#include "nmWxPebiGridViewWidget.h"

#include "nmPebiGridSceneController.h"
#include "nmPebiGridViewData.h"

#include "nmVTKViewCommandController.h"
#include "nmWxVTKRenderContainerWidget.h"

#include <QAction>
#include <QComboBox>
#include <QCoreApplication>
#include <QHBoxLayout>
#include <QIcon>
#include <QLabel>
#include <QMenu>
#include <QSize>
#include <QToolBar>
#include <QVBoxLayout>
#include <QVariant>

namespace {

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

}

nmWxPebiGridViewWidget::nmWxPebiGridViewWidget(QWidget* pParent)
    : QWidget(pParent),
      m_pRenderContainer(NULL),
      m_pSceneController(NULL),
      m_pToolBar(NULL),
      m_pGridLinesAction(NULL),
      m_pScalarBarAction(NULL),
      m_pBoundsGridAction(NULL),
      m_pPropertyComboBox(NULL),
      m_pGridInfoLabel(NULL),
      m_pStatusLabel(NULL),
      m_bHasViewData(false)
{
    createUi();
    // 控制器必须在容器之后创建，以便使用当前实例独占的 Scene 和相机。
    m_pSceneController =
            new nmPebiGridSceneController(m_pRenderContainer);
    resetControls();
    setControlsEnabled(false);
    m_pRenderContainer->showEmptyState(tr("No grid data."));
}

nmWxPebiGridViewWidget::~nmWxPebiGridViewWidget()
{
    // 控制器先解除 Mapper 输入；Scene 和 Layer 随后由容器析构统一清理。
    delete m_pSceneController;
    m_pSceneController = NULL;
}

void nmWxPebiGridViewWidget::createUi()
{
    QVBoxLayout* pMainLayout = new QVBoxLayout(this);
    pMainLayout->setContentsMargins(0, 0, 0, 0);
    pMainLayout->setSpacing(0);

    // 绘图区单独使用水平布局，渲染容器伸展，竖向工具栏固定在右侧。
    QWidget* pRenderArea = new QWidget(this);
    QHBoxLayout* pRenderLayout = new QHBoxLayout(pRenderArea);
    pRenderLayout->setContentsMargins(0, 0, 0, 0);
    pRenderLayout->setSpacing(0);

    m_pRenderContainer = new nmWxVTKRenderContainerWidget(pRenderArea);
    m_pRenderContainer->setSizePolicy(
                QSizePolicy::Expanding, QSizePolicy::Expanding);
    m_pRenderContainer->setViewCommandCapabilities(
                nmVTKViewCommandController::ViewCommand_ZoomIn |
                nmVTKViewCommandController::ViewCommand_ZoomOut |
                nmVTKViewCommandController::ViewCommand_Fit |
                nmVTKViewCommandController::ViewCommand_Top |
                nmVTKViewCommandController::ViewCommand_SaveImage |
                nmVTKViewCommandController::ViewCommand_CopyImage |
                nmVTKViewCommandController::ViewCommand_Print |
                nmVTKViewCommandController::ViewCommand_PrintPreview);

    m_pToolBar = new QToolBar(pRenderArea);
    m_pToolBar->setOrientation(Qt::Vertical);
    m_pToolBar->setMovable(false);
    m_pToolBar->setFloatable(false);
    m_pToolBar->setIconSize(QSize(20, 20));
    m_pToolBar->setToolButtonStyle(Qt::ToolButtonIconOnly);
    m_pToolBar->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Expanding);

    nmVTKViewCommandController* pCommandController =
            m_pRenderContainer->getViewCommandController();

    // 三个业务 QAction 与公共命令一样长期持有，并同时用于工具栏和右键菜单。
    m_pGridLinesAction = new QAction(
                QIcon(gridViewIconPath("Grids.png")),
                tr("Show Grid Lines"), this);
    m_pGridLinesAction->setToolTip(tr("Show Grid Lines"));
    m_pGridLinesAction->setCheckable(true);
    m_pScalarBarAction = new QAction(
                QIcon(gridViewIconPath("Eyes.png")),
                tr("Show Scalar Bar"), this);
    m_pScalarBarAction->setToolTip(tr("Show Scalar Bar"));
    m_pScalarBarAction->setCheckable(true);
    m_pBoundsGridAction = new QAction(
                QIcon(gridViewIconPath("CalGrid.png")),
                tr("Coordinate Grid"), this);
    m_pBoundsGridAction->setToolTip(tr("Coordinate Grid"));
    m_pBoundsGridAction->setCheckable(true);

    if(pCommandController != NULL) {
        // 网格视图按自身工作流排序，但仍引用命令控制器持有的公共 QAction。
        QAction* pZoomOutAction = pCommandController->getAction(
                    nmVTKViewCommandController::ViewCommand_ZoomOut);
        QAction* pFitAction = pCommandController->getAction(
                    nmVTKViewCommandController::ViewCommand_Fit);
        QAction* pZoomInAction = pCommandController->getAction(
                    nmVTKViewCommandController::ViewCommand_ZoomIn);
        QAction* pTopAction = pCommandController->getAction(
                    nmVTKViewCommandController::ViewCommand_Top);
        QAction* pCopyAction = pCommandController->getAction(
                    nmVTKViewCommandController::ViewCommand_CopyImage);
        if(pZoomOutAction != NULL) {
            m_pToolBar->addAction(pZoomOutAction);
        }
        if(pFitAction != NULL) {
            m_pToolBar->addAction(pFitAction);
        }
        if(pZoomInAction != NULL) {
            m_pToolBar->addAction(pZoomInAction);
        }
        if(pTopAction != NULL) {
            m_pToolBar->addAction(pTopAction);
        }
        m_pToolBar->addSeparator();
        m_pToolBar->addAction(m_pGridLinesAction);
        m_pToolBar->addAction(m_pScalarBarAction);
        m_pToolBar->addAction(m_pBoundsGridAction);
        m_pToolBar->addSeparator();
        if(pCopyAction != NULL) {
            m_pToolBar->addAction(pCopyAction);
        }
    } else {
        // 理论上不会进入；仍保留业务动作，避免容器初始化异常时布局跳动。
        m_pToolBar->addAction(m_pGridLinesAction);
        m_pToolBar->addAction(m_pScalarBarAction);
        m_pToolBar->addAction(m_pBoundsGridAction);
    }

    pRenderLayout->addWidget(m_pRenderContainer, 1);
    pRenderLayout->addWidget(m_pToolBar);
    pMainLayout->addWidget(pRenderArea, 1);

    m_pStatusLabel = new QLabel(this);
    m_pStatusLabel->setWordWrap(true);
    m_pStatusLabel->setAlignment(Qt::AlignLeft | Qt::AlignVCenter);
    m_pStatusLabel->setStyleSheet(
                "QLabel { color: rgb(126, 76, 0); "
                "background-color: rgb(255, 244, 204); "
                "border-top: 1px solid rgb(220, 190, 105); "
                "padding: 4px 8px; }");
    m_pStatusLabel->hide();
    pMainLayout->addWidget(m_pStatusLabel);

    QWidget* pControlBar = new QWidget(this);
    QHBoxLayout* pControlLayout = new QHBoxLayout(pControlBar);
    pControlLayout->setContentsMargins(8, 5, 8, 5);
    pControlLayout->setSpacing(6);

    QLabel* pPropertyLabel = new QLabel(tr("Property:"), pControlBar);
    m_pPropertyComboBox = new QComboBox(pControlBar);
    m_pPropertyComboBox->setMinimumContentsLength(9);
    pControlLayout->addWidget(pPropertyLabel);
    pControlLayout->addWidget(m_pPropertyComboBox);
    pControlLayout->addStretch(1);

    m_pGridInfoLabel = new QLabel(pControlBar);
    m_pGridInfoLabel->setAlignment(Qt::AlignRight | Qt::AlignVCenter);
    pControlLayout->addWidget(m_pGridInfoLabel);
    pMainLayout->addWidget(pControlBar);

    connect(m_pPropertyComboBox, SIGNAL(currentIndexChanged(int)),
            this, SLOT(onPropertyChanged(int)));
    connect(m_pGridLinesAction, SIGNAL(toggled(bool)),
            this, SLOT(onGridLinesToggled(bool)));
    connect(m_pScalarBarAction, SIGNAL(toggled(bool)),
            this, SLOT(onScalarBarToggled(bool)));
    connect(m_pBoundsGridAction, SIGNAL(toggled(bool)),
            this, SLOT(onBoundsGridToggled(bool)));
    connect(m_pRenderContainer, SIGNAL(contextMenuAboutToShow(QMenu*)),
            this, SLOT(appendContextMenuActions(QMenu*)));
}

bool nmWxPebiGridViewWidget::setViewData(
        const nmPebiGridViewData& oViewData,
        QString* pError)
{
    if(m_pSceneController == NULL || !oViewData.isValid()) {
        if(pError != NULL) {
            *pError = tr("The grid preview data is invalid.");
        }
        return false;
    }
    if(!m_pSceneController->setViewData(oViewData, pError)) {
        // 控制器回滚失败时同步清除外层标志，避免把空场景误当作旧成功网格。
        m_bHasViewData = m_pSceneController->hasViewData();
        return false;
    }

    // 属性列表只登记 Builder 已确认与 CellData 单元数一致的 Material。
    const bool bOldBlockState = m_pPropertyComboBox->blockSignals(true);
    m_pPropertyComboBox->clear();
    m_pPropertyComboBox->addItem(tr("No property"), QString());
    if(oViewData.hasMaterial()) {
        m_pPropertyComboBox->addItem(tr("Material"), QString("Material"));
    }
    const QString sActiveProperty = m_pSceneController->getProperty();
    for(int nIndex = 0; nIndex < m_pPropertyComboBox->count(); ++nIndex) {
        if(m_pPropertyComboBox->itemData(nIndex).toString() ==
           sActiveProperty) {
            m_pPropertyComboBox->setCurrentIndex(nIndex);
            break;
        }
    }
    m_pPropertyComboBox->blockSignals(bOldBlockState);

    m_pGridInfoLabel->setText(
                tr("%1 cells | %2")
                .arg(static_cast<qlonglong>(
                         oViewData.getValidCellCount()))
                .arg(gridTypeText(static_cast<int>(oViewData.getGridType()))));
    m_pStatusLabel->hide();
    m_bHasViewData = true;
    setControlsEnabled(true);
    updateScalarBarActionState();
    return true;
}

void nmWxPebiGridViewWidget::showLoading()
{
    m_pStatusLabel->hide();
    setControlsEnabled(false);
    m_pRenderContainer->showRenderingState(tr("Generating grid..."));
}

void nmWxPebiGridViewWidget::showFailure(const QString& sMessage)
{
    if(m_bHasViewData) {
        // 失败时旧网格引用保持不变，状态条明确说明当前画面并非本次成果。
        m_pStatusLabel->setText(sMessage);
        m_pStatusLabel->show();
        setControlsEnabled(true);
        updateScalarBarActionState();
        m_pRenderContainer->showReadyState();
    } else {
        m_pStatusLabel->hide();
        setControlsEnabled(false);
        m_pRenderContainer->showErrorState(sMessage);
    }
}

void nmWxPebiGridViewWidget::clearView()
{
    if(m_pSceneController != NULL) {
        m_pSceneController->clear();
    }
    m_bHasViewData = false;
    m_pStatusLabel->hide();
    resetControls();
    setControlsEnabled(false);
    m_pRenderContainer->showEmptyState(tr("No grid data."));
}

bool nmWxPebiGridViewWidget::hasViewData() const
{
    return m_bHasViewData;
}

void nmWxPebiGridViewWidget::resetControls()
{
    bool bBlocked = m_pPropertyComboBox->blockSignals(true);
    m_pPropertyComboBox->clear();
    m_pPropertyComboBox->addItem(tr("No property"), QString());
    m_pPropertyComboBox->blockSignals(bBlocked);

    bBlocked = m_pGridLinesAction->blockSignals(true);
    m_pGridLinesAction->setChecked(true);
    m_pGridLinesAction->blockSignals(bBlocked);
    bBlocked = m_pScalarBarAction->blockSignals(true);
    m_pScalarBarAction->setChecked(true);
    m_pScalarBarAction->blockSignals(bBlocked);
    bBlocked = m_pBoundsGridAction->blockSignals(true);
    m_pBoundsGridAction->setChecked(false);
    m_pBoundsGridAction->blockSignals(bBlocked);
    m_pGridInfoLabel->setText(tr("0 cells | Unknown"));
}

void nmWxPebiGridViewWidget::setControlsEnabled(bool bEnabled)
{
    m_pPropertyComboBox->setEnabled(bEnabled);
    m_pGridLinesAction->setEnabled(bEnabled);
    m_pBoundsGridAction->setEnabled(bEnabled);
    m_pScalarBarAction->setEnabled(
                bEnabled && m_pSceneController != NULL &&
                !m_pSceneController->getProperty().isEmpty());
}

void nmWxPebiGridViewWidget::updateScalarBarActionState()
{
    if(m_pSceneController == NULL) {
        return;
    }
    const bool bBlocked = m_pScalarBarAction->blockSignals(true);
    m_pScalarBarAction->setChecked(
                m_pSceneController->isScalarBarVisible());
    m_pScalarBarAction->blockSignals(bBlocked);
    m_pScalarBarAction->setEnabled(
                m_bHasViewData &&
                !m_pSceneController->getProperty().isEmpty());
}

QString nmWxPebiGridViewWidget::gridTypeText(int nGridType) const
{
    return nGridType == static_cast<int>(NM_Grid_PEBI)
            ? QString("PEBI") : tr("Unknown");
}

void nmWxPebiGridViewWidget::onPropertyChanged(int nIndex)
{
    if(!m_bHasViewData || nIndex < 0 || m_pSceneController == NULL) {
        return;
    }
    const QString sPropertyName =
            m_pPropertyComboBox->itemData(nIndex).toString();
    if(!m_pSceneController->setProperty(sPropertyName)) {
        const bool bBlocked = m_pPropertyComboBox->blockSignals(true);
        m_pPropertyComboBox->setCurrentIndex(0);
        m_pPropertyComboBox->blockSignals(bBlocked);
    }
    updateScalarBarActionState();
}

void nmWxPebiGridViewWidget::onGridLinesToggled(bool bVisible)
{
    if(m_bHasViewData && m_pSceneController != NULL) {
        m_pSceneController->setGridLinesVisible(bVisible);
    }
}

void nmWxPebiGridViewWidget::onScalarBarToggled(bool bVisible)
{
    if(m_bHasViewData && m_pSceneController != NULL) {
        m_pSceneController->setScalarBarVisible(bVisible);
    }
}

void nmWxPebiGridViewWidget::onBoundsGridToggled(bool bVisible)
{
    if(m_bHasViewData && m_pSceneController != NULL) {
        m_pSceneController->setBoundsGridVisible(bVisible);
    }
}

void nmWxPebiGridViewWidget::appendContextMenuActions(QMenu* pMenu)
{
    if(pMenu == NULL) {
        return;
    }
    // 右键菜单与工具栏引用同三个业务 QAction，勾选状态不会发生分叉。
    pMenu->addAction(m_pGridLinesAction);
    pMenu->addAction(m_pScalarBarAction);
    pMenu->addAction(m_pBoundsGridAction);
}