/***************************************************************************
 *   Copyright (C) 2011 by Simon Andreas Eugster (simon.eu@gmail.com)      *
 *   This file is part of kdenlive. See www.kdenlive.org.                  *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 ***************************************************************************/

#include "scopemanager.h"
#include "audioscopes/audiosignal.h"
#include "audioscopes/audiospectrum.h"
#include "audioscopes/spectrogram.h"
#include "colorscopes/histogram.h"
#include "colorscopes/rgbparade.h"
#include "colorscopes/vectorscope.h"
#include "colorscopes/waveform.h"
#include "core.h"
#include "definitions.h"
#include "kdenlivesettings.h"
#include "mainwindow.h"
#include "monitor/monitormanager.h"

#include "klocalizedstring.h"
#include <QDockWidget>
#include <QSignalMapper>

//#define DEBUG_SM
#ifdef DEBUG_SM
#include <QDebug>
#endif

ScopeManager::ScopeManager(QObject *parent)
    : QObject(parent)

{
    connect(pCore->monitorManager(), &MonitorManager::checkColorScopes, this, &ScopeManager::slotUpdateActiveRenderer);
    connect(pCore->monitorManager(), &MonitorManager::clearScopes, this, &ScopeManager::slotClearColorScopes);
    connect(pCore->monitorManager(), &MonitorManager::checkScopes, this, &ScopeManager::slotCheckActiveScopes);

    slotUpdateActiveRenderer();

    createScopes();
}

bool ScopeManager::addScope(AbstractAudioScopeWidget *audioScope, QDockWidget *audioScopeWidget)
{
    bool added = false;
    int exists = 0;
    // Only add the scope if it does not exist yet in the list
    for (auto &m_audioScope : m_audioScopes) {
        if (m_audioScope.scope == audioScope) {
            exists = 1;
            break;
        }
    }
    if (exists == 0) {
// Add scope to the list, set up signal/slot connections
#ifdef DEBUG_SM
        qCDebug(KDENLIVE_LOG) << "Adding scope to scope manager: " << audioScope->widgetName();
#endif

        AudioScopeData asd;
        asd.scope = audioScope;
        m_audioScopes.append(asd);

        connect(audioScope, &AbstractScopeWidget::requestAutoRefresh, this, &ScopeManager::slotCheckActiveScopes);
        if (audioScopeWidget != nullptr) {
            connect(audioScopeWidget, &QDockWidget::visibilityChanged, this, &ScopeManager::slotCheckActiveScopes);
            connect(audioScopeWidget, &QDockWidget::visibilityChanged, this, [this, audioScope](){slotRequestFrame(QString(audioScope->widgetName()));});
        }

        added = true;
    }
    return added;
}
bool ScopeManager::addScope(AbstractGfxScopeWidget *colorScope, QDockWidget *colorScopeWidget)
{
    bool added = false;
    int exists = 0;
    for (auto &m_colorScope : m_colorScopes) {
        if (m_colorScope.scope == colorScope) {
            exists = 1;
            break;
        }
    }
    if (exists == 0) {
#ifdef DEBUG_SM
        qCDebug(KDENLIVE_LOG) << "Adding scope to scope manager: " << colorScope->widgetName();
#endif

        GfxScopeData gsd;
        gsd.scope = colorScope;
        m_colorScopes.append(gsd);

        connect(colorScope, &AbstractScopeWidget::requestAutoRefresh, this, &ScopeManager::slotCheckActiveScopes);
        connect(colorScope, &AbstractGfxScopeWidget::signalFrameRequest, this, &ScopeManager::slotRequestFrame);
        connect(colorScope, &AbstractScopeWidget::signalScopeRenderingFinished, this, &ScopeManager::slotScopeReady);
        if (colorScopeWidget != nullptr) {
            connect(colorScopeWidget, &QDockWidget::visibilityChanged, this, &ScopeManager::slotCheckActiveScopes);
            connect(colorScopeWidget, &QDockWidget::visibilityChanged, this, [this, colorScope](){slotRequestFrame(QString(colorScope->widgetName()));});
        }

        added = true;
    }
    return added;
}

void ScopeManager::slotDistributeAudio(const audioShortVector &sampleData, int freq, int num_channels, int num_samples)
{
#ifdef DEBUG_SM
    qCDebug(KDENLIVE_LOG) << "ScopeManager: Starting to distribute audio.";
#endif
    for (auto &m_audioScope : m_audioScopes) {
        // Distribute audio to all scopes that are visible and want to be refreshed
        if (!m_audioScope.scope->visibleRegion().isEmpty()) {
            if (m_audioScope.scope->autoRefreshEnabled()) {
                m_audioScope.scope->slotReceiveAudio(sampleData, freq, num_channels, num_samples);
#ifdef DEBUG_SM
                qCDebug(KDENLIVE_LOG) << "ScopeManager: Distributed audio to " << m_audioScopes[i].scope->widgetName();
#endif
            }
        }
    }
}
void ScopeManager::slotDistributeFrame(const QImage &image)
{
#ifdef DEBUG_SM
    qCDebug(KDENLIVE_LOG) << "ScopeManager: Starting to distribute frame.";
#endif
    for (auto &m_colorScope : m_colorScopes) {
        if (!m_colorScope.scope->visibleRegion().isEmpty()) {
            if (m_colorScope.scope->autoRefreshEnabled()) {
                m_colorScope.scope->slotRenderZoneUpdated(image);
#ifdef DEBUG_SM
                qCDebug(KDENLIVE_LOG) << "ScopeManager: Distributed frame to " << m_colorScopes[i].scope->widgetName();
#endif
            } else if (m_colorScope.singleFrameRequested) {
                // Special case: Auto refresh is disabled, but user requested an update (e.g. by clicking).
                // Force the scope to update.
                m_colorScope.singleFrameRequested = false;
                m_colorScope.scope->slotRenderZoneUpdated(image);
                m_colorScope.scope->forceUpdateScope();
#ifdef DEBUG_SM
                qCDebug(KDENLIVE_LOG) << "ScopeManager: Distributed forced frame to " << m_colorScopes[i].scope->widgetName();
#endif
            }
        }
    }
    // checkActiveColourScopes();
}

void ScopeManager::slotScopeReady()
{
    if (m_lastConnectedRenderer) {
        m_lastConnectedRenderer->scopesClear();
    }
}

void ScopeManager::slotRequestFrame(const QString &widgetName)
{
#ifdef DEBUG_SM
    qCDebug(KDENLIVE_LOG) << "ScopeManager: New frame was requested by " << widgetName;
#endif

    // Search for the scope in the lists and tag it to trigger a forced update
    // in the distribution slots
    for (auto &m_colorScope : m_colorScopes) {
        if (m_colorScope.scope->widgetName() == widgetName) {
            m_colorScope.singleFrameRequested = true;
            break;
        }
    }
    for (auto &m_audioScope : m_audioScopes) {
        if (m_audioScope.scope->widgetName() == widgetName) {
            m_audioScope.singleFrameRequested = true;
            break;
        }
    }
    if (m_lastConnectedRenderer) {
        // TODO: trigger refresh?
        m_lastConnectedRenderer->refreshMonitorIfActive();
        // m_lastConnectedRenderer->sendFrameUpdate();
    }
}

void ScopeManager::slotClearColorScopes()
{
    m_lastConnectedRenderer = nullptr;
}

void ScopeManager::slotUpdateActiveRenderer()
{
    // Disconnect old connections
    if (m_lastConnectedRenderer != nullptr) {
#ifdef DEBUG_SM
        qCDebug(KDENLIVE_LOG) << "Disconnected previous renderer: " << m_lastConnectedRenderer->id();
#endif
        m_lastConnectedRenderer->disconnect(this);
    }

    m_lastConnectedRenderer = pCore->monitorManager()->activeMonitor();
    // DVD monitor shouldn't be monitored or will cause crash on deletion
    if (pCore->monitorManager()->isActive(Kdenlive::DvdMonitor)) {
        m_lastConnectedRenderer = nullptr;
    }

    // Connect new renderer
    if (m_lastConnectedRenderer != nullptr) {
        connect(m_lastConnectedRenderer, &Monitor::frameUpdated, this, &ScopeManager::slotDistributeFrame, Qt::UniqueConnection);
        connect(m_lastConnectedRenderer, &Monitor::audioSamplesSignal, this, &ScopeManager::slotDistributeAudio, Qt::UniqueConnection);

#ifdef DEBUG_SM
        qCDebug(KDENLIVE_LOG) << "Renderer connected to ScopeManager: " << m_lastConnectedRenderer->id();
#endif

        if (imagesAcceptedByScopes()) {
#ifdef DEBUG_SM
            qCDebug(KDENLIVE_LOG) << "Some scopes accept images, triggering frame update.";
#endif
            m_lastConnectedRenderer->refreshMonitorIfActive();
        }
    }
}

void ScopeManager::slotCheckActiveScopes()
{
#ifdef DEBUG_SM
    qCDebug(KDENLIVE_LOG) << "Checking active scopes ...";
#endif
    // Leave a small delay to make sure that scope widget has been shown or hidden
    QTimer::singleShot(500, this, &ScopeManager::checkActiveAudioScopes);
    QTimer::singleShot(500, this, &ScopeManager::checkActiveColourScopes);
}

bool ScopeManager::audioAcceptedByScopes() const
{
    bool accepted = false;
    for (auto m_audioScope : m_audioScopes) {
        if (m_audioScope.scope->isVisible() && m_audioScope.scope->autoRefreshEnabled()) {
            accepted = true;
            break;
        }
    }
#ifdef DEBUG_SM
    qCDebug(KDENLIVE_LOG) << "Any scope accepting audio? " << accepted;
#endif
    return accepted;
}
bool ScopeManager::imagesAcceptedByScopes() const
{
    bool accepted = false;
    for (auto m_colorScope : m_colorScopes) {
        if (!m_colorScope.scope->visibleRegion().isEmpty() && m_colorScope.scope->autoRefreshEnabled()) {
            accepted = true;
            break;
        }
    }
#ifdef DEBUG_SM
    qCDebug(KDENLIVE_LOG) << "Any scope accepting images? " << accepted;
#endif
    return accepted;
}

void ScopeManager::checkActiveAudioScopes()
{
    bool audioStillRequested = audioAcceptedByScopes();

#ifdef DEBUG_SM
    qCDebug(KDENLIVE_LOG) << "ScopeManager: New audio data still requested? " << audioStillRequested;
#endif

    KdenliveSettings::setMonitor_audio(audioStillRequested);
    pCore->monitorManager()->slotUpdateAudioMonitoring();
}

void ScopeManager::checkActiveColourScopes()
{
    bool imageStillRequested = imagesAcceptedByScopes();

#ifdef DEBUG_SM
    qCDebug(KDENLIVE_LOG) << "ScopeManager: New frames still requested? " << imageStillRequested;
#endif

    // Notify monitors whether frames are still required
    Monitor *monitor;
    monitor = static_cast<Monitor *>(pCore->monitorManager()->monitor(Kdenlive::ProjectMonitor));
    if (monitor != nullptr) {
        monitor->sendFrameForAnalysis(imageStillRequested);
    }

    monitor = static_cast<Monitor *>(pCore->monitorManager()->monitor(Kdenlive::ClipMonitor));
    if (monitor != nullptr) {
        monitor->sendFrameForAnalysis(imageStillRequested);
    }
}

void ScopeManager::createScopes()
{
    createScopeDock(new Vectorscope(pCore->window()), i18n("Vectorscope"), QStringLiteral("vectorscope"));
    createScopeDock(new Waveform(pCore->window()), i18n("Waveform"), QStringLiteral("waveform"));
    createScopeDock(new RGBParade(pCore->window()), i18n("RGB Parade"), QStringLiteral("rgb_parade"));
    createScopeDock(new Histogram(pCore->window()), i18n("Histogram"), QStringLiteral("histogram"));
    // Deprecated scopes
    // createScopeDock(new Spectrogram(pCore->window()),   i18n("Spectrogram"));
    // createScopeDock(new AudioSignal(pCore->window()),   i18n("Audio Signal"));
    // createScopeDock(new AudioSpectrum(pCore->window()), i18n("AudioSpectrum"));
}

template <class T> void ScopeManager::createScopeDock(T *scopeWidget, const QString &title, const QString &name)
{
    QDockWidget *dock = pCore->window()->addDock(title, name, scopeWidget);
    addScope(scopeWidget, dock);

    // close for initial layout
    // actual state will be restored by session management
    dock->close();
}
