::sSystemVector.cend(); it++) {
            if ((*it)->getName() == requestedSystem) {
                goToGameList(*it);
                return;
            }
        }

        // Requested system doesn't exist.
        Settings::getInstance()->setString("StartupSystem", "");
    }
    goToSystemView(SystemData::sSystemVector.at(0));
}

void ViewController::ReloadAndGoToStart()
{
    mWindow->renderLoadingScreen("Loading...");
    ViewController::get()->reloadAll();
    ViewController::get()->goToStart();
}

int ViewController::getSystemId(SystemData* system)
{
    std::vector<SystemData*>& sysVec = SystemData::sSystemVector;
    return (int)(std::find(sysVec.cbegin(), sysVec.cend(), system) - sysVec.cbegin());
}

void ViewController::goToSystemView(SystemData* system)
{
    // Tell any current view it's about to be hidden.
    if (mCurrentView)
        mCurrentView->onHide();

    mState.viewing = SYSTEM_SELECT;
    mState.system = system;

    auto systemList = getSystemListView();
    systemList->setPosition(getSystemId(system) * (float)Renderer::getScreenWidth(),
            systemList->getPosition().y());

    systemList->goToSystem(system, false);
    mCurrentView = systemList;
    mCurrentView->onShow();
    PowerSaver::setState(true);

    playViewTransition();
}

void ViewController::goToNextGameList()
{
    assert(mState.viewing == GAME_LIST);
    SystemData* system = getState().getSystem();
    assert(system);
    NavigationSounds::getInstance()->playThemeNavigationSound(QUICKSYSSELECTSOUND);
    goToGameList(system->getNext());
}

void ViewController::goToPrevGameList()
{
    assert(mState.viewing == GAME_LIST);
    SystemData* system = getState().getSystem();
    assert(system);
    NavigationSounds::getInstance()->playThemeNavigationSound(QUICKSYSSELECTSOUND);
    goToGameList(system->getPrev());
}

void ViewController::goToGameList(SystemData* system)
{
    if (mState.viewing == SYSTEM_SELECT) {
        // Move system list.
        auto sysList = getSystemListView();
        float offX = sysList->getPosition().x();
        int sysId = getSystemId(system);

        sysList->setPosition(sysId * (float)Renderer::getScreenWidth(),
                sysList->getPosition().y());
        offX = sysList->getPosition().x() - offX;
        mCamera.translation().x() -= offX;
    }

    mState.viewing = GAME_LIST;
    mState.system = system;

    if (mCurrentView)
        mCurrentView->onHide();

    mCurrentView = getGameListView(system);

    if (mCurrentView)
        mCurrentView->onShow();
    playViewTransition();
}

void ViewController::playViewTransition()
{
    Vector3f target(Vector3f::Zero());
    if (mCurrentView)
        target = mCurrentView->getPosition();

    // No need to animate, we're not going anywhere (probably due to goToNextGamelist()
    // or goToPrevGamelist() being called when there's only 1 system).
    if (target == -mCamera.translation() && !isAnimationPlaying(0))
        return;

    std::string transition_style = Settings::getInstance()->getString("TransitionStyle");

    if (transition_style == "fade") {
        // Fade.
        // Stop whatever's currently playing, leaving mFadeOpacity wherever it is.
        cancelAnimation(0);

        auto fadeFunc = [this](float t) {
            mFadeOpacity = Math::lerp(0, 1, t);
        };

        const static int FADE_DURATION = 240; // Fade in/out time.
        const static int FADE_WAIT = 320; // Time to wait between in/out.
        setAnimation(new LambdaAnimation(fadeFunc, FADE_DURATION), 0, [this, fadeFunc, target] {
            this->mCamera.translation() = -target;
            updateHelpPrompts();
            setAnimation(new LambdaAnimation(fadeFunc, FADE_DURATION), FADE_WAIT, nullptr, true);
        });

        // Fast-forward animation if we're partway faded.
        if (target == -mCamera.translation()) {
            // Not changing screens, so cancel the first half entirely.
            advanceAnimation(0, FADE_DURATION);
            advanceAnimation(0, FADE_WAIT);
            advanceAnimation(0, FADE_DURATION - (int)(mFadeOpacity * FADE_DURATION));
        }
        else {
            advanceAnimation(0, (int)(mFadeOpacity * FADE_DURATION));
        }
    }
    else if (transition_style == "slide") {
        // Slide or simple slide.
        setAnimation(new MoveCameraAnimation(mCamera, target));
        updateHelpPrompts(); // Update help prompts immediately.
    }
    else {
        // Instant.
        setAnimation(new LambdaAnimation([this, target](float /*t*/) {
                    this->mCamera.translation() = -target; }, 1));
        updateHelpPrompts();
    }
}

void ViewController::onFileChanged(FileData* file, FileChangeType change)
{
    auto it = mGameListViews.find(file->getSystem());
    if (it != mGameListViews.cend())
        it->second->onFileChanged(file, change);
}

void ViewController::launch(FileData* game, Vector3f center)
{
    if (game->getType() != GAME) {
        LOG(LogError) << "tried to launch something that isn't a game";
        return;
    }

    // Hide the current view.
    if (mCurrentView)
        mCurrentView->onHide();

    Transform4x4f origCamera = mCamera;
    origCamera.translation() = -mCurrentView->getPosition();

    center += mCurrentView->getPosition();
    stopAnimation(1); // Make sure the fade in isn't still playing.
    mWindow->stopInfoPopup(); // Make sure we disable any existing info popup.
    mLockInput = true;

    std::string transition_style = Settings::getInstance()->getString("TransitionStyle");

    NavigationSounds::getInstance()->playThemeNavigationSound(LAUNCHSOUND);
    // Let launch sound play to the end before launching game.
    while (NavigationSounds::getInstance()->isPlayingThemeNavigationSound(LAUNCHSOUND));

    if (transition_style == "fade") {
        // Fade out, launch game, fade back in.
        auto fadeFunc = [this](float t) {
            mFadeOpacity = Math::lerp(0.0f, 1.0f, t);
        };
        setAnimation(new LambdaAnimation(fadeFunc, 800), 0, [this, game, fadeFunc] {
            game->launchGame(mWindow);
            setAnimation(new LambdaAnimation(fadeFunc, 800), 0, [this] {
                        mLockInput = false; }, true);
            this->onFileChanged(game, FILE_METADATA_CHANGED);
            if (mCurrentView)
                mCurrentView->onShow();
        });
    }
    else if (transition_style == "slide") {
        // Move camera to zoom in on center + fade out, launch game, come back in.
        setAnimation(new LaunchAnimation(mCamera, mFadeOpacity, center, 1500), 0,
                [this, origCamera, center, game] {
            game->launchGame(mWindow);
            mCamera = origCamera;
            setAnimation(new LaunchAnimation(mCamera, mFadeOpacity, center, 600), 0, [this] {
                        mLockInput = false; }, true);
            this->onFileChanged(game, FILE_METADATA_CHANGED);
            if (mCurrentView)
                mCurrentView->onShow();
        });
    }
    // Instant
    else {
        setAnimation(new LaunchAnimation(mCamera, mFadeOpacity, center, 10), 0,
                [this, origCamera, center, game] {
            game->launchGame(mWindow);
            mCamera = origCamera;
            setAnimation(new LaunchAnimation(mCamera, mFadeOpacity, center, 10), 0,
                    [this] { mLockInput = false; }, true);
            this->onFileChanged(game, FILE_METADATA_CHANGED);
            if (mCurrentView)
                mCurrentView->onShow();
        });
    }
}

void ViewController::removeGameListView(SystemData* system)
{
    auto exists = mGameListViews.find(system);
    if (exists != mGameListViews.cend()) {
        exists->second.reset();
        mGameListViews.erase(system);
    }
}

std::shared_ptr<IGameListView> ViewController::getGameListView(SystemData* system)
{
    // If we already made one, return that one.
    auto exists = mGameListViews.find(system);
    if (exists != mGameListViews.cend())
        return exists->second;

    system->getIndex()->setUIModeFilters();
    // If we didn't, make it, remember it, and return it.
    std::shared_ptr<IGameListView> view;

    bool themeHasVideoView = system->getTheme()->hasView("video");

    // Decide type.
    GameListViewType selectedViewType = AUTOMATIC;

    std::string viewPreference = Settings::getInstance()->getString("GamelistViewStyle");
    if (viewPreference.compare("basic") == 0)
        selectedViewType = BASIC;
    if (viewPreference.compare("detailed") == 0)
        selectedViewType = DETAILED;
    if (viewPreference.compare("grid") == 0)
        selectedViewType = GRID;
    if (viewPreference.compare("video") == 0)
        selectedViewType = VIDEO;

    if (selectedViewType == AUTOMATIC) {
        std::vector<FileData*> files = system->getRootFolder()->getFilesRecursive(GAME | FOLDER);
        for (auto it = files.cbegin(); it != files.cend(); it++) {
            if (themeHasVideoView && !(*it)->getVideoPath().empty()) {
                selectedViewType = VIDEO;
                break;
            }
            else if (!(*it)->getImagePath().empty()) {
                selectedViewType = DETAILED;
                // Don't break out in case any subsequent files have videos.
            }
        }
    }

    // Create the view.
    switch (selectedViewType)
    {
        case VIDEO:
            view = std::shared_ptr<IGameListView>(
                    new VideoGameListView(mWindow, system->getRootFolder()));
            break;
        case DETAILED:
            view = std::shared_ptr<IGameListView>(
                    new DetailedGameListView(mWindow, system->getRootFolder()));
            break;
        case GRID:
            view = std::shared_ptr<IGameListView>(
                    new GridGameListView(mWindow, system->getRootFolder()));
            break;
        case BASIC:
        default:
            view = std::shared_ptr<IGameListView>(
                    new BasicGameListView(mWindow, system->getRootFolder()));
            break;
    }

    view->setTheme(system->getTheme());

    std::vector<SystemData*>& sysVec = SystemData::sSystemVector;
    int id = (int)(std::find(sysVec.cbegin(), sysVec.cend(), system) - sysVec.cbegin());
    view->setPosition(id * (float)Renderer::getScreenWidth(),
            (float)Renderer::getScreenHeight() * 2);

    addChild(view.get());

    mGameListViews[system] = view;
    return view;
}

std::shared_ptr<SystemView> ViewController::getSystemListView()
{
    // If we already made one, return that one.
    if (mSystemListView)
        return mSystemListView;

    mSystemListView = std::shared_ptr<SystemView>(new SystemView(mWindow));
    addChild(mSystemListView.get());
    mSystemListView->setPosition(0, (float)Renderer::getScreenHeight());
    return mSystemListView;
}


bool ViewController::input(InputConfig* config, Input input)
{
    if (mLockInput)
        return true;

    // Open menu.
    if (!(UIModeController::getInstance()->isUIModeKid() &&
            !Settings::getInstance()->getBool("ShowKidStartMenu")) &&
            config->isMappedTo("start", input) && input.value != 0) {
        // If we don't stop the scrolling here, it will continue to
        // run after closing the menu.
        if (mSystemListView->isScrolling())
            mSystemListView->stopScrolling();
        // Finish the animation too, so that it doesn't continue
        // to play when we've closed the menu.
        if (mSystemListView->isAnimationPlaying(0))
            mSystemListView->finishAnimation(0);

        mWindow->pushGui(new GuiMenu(mWindow));
        return true;
    }

    // Check if UI mode has changed due to passphrase completion.
    if (UIModeController::getInstance()->listen(config, input))
        return true;

    if (mCurrentView)
        return mCurrentView->input(config, input);

    return false;
}

void ViewController::update(int deltaTime)
{
    if (mCurrentView)
        mCurrentView->update(deltaTime);

    updateSelf(deltaTime);
}

void ViewController::render(const Transform4x4f& parentTrans)
{
    Transform4x4f trans = mCamera * parentTrans;
    Transform4x4f transInverse;
    transInverse.invert(trans);

    // Camera position, position + size.
    Vector3f viewStart = transInverse.translation();
    Vector3f viewEnd = transInverse * Vector3f((float)Renderer::getScreenWidth(),
            (float)Renderer::getScreenHeight(), 0);

    // Keep track of UI mode changes.
    UIModeController::getInstance()->monitorUIMode();

    // Draw system view.
    getSystemListView()->render(trans);

    // Draw gamelists.
    for (auto it = mGameListViews.cbegin(); it != mGameListViews.cend(); it++) {
        // Clipping.
        Vector3f guiStart = it->second->getPosition();
        Vector3f guiEnd = it->second->getPosition() + Vector3f(it->second->getSize().x(),
                it->second->getSize().y(), 0);

        if (guiEnd.x() >= viewStart.x() && guiEnd.y() >= viewStart.y() &&
                guiStart.x() <= viewEnd.x() && guiStart.y() <= viewEnd.y())
            it->second->render(trans);
    }

    if (mWindow->peekGui() == this)
        mWindow->renderHelpPromptsEarly();

    // Fade out.
    if (mFadeOpacity) {
        unsigned int fadeColor = 0x00000000 | (unsigned char)(mFadeOpacity * 255);
        Renderer::setMatrix(parentTrans);
        Renderer::drawRect(0.0f, 0.0f, Renderer::getScreenWidth(),
                Renderer::getScreenHeight(), fadeColor, fadeColor);
    }
}

void ViewController::preload()
{
    uint32_t i = 0;
    for (auto it = SystemData::sSystemVector.cbegin();
            it != SystemData::sSystemVector.cend(); it++) {
        if (Settings::getInstance()->getBool("SplashScreen") &&
            Settings::getInstance()->getBool("SplashScreenProgress")) {
            i++;
            char buffer[100];
            sprintf (buffer, "Loading '%s' (%d/%d)",
                (*it)->getFullName().c_str(), i, (int)SystemData::sSystemVector.size());
            mWindow->renderLoadingScreen(std::string(buffer));
        }

        (*it)->getIndex()->resetFilters();
        getGameListView(*it);
    }
    // Load navigation sounds, but only if at least one system exists.
    if (SystemData::sSystemVector.size() > 0)
        NavigationSounds::getInstance()->loadThemeNavigationSounds(
                SystemData::sSystemVector.front()->getTheme());
}

void ViewController::reloadGameListView(IGameListView* view, bool reloadTheme)
{
    for (auto it = mGameListViews.cbegin(); it != mGameListViews.cend(); it++) {
        if (it->second.get() == view) {
            bool isCurrent = (mCurrentView == it->second);
            SystemData* system = it->first;
            FileData* cursor = view->getCursor();
            mGameListViews.erase(it);

            if (reloadTheme)
                system->loadTheme();
            system->getIndex()->setUIModeFilters();
            std::shared_ptr<IGameListView> newView = getGameListView(system);

            // To counter having come from a placeholder.
            if (!cursor->isPlaceHolder()) {
                newView->setCursor(cursor);
            }
            if (isCurrent)
                mCurrentView = newView;

            break;
        }
    }
    // Redisplay the current view.
    if (mCurrentView)
        mCurrentView->onShow();
}

void ViewController::reloadAll()
{
    // Clear all GameListViews.
    std::map<SystemData*, FileData*> cursorMap;
    for (auto it = mGameListViews.cbegin(); it != mGameListViews.cend(); it++)
        cursorMap[it->first] = it->second->getCursor();

    mGameListViews.clear();

    // Load themes, create GameListViews and reset filters.
    for (auto it = cursorMap.cbegin(); it != cursorMap.cend(); it++) {
        it->first->loadTheme();
        it->first->getIndex()->resetFilters();
        getGameListView(it->first)->setCursor(it->second);
    }

    // Rebuild SystemListView.
    mSystemListView.reset();
    getSystemListView();

    // Update mCurrentView since the pointers changed.
    if (mState.viewing == GAME_LIST) {
        mCurrentView = getGameListView(mState.getSystem());
    }
    else if (mState.viewing == SYSTEM_SELECT) {
        SystemData* system = mState.getSystem();
        goToSystemView(SystemData::sSystemVector.front());
        mSystemListView->goToSystem(system, false);
        mCurrentView = mSystemListView;
    }
    else {
        goToSystemView(SystemData::sSystemVector.front());
    }

    // Load navigation sounds.
    NavigationSounds::getInstance()->deinit();
    NavigationSounds::getInstance()->loadThemeNavigationSounds(
            SystemData::sSystemVector.front()->getTheme());

    updateHelpPrompts();
}

std::vector<HelpPrompt> ViewController::getHelpPrompts()
{
    std::vector<HelpPrompt> prompts;
    if (!mCurrentView)
        return prompts;

    prompts = mCurrentView->getHelpPrompts();
    if (!(UIModeController::getInstance()->isUIModeKid() &&
            !Settings::getInstance()->getBool("ShowKidStartMenu")))
        prompts.push_back(HelpPrompt("start", "menu"));
    return prompts;
}

HelpStyle ViewController::getHelpStyle()
{
    if (!mCurrentView)
        return GuiComponent::getHelpStyle();

    return mCurrentView->getHelpStyle();
}