/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    This file copyright 2006 Chris Cannam and QMUL.
    
    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.  See the file
    COPYING included with this distribution for more information.
*/

#include "ViewManager.h"
#include "base/AudioPlaySource.h"
#include "base/RealTime.h"
#include "data/model/Model.h"
#include "widgets/CommandHistory.h"
#include "View.h"
#include "Overview.h"

#include <QSettings>
#include <QApplication>

#include <iostream>

//#define DEBUG_VIEW_MANAGER 1

ViewManager::ViewManager() :
    m_playSource(0),
    m_globalCentreFrame(0),
    m_globalZoom(1024),
    m_playbackFrame(0),
    m_playbackModel(0),
    m_mainModelSampleRate(0),
    m_lastLeft(0), 
    m_lastRight(0),
    m_inProgressExclusive(true),
    m_toolMode(NavigateMode),
    m_playLoopMode(false),
    m_playSelectionMode(false),
    m_playSoloMode(false),
    m_alignMode(false),
    m_overlayMode(StandardOverlays),
    m_zoomWheelsEnabled(true),
    m_illuminateLocalFeatures(true),
    m_showWorkTitle(false),
    m_lightPalette(QApplication::palette()),
    m_darkPalette(QApplication::palette())
{
    QSettings settings;
    settings.beginGroup("MainWindow");
    m_overlayMode = OverlayMode
        (settings.value("overlay-mode", int(m_overlayMode)).toInt());
    m_zoomWheelsEnabled =
        settings.value("zoom-wheels-enabled", m_zoomWheelsEnabled).toBool();
    settings.endGroup();

    if (getGlobalDarkBackground()) {
/*
        std::cerr << "dark palette:" << std::endl;
        std::cerr << "window = " << QApplication::palette().color(QPalette::Window).name().toStdString() << std::endl;
        std::cerr << "windowtext = " << QApplication::palette().color(QPalette::WindowText).name().toStdString() << std::endl;
        std::cerr << "base = " << QApplication::palette().color(QPalette::Base).name().toStdString() << std::endl;
        std::cerr << "alternatebase = " << QApplication::palette().color(QPalette::AlternateBase).name().toStdString() << std::endl;
        std::cerr << "text = " << QApplication::palette().color(QPalette::Text).name().toStdString() << std::endl;
        std::cerr << "button = " << QApplication::palette().color(QPalette::Button).name().toStdString() << std::endl;
        std::cerr << "buttontext = " << QApplication::palette().color(QPalette::ButtonText).name().toStdString() << std::endl;
        std::cerr << "brighttext = " << QApplication::palette().color(QPalette::BrightText).name().toStdString() << std::endl;
        std::cerr << "light = " << QApplication::palette().color(QPalette::Light).name().toStdString() << std::endl;
        std::cerr << "dark = " << QApplication::palette().color(QPalette::Dark).name().toStdString() << std::endl;
        std::cerr << "mid = " << QApplication::palette().color(QPalette::Mid).name().toStdString() << std::endl;
*/
        m_lightPalette = QPalette(QColor("#000000"),  // WindowText
                                  QColor("#dddfe4"),  // Button
                                  QColor("#ffffff"),  // Light
                                  QColor("#555555"),  // Dark
                                  QColor("#c7c7c7"),  // Mid
                                  QColor("#000000"),  // Text
                                  QColor("#ffffff"),  // BrightText
                                  QColor("#ffffff"),  // Base
                                  QColor("#efefef")); // Window
                                  

    } else {
/*
        std::cerr << "light palette:" << std::endl;
        std::cerr << "window = " << QApplication::palette().color(QPalette::Window).name().toStdString() << std::endl;
        std::cerr << "windowtext = " << QApplication::palette().color(QPalette::WindowText).name().toStdString() << std::endl;
        std::cerr << "base = " << QApplication::palette().color(QPalette::Base).name().toStdString() << std::endl;
        std::cerr << "alternatebase = " << QApplication::palette().color(QPalette::AlternateBase).name().toStdString() << std::endl;
        std::cerr << "text = " << QApplication::palette().color(QPalette::Text).name().toStdString() << std::endl;
        std::cerr << "button = " << QApplication::palette().color(QPalette::Button).name().toStdString() << std::endl;
        std::cerr << "buttontext = " << QApplication::palette().color(QPalette::ButtonText).name().toStdString() << std::endl;
        std::cerr << "brighttext = " << QApplication::palette().color(QPalette::BrightText).name().toStdString() << std::endl;
        std::cerr << "light = " << QApplication::palette().color(QPalette::Light).name().toStdString() << std::endl;
        std::cerr << "dark = " << QApplication::palette().color(QPalette::Dark).name().toStdString() << std::endl;
        std::cerr << "mid = " << QApplication::palette().color(QPalette::Mid).name().toStdString() << std::endl;
*/
        m_darkPalette = QPalette(QColor("#ffffff"),  // WindowText
                                 QColor("#3e3e3e"),  // Button
                                 QColor("#808080"),  // Light
                                 QColor("#1e1e1e"),  // Dark
                                 QColor("#404040"),  // Mid
                                 QColor("#ffffff"),  // Text
                                 QColor("#ffffff"),  // BrightText
                                 QColor("#000000"),  // Base
                                 QColor("#202020")); // Window
    }
}

ViewManager::~ViewManager()
{
}

unsigned long
ViewManager::getGlobalCentreFrame() const
{
#ifdef DEBUG_VIEW_MANAGER
    std::cout << "ViewManager::getGlobalCentreFrame: returning " << m_globalCentreFrame << std::endl;
#endif
    return m_globalCentreFrame;
}

void
ViewManager::setGlobalCentreFrame(unsigned long f)
{
#ifdef DEBUG_VIEW_MANAGER
    std::cout << "ViewManager::setGlobalCentreFrame to " << f << std::endl;
#endif
    m_globalCentreFrame = f;
    emit globalCentreFrameChanged(f);
}

unsigned long
ViewManager::getGlobalZoom() const
{
#ifdef DEBUG_VIEW_MANAGER
    std::cout << "ViewManager::getGlobalZoom: returning " << m_globalZoom << std::endl;
#endif
    return m_globalZoom;
}

unsigned long
ViewManager::getPlaybackFrame() const
{
    if (m_playSource && m_playSource->isPlaying()) {
	m_playbackFrame = m_playSource->getCurrentPlayingFrame();
    }
    return m_playbackFrame;
}

void
ViewManager::setPlaybackFrame(unsigned long f)
{
    if (m_playbackFrame != f) {
	m_playbackFrame = f;
	emit playbackFrameChanged(f);
	if (m_playSource && m_playSource->isPlaying()) {
	    m_playSource->play(f);
	}
    }
}

Model *
ViewManager::getPlaybackModel() const
{
    return m_playbackModel;
}

void
ViewManager::setPlaybackModel(Model *model)
{
    m_playbackModel = model;
}

size_t
ViewManager::alignPlaybackFrameToReference(size_t frame) const
{
    if (!m_playbackModel) return frame;
    else return m_playbackModel->alignToReference(frame);
}

size_t
ViewManager::alignReferenceToPlaybackFrame(size_t frame) const
{
    if (!m_playbackModel) return frame;
    else return m_playbackModel->alignFromReference(frame);
}

bool
ViewManager::haveInProgressSelection() const
{
    return !m_inProgressSelection.isEmpty();
}

const Selection &
ViewManager::getInProgressSelection(bool &exclusive) const
{
    exclusive = m_inProgressExclusive;
    return m_inProgressSelection;
}

void
ViewManager::setInProgressSelection(const Selection &selection, bool exclusive)
{
    m_inProgressExclusive = exclusive;
    m_inProgressSelection = selection;
    if (exclusive) clearSelections();
    emit inProgressSelectionChanged();
}

void
ViewManager::clearInProgressSelection()
{
    m_inProgressSelection = Selection();
    emit inProgressSelectionChanged();
}

const MultiSelection &
ViewManager::getSelection() const
{
    return m_selections;
}

const MultiSelection::SelectionList &
ViewManager::getSelections() const
{
    return m_selections.getSelections();
}

void
ViewManager::setSelection(const Selection &selection)
{
    MultiSelection ms(m_selections);
    ms.setSelection(selection);
    setSelections(ms);
}

void
ViewManager::addSelection(const Selection &selection)
{
    MultiSelection ms(m_selections);
    ms.addSelection(selection);
    setSelections(ms);
}

void
ViewManager::removeSelection(const Selection &selection)
{
    MultiSelection ms(m_selections);
    ms.removeSelection(selection);
    setSelections(ms);
}

void
ViewManager::clearSelections()
{
    MultiSelection ms(m_selections);
    ms.clearSelections();
    setSelections(ms);
}

void
ViewManager::setSelections(const MultiSelection &ms)
{
    if (m_selections.getSelections() == ms.getSelections()) return;
    SetSelectionCommand *command = new SetSelectionCommand(this, ms);
    CommandHistory::getInstance()->addCommand(command);
}

size_t
ViewManager::constrainFrameToSelection(size_t frame) const
{
    MultiSelection::SelectionList sl = getSelections();
    if (sl.empty()) return frame;

    for (MultiSelection::SelectionList::const_iterator i = sl.begin();
         i != sl.end(); ++i) {

        if (frame < i->getEndFrame()) {
            if (frame < i->getStartFrame()) {
                return i->getStartFrame();
            } else {
                return frame;
            }
        }
    }

    return sl.begin()->getStartFrame();
}

void
ViewManager::signalSelectionChange()
{
    emit selectionChanged();
}

ViewManager::SetSelectionCommand::SetSelectionCommand(ViewManager *vm,
						      const MultiSelection &ms) :
    m_vm(vm),
    m_oldSelection(vm->m_selections),
    m_newSelection(ms)
{
}

ViewManager::SetSelectionCommand::~SetSelectionCommand() { }

void
ViewManager::SetSelectionCommand::execute()
{
    m_vm->m_selections = m_newSelection;
    m_vm->signalSelectionChange();
}

void
ViewManager::SetSelectionCommand::unexecute()
{
    m_vm->m_selections = m_oldSelection;
    m_vm->signalSelectionChange();
}

QString
ViewManager::SetSelectionCommand::getName() const
{
    if (m_newSelection.getSelections().empty()) return tr("Clear Selection");
    if (m_newSelection.getSelections().size() > 1) return tr("Select Multiple Regions");
    else return tr("Select Region");
}

Selection
ViewManager::getContainingSelection(size_t frame, bool defaultToFollowing) const
{
    return m_selections.getContainingSelection(frame, defaultToFollowing);
}

void
ViewManager::setToolMode(ToolMode mode)
{
    m_toolMode = mode;

    emit toolModeChanged();

    switch (mode) {
    case NavigateMode: emit activity(tr("Enter Navigate mode")); break;
    case SelectMode: emit activity(tr("Enter Select mode")); break;
    case EditMode: emit activity(tr("Enter Edit mode")); break;
    case DrawMode: emit activity(tr("Enter Draw mode")); break;
    case EraseMode: emit activity(tr("Enter Erase mode")); break;
    case MeasureMode: emit activity(tr("Enter Measure mode")); break;
    };
}

void
ViewManager::setPlayLoopMode(bool mode)
{
    if (m_playLoopMode != mode) {

        m_playLoopMode = mode;

        emit playLoopModeChanged();
        emit playLoopModeChanged(mode);

        if (mode) emit activity(tr("Switch on Loop mode"));
        else emit activity(tr("Switch off Loop mode"));
    }
}

void
ViewManager::setPlaySelectionMode(bool mode)
{
    if (m_playSelectionMode != mode) {

        m_playSelectionMode = mode;

        emit playSelectionModeChanged();
        emit playSelectionModeChanged(mode);

        if (mode) emit activity(tr("Switch on Play Selection mode"));
        else emit activity(tr("Switch off Play Selection mode"));
    }
}

void
ViewManager::setPlaySoloMode(bool mode)
{
    if (m_playSoloMode != mode) {

        m_playSoloMode = mode;

        emit playSoloModeChanged();
        emit playSoloModeChanged(mode);

        if (mode) emit activity(tr("Switch on Play Solo mode"));
        else emit activity(tr("Switch off Play Solo mode"));
    }
}

void
ViewManager::setAlignMode(bool mode)
{
    if (m_alignMode != mode) {

        m_alignMode = mode;

        emit alignModeChanged();
        emit alignModeChanged(mode);

        if (mode) emit activity(tr("Switch on Alignment mode"));
        else emit activity(tr("Switch off Alignment mode"));
    }
}

size_t 
ViewManager::getPlaybackSampleRate() const
{
    if (m_playSource) {
        return m_playSource->getSourceSampleRate();
    }
    return 0;
}

size_t
ViewManager::getOutputSampleRate() const
{
    if (m_playSource) {
	return m_playSource->getTargetSampleRate();
    }
    return 0;
}

void
ViewManager::setAudioPlaySource(AudioPlaySource *source)
{
    if (!m_playSource) {
	QTimer::singleShot(100, this, SLOT(checkPlayStatus()));
    }
    m_playSource = source;
}

void
ViewManager::playStatusChanged(bool /* playing */)
{
    checkPlayStatus();
}

void
ViewManager::checkPlayStatus()
{
    if (m_playSource && m_playSource->isPlaying()) {

	float left = 0, right = 0;
	if (m_playSource->getOutputLevels(left, right)) {
	    if (left != m_lastLeft || right != m_lastRight) {
		emit outputLevelsChanged(left, right);
		m_lastLeft = left;
		m_lastRight = right;
	    }
	}

	m_playbackFrame = m_playSource->getCurrentPlayingFrame();

#ifdef DEBUG_VIEW_MANAGER
	std::cout << "ViewManager::checkPlayStatus: Playing, frame " << m_playbackFrame << ", levels " << m_lastLeft << "," << m_lastRight << std::endl;
#endif

	emit playbackFrameChanged(m_playbackFrame);

	QTimer::singleShot(20, this, SLOT(checkPlayStatus()));

    } else {

	QTimer::singleShot(100, this, SLOT(checkPlayStatus()));
	
	if (m_lastLeft != 0.0 || m_lastRight != 0.0) {
	    emit outputLevelsChanged(0.0, 0.0);
	    m_lastLeft = 0.0;
	    m_lastRight = 0.0;
	}

#ifdef DEBUG_VIEW_MANAGER
//	std::cout << "ViewManager::checkPlayStatus: Not playing" << std::endl;
#endif
    }
}

bool
ViewManager::isPlaying() const
{
    return m_playSource && m_playSource->isPlaying();
}

void
ViewManager::viewCentreFrameChanged(unsigned long f, bool locked,
                                    PlaybackFollowMode mode)
{
    View *v = dynamic_cast<View *>(sender());

#ifdef DEBUG_VIEW_MANAGER
    std::cerr << "ViewManager::viewCentreFrameChanged(" << f << ", " << locked << ", " << mode << "), view is " << v << std::endl;
#endif

    if (locked) {
        m_globalCentreFrame = f;
        emit globalCentreFrameChanged(f);
    } else {
        if (v) emit viewCentreFrameChanged(v, f);
    }

    if (!dynamic_cast<Overview *>(v) || (mode != PlaybackIgnore)) {
        if (m_mainModelSampleRate != 0) {
            emit activity(tr("Scroll to %1")
                          .arg(RealTime::frame2RealTime
                               (f, m_mainModelSampleRate).toText().c_str()));
        }
    }

    if (mode == PlaybackIgnore) {
        return;
    }

    seek(f);
}

void
ViewManager::seek(unsigned long f)
{
#ifdef DEBUG_VIEW_MANAGER 
    std::cout << "ViewManager::seek(" << f << ")" << std::endl;
#endif

    if (m_playSource && m_playSource->isPlaying()) {
	unsigned long playFrame = m_playSource->getCurrentPlayingFrame();
	unsigned long diff = std::max(f, playFrame) - std::min(f, playFrame);
	if (diff > 20000) {
	    m_playbackFrame = f;
	    m_playSource->play(f);
#ifdef DEBUG_VIEW_MANAGER 
	    std::cout << "ViewManager::considerSeek: reseeking from " << playFrame << " to " << f << std::endl;
#endif
            emit playbackFrameChanged(f);
	}
    } else {
        if (m_playbackFrame != f) {
            m_playbackFrame = f;
            emit playbackFrameChanged(f);
        }
    }
}

void
ViewManager::viewZoomLevelChanged(unsigned long z, bool locked)
{
    View *v = dynamic_cast<View *>(sender());

    if (!v) {
        std::cerr << "ViewManager::viewZoomLevelChanged: WARNING: sender is not a view" << std::endl;
        return;
    }

//!!!    emit zoomLevelChanged();
    
    if (locked) {
	m_globalZoom = z;
    }

#ifdef DEBUG_VIEW_MANAGER 
    std::cout << "ViewManager::viewZoomLevelChanged(" << v << ", " << z << ", " << locked << ")" << std::endl;
#endif

    emit viewZoomLevelChanged(v, z, locked);

    if (!dynamic_cast<Overview *>(v)) {
        emit activity(tr("Zoom to %n sample(s) per pixel", "", z));
    }
}

void
ViewManager::setOverlayMode(OverlayMode mode)
{
    if (m_overlayMode != mode) {
        m_overlayMode = mode;
        emit overlayModeChanged();
        emit activity(tr("Change overlay level"));
    }

    QSettings settings;
    settings.beginGroup("MainWindow");
    settings.setValue("overlay-mode", int(m_overlayMode));
    settings.endGroup();
}

void
ViewManager::setZoomWheelsEnabled(bool enabled)
{
    if (m_zoomWheelsEnabled != enabled) {
        m_zoomWheelsEnabled = enabled;
        emit zoomWheelsEnabledChanged();
        if (enabled) emit activity("Show zoom wheels");
        else emit activity("Hide zoom wheels");
    }

    QSettings settings;
    settings.beginGroup("MainWindow");
    settings.setValue("zoom-wheels-enabled", m_zoomWheelsEnabled);
    settings.endGroup();
}

void
ViewManager::setGlobalDarkBackground(bool dark)
{
    // also save the current palette, in case the user has changed it
    // since construction
    if (getGlobalDarkBackground()) {
        m_darkPalette = QApplication::palette();
    } else {
        m_lightPalette = QApplication::palette();
    }

    if (dark) {
        QApplication::setPalette(m_darkPalette);
    } else {
        QApplication::setPalette(m_lightPalette);
    }
}

bool
ViewManager::getGlobalDarkBackground() const
{
    bool dark = false;
    QColor windowBg = QApplication::palette().color(QPalette::Window);
    if (windowBg.red() + windowBg.green() + windowBg.blue() < 384) {
        dark = true;
    }
    return dark;
}