#include "maintoolbar.hpp"
#include "../util/settings.hpp"
#include "../model/tracklistmodel.hpp"

#include <QWidget>
#include <QHBoxLayout>
#include <QNetworkRequest>

MainToolBar::MainToolBar(QobuzBackend *backend, PlayQueue *queue, QWidget *parent)
    : QToolBar(parent)
    , m_backend(backend)
    , m_queue(queue)
{
    setMovable(false);
    setFloatable(false);
    setContextMenuPolicy(Qt::PreventContextMenu);
    setIconSize(QSize(22, 22));

    m_nam = new QNetworkAccessManager(this);
    connect(m_nam, &QNetworkAccessManager::finished, this, &MainToolBar::onAlbumArtReady);

    // --- Album art thumbnail ---
    m_artLabel = new QLabel(this);
    m_artLabel->setFixedSize(36, 36);
    m_artLabel->setScaledContents(true);
    m_artLabel->setStyleSheet("border: 1px solid #444; background: #1a1a1a;");
    m_artLabel->setPixmap(QIcon(":/res/icons/view-media-album-cover.svg")
                              .pixmap(32, 32));
    addWidget(m_artLabel);
    addSeparator();

    // --- Playback controls ---
    m_previous = addAction(Icon::previous(), tr("Previous"));
    connect(m_previous, &QAction::triggered, this, &MainToolBar::onPrevious);

    m_playPause = addAction(Icon::play(), tr("Play"));
    connect(m_playPause, &QAction::triggered, this, &MainToolBar::onPlayPause);

    m_next = addAction(Icon::next(), tr("Next"));
    connect(m_next, &QAction::triggered, this, &MainToolBar::onNext);

    addSeparator();

    // --- Track info label ---
    m_trackLabel = new QLabel(tr("Not playing"), this);
    m_trackLabel->setMinimumWidth(180);
    m_trackLabel->setMaximumWidth(340);
    m_trackLabel->setAlignment(Qt::AlignVCenter | Qt::AlignLeft);
    addWidget(m_trackLabel);

    addSeparator();

    // --- Progress slider ---
    m_progress = new ClickableSlider(Qt::Horizontal, this);
    m_progress->setRange(0, 1000);
    m_progress->setValue(0);
    m_progress->setMinimumWidth(160);
    m_progress->setMaximumWidth(380);
    addWidget(m_progress);

    connect(m_progress, &QSlider::sliderPressed,  this, [this] { m_seeking = true; });
    connect(m_progress, &QSlider::sliderReleased, this, &MainToolBar::onProgressReleased);

    m_timeLabel = new QLabel("0:00 / 0:00", this);
    addWidget(m_timeLabel);

    addSeparator();

    // --- Volume ---
    m_volume = new VolumeButton(this);
    m_volume->setValue(AppSettings::instance().volume());
    addWidget(m_volume);
    connect(m_volume, &VolumeButton::volumeChanged, this, &MainToolBar::onVolumeChanged);

    addSeparator();

    // --- Shuffle ---
    m_shuffle = addAction(Icon::get(QStringLiteral("media-playlist-shuffle")), tr("Shuffle"));
    m_shuffle->setCheckable(true);
    connect(m_shuffle, &QAction::toggled, this, &MainToolBar::onShuffleToggled);

    addSeparator();

    // --- Queue toggle ---
    m_queueBtn = addAction(Icon::queue(), tr("Queue"));
    m_queueBtn->setCheckable(true);
    connect(m_queueBtn, &QAction::toggled, this, &MainToolBar::queueToggled);

    // --- Search toggle ---
    m_search = addAction(Icon::search(), tr("Search"));
    m_search->setCheckable(true);
    connect(m_search, &QAction::toggled, this, &MainToolBar::searchToggled);

    // --- Backend signals ---
    connect(m_backend, &QobuzBackend::stateChanged,    this, &MainToolBar::onBackendStateChanged);
    connect(m_backend, &QobuzBackend::trackChanged,    this, &MainToolBar::onTrackChanged);
    connect(m_backend, &QobuzBackend::positionChanged, this, &MainToolBar::onPositionChanged);
    connect(m_backend, &QobuzBackend::trackFinished,   this, &MainToolBar::onTrackFinished);

    // --- Queue signals ---
    connect(m_queue, &PlayQueue::queueChanged, this, &MainToolBar::onQueueChanged);
    onQueueChanged(); // initialise button states
}

// ---- public ----

void MainToolBar::setPlaying(bool playing)
{
    m_playing = playing;
    m_playPause->setIcon(playing ? Icon::pause() : Icon::play());
    m_playPause->setText(playing ? tr("Pause") : tr("Play"));
}

void MainToolBar::setCurrentTrack(const QJsonObject &track)
{
    const QString title    = track["title"].toString();
    const QString artist   = track["performer"].toObject()["name"].toString().isEmpty()
        ? track["album"].toObject()["artist"].toObject()["name"].toString()
        : track["performer"].toObject()["name"].toString();

    if (title.isEmpty()) {
        m_trackLabel->setText(tr("Not playing"));
    } else if (artist.isEmpty()) {
        m_trackLabel->setText(title);
    } else {
        m_trackLabel->setText(QStringLiteral("%1 — %2").arg(artist, title));
    }

    // Album art
    const QString artUrl = track["album"].toObject()["image"].toObject()["small"].toString();
    if (!artUrl.isEmpty() && artUrl != m_currentArtUrl) {
        m_currentArtUrl = artUrl;
        fetchAlbumArt(artUrl);
    }
}

void MainToolBar::updateProgress(quint64 position, quint64 duration)
{
    if (m_seeking) return;
    const int sliderPos = duration > 0
        ? static_cast<int>(position * 1000 / duration) : 0;
    m_progress->blockSignals(true);
    m_progress->setValue(sliderPos);
    m_progress->blockSignals(false);
    m_timeLabel->setText(
        QStringLiteral("%1 / %2")
            .arg(TrackListModel::formatDuration(static_cast<qint64>(position)),
                 TrackListModel::formatDuration(static_cast<qint64>(duration))));
}

// ---- private slots ----

void MainToolBar::onPlayPause()
{
    if (m_playing) m_backend->pause();
    else           m_backend->resume();
}

void MainToolBar::onPrevious()
{
    if (!m_queue->canGoPrev()) return;
    const QJsonObject track = m_queue->stepBack();
    const qint64 id = static_cast<qint64>(track["id"].toDouble());
    if (id > 0)
        m_backend->playTrack(id, AppSettings::instance().preferredFormat());
}

void MainToolBar::onNext()
{
    if (!m_queue->canGoNext()) return;
    const QJsonObject track = m_queue->advance();
    const qint64 id = static_cast<qint64>(track["id"].toDouble());
    if (id > 0)
        m_backend->playTrack(id, AppSettings::instance().preferredFormat());
}

void MainToolBar::onProgressReleased()
{
    m_seeking = false;
}

void MainToolBar::onVolumeChanged(int volume)
{
    m_backend->setVolume(volume);
    AppSettings::instance().setVolume(volume);
}

void MainToolBar::onBackendStateChanged(const QString &state)
{
    setPlaying(state == QStringLiteral("playing"));
}

void MainToolBar::onTrackChanged(const QJsonObject &track)
{
    setCurrentTrack(track);
}

void MainToolBar::onPositionChanged(quint64 position, quint64 duration)
{
    updateProgress(position, duration);
}

void MainToolBar::onTrackFinished()
{
    // Auto-advance queue
    if (m_queue->canGoNext()) {
        onNext();
    } else {
        setPlaying(false);
        m_progress->setValue(0);
        m_timeLabel->setText("0:00 / 0:00");
    }
}

void MainToolBar::onQueueChanged()
{
    m_previous->setEnabled(m_queue->canGoPrev());
    m_next->setEnabled(m_queue->canGoNext());
}

void MainToolBar::onShuffleToggled(bool checked)
{
    m_queue->setShuffle(checked);
}

void MainToolBar::fetchAlbumArt(const QString &url)
{
    m_nam->get(QNetworkRequest(QUrl(url)));
}

void MainToolBar::onAlbumArtReady(QNetworkReply *reply)
{
    reply->deleteLater();
    if (reply->error() != QNetworkReply::NoError) return;
    QPixmap pix;
    if (pix.loadFromData(reply->readAll()))
        m_artLabel->setPixmap(pix);
}