#include "NavigationController.h"
#include <controllers/SettingsHandler.h>

#include <QDir>
#include <QDebug>
#include <EnergySaver.h>

#include <models/NavigationItemModel.h>
#include <models/NavigationListModel.h>
#include <models/UiStateModel.h>
#include <controllers/MusicPlayer.h>

NavigationController::NavigationController(QObject *parent) : QObject(parent),
    mRootItem(new NavigationItemModel(this)),
    mNavList(new NavigationListModel(this)),
    mUiState(new UiStateModel(this)),
    mMediaPlayer(new MusicPlayer(this))
{
    connect(mMediaPlayer, &MusicPlayer::navigateTo, [this](NavigationItemModel* item) {
        mUiState->showNavigation();
        mNavList->navigateTo(item);
    });
    /* Connect player state to energy saver to prevent device shutdown while playing music.
     */
    connect(mMediaPlayer, &MusicPlayer::isPlayingChanged, this, &NavigationController::startOrStopEnergySaverDependingOnPlayerState);
}

void NavigationController::setDebugOutput(const QString& text)
{
    mDebugOutput = text;
    emit debugOutputChanged();
}

void NavigationController::init(const QString &rootPath)
{
    auto rootDir = QDir(rootPath);
    if(!rootDir.exists()) return;
    mRootPath =  rootPath;

    add(mRootPath, mRootItem);

    mNavList->setModelItems(mRootItem->getChildren());
}

void NavigationController::setUiProfile(const QString &profileString)
{
    mUiState->setProfile(profileString);
}

void NavigationController::setContext(QQmlContext *context)
{
    mContext = context;
    setContextProperties();
}

void NavigationController::setContextProperties()
{
    if(!mContext) return;
    mContext->setContextProperty("navigationList", mNavList);
    mContext->setContextProperty("uiStateModel", mUiState);
    mContext->setContextProperty("musicModel", mMediaPlayer);
    mContext->setContextProperty("debug", this);
}

void NavigationController::add(const QString &path, NavigationItemModel *parentItem)
{
    auto dir = QDir(path);
    if(!dir.exists()) return;

    auto subDirsNames = dir.entryList(QDir::AllDirs);

    for(const auto& name : subDirsNames){
        if(name == "." || name == "..") continue;
        if(!checkContent(path + "/" + name)) continue;
        auto item = new NavigationItemModel(parentItem);
        if(!item->setPath(path + "/" + name)) {
            item->deleteLater();
            continue;
        }
        connect(item, &NavigationItemModel::clicked, this, &NavigationController::onNavigationRequest);
        parentItem->appendChild(item);
        add(item->getPath(), item);
    }
}

bool NavigationController::checkContent(const QString &path)
{
    bool valid = false;
    auto dir =QDir(path);
    // directory must either contain subdirectories or media files
    auto subDirsNames = dir.entryList(QDir::AllDirs);
    if(subDirsNames.length() > 0) {
        valid = true;
    } else {
        dir.setNameFilters(SettingsHandler::getAudioFileNameFilters());
        auto fileNames = dir.entryList(QDir::Files);
        int numAudio = 0;
        for(auto file:fileNames){
            numAudio++;
        }
        valid = numAudio > 0;
    }
    return valid;
}

void NavigationController::onNavigationRequest()
{
    auto item = qobject_cast<NavigationItemModel*>(QObject::sender());
    if(!item) return;

    if(item->hasChildren())
        mNavList->setModelItems(item->getChildren());
    else {
        mMediaPlayer->init(item);
        mUiState->showMusicPlayer();
    }
}

void NavigationController::startOrStopEnergySaverDependingOnPlayerState()
{
    auto* energySaver = EnergySaver::instance();
    assert(energySaver);
    if(energySaver){
        if(mMediaPlayer->isPlaying()){
            energySaver->deactivate();
        } else {
            energySaver->activate();
        }
    }
}