#include "nmWxPebiResultControlBar.h"

#include "nmPebiResultPlaybackController.h"
#include "nmPebiResultPropertyDisplayText.h"
#include "nmPebiResultSceneController.h"
#include "nmWxPebiResultAnimationSettingsDlg.h"
#include "nmWxPebiResultColorScaleSettingsDlg.h"

#include <QComboBox>
#include <QCoreApplication>
#include <QHBoxLayout>
#include <QIcon>
#include <QSize>
#include <QSizePolicy>
#include <QToolButton>
#include <QVariant>

namespace {

QString resultControlIconPath(const QString& sFileName)
{
    const QString sApplicationDir = QCoreApplication::applicationDirPath();
    return sApplicationDir.section('/', 0, -2) +
            "/Res/Icon/" + sFileName;
}

QToolButton* createControlButton(QWidget* pParent,
                                 const QString& sIconFile,
                                 const QString& sToolTip)
{
    QToolButton* pButton = new QToolButton(pParent);
    pButton->setAutoRaise(true);
    pButton->setFixedSize(24, 24);
    pButton->setIconSize(QSize(16, 16));
    pButton->setIcon(QIcon(resultControlIconPath(sIconFile)));
    pButton->setToolTip(sToolTip);
    return pButton;
}

}

nmWxPebiResultControlBar::nmWxPebiResultControlBar(
        nmPebiResultSceneController* pSceneController,
        QWidget* pParent)
    : QWidget(pParent),
      m_pPlaybackController(nullptr),
      m_pSceneController(pSceneController),
      m_pPropertyCombo(nullptr),
      m_pColorSettingsButton(nullptr),
      m_pFirstButton(nullptr),
      m_pPreviousButton(nullptr),
      m_pTimeCombo(nullptr),
      m_pNextButton(nullptr),
      m_pLastButton(nullptr),
      m_pPlayPauseButton(nullptr),
      m_pSettingsButton(nullptr),
      m_nDisplayedBindingRevision(0),
      m_nDisplayedTimeFrameCount(-1)
{
    Q_ASSERT(pSceneController != nullptr);
    createUi();
    m_pPlaybackController = new nmPebiResultPlaybackController(
                pSceneController, this);
    connect(m_pPlaybackController, SIGNAL(stateChanged()),
            this, SLOT(refreshFromController()));
    connect(m_pPlaybackController, SIGNAL(operationFailed(QString)),
            this, SLOT(forwardOperationFailure(QString)));
    m_pPlaybackController->synchronizeFromScene();
}

nmWxPebiResultControlBar::~nmWxPebiResultControlBar()
{
    // QObject 随后删除子控制器；先停表可保证析构期间不再排入超时请求。
    if(m_pPlaybackController != nullptr) {
        m_pPlaybackController->blockSignals(true);
        m_pPlaybackController->pause();
    }
}

void nmWxPebiResultControlBar::stopPlayback()
{
    if(m_pPlaybackController != nullptr) {
        m_pPlaybackController->pause();
    }
}

void nmWxPebiResultControlBar::synchronizeFromScene()
{
    if(m_pPlaybackController != nullptr) {
        m_pPlaybackController->synchronizeFromScene();
    }
}

nmPebiResultPlaybackController*
nmWxPebiResultControlBar::getPlaybackController() const
{
    return m_pPlaybackController;
}

void nmWxPebiResultControlBar::onPropertyIndexChanged(int nIndex)
{
    if(m_pPlaybackController == nullptr || nIndex < 0) {
        return;
    }
    if(m_pPlaybackController->selectProperty(
           m_pPropertyCombo->itemData(nIndex).toString())) {
        emit operationSucceeded();
    }
}

void nmWxPebiResultControlBar::onTimeIndexChanged(int nIndex)
{
    if(m_pPlaybackController == nullptr || nIndex < 0) {
        return;
    }
    if(m_pPlaybackController->selectFrame(
           m_pTimeCombo->itemData(nIndex).toInt())) {
        emit operationSucceeded();
    }
}

void nmWxPebiResultControlBar::onColorSettingsClicked()
{
    if(m_pPlaybackController == nullptr || m_pSceneController == nullptr ||
       !m_pSceneController->hasSnapshot()) {
        return;
    }

    // 打开任何结果设置都属于手动操作；关闭后不自动恢复播放。
    m_pPlaybackController->pause();
    nmWxPebiResultColorScaleSettingsDlg oDialog(
                m_pSceneController, this);
    connect(&oDialog, SIGNAL(displaySettingsApplied()),
            this, SIGNAL(operationSucceeded()));
    connect(&oDialog, SIGNAL(operationFailed(QString)),
            this, SLOT(forwardOperationFailure(QString)));
    oDialog.exec();
}

void nmWxPebiResultControlBar::onFirstFrameClicked()
{
    if(m_pPlaybackController->selectFirstFrame()) {
        emit operationSucceeded();
    }
}

void nmWxPebiResultControlBar::onPreviousFrameClicked()
{
    if(m_pPlaybackController->selectPreviousFrame()) {
        emit operationSucceeded();
    }
}

void nmWxPebiResultControlBar::onNextFrameClicked()
{
    if(m_pPlaybackController->selectNextFrame()) {
        emit operationSucceeded();
    }
}

void nmWxPebiResultControlBar::onLastFrameClicked()
{
    if(m_pPlaybackController->selectLastFrame()) {
        emit operationSucceeded();
    }
}

void nmWxPebiResultControlBar::onPlayPauseClicked()
{
    if(m_pPlaybackController->togglePlayback()) {
        emit operationSucceeded();
    }
}

void nmWxPebiResultControlBar::onAnimationSettingsClicked()
{
    // 打开设置属于明确的手动操作；关闭对话框后不自动恢复播放。
    m_pPlaybackController->pause();
    nmWxPebiResultAnimationSettingsDlg oDialog(
                m_pPlaybackController->getPlaybackSpeed(),
                m_pPlaybackController->isLoopEnabled(), this);
    if(oDialog.exec() == QDialog::Accepted) {
        if(m_pPlaybackController->setPlaybackSettings(
               oDialog.getPlaybackSpeed(),
               oDialog.isLoopEnabled())) {
            emit operationSucceeded();
        }
    }
}

void nmWxPebiResultControlBar::refreshFromController()
{
    // 控件状态严格镜像四类 Scene 状态：无快照、静态、单帧动态、多帧动态。
    const bool bAvailable = m_pPlaybackController != nullptr &&
            m_pPlaybackController->isAvailable();
    if(!bAvailable) {
        const bool bPropertyBlocked = m_pPropertyCombo->blockSignals(true);
        m_pPropertyCombo->clear();
        m_pPropertyCombo->blockSignals(bPropertyBlocked);
        clearTimeItems();
        m_sDisplayedSnapshotId.clear();
        m_nDisplayedBindingRevision = 0;
        m_listDisplayedPropertyIds.clear();
        m_pPropertyCombo->setEnabled(false);
        m_pColorSettingsButton->setEnabled(false);
        m_pFirstButton->setEnabled(false);
        m_pPreviousButton->setEnabled(false);
        m_pNextButton->setEnabled(false);
        m_pLastButton->setEnabled(false);
        m_pPlayPauseButton->setEnabled(false);
        m_pSettingsButton->setEnabled(false);
        m_pPlayPauseButton->setIcon(QIcon(resultControlIconPath(
                    QString::fromLatin1("NmStartAnimation.png"))));
        m_pPlayPauseButton->setToolTip(tr("Play"));
        return;
    }

    const QString sSnapshotId =
            m_pPlaybackController->getObservedSnapshotId();
    const quint64 nBindingRevision =
            m_pPlaybackController->getObservedBindingRevision();
    const QStringList listPropertyIds =
            m_pPlaybackController->getAvailablePropertyIds();
    const bool bSnapshotChanged =
            m_nDisplayedBindingRevision != nBindingRevision ||
            m_sDisplayedSnapshotId != sSnapshotId;
    if(bSnapshotChanged ||
       m_listDisplayedPropertyIds != listPropertyIds) {
        rebuildPropertyItems(listPropertyIds);
        m_sDisplayedSnapshotId = sSnapshotId;
        m_nDisplayedBindingRevision = nBindingRevision;
        m_listDisplayedPropertyIds = listPropertyIds;

        // 即使属性和帧数相同，新快照的真实时间值也可能不同，不能复用旧列表。
        if(bSnapshotChanged) {
            m_sDisplayedTimePropertyId.clear();
            m_nDisplayedTimeFrameCount = -1;
        }
    }

    const QString sPropertyId =
            m_pPlaybackController->getCurrentPropertyId();
    const int nPropertyIndex = findItemByData(
                m_pPropertyCombo, QVariant(sPropertyId));
    const bool bPropertyBlocked = m_pPropertyCombo->blockSignals(true);
    m_pPropertyCombo->setCurrentIndex(nPropertyIndex);
    m_pPropertyCombo->blockSignals(bPropertyBlocked);
    m_pPropertyCombo->setEnabled(true);
    m_pColorSettingsButton->setEnabled(true);

    const bool bTimeDependent =
            m_pPlaybackController->isPropertyTimeDependent(sPropertyId);
    const int nFrameCount = bTimeDependent
            ? m_pPlaybackController->getPropertyFrameCount(sPropertyId) : 0;
    if(!bTimeDependent) {
        clearTimeItems();
    } else if(m_sDisplayedTimePropertyId != sPropertyId ||
              m_nDisplayedTimeFrameCount != nFrameCount) {
        rebuildTimeItems(sPropertyId, nFrameCount);
    }

    const int nCurrentFrame =
            m_pPlaybackController->getCurrentFrameIndex();
    if(bTimeDependent) {
        const int nTimeIndex = findItemByData(
                    m_pTimeCombo, QVariant(nCurrentFrame));
        const bool bTimeBlocked = m_pTimeCombo->blockSignals(true);
        m_pTimeCombo->setCurrentIndex(nTimeIndex);
        m_pTimeCombo->blockSignals(bTimeBlocked);
    }

    const bool bHasCompleteTimeList = bTimeDependent &&
            nFrameCount > 0 && m_pTimeCombo->count() == nFrameCount;
    const bool bHasTime = bHasCompleteTimeList;
    const bool bHasMultipleFrames = bHasCompleteTimeList &&
            nFrameCount > 1;
    m_pTimeCombo->setEnabled(bHasTime);
    m_pFirstButton->setEnabled(
                bHasMultipleFrames && nCurrentFrame > 0);
    m_pPreviousButton->setEnabled(
                bHasMultipleFrames && nCurrentFrame > 0);
    m_pNextButton->setEnabled(
                bHasMultipleFrames && nCurrentFrame < nFrameCount - 1);
    m_pLastButton->setEnabled(
                bHasMultipleFrames && nCurrentFrame < nFrameCount - 1);
    m_pPlayPauseButton->setEnabled(bHasMultipleFrames);
    m_pSettingsButton->setEnabled(bHasMultipleFrames);

    const bool bPlaying = m_pPlaybackController->isPlaying();
    m_pPlayPauseButton->setIcon(QIcon(resultControlIconPath(
                bPlaying ? QString::fromLatin1("NmStopAnimation.png")
                         : QString::fromLatin1("NmStartAnimation.png"))));
    m_pPlayPauseButton->setToolTip(
                bPlaying ? tr("Pause") : tr("Play"));
}

void nmWxPebiResultControlBar::forwardOperationFailure(
        const QString& sError)
{
    emit operationFailed(sError);
}

void nmWxPebiResultControlBar::createUi()
{
    QHBoxLayout* pLayout = new QHBoxLayout(this);
    pLayout->setContentsMargins(4, 3, 4, 3);
    pLayout->setSpacing(4);

    m_pPropertyCombo = new QComboBox(this);
    m_pPropertyCombo->setMinimumWidth(140);
    m_pPropertyCombo->setFixedHeight(24);
    m_pPropertyCombo->setSizePolicy(
                QSizePolicy::Preferred, QSizePolicy::Fixed);
    m_pPropertyCombo->setToolTip(tr("Display property"));

    m_pColorSettingsButton = createControlButton(
                this, QString::fromLatin1("NmColorScaleSettings.png"),
                tr("Color settings"));

    m_pFirstButton = createControlButton(
                this, QString::fromLatin1("NmFirstStep.png"),
                tr("First frame"));
    m_pPreviousButton = createControlButton(
                this, QString::fromLatin1("NmPreviousStep.png"),
                tr("Previous frame"));
    m_pTimeCombo = new QComboBox(this);
    m_pTimeCombo->setMinimumWidth(150);
    m_pTimeCombo->setFixedHeight(24);
    m_pTimeCombo->setSizePolicy(
                QSizePolicy::Expanding, QSizePolicy::Fixed);
    m_pTimeCombo->setToolTip(tr("Result time"));
    m_pNextButton = createControlButton(
                this, QString::fromLatin1("NmNextStep.png"),
                tr("Next frame"));
    m_pLastButton = createControlButton(
                this, QString::fromLatin1("NmLastStep.png"),
                tr("Last frame"));
    m_pPlayPauseButton = createControlButton(
                this, QString::fromLatin1("NmStartAnimation.png"),
                tr("Play"));
    m_pSettingsButton = createControlButton(
                this, QString::fromLatin1("NmAnimationSettings.png"),
                tr("Animation settings"));

    pLayout->addWidget(m_pPropertyCombo);
    pLayout->addWidget(m_pColorSettingsButton);
    pLayout->addWidget(m_pFirstButton);
    pLayout->addWidget(m_pPreviousButton);
    pLayout->addWidget(m_pTimeCombo, 1);
    pLayout->addWidget(m_pNextButton);
    pLayout->addWidget(m_pLastButton);
    pLayout->addWidget(m_pPlayPauseButton);
    pLayout->addWidget(m_pSettingsButton);

    connect(m_pPropertyCombo, SIGNAL(currentIndexChanged(int)),
            this, SLOT(onPropertyIndexChanged(int)));
    connect(m_pColorSettingsButton, SIGNAL(clicked()),
            this, SLOT(onColorSettingsClicked()));
    connect(m_pTimeCombo, SIGNAL(currentIndexChanged(int)),
            this, SLOT(onTimeIndexChanged(int)));
    connect(m_pFirstButton, SIGNAL(clicked()),
            this, SLOT(onFirstFrameClicked()));
    connect(m_pPreviousButton, SIGNAL(clicked()),
            this, SLOT(onPreviousFrameClicked()));
    connect(m_pNextButton, SIGNAL(clicked()),
            this, SLOT(onNextFrameClicked()));
    connect(m_pLastButton, SIGNAL(clicked()),
            this, SLOT(onLastFrameClicked()));
    connect(m_pPlayPauseButton, SIGNAL(clicked()),
            this, SLOT(onPlayPauseClicked()));
    connect(m_pSettingsButton, SIGNAL(clicked()),
            this, SLOT(onAnimationSettingsClicked()));
}

void nmWxPebiResultControlBar::rebuildPropertyItems(
        const QStringList& listPropertyIds)
{
    const bool bBlocked = m_pPropertyCombo->blockSignals(true);
    m_pPropertyCombo->clear();
    for(int nIndex = 0; nIndex < listPropertyIds.size(); ++nIndex) {
        const QString& sPropertyId = listPropertyIds[nIndex];
        QString sDisplayName =
                nmPebiResultPropertyDisplayText::getDisplayName(sPropertyId);
        if(sDisplayName.isEmpty()) {
            sDisplayName = sPropertyId;
        }
        m_pPropertyCombo->addItem(sDisplayName, sPropertyId);
    }
    m_pPropertyCombo->blockSignals(bBlocked);
}

void nmWxPebiResultControlBar::rebuildTimeItems(
        const QString& sPropertyId,
        int nFrameCount)
{
    const bool bBlocked = m_pTimeCombo->blockSignals(true);
    m_pTimeCombo->clear();
    bool bComplete = true;
    for(int nFrameIndex = 0; nFrameIndex < nFrameCount; ++nFrameIndex) {
        double dTimeHours = 0.0;
        if(!m_pPlaybackController->getPropertyTimeAt(
               sPropertyId, nFrameIndex, dTimeHours)) {
            // 时间轴来自完整快照；防御性失败时不留下索引错位的半列表。
            m_pTimeCombo->clear();
            bComplete = false;
            break;
        }
        m_pTimeCombo->addItem(
                    tr("t = %1 h").arg(
                        QString::number(dTimeHours, 'g', 8)),
                    nFrameIndex);
    }
    m_pTimeCombo->blockSignals(bBlocked);
    m_sDisplayedTimePropertyId = bComplete ? sPropertyId : QString();
    m_nDisplayedTimeFrameCount = bComplete ? nFrameCount : -1;
}

void nmWxPebiResultControlBar::clearTimeItems()
{
    const bool bBlocked = m_pTimeCombo->blockSignals(true);
    m_pTimeCombo->clear();
    m_pTimeCombo->blockSignals(bBlocked);
    m_pTimeCombo->setEnabled(false);
    m_sDisplayedTimePropertyId.clear();
    m_nDisplayedTimeFrameCount = -1;
}

int nmWxPebiResultControlBar::findItemByData(
        QComboBox* pComboBox,
        const QVariant& oData) const
{
    if(pComboBox == nullptr) {
        return -1;
    }
    for(int nIndex = 0; nIndex < pComboBox->count(); ++nIndex) {
        if(pComboBox->itemData(nIndex) == oData) {
            return nIndex;
        }
    }
    return -1;
}